.github/workflows/quality.yaml

@@ -1,7 +1,6 @@
 name: quality
 
 on:
-  workflow_call:
   pull_request:
     branches: [main]
   push:

.github/workflows/test.yaml

@@ -20,9 +20,3 @@ jobs:
       - uses: nvim-neorocks/nvim-busted-action@v1
         with:
           nvim_version: ${{ matrix.nvim }}
-          before: |
-            git clone --depth 1 https://github.com/the-mikedavis/tree-sitter-diff /tmp/ts-diff
-            cd /tmp/ts-diff && cc -shared -fPIC -o diff.so -I./src src/parser.c
-            mkdir -p ~/.local/share/nvim/site/parser ~/.local/share/nvim/site/queries/diff
-            cp diff.so ~/.local/share/nvim/site/parser/
-            cp queries/*.scm ~/.local/share/nvim/site/queries/diff/

.luarc.json

@@ -1,7 +1,7 @@
 {
   "runtime.version": "Lua 5.1",
   "runtime.path": ["lua/?.lua", "lua/?/init.lua"],
-  "diagnostics.globals": ["vim", "jit"],
+  "diagnostics.globals": ["vim"],
   "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
   "workspace.checkThirdParty": false,
   "completion.callSnippet": "Replace"

README.md

@@ -2,37 +2,36 @@
 
 **Syntax highlighting for diffs in Neovim**
 
-Enhance `vim-fugitive` and Neovim's built-in diff mode with language-aware
-syntax highlighting.
+Enhance vim-fugitive and Neovim's built-in diff mode with language-aware syntax
+highlighting.
 
 ![diffs.nvim preview](https://github.com/user-attachments/assets/d3d64c96-b824-4fcb-af7f-4aef3f7f498a)
 
 ## Features
 
 - Treesitter syntax highlighting in `:Git` diffs and commit views
-- Diff header highlighting (`diff --git`, `index`, `---`, `+++`)
 - `:Gdiffsplit` / `:Gvdiffsplit` syntax through diff backgrounds
-- `:Gdiff` unified diff against any git revision with syntax highlighting
-- Fugitive status buffer keymaps (`du`/`dU`) for unified diffs
 - Background-only diff colors for any `&diff` buffer (`:diffthis`, `vimdiff`)
 - Vim syntax fallback for languages without a treesitter parser
 - Hunk header context highlighting (`@@ ... @@ function foo()`)
-- Character-level (intra-line) diff highlighting for changed characters
-- Inline merge conflict detection, highlighting, and resolution keymaps
-- Configurable debouncing, max lines, diff prefix concealment, blend alpha, and
-  highlight overrides
+- Configurable debouncing, max lines, and diff prefix concealment
 
 ## Requirements
 
 - Neovim 0.9.0+
+- [vim-fugitive](https://github.com/tpope/vim-fugitive) (optional, for unified
+  diff syntax highlighting)
 
 ## Installation
 
-Install with your package manager of choice or via
-[luarocks](https://luarocks.org/modules/barrettruth/diffs.nvim):
+Using [lazy.nvim](https://github.com/folke/lazy.nvim):
 
-```
-luarocks install diffs.nvim
+```lua
+{
+  'barrettruth/diffs.nvim',
+  dependencies = { 'tpope/vim-fugitive' },
+  opts = {},
+}
 ```
 
 ## Documentation
@@ -41,40 +40,35 @@ luarocks install diffs.nvim
 :help diffs.nvim
 ```
 
+## Highlight Groups
+
+diffs.nvim defines the following highlight groups. All use `default = true`, so
+colorschemes can override them.
+
+| Group             | Purpose                                            |
+| ----------------- | -------------------------------------------------- |
+| `DiffsAdd`        | Background for `+` lines in fugitive unified diffs |
+| `DiffsDelete`     | Background for `-` lines in fugitive unified diffs |
+| `DiffsAddNr`      | Line number highlight for `+` lines                |
+| `DiffsDeleteNr`   | Line number highlight for `-` lines                |
+| `DiffsDiffAdd`    | Background-only `DiffAdd` for `&diff` windows      |
+| `DiffsDiffDelete` | Background-only `DiffDelete` for `&diff` windows   |
+| `DiffsDiffChange` | Background-only `DiffChange` for `&diff` windows   |
+| `DiffsDiffText`   | Background-only `DiffText` for `&diff` windows     |
+
+By default, these are computed from your colorscheme's `DiffAdd`, `DiffDelete`,
+`DiffChange`, `DiffText`, and `Normal` groups. To customize, define them in your
+colorscheme before diffs.nvim loads, or link them to existing groups.
+
 ## Known Limitations
 
-- **Incomplete syntax context**: Treesitter parses each diff hunk in isolation.
-  To improve accuracy, `diffs.nvim` reads lines from disk before and after each
-  hunk for parsing context (`highlights.context`, enabled by default with 25
-  lines). This resolves most boundary issues. Set
-  `highlights.context.enabled = false` to disable.
+- Syntax "flashing": diffs.nvim hooks into the `FileType fugitive` event
+  triggered by vim-fugitive, at which point the buffer is preliminarily painted.
+  The buffer is then re-painted after `debounce_ms` milliseconds, causing an
+  unavoidable visual "flash" even when `debounce_ms = 0`.
 
-- **Syntax flashing**: `diffs.nvim` hooks into the `FileType fugitive` event
-  triggered by `vim-fugitive`, at which point the buffer is preliminarily
-  painted. The buffer is then re-painted after `debounce_ms` milliseconds,
-  causing an unavoidable visual "flash" even when `debounce_ms = 0`.
+## Acknowledgements
 
-- **Conflicting diff plugins**: `diffs.nvim` may not interact well with other
-  plugins that modify diff highlighting. Known plugins that may conflict:
-  - [`diffview.nvim`](https://github.com/sindrets/diffview.nvim) - provides its
-    own diff highlighting and conflict resolution UI
-  - [`mini.diff`](https://github.com/echasnovski/mini.diff) - visualizes buffer
-    differences with its own highlighting system
-  - [`gitsigns.nvim`](https://github.com/lewis6991/gitsigns.nvim) - generally
-    compatible, but both plugins modifying line highlights may produce
-    unexpected results
-  - [`git-conflict.nvim`](https://github.com/akinsho/git-conflict.nvim) -
-    `diffs.nvim` now includes built-in conflict resolution; disable one or the
-    other to avoid overlap
-
-# Acknowledgements
-
-- [`vim-fugitive`](https://github.com/tpope/vim-fugitive)
-- [`codediff.nvim`](https://github.com/esmuellert/codediff.nvim)
-- [`diffview.nvim`](https://github.com/sindrets/diffview.nvim)
-- [`difftastic`](https://github.com/Wilfred/difftastic)
-- [`mini.diff`](https://github.com/echasnovski/mini.diff)
-- [`gitsigns.nvim`](https://github.com/lewis6991/gitsigns.nvim)
-- [`git-conflict.nvim`](https://github.com/akinsho/git-conflict.nvim)
-- [@phanen](https://github.com/phanen) - diff header highlighting, unknown
-  filetype fix, shebang/modeline detection, treesitter injection support
+- [vim-fugitive](https://github.com/tpope/vim-fugitive)
+- [codediff.nvim](https://github.com/esmuellert/codediff.nvim)
+- [diffview.nvim](https://github.com/sindrets/diffview.nvim)

doc/diffs.nvim.txt

@@ -12,15 +12,12 @@ built-in diff mode.
 
 Features: ~
 - Syntax highlighting in |:Git| summary diffs and commit detail views
-- Diff header highlighting (`diff --git`, `index`, `---`, `+++`)
 - Syntax highlighting in |:Gdiffsplit| / |:Gvdiffsplit| side-by-side diffs
-- |:Gdiff| command for unified diff against any git revision
 - Background-only diff colors for any `&diff` buffer (vimdiff, diffthis, etc.)
 - Vim syntax fallback for languages without a treesitter parser
 - Blended diff background colors that preserve syntax visibility
 - Optional diff prefix (`+`/`-`/` `) concealment
 - Gutter (line number) highlighting
-- Inline merge conflict marker detection, highlighting, and resolution
 
 ==============================================================================
 REQUIREMENTS                                              *diffs-requirements*
@@ -40,6 +37,7 @@ Using lazy.nvim: >lua
     {
       'barrettruth/diffs.nvim',
       dependencies = { 'tpope/vim-fugitive' },
+      opts = {},
     }
 <
 The plugin works automatically with no configuration required. For
@@ -48,56 +46,11 @@ customization, see |diffs-config|.
 ==============================================================================
 CONFIGURATION                                                   *diffs-config*
 
-Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
->lua
-    vim.g.diffs = {
-      debug = false,
-      debounce_ms = 0,
-      hide_prefix = false,
-      highlights = {
-        background = true,
-        gutter = true,
-        blend_alpha = 0.6,
-        context = {
-          enabled = true,
-          lines = 25,
-        },
-        treesitter = {
-          enabled = true,
-          max_lines = 500,
-        },
-        vim = {
-          enabled = false,
-          max_lines = 200,
-        },
-        intra = {
-          enabled = true,
-          algorithm = 'default',
-          max_lines = 500,
-        },
-        overrides = {},
-      },
-      fugitive = {
-        horizontal = 'du',
-        vertical = 'dU',
-      },
-      conflict = {
-        enabled = true,
-        disable_diagnostics = true,
-        show_virtual_text = true,
-        keymaps = {
-          ours = 'doo',
-          theirs = 'dot',
-          both = 'dob',
-          none = 'don',
-          next = ']x',
-          prev = '[x',
-        },
-      },
-    }
-<
                                                               *diffs.Config*
     Fields: ~
+        {enabled}            (boolean, default: true)
+                             Enable or disable highlighting globally.
+
         {debug}              (boolean, default: false)
                              Enable debug logging to |:messages| with
                              `[diffs]` prefix.
@@ -114,40 +67,6 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
                              is also enabled, the overlay inherits the line's
                              background color.
 
-        {highlights}         (table, default: see below)
-                             Controls which highlight features are enabled.
-                             See |diffs.Highlights| for fields.
-
-        {fugitive}           (table, default: see below)
-                             Fugitive status buffer keymap options.
-                             See |diffs.FugitiveConfig| for fields.
-
-        {conflict}           (table, default: see below)
-                             Inline merge conflict resolution options.
-                             See |diffs.ConflictConfig| for fields.
-
-                                                          *diffs.Highlights*
-    Highlights table fields: ~
-        {background}         (boolean, default: true)
-                             Apply background highlighting to `+`/`-` lines
-                             using `DiffsAdd`/`DiffsDelete` groups (derived
-                             from `DiffAdd`/`DiffDelete` backgrounds).
-
-        {gutter}             (boolean, default: true)
-                             Highlight line numbers with matching colors.
-                             Only visible if line numbers are enabled.
-
-        {blend_alpha}        (number, default: 0.6)
-                             Alpha value for character-level blend intensity.
-                             Controls how strongly changed characters stand
-                             out from the line-level background. Must be
-                             between 0 and 1 (inclusive). Higher values
-                             produce more vivid character-level highlights.
-
-        {context}            (table, default: see below)
-                             Syntax parsing context options.
-                             See |diffs.ContextConfig| for fields.
-
         {treesitter}         (table, default: see below)
                              Treesitter highlighting options.
                              See |diffs.TreesitterConfig| for fields.
@@ -156,30 +75,9 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
                              Vim syntax highlighting options (experimental).
                              See |diffs.VimConfig| for fields.
 
-        {intra}              (table, default: see below)
-                             Character-level (intra-line) diff highlighting.
-                             See |diffs.IntraConfig| for fields.
-
-        {overrides}          (table, default: {})
-                             Map of highlight group names to highlight
-                             definitions (see |nvim_set_hl()|). Applied
-                             after all computed groups without `default`,
-                             so overrides always win over both computed
-                             defaults and colorscheme definitions.
-
-                                                      *diffs.ContextConfig*
-    Context config fields: ~
-        {enabled}            (boolean, default: true)
-                             Read lines from disk before and after each hunk
-                             to provide surrounding syntax context. Improves
-                             accuracy at hunk boundaries where incomplete
-                             constructs (e.g., a function definition with no
-                             body) would otherwise confuse the parser.
-
-        {lines}              (integer, default: 25)
-                             Number of context lines to read in each
-                             direction. Lines are read with early exit —
-                             cost scales with this value, not file size.
+        {highlights}         (table, default: see below)
+                             Controls which highlight features are enabled.
+                             See |diffs.Highlights| for fields.
 
                                                     *diffs.TreesitterConfig*
     Treesitter config fields: ~
@@ -205,25 +103,16 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
                              this many lines. Lower than the treesitter default
                              due to the per-character cost of |synID()|.
 
-                                                        *diffs.IntraConfig*
-    Intra config fields: ~
-        {enabled}            (boolean, default: true)
-                             Enable character-level diff highlighting within
-                             changed lines. When a line changes from `local x = 1`
-                             to `local x = 2`, only the `1`/`2` characters get
-                             an intense background overlay while the rest of the
-                             line keeps the softer line-level background.
+                                                          *diffs.Highlights*
+    Highlights table fields: ~
+        {background}         (boolean, default: true)
+                             Apply background highlighting to `+`/`-` lines
+                             using `DiffsAdd`/`DiffsDelete` groups (derived
+                             from `DiffAdd`/`DiffDelete` backgrounds).
 
-        {algorithm}          (string, default: 'default')
-                             Diff algorithm for character-level analysis.
-                             `'default'`: use |vim.diff()| with settings
-                             inherited from |'diffopt'| (`algorithm` and
-                             `linematch`). `'vscode'`: use libvscodediff FFI
-                             (falls back to default if not available).
-
-        {max_lines}          (integer, default: 500)
-                             Skip character-level highlighting for hunks larger
-                             than this many lines.
+        {gutter}             (boolean, default: true)
+                             Highlight line numbers with matching colors.
+                             Only visible if line numbers are enabled.
 
     Note: Header context (e.g., `@@ -10,3 +10,4 @@ func()`) is always
     highlighted with treesitter when a parser is available.
@@ -234,232 +123,13 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
     |vim.filetype.add()| and |vim.treesitter.language.register()|.
 
 ==============================================================================
-COMMANDS                                                      *diffs-commands*
+API                                                                *diffs-api*
 
-:Gdiff [revision]                                                    *:Gdiff*
-    Open a unified diff of the current file against a git revision. Displays
-    in a horizontal split below the current window.
-
-    The diff buffer shows `+`/`-` lines with full syntax highlighting for the
-    code language, plus diff header highlighting for `diff --git`, `---`,
-    `+++`, and `@@` lines.
-
-    If a `diffs://` window already exists in the current tabpage, the new
-    diff replaces its buffer instead of creating another split.
+setup({opts})                                               *diffs.setup()*
+    Configure the plugin with `opts`.
 
     Parameters: ~
-        {revision}  (string, optional) Git revision to diff against.
-                    Defaults to HEAD.
-
-    Examples: >vim
-        :Gdiff          " diff against HEAD
-        :Gdiff main     " diff against main branch
-        :Gdiff HEAD~3   " diff against 3 commits ago
-        :Gdiff abc123   " diff against specific commit
-<
-
-:Gvdiff [revision]                                                  *:Gvdiff*
-    Like |:Gdiff| but opens in a vertical split.
-
-:Ghdiff [revision]                                                  *:Ghdiff*
-    Like |:Gdiff| but explicitly opens in a horizontal split.
-
-==============================================================================
-MAPPINGS                                                     *diffs-mappings*
-
-                                                        *<Plug>(diffs-gdiff)*
-<Plug>(diffs-gdiff)     Show unified diff against HEAD in a horizontal
-                        split. Equivalent to |:Gdiff| with no arguments.
-
-                                                       *<Plug>(diffs-gvdiff)*
-<Plug>(diffs-gvdiff)    Show unified diff against HEAD in a vertical
-                        split. Equivalent to |:Gvdiff| with no arguments.
-
-Example configuration: >lua
-    vim.keymap.set('n', '<leader>gd', '<Plug>(diffs-gdiff)')
-    vim.keymap.set('n', '<leader>gD', '<Plug>(diffs-gvdiff)')
-<
-
-                                              *<Plug>(diffs-conflict-ours)*
-<Plug>(diffs-conflict-ours)
-                        Accept current (ours) change. Replaces the
-                        conflict block with ours content.
-
-                                            *<Plug>(diffs-conflict-theirs)*
-<Plug>(diffs-conflict-theirs)
-                        Accept incoming (theirs) change. Replaces the
-                        conflict block with theirs content.
-
-                                              *<Plug>(diffs-conflict-both)*
-<Plug>(diffs-conflict-both)
-                        Accept both changes (ours then theirs).
-
-                                              *<Plug>(diffs-conflict-none)*
-<Plug>(diffs-conflict-none)
-                        Reject both changes (delete entire block).
-
-                                              *<Plug>(diffs-conflict-next)*
-<Plug>(diffs-conflict-next)
-                        Jump to next conflict marker. Wraps around.
-
-                                              *<Plug>(diffs-conflict-prev)*
-<Plug>(diffs-conflict-prev)
-                        Jump to previous conflict marker. Wraps around.
-
-Example configuration: >lua
-    vim.keymap.set('n', 'co', '<Plug>(diffs-conflict-ours)')
-    vim.keymap.set('n', 'ct', '<Plug>(diffs-conflict-theirs)')
-    vim.keymap.set('n', 'cb', '<Plug>(diffs-conflict-both)')
-    vim.keymap.set('n', 'cn', '<Plug>(diffs-conflict-none)')
-    vim.keymap.set('n', ']x', '<Plug>(diffs-conflict-next)')
-    vim.keymap.set('n', '[x', '<Plug>(diffs-conflict-prev)')
-<
-
-Diff buffer mappings: ~
-                                                              *diffs-q*
-    q               Close the diff window. Available in all `diffs://`
-                    buffers created by |:Gdiff|, |:Gvdiff|, |:Ghdiff|,
-                    or the fugitive status keymaps.
-
-==============================================================================
-FUGITIVE STATUS KEYMAPS                                   *diffs-fugitive*
-
-When inside a vim-fugitive |:Git| status buffer, diffs.nvim provides keymaps
-to open unified diffs for files or entire sections.
-
-Keymaps: ~
-                                                          *diffs-du* *diffs-dU*
-    du          Open unified diff in a horizontal split.
-    dU          Open unified diff in a vertical split.
-
-These keymaps work on:
-- File lines (e.g., `M  src/foo.lua`) - opens diff for that file
-- Section headers (e.g., `Staged (3)`) - opens diff for all files in section
-- Hunk/context lines below a file - opens diff for the parent file
-
-Behavior by file status: ~
-
-    Status      Section     Base            Current         Result ~
-    M           Unstaged    index           working tree    unstaged changes
-    M           Staged      HEAD            index           staged changes
-    A           Staged      (empty)         index           file as all-added
-    D           Staged      HEAD            (empty)         file as all-removed
-    R           Staged      HEAD:oldname    index:newname   content diff
-    ?           Untracked   (empty)         working tree    file as all-added
-
-On section headers, the keymap runs `git diff` (or `git diff --cached` for
-staged) and displays all changes in that section as a single unified diff.
-Untracked section headers show a warning since there is no meaningful diff.
-
-Configuration: ~
-                                                      *diffs.FugitiveConfig*
->lua
-    vim.g.diffs = {
-      fugitive = {
-        horizontal = 'du',  -- keymap for horizontal split, false to disable
-        vertical = 'dU',    -- keymap for vertical split, false to disable
-      },
-    }
-<
-    Fields: ~
-        {horizontal}         (string|false, default: 'du')
-                             Keymap for unified diff in horizontal split.
-                             Set to `false` to disable.
-
-        {vertical}           (string|false, default: 'dU')
-                             Keymap for unified diff in vertical split.
-                             Set to `false` to disable.
-
-==============================================================================
-CONFLICT RESOLUTION                                          *diffs-conflict*
-
-diffs.nvim detects inline merge conflict markers (`<<<<<<<`/`=======`/
-`>>>>>>>`) in working files and provides highlighting and resolution keymaps.
-Both standard and diff3 (`|||||||`) formats are supported.
-
-Conflict regions are detected automatically on `BufReadPost` and re-scanned
-on `TextChanged`. When all conflicts in a buffer are resolved, highlighting
-is removed and diagnostics are re-enabled.
-
-Configuration: ~
-                                                      *diffs.ConflictConfig*
->lua
-    vim.g.diffs = {
-      conflict = {
-        enabled = true,
-        disable_diagnostics = true,
-        show_virtual_text = true,
-        keymaps = {
-          ours = 'doo',
-          theirs = 'dot',
-          both = 'dob',
-          none = 'don',
-          next = ']x',
-          prev = '[x',
-        },
-      },
-    }
-<
-    Fields: ~
-        {enabled}            (boolean, default: true)
-                             Enable conflict marker detection and
-                             resolution. Set to `false` to disable
-                             entirely.
-
-        {disable_diagnostics} (boolean, default: true)
-                             Suppress LSP diagnostics on buffers with
-                             conflict markers. Markers produce syntax
-                             errors that clutter the diagnostic list.
-                             Diagnostics are re-enabled when all conflicts
-                             are resolved. Set `false` to leave
-                             diagnostics alone.
-
-        {show_virtual_text}  (boolean, default: true)
-                             Show virtual text labels (" current" and
-                             " incoming") at the end of `<<<<<<<` and
-                             `>>>>>>>` marker lines.
-
-        {keymaps}            (table, default: see above)
-                             Buffer-local keymaps for conflict resolution
-                             and navigation. Each value accepts a string
-                             (custom key) or `false` (disabled).
-
-                                                  *diffs.ConflictKeymaps*
-    Keymap fields: ~
-        {ours}               (string|false, default: 'doo')
-                             Accept current (ours) change.
-
-        {theirs}             (string|false, default: 'dot')
-                             Accept incoming (theirs) change.
-
-        {both}               (string|false, default: 'dob')
-                             Accept both changes (ours then theirs).
-
-        {none}               (string|false, default: 'don')
-                             Reject both changes (delete entire block).
-
-        {next}               (string|false, default: ']x')
-                             Jump to next conflict marker. Wraps around.
-
-        {prev}               (string|false, default: '[x')
-                             Jump to previous conflict marker. Wraps
-                             around.
-
-User events: ~
-                                                   *DiffsConflictResolved*
-    DiffsConflictResolved   Fired when the last conflict in a buffer is
-                            resolved. Useful for triggering custom actions
-                            (e.g., auto-staging the file). >lua
-                                vim.api.nvim_create_autocmd('User', {
-                                  pattern = 'DiffsConflictResolved',
-                                  callback = function()
-                                    print('all conflicts resolved!')
-                                  end,
-                                })
-<
-
-==============================================================================
-API                                                                *diffs-api*
+        {opts}  (|diffs.Config|, optional) Configuration table.
 
 attach({bufnr})                                             *diffs.attach()*
     Manually attach highlighting to a buffer. Called automatically for
@@ -489,11 +159,9 @@ Summary / commit detail views: ~
    - Code is parsed with |vim.treesitter.get_string_parser()|
    - If no treesitter parser and `vim.enabled`: vim syntax fallback via
      scratch buffer and |synID()|
-   - `Normal` extmarks at priority 198 clear underlying diff foreground
-   - Background extmarks (`DiffsAdd`/`DiffsDelete`) at priority 199
+   - Background extmarks (`DiffsAdd`/`DiffsDelete`) at priority 198
+   - `Normal` extmarks at priority 199 clear underlying diff foreground
    - Syntax highlights are applied as extmarks at priority 200
-   - Character-level diff extmarks (`DiffsAddText`/`DiffsDeleteText`) at
-     priority 201 overlay changed characters with an intense background
    - Conceal extmarks hide diff prefixes when `hide_prefix` is enabled
 4. Re-highlighting occurs on `TextChanged` (debounced) and `Syntax` events
 
@@ -507,18 +175,6 @@ Diff mode views: ~
 ==============================================================================
 KNOWN LIMITATIONS                                       *diffs-limitations*
 
-Incomplete Syntax Context ~
-                                                      *diffs-syntax-context*
-Treesitter parses each diff hunk in isolation. To provide surrounding code
-context, diffs.nvim reads lines from disk before and after each hunk
-(see |diffs.ContextConfig|, enabled by default). This resolves most boundary
-issues where incomplete constructs (e.g., a function definition at the edge
-of a hunk with no body) would confuse the parser.
-
-Set `highlights.context.enabled = false` to disable context padding. In rare
-cases, context padding may not help if the relevant surrounding code is very
-far from the hunk boundaries.
-
 Syntax Highlighting Flash ~
                                                              *diffs-flash*
 When opening a fugitive buffer, there is an unavoidable visual "flash" where
@@ -530,50 +186,16 @@ which fires after vim-fugitive has already painted the buffer. Even with
 `debounce_ms = 0`, the re-painting goes through Neovim's event loop.
 
 To minimize the flash, use a low debounce value: >lua
-    vim.g.diffs = {
+    require('diffs').setup({
       debounce_ms = 0,
-    }
+    })
 <
 
-Conflicting Diff Plugins ~
-                                                    *diffs-plugin-conflicts*
-diffs.nvim may not interact well with other plugins that modify diff
-highlighting or the sign column in diff views. Known plugins that may
-conflict:
-
-  - diffview.nvim (sindrets/diffview.nvim)
-      Provides its own diff highlighting and conflict resolution UI.
-      When using diffview.nvim for viewing diffs, you may want to disable
-      diffs.nvim's diff mode attachment or use one plugin exclusively.
-
-  - mini.diff (echasnovski/mini.diff)
-      Visualizes buffer differences with its own highlighting system.
-      May override or conflict with diffs.nvim's background highlighting.
-
-  - gitsigns.nvim (lewis6991/gitsigns.nvim)
-      Generally compatible for sign column decorations, but both plugins
-      modifying line highlights may produce unexpected results.
-
-  - git-conflict.nvim (akinsho/git-conflict.nvim)
-      Provides conflict marker highlighting and resolution keymaps.
-      diffs.nvim now has built-in conflict resolution (see
-      |diffs-conflict|). Disable one or the other to avoid overlap.
-
-If you experience visual conflicts, try disabling the conflicting plugin's
-diff-related features.
-
 ==============================================================================
 HIGHLIGHT GROUPS                                          *diffs-highlights*
 
-diffs.nvim defines custom highlight groups. All groups use `default = true`,
-so colorschemes can override them by defining the group before the plugin
-loads.
-
-All derived groups are computed by alpha-blending a source color into the
-`Normal` background. Line-level groups blend at 40% alpha for a subtle tint;
-character-level groups blend at 60% for more contrast. Line-number groups
-combine both: background from the line-level blend, foreground from the
-character-level blend.
+diffs.nvim defines custom highlight groups. All are set with `default = true`,
+so colorschemes can override them by defining them first.
 
 Fugitive unified diff highlights: ~
                                                                   *DiffsAdd*
@@ -586,89 +208,32 @@ Fugitive unified diff highlights: ~
 
                                                                 *DiffsAddNr*
     DiffsAddNr          Line number for `+` lines. Foreground from
-                        `DiffsAddText`, background from `DiffsAdd`.
+                        `diffAdded`, background from `DiffsAdd`.
 
                                                              *DiffsDeleteNr*
     DiffsDeleteNr       Line number for `-` lines. Foreground from
-                        `DiffsDeleteText`, background from `DiffsDelete`.
-
-                                                              *DiffsAddText*
-    DiffsAddText        Character-level background for changed characters
-                        within `+` lines. Derived by blending `diffAdded`
-                        foreground with `Normal` background at 60% alpha.
-                        Only sets `bg`, so treesitter foreground colors show
-                        through.
-
-                                                           *DiffsDeleteText*
-    DiffsDeleteText     Character-level background for changed characters
-                        within `-` lines. Derived by blending `diffRemoved`
-                        foreground with `Normal` background at 60% alpha.
-
-Conflict highlights: ~
-                                                        *DiffsConflictOurs*
-    DiffsConflictOurs   Background for "ours" (current) content lines.
-                        Derived by blending `DiffAdd` background with
-                        `Normal` at 40% alpha (green tint).
-
-                                                      *DiffsConflictTheirs*
-    DiffsConflictTheirs Background for "theirs" (incoming) content lines.
-                        Derived by blending `DiffChange` background with
-                        `Normal` at 40% alpha.
-
-                                                        *DiffsConflictBase*
-    DiffsConflictBase   Background for base (ancestor) content lines in
-                        diff3 conflicts. Derived by blending `DiffText`
-                        background with `Normal` at 30% alpha (muted).
-
-                                                      *DiffsConflictMarker*
-    DiffsConflictMarker Dimmed foreground with bold for `<<<<<<<`,
-                        `=======`, `>>>>>>>`, and `|||||||` marker lines.
-
-                                                      *DiffsConflictOursNr*
-    DiffsConflictOursNr Line number for "ours" content lines. Foreground
-                        from higher-alpha blend, background from line-level
-                        blend.
-
-                                                    *DiffsConflictTheirsNr*
-    DiffsConflictTheirsNr Line number for "theirs" content lines.
-
-                                                      *DiffsConflictBaseNr*
-    DiffsConflictBaseNr Line number for base content lines (diff3).
+                        `diffRemoved`, background from `DiffsDelete`.
 
 Diff mode window highlights: ~
-These are used for |winhighlight| remapping in `&diff` windows.
+These are background-only variants used for |winhighlight| remapping in
+`&diff` windows, allowing treesitter syntax to show through.
 
                                                              *DiffsDiffAdd*
-    DiffsDiffAdd        Background-only. Derived from `DiffAdd` bg.
-                        Treesitter provides foreground syntax highlighting.
+    DiffsDiffAdd        Background-only version of `DiffAdd`.
 
                                                           *DiffsDiffDelete*
-    DiffsDiffDelete     Foreground and background from `DiffDelete`.
-                        Used for filler lines (`/////`) which have no real
-                        code content to highlight.
+    DiffsDiffDelete     Background-only version of `DiffDelete`.
 
                                                           *DiffsDiffChange*
-    DiffsDiffChange     Background-only. Derived from `DiffChange` bg.
-                        Treesitter provides foreground syntax highlighting.
+    DiffsDiffChange     Background-only version of `DiffChange`.
 
                                                             *DiffsDiffText*
-    DiffsDiffText       Background-only. Derived from `DiffText` bg.
-                        Treesitter provides foreground syntax highlighting.
+    DiffsDiffText       Background-only version of `DiffText`.
 
 To customize these in your colorscheme: >lua
     vim.api.nvim_set_hl(0, 'DiffsAdd', { bg = '#2e4a3a' })
     vim.api.nvim_set_hl(0, 'DiffsDiffDelete', { link = 'DiffDelete' })
 <
-Or via `highlights.overrides` in config: >lua
-    vim.g.diffs = {
-      highlights = {
-        overrides = {
-          DiffsAdd = { bg = '#2e4a3a' },
-          DiffsDiffDelete = { link = 'DiffDelete' },
-        },
-      },
-    }
-<
 
 ==============================================================================
 HEALTH CHECK                                                 *diffs-health*
@@ -678,16 +243,6 @@ Run |:checkhealth| diffs to verify your setup.
 Checks performed:
 - Neovim version >= 0.9.0
 - vim-fugitive is installed (optional)
-- libvscode_diff shared library is available (optional)
-
-==============================================================================
-ACKNOWLEDGEMENTS                                     *diffs-acknowledgements*
-
-- vim-fugitive (https://github.com/tpope/vim-fugitive)
-- codediff.nvim (https://github.com/esmuellert/codediff.nvim)
-- diffview.nvim (https://github.com/sindrets/diffview.nvim)
-- @phanen (https://github.com/phanen) - diff header highlighting,
-  treesitter injection support
 
 ==============================================================================
  vim:tw=78:ts=8:ft=help:norl:

lua/diffs/commands.lua

@@ -1,393 +0,0 @@
-local M = {}
-
-local git = require('diffs.git')
-local dbg = require('diffs.log').dbg
-
----@return integer?
-function M.find_diffs_window()
-  local tabpage = vim.api.nvim_get_current_tabpage()
-  for _, win in ipairs(vim.api.nvim_tabpage_list_wins(tabpage)) do
-    if vim.api.nvim_win_is_valid(win) then
-      local buf = vim.api.nvim_win_get_buf(win)
-      local name = vim.api.nvim_buf_get_name(buf)
-      if name:match('^diffs://') then
-        return win
-      end
-    end
-  end
-  return nil
-end
-
----@param bufnr integer
-function M.setup_diff_buf(bufnr)
-  vim.diagnostic.enable(false, { bufnr = bufnr })
-  vim.keymap.set('n', 'q', '<cmd>close<CR>', { buffer = bufnr })
-end
-
----@param diff_lines string[]
----@param hunk_position { hunk_header: string, offset: integer }
----@return integer?
-function M.find_hunk_line(diff_lines, hunk_position)
-  for i, line in ipairs(diff_lines) do
-    if line == hunk_position.hunk_header then
-      return i + hunk_position.offset
-    end
-  end
-  return nil
-end
-
----@param old_lines string[]
----@param new_lines string[]
----@param old_name string
----@param new_name string
----@return string[]
-local function generate_unified_diff(old_lines, new_lines, old_name, new_name)
-  local old_content = table.concat(old_lines, '\n')
-  local new_content = table.concat(new_lines, '\n')
-
-  local diff_fn = vim.text and vim.text.diff or vim.diff
-  local diff_output = diff_fn(old_content, new_content, {
-    result_type = 'unified',
-    ctxlen = 3,
-  })
-
-  if not diff_output or diff_output == '' then
-    return {}
-  end
-
-  local diff_lines = vim.split(diff_output, '\n', { plain = true })
-
-  local result = {
-    'diff --git a/' .. old_name .. ' b/' .. new_name,
-    '--- a/' .. old_name,
-    '+++ b/' .. new_name,
-  }
-  for _, line in ipairs(diff_lines) do
-    table.insert(result, line)
-  end
-
-  return result
-end
-
----@param revision? string
----@param vertical? boolean
-function M.gdiff(revision, vertical)
-  revision = revision or 'HEAD'
-
-  local bufnr = vim.api.nvim_get_current_buf()
-  local filepath = vim.api.nvim_buf_get_name(bufnr)
-
-  if filepath == '' then
-    vim.notify('[diffs.nvim]: cannot diff unnamed buffer', vim.log.levels.ERROR)
-    return
-  end
-
-  local rel_path = git.get_relative_path(filepath)
-  if not rel_path then
-    vim.notify('[diffs.nvim]: not in a git repository', vim.log.levels.ERROR)
-    return
-  end
-
-  local old_lines, err = git.get_file_content(revision, filepath)
-  if not old_lines then
-    vim.notify('[diffs.nvim]: ' .. (err or 'unknown error'), vim.log.levels.ERROR)
-    return
-  end
-
-  local new_lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-
-  local diff_lines = generate_unified_diff(old_lines, new_lines, rel_path, rel_path)
-
-  if #diff_lines == 0 then
-    vim.notify('[diffs.nvim]: no diff against ' .. revision, vim.log.levels.INFO)
-    return
-  end
-
-  local repo_root = git.get_repo_root(filepath)
-
-  local diff_buf = vim.api.nvim_create_buf(false, true)
-  vim.api.nvim_buf_set_lines(diff_buf, 0, -1, false, diff_lines)
-  vim.api.nvim_set_option_value('buftype', 'nowrite', { buf = diff_buf })
-  vim.api.nvim_set_option_value('bufhidden', 'delete', { buf = diff_buf })
-  vim.api.nvim_set_option_value('swapfile', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('modifiable', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('filetype', 'diff', { buf = diff_buf })
-  vim.api.nvim_buf_set_name(diff_buf, 'diffs://' .. revision .. ':' .. rel_path)
-  if repo_root then
-    vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-  end
-
-  local existing_win = M.find_diffs_window()
-  if existing_win then
-    vim.api.nvim_set_current_win(existing_win)
-    vim.api.nvim_win_set_buf(existing_win, diff_buf)
-  else
-    vim.cmd(vertical and 'vsplit' or 'split')
-    vim.api.nvim_win_set_buf(0, diff_buf)
-  end
-
-  M.setup_diff_buf(diff_buf)
-  dbg('opened diff buffer %d for %s against %s', diff_buf, rel_path, revision)
-
-  vim.schedule(function()
-    require('diffs').attach(diff_buf)
-  end)
-end
-
----@class diffs.GdiffFileOpts
----@field vertical? boolean
----@field staged? boolean
----@field untracked? boolean
----@field old_filepath? string
----@field hunk_position? { hunk_header: string, offset: integer }
-
----@param filepath string
----@param opts? diffs.GdiffFileOpts
-function M.gdiff_file(filepath, opts)
-  opts = opts or {}
-
-  local rel_path = git.get_relative_path(filepath)
-  if not rel_path then
-    vim.notify('[diffs.nvim]: not in a git repository', vim.log.levels.ERROR)
-    return
-  end
-
-  local old_rel_path = opts.old_filepath and git.get_relative_path(opts.old_filepath) or rel_path
-
-  local old_lines, new_lines, err
-  local diff_label
-
-  if opts.untracked then
-    old_lines = {}
-    new_lines, err = git.get_working_content(filepath)
-    if not new_lines then
-      vim.notify('[diffs.nvim]: ' .. (err or 'cannot read file'), vim.log.levels.ERROR)
-      return
-    end
-    diff_label = 'untracked'
-  elseif opts.staged then
-    old_lines, err = git.get_file_content('HEAD', opts.old_filepath or filepath)
-    if not old_lines then
-      old_lines = {}
-    end
-    new_lines, err = git.get_index_content(filepath)
-    if not new_lines then
-      new_lines = {}
-    end
-    diff_label = 'staged'
-  else
-    old_lines, err = git.get_index_content(opts.old_filepath or filepath)
-    if not old_lines then
-      old_lines, err = git.get_file_content('HEAD', opts.old_filepath or filepath)
-      if not old_lines then
-        old_lines = {}
-        diff_label = 'untracked'
-      else
-        diff_label = 'unstaged'
-      end
-    else
-      diff_label = 'unstaged'
-    end
-    new_lines, err = git.get_working_content(filepath)
-    if not new_lines then
-      new_lines = {}
-    end
-  end
-
-  local diff_lines = generate_unified_diff(old_lines, new_lines, old_rel_path, rel_path)
-
-  if #diff_lines == 0 then
-    vim.notify('[diffs.nvim]: no changes', vim.log.levels.INFO)
-    return
-  end
-
-  local repo_root = git.get_repo_root(filepath)
-
-  local diff_buf = vim.api.nvim_create_buf(false, true)
-  vim.api.nvim_buf_set_lines(diff_buf, 0, -1, false, diff_lines)
-  vim.api.nvim_set_option_value('buftype', 'nowrite', { buf = diff_buf })
-  vim.api.nvim_set_option_value('bufhidden', 'delete', { buf = diff_buf })
-  vim.api.nvim_set_option_value('swapfile', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('modifiable', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('filetype', 'diff', { buf = diff_buf })
-  vim.api.nvim_buf_set_name(diff_buf, 'diffs://' .. diff_label .. ':' .. rel_path)
-  if repo_root then
-    vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-  end
-  if old_rel_path ~= rel_path then
-    vim.api.nvim_buf_set_var(diff_buf, 'diffs_old_filepath', old_rel_path)
-  end
-
-  local existing_win = M.find_diffs_window()
-  if existing_win then
-    vim.api.nvim_set_current_win(existing_win)
-    vim.api.nvim_win_set_buf(existing_win, diff_buf)
-  else
-    vim.cmd(opts.vertical and 'vsplit' or 'split')
-    vim.api.nvim_win_set_buf(0, diff_buf)
-  end
-
-  if opts.hunk_position then
-    local target_line = M.find_hunk_line(diff_lines, opts.hunk_position)
-    if target_line then
-      vim.api.nvim_win_set_cursor(0, { target_line, 0 })
-      dbg('jumped to line %d for hunk', target_line)
-    end
-  end
-
-  M.setup_diff_buf(diff_buf)
-  dbg('opened diff buffer %d for %s (%s)', diff_buf, rel_path, diff_label)
-
-  vim.schedule(function()
-    require('diffs').attach(diff_buf)
-  end)
-end
-
----@class diffs.GdiffSectionOpts
----@field vertical? boolean
----@field staged? boolean
-
----@param repo_root string
----@param opts? diffs.GdiffSectionOpts
-function M.gdiff_section(repo_root, opts)
-  opts = opts or {}
-
-  local cmd = { 'git', '-C', repo_root, 'diff', '--no-ext-diff', '--no-color' }
-  if opts.staged then
-    table.insert(cmd, '--cached')
-  end
-
-  local result = vim.fn.systemlist(cmd)
-  if vim.v.shell_error ~= 0 then
-    vim.notify('[diffs.nvim]: git diff failed', vim.log.levels.ERROR)
-    return
-  end
-
-  if #result == 0 then
-    vim.notify('[diffs.nvim]: no changes in section', vim.log.levels.INFO)
-    return
-  end
-
-  local diff_label = opts.staged and 'staged' or 'unstaged'
-  local diff_buf = vim.api.nvim_create_buf(false, true)
-  vim.api.nvim_buf_set_lines(diff_buf, 0, -1, false, result)
-  vim.api.nvim_set_option_value('buftype', 'nowrite', { buf = diff_buf })
-  vim.api.nvim_set_option_value('bufhidden', 'delete', { buf = diff_buf })
-  vim.api.nvim_set_option_value('swapfile', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('modifiable', false, { buf = diff_buf })
-  vim.api.nvim_set_option_value('filetype', 'diff', { buf = diff_buf })
-  vim.api.nvim_buf_set_name(diff_buf, 'diffs://' .. diff_label .. ':all')
-  vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-
-  local existing_win = M.find_diffs_window()
-  if existing_win then
-    vim.api.nvim_set_current_win(existing_win)
-    vim.api.nvim_win_set_buf(existing_win, diff_buf)
-  else
-    vim.cmd(opts.vertical and 'vsplit' or 'split')
-    vim.api.nvim_win_set_buf(0, diff_buf)
-  end
-
-  M.setup_diff_buf(diff_buf)
-  dbg('opened section diff buffer %d (%s)', diff_buf, diff_label)
-
-  vim.schedule(function()
-    require('diffs').attach(diff_buf)
-  end)
-end
-
----@param bufnr integer
-function M.read_buffer(bufnr)
-  local name = vim.api.nvim_buf_get_name(bufnr)
-  local url_body = name:match('^diffs://(.+)$')
-  if not url_body then
-    return
-  end
-
-  local label, path = url_body:match('^([^:]+):(.+)$')
-  if not label or not path then
-    return
-  end
-
-  local ok, repo_root = pcall(vim.api.nvim_buf_get_var, bufnr, 'diffs_repo_root')
-  if not ok or not repo_root then
-    return
-  end
-
-  local diff_lines
-
-  if path == 'all' then
-    local cmd = { 'git', '-C', repo_root, 'diff', '--no-ext-diff', '--no-color' }
-    if label == 'staged' then
-      table.insert(cmd, '--cached')
-    end
-    diff_lines = vim.fn.systemlist(cmd)
-    if vim.v.shell_error ~= 0 then
-      diff_lines = {}
-    end
-  else
-    local abs_path = repo_root .. '/' .. path
-
-    local old_ok, old_rel_path = pcall(vim.api.nvim_buf_get_var, bufnr, 'diffs_old_filepath')
-    local old_abs_path = old_ok and old_rel_path and (repo_root .. '/' .. old_rel_path) or abs_path
-    local old_name = old_ok and old_rel_path or path
-
-    local old_lines, new_lines
-
-    if label == 'untracked' then
-      old_lines = {}
-      new_lines = git.get_working_content(abs_path) or {}
-    elseif label == 'staged' then
-      old_lines = git.get_file_content('HEAD', old_abs_path) or {}
-      new_lines = git.get_index_content(abs_path) or {}
-    elseif label == 'unstaged' then
-      old_lines = git.get_index_content(old_abs_path)
-      if not old_lines then
-        old_lines = git.get_file_content('HEAD', old_abs_path) or {}
-      end
-      new_lines = git.get_working_content(abs_path) or {}
-    else
-      old_lines = git.get_file_content(label, abs_path) or {}
-      new_lines = git.get_working_content(abs_path) or {}
-    end
-
-    diff_lines = generate_unified_diff(old_lines, new_lines, old_name, path)
-  end
-
-  vim.api.nvim_set_option_value('modifiable', true, { buf = bufnr })
-  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, diff_lines)
-  vim.api.nvim_set_option_value('modifiable', false, { buf = bufnr })
-  vim.api.nvim_set_option_value('buftype', 'nowrite', { buf = bufnr })
-  vim.api.nvim_set_option_value('bufhidden', 'delete', { buf = bufnr })
-  vim.api.nvim_set_option_value('swapfile', false, { buf = bufnr })
-  vim.api.nvim_set_option_value('filetype', 'diff', { buf = bufnr })
-
-  dbg('reloaded diff buffer %d (%s:%s)', bufnr, label, path)
-
-  require('diffs').attach(bufnr)
-end
-
-function M.setup()
-  vim.api.nvim_create_user_command('Gdiff', function(opts)
-    M.gdiff(opts.args ~= '' and opts.args or nil, false)
-  end, {
-    nargs = '?',
-    desc = 'Show unified diff against git revision (default: HEAD)',
-  })
-
-  vim.api.nvim_create_user_command('Gvdiff', function(opts)
-    M.gdiff(opts.args ~= '' and opts.args or nil, true)
-  end, {
-    nargs = '?',
-    desc = 'Show unified diff against git revision in vertical split',
-  })
-
-  vim.api.nvim_create_user_command('Ghdiff', function(opts)
-    M.gdiff(opts.args ~= '' and opts.args or nil, false)
-  end, {
-    nargs = '?',
-    desc = 'Show unified diff against git revision in horizontal split',
-  })
-end
-
-return M

lua/diffs/conflict.lua

@@ -1,438 +0,0 @@
----@class diffs.ConflictRegion
----@field marker_ours integer
----@field ours_start integer
----@field ours_end integer
----@field marker_base integer?
----@field base_start integer?
----@field base_end integer?
----@field marker_sep integer
----@field theirs_start integer
----@field theirs_end integer
----@field marker_theirs integer
-
-local M = {}
-
-local ns = vim.api.nvim_create_namespace('diffs-conflict')
-
----@type table<integer, true>
-local attached_buffers = {}
-
----@type table<integer, boolean>
-local diagnostics_suppressed = {}
-
-local PRIORITY_LINE_BG = 200
-
----@param lines string[]
----@return diffs.ConflictRegion[]
-function M.parse(lines)
-  local regions = {}
-  local state = 'idle'
-  ---@type table?
-  local current = nil
-
-  for i, line in ipairs(lines) do
-    local idx = i - 1
-
-    if state == 'idle' then
-      if line:match('^<<<<<<<') then
-        current = { marker_ours = idx, ours_start = idx + 1 }
-        state = 'in_ours'
-      end
-    elseif state == 'in_ours' then
-      if line:match('^|||||||') then
-        current.ours_end = idx
-        current.marker_base = idx
-        current.base_start = idx + 1
-        state = 'in_base'
-      elseif line:match('^=======') then
-        current.ours_end = idx
-        current.marker_sep = idx
-        current.theirs_start = idx + 1
-        state = 'in_theirs'
-      elseif line:match('^<<<<<<<') then
-        current = { marker_ours = idx, ours_start = idx + 1 }
-      elseif line:match('^>>>>>>>') then
-        current = nil
-        state = 'idle'
-      end
-    elseif state == 'in_base' then
-      if line:match('^=======') then
-        current.base_end = idx
-        current.marker_sep = idx
-        current.theirs_start = idx + 1
-        state = 'in_theirs'
-      elseif line:match('^<<<<<<<') then
-        current = { marker_ours = idx, ours_start = idx + 1 }
-        state = 'in_ours'
-      elseif line:match('^>>>>>>>') then
-        current = nil
-        state = 'idle'
-      end
-    elseif state == 'in_theirs' then
-      if line:match('^>>>>>>>') then
-        current.theirs_end = idx
-        current.marker_theirs = idx
-        table.insert(regions, current)
-        current = nil
-        state = 'idle'
-      elseif line:match('^<<<<<<<') then
-        current = { marker_ours = idx, ours_start = idx + 1 }
-        state = 'in_ours'
-      end
-    end
-  end
-
-  return regions
-end
-
----@param bufnr integer
----@return diffs.ConflictRegion[]
-local function parse_buffer(bufnr)
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-  return M.parse(lines)
-end
-
----@param bufnr integer
----@param regions diffs.ConflictRegion[]
----@param config diffs.ConflictConfig
-local function apply_highlights(bufnr, regions, config)
-  vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
-
-  for _, region in ipairs(regions) do
-    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_ours, 0, {
-      end_row = region.marker_ours + 1,
-      hl_group = 'DiffsConflictMarker',
-      hl_eol = true,
-      priority = PRIORITY_LINE_BG,
-    })
-
-    if config.show_virtual_text then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_ours, 0, {
-        virt_text = { { ' (current)', 'DiffsConflictMarker' } },
-        virt_text_pos = 'eol',
-      })
-    end
-
-    for line = region.ours_start, region.ours_end - 1 do
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-        end_row = line + 1,
-        hl_group = 'DiffsConflictOurs',
-        hl_eol = true,
-        priority = PRIORITY_LINE_BG,
-      })
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-        number_hl_group = 'DiffsConflictOursNr',
-        priority = PRIORITY_LINE_BG,
-      })
-    end
-
-    if region.marker_base then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_base, 0, {
-        end_row = region.marker_base + 1,
-        hl_group = 'DiffsConflictMarker',
-        hl_eol = true,
-        priority = PRIORITY_LINE_BG,
-      })
-
-      for line = region.base_start, region.base_end - 1 do
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-          end_row = line + 1,
-          hl_group = 'DiffsConflictBase',
-          hl_eol = true,
-          priority = PRIORITY_LINE_BG,
-        })
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-          number_hl_group = 'DiffsConflictBaseNr',
-          priority = PRIORITY_LINE_BG,
-        })
-      end
-    end
-
-    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_sep, 0, {
-      end_row = region.marker_sep + 1,
-      hl_group = 'DiffsConflictMarker',
-      hl_eol = true,
-      priority = PRIORITY_LINE_BG,
-    })
-
-    for line = region.theirs_start, region.theirs_end - 1 do
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-        end_row = line + 1,
-        hl_group = 'DiffsConflictTheirs',
-        hl_eol = true,
-        priority = PRIORITY_LINE_BG,
-      })
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
-        number_hl_group = 'DiffsConflictTheirsNr',
-        priority = PRIORITY_LINE_BG,
-      })
-    end
-
-    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_theirs, 0, {
-      end_row = region.marker_theirs + 1,
-      hl_group = 'DiffsConflictMarker',
-      hl_eol = true,
-      priority = PRIORITY_LINE_BG,
-    })
-
-    if config.show_virtual_text then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_theirs, 0, {
-        virt_text = { { ' (incoming)', 'DiffsConflictMarker' } },
-        virt_text_pos = 'eol',
-      })
-    end
-  end
-end
-
----@param cursor_line integer
----@param regions diffs.ConflictRegion[]
----@return diffs.ConflictRegion?
-local function find_conflict_at_cursor(cursor_line, regions)
-  for _, region in ipairs(regions) do
-    if cursor_line >= region.marker_ours and cursor_line <= region.marker_theirs then
-      return region
-    end
-  end
-  return nil
-end
-
----@param bufnr integer
----@param region diffs.ConflictRegion
----@param replacement string[]
-local function replace_region(bufnr, region, replacement)
-  vim.api.nvim_buf_set_lines(
-    bufnr,
-    region.marker_ours,
-    region.marker_theirs + 1,
-    false,
-    replacement
-  )
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-local function refresh(bufnr, config)
-  local regions = parse_buffer(bufnr)
-  if #regions == 0 then
-    vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
-    if diagnostics_suppressed[bufnr] then
-      pcall(vim.diagnostic.reset, nil, bufnr)
-      pcall(vim.diagnostic.enable, true, { bufnr = bufnr })
-      diagnostics_suppressed[bufnr] = nil
-    end
-    vim.api.nvim_exec_autocmds('User', { pattern = 'DiffsConflictResolved' })
-    return
-  end
-  apply_highlights(bufnr, regions, config)
-  if config.disable_diagnostics and not diagnostics_suppressed[bufnr] then
-    pcall(vim.diagnostic.enable, false, { bufnr = bufnr })
-    diagnostics_suppressed[bufnr] = true
-  end
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_ours(bufnr, config)
-  if not vim.api.nvim_get_option_value('modifiable', { buf = bufnr }) then
-    vim.notify('[diffs.nvim]: buffer is not modifiable', vim.log.levels.WARN)
-    return
-  end
-  local regions = parse_buffer(bufnr)
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local region = find_conflict_at_cursor(cursor[1] - 1, regions)
-  if not region then
-    return
-  end
-  local lines = vim.api.nvim_buf_get_lines(bufnr, region.ours_start, region.ours_end, false)
-  replace_region(bufnr, region, lines)
-  refresh(bufnr, config)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_theirs(bufnr, config)
-  if not vim.api.nvim_get_option_value('modifiable', { buf = bufnr }) then
-    vim.notify('[diffs.nvim]: buffer is not modifiable', vim.log.levels.WARN)
-    return
-  end
-  local regions = parse_buffer(bufnr)
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local region = find_conflict_at_cursor(cursor[1] - 1, regions)
-  if not region then
-    return
-  end
-  local lines = vim.api.nvim_buf_get_lines(bufnr, region.theirs_start, region.theirs_end, false)
-  replace_region(bufnr, region, lines)
-  refresh(bufnr, config)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_both(bufnr, config)
-  if not vim.api.nvim_get_option_value('modifiable', { buf = bufnr }) then
-    vim.notify('[diffs.nvim]: buffer is not modifiable', vim.log.levels.WARN)
-    return
-  end
-  local regions = parse_buffer(bufnr)
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local region = find_conflict_at_cursor(cursor[1] - 1, regions)
-  if not region then
-    return
-  end
-  local ours = vim.api.nvim_buf_get_lines(bufnr, region.ours_start, region.ours_end, false)
-  local theirs = vim.api.nvim_buf_get_lines(bufnr, region.theirs_start, region.theirs_end, false)
-  local combined = {}
-  for _, l in ipairs(ours) do
-    table.insert(combined, l)
-  end
-  for _, l in ipairs(theirs) do
-    table.insert(combined, l)
-  end
-  replace_region(bufnr, region, combined)
-  refresh(bufnr, config)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_none(bufnr, config)
-  if not vim.api.nvim_get_option_value('modifiable', { buf = bufnr }) then
-    vim.notify('[diffs.nvim]: buffer is not modifiable', vim.log.levels.WARN)
-    return
-  end
-  local regions = parse_buffer(bufnr)
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local region = find_conflict_at_cursor(cursor[1] - 1, regions)
-  if not region then
-    return
-  end
-  replace_region(bufnr, region, {})
-  refresh(bufnr, config)
-end
-
----@param bufnr integer
-function M.goto_next(bufnr)
-  local regions = parse_buffer(bufnr)
-  if #regions == 0 then
-    return
-  end
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local cursor_line = cursor[1] - 1
-  for _, region in ipairs(regions) do
-    if region.marker_ours > cursor_line then
-      vim.api.nvim_win_set_cursor(0, { region.marker_ours + 1, 0 })
-      return
-    end
-  end
-  vim.api.nvim_win_set_cursor(0, { regions[1].marker_ours + 1, 0 })
-end
-
----@param bufnr integer
-function M.goto_prev(bufnr)
-  local regions = parse_buffer(bufnr)
-  if #regions == 0 then
-    return
-  end
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local cursor_line = cursor[1] - 1
-  for i = #regions, 1, -1 do
-    if regions[i].marker_ours < cursor_line then
-      vim.api.nvim_win_set_cursor(0, { regions[i].marker_ours + 1, 0 })
-      return
-    end
-  end
-  vim.api.nvim_win_set_cursor(0, { regions[#regions].marker_ours + 1, 0 })
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-local function setup_keymaps(bufnr, config)
-  local km = config.keymaps
-
-  local maps = {
-    { km.ours, '<Plug>(diffs-conflict-ours)' },
-    { km.theirs, '<Plug>(diffs-conflict-theirs)' },
-    { km.both, '<Plug>(diffs-conflict-both)' },
-    { km.none, '<Plug>(diffs-conflict-none)' },
-    { km.next, '<Plug>(diffs-conflict-next)' },
-    { km.prev, '<Plug>(diffs-conflict-prev)' },
-  }
-
-  for _, map in ipairs(maps) do
-    if map[1] then
-      vim.keymap.set('n', map[1], map[2], { buffer = bufnr })
-    end
-  end
-end
-
----@param bufnr integer
-function M.detach(bufnr)
-  vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
-  attached_buffers[bufnr] = nil
-
-  if diagnostics_suppressed[bufnr] then
-    pcall(vim.diagnostic.reset, nil, bufnr)
-    pcall(vim.diagnostic.enable, true, { bufnr = bufnr })
-    diagnostics_suppressed[bufnr] = nil
-  end
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.attach(bufnr, config)
-  if attached_buffers[bufnr] then
-    return
-  end
-
-  local buftype = vim.api.nvim_get_option_value('buftype', { buf = bufnr })
-  if buftype ~= '' then
-    return
-  end
-
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-  local has_marker = false
-  for _, line in ipairs(lines) do
-    if line:match('^<<<<<<<') then
-      has_marker = true
-      break
-    end
-  end
-  if not has_marker then
-    return
-  end
-
-  attached_buffers[bufnr] = true
-
-  local regions = M.parse(lines)
-  apply_highlights(bufnr, regions, config)
-  setup_keymaps(bufnr, config)
-
-  if config.disable_diagnostics then
-    pcall(vim.diagnostic.enable, false, { bufnr = bufnr })
-    diagnostics_suppressed[bufnr] = true
-  end
-
-  vim.api.nvim_create_autocmd({ 'TextChanged', 'TextChangedI' }, {
-    buffer = bufnr,
-    callback = function()
-      if not attached_buffers[bufnr] then
-        return true
-      end
-      refresh(bufnr, config)
-    end,
-  })
-
-  vim.api.nvim_create_autocmd('BufWipeout', {
-    buffer = bufnr,
-    callback = function()
-      attached_buffers[bufnr] = nil
-      diagnostics_suppressed[bufnr] = nil
-    end,
-  })
-end
-
----@return integer
-function M.get_namespace()
-  return ns
-end
-
-return M

lua/diffs/debug.lua

@@ -1,70 +0,0 @@
-local M = {}
-
-local ns = vim.api.nvim_create_namespace('diffs')
-
-function M.dump()
-  local bufnr = vim.api.nvim_get_current_buf()
-  local marks = vim.api.nvim_buf_get_extmarks(bufnr, ns, 0, -1, { details = true })
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-
-  local by_line = {}
-  for _, mark in ipairs(marks) do
-    local id, row, col, details = mark[1], mark[2], mark[3], mark[4]
-    local entry = {
-      id = id,
-      row = row,
-      col = col,
-      end_row = details.end_row,
-      end_col = details.end_col,
-      hl_group = details.hl_group,
-      priority = details.priority,
-      hl_eol = details.hl_eol,
-      line_hl_group = details.line_hl_group,
-      number_hl_group = details.number_hl_group,
-      virt_text = details.virt_text,
-    }
-    local key = tostring(row)
-    if not by_line[key] then
-      by_line[key] = { text = lines[row + 1] or '', marks = {} }
-    end
-    table.insert(by_line[key].marks, entry)
-  end
-
-  local all_ns_marks = vim.api.nvim_buf_get_extmarks(bufnr, -1, 0, -1, { details = true })
-  local non_diffs = {}
-  for _, mark in ipairs(all_ns_marks) do
-    local details = mark[4]
-    if details.ns_id ~= ns then
-      table.insert(non_diffs, {
-        ns_id = details.ns_id,
-        row = mark[2],
-        col = mark[3],
-        end_row = details.end_row,
-        end_col = details.end_col,
-        hl_group = details.hl_group,
-        priority = details.priority,
-      })
-    end
-  end
-
-  local result = {
-    bufnr = bufnr,
-    buf_name = vim.api.nvim_buf_get_name(bufnr),
-    ns_id = ns,
-    total_diffs_marks = #marks,
-    total_all_marks = #all_ns_marks,
-    non_diffs_marks = non_diffs,
-    lines = by_line,
-  }
-
-  local state_dir = vim.fn.stdpath('state')
-  local path = state_dir .. '/diffs_debug.json'
-  local f = io.open(path, 'w')
-  if f then
-    f:write(vim.json.encode(result))
-    f:close()
-    vim.notify('[diffs.nvim] debug dump: ' .. path, vim.log.levels.INFO)
-  end
-end
-
-return M

lua/diffs/diff.lua

@@ -1,401 +0,0 @@
----@class diffs.CharSpan
----@field line integer
----@field col_start integer
----@field col_end integer
-
----@class diffs.IntraChanges
----@field add_spans diffs.CharSpan[]
----@field del_spans diffs.CharSpan[]
-
----@class diffs.ChangeGroup
----@field del_lines {idx: integer, text: string}[]
----@field add_lines {idx: integer, text: string}[]
-
----@class diffs.DiffOpts
----@field algorithm? string
----@field linematch? integer
-
-local M = {}
-
-local dbg = require('diffs.log').dbg
-
----@param hunk_lines string[]
----@return diffs.ChangeGroup[]
-function M.extract_change_groups(hunk_lines)
-  ---@type diffs.ChangeGroup[]
-  local groups = {}
-  ---@type {idx: integer, text: string}[]
-  local del_buf = {}
-  ---@type {idx: integer, text: string}[]
-  local add_buf = {}
-
-  ---@type boolean
-  local in_del = false
-
-  for i, line in ipairs(hunk_lines) do
-    local prefix = line:sub(1, 1)
-    if prefix == '-' then
-      if not in_del and #add_buf > 0 then
-        if #del_buf > 0 then
-          table.insert(groups, { del_lines = del_buf, add_lines = add_buf })
-        end
-        del_buf = {}
-        add_buf = {}
-      end
-      in_del = true
-      table.insert(del_buf, { idx = i, text = line:sub(2) })
-    elseif prefix == '+' then
-      in_del = false
-      table.insert(add_buf, { idx = i, text = line:sub(2) })
-    else
-      if #del_buf > 0 and #add_buf > 0 then
-        table.insert(groups, { del_lines = del_buf, add_lines = add_buf })
-      end
-      del_buf = {}
-      add_buf = {}
-      in_del = false
-    end
-  end
-
-  if #del_buf > 0 and #add_buf > 0 then
-    table.insert(groups, { del_lines = del_buf, add_lines = add_buf })
-  end
-
-  return groups
-end
-
----@return diffs.DiffOpts
-local function parse_diffopt()
-  local opts = {}
-  for _, item in ipairs(vim.split(vim.o.diffopt, ',')) do
-    local key, val = item:match('^(%w+):(.+)$')
-    if key == 'algorithm' then
-      opts.algorithm = val
-    elseif key == 'linematch' then
-      opts.linematch = tonumber(val)
-    end
-  end
-  return opts
-end
-
----@param old_text string
----@param new_text string
----@param diff_opts? diffs.DiffOpts
----@return {old_start: integer, old_count: integer, new_start: integer, new_count: integer}[]
-local function byte_diff(old_text, new_text, diff_opts)
-  local vim_opts = { result_type = 'indices' }
-  if diff_opts then
-    if diff_opts.algorithm then
-      vim_opts.algorithm = diff_opts.algorithm
-    end
-    if diff_opts.linematch then
-      vim_opts.linematch = diff_opts.linematch
-    end
-  end
-  local ok, result = pcall(vim.diff, old_text, new_text, vim_opts)
-  if not ok or not result then
-    return {}
-  end
-  ---@type {old_start: integer, old_count: integer, new_start: integer, new_count: integer}[]
-  local hunks = {}
-  for _, h in ipairs(result) do
-    table.insert(hunks, {
-      old_start = h[1],
-      old_count = h[2],
-      new_start = h[3],
-      new_count = h[4],
-    })
-  end
-  return hunks
-end
-
----@param s string
----@return string[]
-local function split_bytes(s)
-  local bytes = {}
-  for i = 1, #s do
-    table.insert(bytes, s:sub(i, i))
-  end
-  return bytes
-end
-
----@param old_line string
----@param new_line string
----@param del_idx integer
----@param add_idx integer
----@param diff_opts? diffs.DiffOpts
----@return diffs.CharSpan[], diffs.CharSpan[]
-local function char_diff_pair(old_line, new_line, del_idx, add_idx, diff_opts)
-  ---@type diffs.CharSpan[]
-  local del_spans = {}
-  ---@type diffs.CharSpan[]
-  local add_spans = {}
-
-  local old_bytes = split_bytes(old_line)
-  local new_bytes = split_bytes(new_line)
-
-  local old_text = table.concat(old_bytes, '\n') .. '\n'
-  local new_text = table.concat(new_bytes, '\n') .. '\n'
-
-  local char_opts = diff_opts
-  if diff_opts and diff_opts.linematch then
-    char_opts = { algorithm = diff_opts.algorithm }
-  end
-
-  local char_hunks = byte_diff(old_text, new_text, char_opts)
-
-  for _, ch in ipairs(char_hunks) do
-    if ch.old_count > 0 then
-      table.insert(del_spans, {
-        line = del_idx,
-        col_start = ch.old_start,
-        col_end = ch.old_start + ch.old_count,
-      })
-    end
-
-    if ch.new_count > 0 then
-      table.insert(add_spans, {
-        line = add_idx,
-        col_start = ch.new_start,
-        col_end = ch.new_start + ch.new_count,
-      })
-    end
-  end
-
-  return del_spans, add_spans
-end
-
----@param group diffs.ChangeGroup
----@param diff_opts? diffs.DiffOpts
----@return diffs.CharSpan[], diffs.CharSpan[]
-local function diff_group_native(group, diff_opts)
-  ---@type diffs.CharSpan[]
-  local all_del = {}
-  ---@type diffs.CharSpan[]
-  local all_add = {}
-
-  local del_count = #group.del_lines
-  local add_count = #group.add_lines
-
-  if del_count == 1 and add_count == 1 then
-    local ds, as = char_diff_pair(
-      group.del_lines[1].text,
-      group.add_lines[1].text,
-      group.del_lines[1].idx,
-      group.add_lines[1].idx,
-      diff_opts
-    )
-    vim.list_extend(all_del, ds)
-    vim.list_extend(all_add, as)
-    return all_del, all_add
-  end
-
-  local old_texts = {}
-  for _, l in ipairs(group.del_lines) do
-    table.insert(old_texts, l.text)
-  end
-  local new_texts = {}
-  for _, l in ipairs(group.add_lines) do
-    table.insert(new_texts, l.text)
-  end
-
-  local old_block = table.concat(old_texts, '\n') .. '\n'
-  local new_block = table.concat(new_texts, '\n') .. '\n'
-
-  local line_hunks = byte_diff(old_block, new_block, diff_opts)
-
-  ---@type table<integer, integer>
-  local old_to_new = {}
-  for _, lh in ipairs(line_hunks) do
-    if lh.old_count == lh.new_count then
-      for k = 0, lh.old_count - 1 do
-        old_to_new[lh.old_start + k] = lh.new_start + k
-      end
-    end
-  end
-
-  for old_i, new_i in pairs(old_to_new) do
-    if group.del_lines[old_i] and group.add_lines[new_i] then
-      local ds, as = char_diff_pair(
-        group.del_lines[old_i].text,
-        group.add_lines[new_i].text,
-        group.del_lines[old_i].idx,
-        group.add_lines[new_i].idx,
-        diff_opts
-      )
-      vim.list_extend(all_del, ds)
-      vim.list_extend(all_add, as)
-    end
-  end
-
-  for _, lh in ipairs(line_hunks) do
-    if lh.old_count ~= lh.new_count then
-      local pairs_count = math.min(lh.old_count, lh.new_count)
-      for k = 0, pairs_count - 1 do
-        local oi = lh.old_start + k
-        local ni = lh.new_start + k
-        if group.del_lines[oi] and group.add_lines[ni] then
-          local ds, as = char_diff_pair(
-            group.del_lines[oi].text,
-            group.add_lines[ni].text,
-            group.del_lines[oi].idx,
-            group.add_lines[ni].idx,
-            diff_opts
-          )
-          vim.list_extend(all_del, ds)
-          vim.list_extend(all_add, as)
-        end
-      end
-    end
-  end
-
-  return all_del, all_add
-end
-
----@param group diffs.ChangeGroup
----@param handle table
----@return diffs.CharSpan[], diffs.CharSpan[]
-local function diff_group_vscode(group, handle)
-  ---@type diffs.CharSpan[]
-  local all_del = {}
-  ---@type diffs.CharSpan[]
-  local all_add = {}
-
-  local ffi = require('ffi')
-
-  local old_texts = {}
-  for _, l in ipairs(group.del_lines) do
-    table.insert(old_texts, l.text)
-  end
-  local new_texts = {}
-  for _, l in ipairs(group.add_lines) do
-    table.insert(new_texts, l.text)
-  end
-
-  local orig_arr = ffi.new('const char*[?]', #old_texts)
-  for i, t in ipairs(old_texts) do
-    orig_arr[i - 1] = t
-  end
-
-  local mod_arr = ffi.new('const char*[?]', #new_texts)
-  for i, t in ipairs(new_texts) do
-    mod_arr[i - 1] = t
-  end
-
-  local opts = ffi.new('DiffsDiffOptions', {
-    ignore_trim_whitespace = false,
-    max_computation_time_ms = 1000,
-    compute_moves = false,
-    extend_to_subwords = false,
-  })
-
-  local result = handle.compute_diff(orig_arr, #old_texts, mod_arr, #new_texts, opts)
-  if result == nil then
-    return all_del, all_add
-  end
-
-  for ci = 0, result.changes.count - 1 do
-    local mapping = result.changes.mappings[ci]
-    for ii = 0, mapping.inner_change_count - 1 do
-      local inner = mapping.inner_changes[ii]
-
-      local orig_line = inner.original.start_line
-      if group.del_lines[orig_line] then
-        table.insert(all_del, {
-          line = group.del_lines[orig_line].idx,
-          col_start = inner.original.start_col,
-          col_end = inner.original.end_col,
-        })
-      end
-
-      local mod_line = inner.modified.start_line
-      if group.add_lines[mod_line] then
-        table.insert(all_add, {
-          line = group.add_lines[mod_line].idx,
-          col_start = inner.modified.start_col,
-          col_end = inner.modified.end_col,
-        })
-      end
-    end
-  end
-
-  handle.free_lines_diff(result)
-
-  return all_del, all_add
-end
-
----@param hunk_lines string[]
----@param algorithm? string
----@return diffs.IntraChanges?
-function M.compute_intra_hunks(hunk_lines, algorithm)
-  local groups = M.extract_change_groups(hunk_lines)
-  if #groups == 0 then
-    return nil
-  end
-
-  algorithm = algorithm or 'default'
-
-  local vscode_handle = nil
-  if algorithm == 'vscode' then
-    vscode_handle = require('diffs.lib').load()
-    if not vscode_handle then
-      dbg('vscode algorithm requested but library not available, falling back to default')
-    end
-  end
-
-  ---@type diffs.DiffOpts?
-  local diff_opts = nil
-  if not vscode_handle then
-    diff_opts = parse_diffopt()
-    if diff_opts.algorithm then
-      dbg('diffopt algorithm: %s', diff_opts.algorithm)
-    end
-    if diff_opts.linematch then
-      dbg('diffopt linematch: %d', diff_opts.linematch)
-    end
-  end
-
-  ---@type diffs.CharSpan[]
-  local all_add = {}
-  ---@type diffs.CharSpan[]
-  local all_del = {}
-
-  dbg(
-    'intra: %d change groups, algorithm=%s, vscode=%s',
-    #groups,
-    algorithm,
-    vscode_handle and 'yes' or 'no'
-  )
-
-  for gi, group in ipairs(groups) do
-    dbg('group %d: %d del lines, %d add lines', gi, #group.del_lines, #group.add_lines)
-    local ds, as
-    if vscode_handle then
-      ds, as = diff_group_vscode(group, vscode_handle)
-    else
-      ds, as = diff_group_native(group, diff_opts)
-    end
-    dbg('group %d result: %d del spans, %d add spans', gi, #ds, #as)
-    for _, s in ipairs(ds) do
-      dbg('  del span: line=%d col=%d..%d', s.line, s.col_start, s.col_end)
-    end
-    for _, s in ipairs(as) do
-      dbg('  add span: line=%d col=%d..%d', s.line, s.col_start, s.col_end)
-    end
-    vim.list_extend(all_del, ds)
-    vim.list_extend(all_add, as)
-  end
-
-  if #all_add == 0 and #all_del == 0 then
-    return nil
-  end
-
-  return { add_spans = all_add, del_spans = all_del }
-end
-
----@return boolean
-function M.has_vscode()
-  return require('diffs.lib').has_lib()
-end
-
-return M

lua/diffs/fugitive.lua

@@ -1,218 +0,0 @@
-local M = {}
-
-local commands = require('diffs.commands')
-local git = require('diffs.git')
-local dbg = require('diffs.log').dbg
-
----@alias diffs.FugitiveSection 'staged' | 'unstaged' | 'untracked' | nil
-
----@param bufnr integer
----@param lnum integer
----@return diffs.FugitiveSection
-function M.get_section_at_line(bufnr, lnum)
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, lnum, false)
-
-  for i = #lines, 1, -1 do
-    local line = lines[i]
-    if line:match('^Staged ') then
-      return 'staged'
-    elseif line:match('^Unstaged ') then
-      return 'unstaged'
-    elseif line:match('^Untracked ') then
-      return 'untracked'
-    end
-  end
-
-  return nil
-end
-
----@param line string
----@return string?, string?
-local function parse_file_line(line)
-  local old, new = line:match('^R%d*%s+(.-)%s+->%s+(.+)$')
-  if old and new then
-    return vim.trim(new), vim.trim(old)
-  end
-
-  local filename = line:match('^[MADRCU?][MADRCU%s]*%s+(.+)$')
-  if filename then
-    return vim.trim(filename), nil
-  end
-
-  return nil, nil
-end
-
----@param line string
----@return diffs.FugitiveSection?
-local function parse_section_header(line)
-  if line:match('^Staged %(%d') then
-    return 'staged'
-  elseif line:match('^Unstaged %(%d') then
-    return 'unstaged'
-  elseif line:match('^Untracked %(%d') then
-    return 'untracked'
-  end
-  return nil
-end
-
----@param bufnr integer
----@param lnum integer
----@return string?, diffs.FugitiveSection, boolean, string?
-function M.get_file_at_line(bufnr, lnum)
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-  local current_line = lines[lnum]
-
-  if not current_line then
-    return nil, nil, false, nil
-  end
-
-  local section_header = parse_section_header(current_line)
-  if section_header then
-    return nil, section_header, true, nil
-  end
-
-  local filename, old_filename = parse_file_line(current_line)
-  if filename then
-    local section = M.get_section_at_line(bufnr, lnum)
-    return filename, section, false, old_filename
-  end
-
-  local prefix = current_line:sub(1, 1)
-  if prefix == '+' or prefix == '-' or prefix == ' ' then
-    for i = lnum - 1, 1, -1 do
-      local prev_line = lines[i]
-      filename, old_filename = parse_file_line(prev_line)
-      if filename then
-        local section = M.get_section_at_line(bufnr, i)
-        return filename, section, false, old_filename
-      end
-      if prev_line:match('^%w+ %(') or prev_line == '' then
-        break
-      end
-    end
-  end
-
-  return nil, nil, false, nil
-end
-
----@class diffs.HunkPosition
----@field hunk_header string
----@field offset integer
-
----@param bufnr integer
----@param lnum integer
----@return diffs.HunkPosition?
-function M.get_hunk_position(bufnr, lnum)
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, lnum, false)
-  local current = lines[lnum]
-
-  if not current then
-    return nil
-  end
-
-  local prefix = current:sub(1, 1)
-  if prefix ~= '+' and prefix ~= '-' and prefix ~= ' ' then
-    return nil
-  end
-
-  for i = lnum - 1, 1, -1 do
-    local line = lines[i]
-    if line:match('^@@.-@@') then
-      return {
-        hunk_header = line,
-        offset = lnum - i,
-      }
-    end
-    if line:match('^[MADRCU?!]%s') or line:match('^%w+ %(') then
-      break
-    end
-  end
-
-  return nil
-end
-
----@param bufnr integer
----@return string?
-local function get_repo_root_from_fugitive(bufnr)
-  local bufname = vim.api.nvim_buf_get_name(bufnr)
-  local fugitive_path = bufname:match('^fugitive://(.+)///')
-  if fugitive_path then
-    return fugitive_path
-  end
-
-  local cwd = vim.fn.getcwd()
-  local root = git.get_repo_root(cwd .. '/.')
-  return root
-end
-
----@param vertical boolean
-function M.diff_file_under_cursor(vertical)
-  local bufnr = vim.api.nvim_get_current_buf()
-  local lnum = vim.api.nvim_win_get_cursor(0)[1]
-
-  local filename, section, is_header, old_filename = M.get_file_at_line(bufnr, lnum)
-
-  local repo_root = get_repo_root_from_fugitive(bufnr)
-  if not repo_root then
-    vim.notify('[diffs.nvim]: could not determine repository root', vim.log.levels.ERROR)
-    return
-  end
-
-  if is_header then
-    dbg('diff_section: %s', section or 'unknown')
-    if section == 'untracked' then
-      vim.notify('[diffs.nvim]: cannot diff untracked section', vim.log.levels.WARN)
-      return
-    end
-    commands.gdiff_section(repo_root, {
-      vertical = vertical,
-      staged = section == 'staged',
-    })
-    return
-  end
-
-  if not filename then
-    vim.notify('[diffs.nvim]: no file under cursor', vim.log.levels.WARN)
-    return
-  end
-
-  local filepath = repo_root .. '/' .. filename
-  local old_filepath = old_filename and (repo_root .. '/' .. old_filename) or nil
-  local hunk_position = M.get_hunk_position(bufnr, lnum)
-
-  dbg(
-    'diff_file_under_cursor: %s (section: %s, old: %s, hunk_offset: %s)',
-    filename,
-    section or 'unknown',
-    old_filename or 'none',
-    hunk_position and tostring(hunk_position.offset) or 'none'
-  )
-
-  commands.gdiff_file(filepath, {
-    vertical = vertical,
-    staged = section == 'staged',
-    untracked = section == 'untracked',
-    old_filepath = old_filepath,
-    hunk_position = hunk_position,
-  })
-end
-
----@param bufnr integer
----@param config { horizontal: string|false, vertical: string|false }
-function M.setup_keymaps(bufnr, config)
-  if config.horizontal and config.horizontal ~= '' then
-    vim.keymap.set('n', config.horizontal, function()
-      M.diff_file_under_cursor(false)
-    end, { buffer = bufnr, desc = 'Unified diff (horizontal)' })
-    dbg('set keymap %s for buffer %d', config.horizontal, bufnr)
-  end
-
-  if config.vertical and config.vertical ~= '' then
-    vim.keymap.set('n', config.vertical, function()
-      M.diff_file_under_cursor(true)
-    end, { buffer = bufnr, desc = 'Unified diff (vertical)' })
-    dbg('set keymap %s for buffer %d', config.vertical, bufnr)
-  end
-end
-
-return M

lua/diffs/git.lua

@@ -1,113 +0,0 @@
-local M = {}
-
----@param filepath string
----@return string?
-function M.get_repo_root(filepath)
-  local dir = vim.fn.fnamemodify(filepath, ':h')
-  local result = vim.fn.systemlist({ 'git', '-C', dir, 'rev-parse', '--show-toplevel' })
-  if vim.v.shell_error ~= 0 then
-    return nil
-  end
-  return result[1]
-end
-
----@param revision string
----@param filepath string
----@return string[]?, string?
-function M.get_file_content(revision, filepath)
-  local repo_root = M.get_repo_root(filepath)
-  if not repo_root then
-    return nil, 'not in a git repository'
-  end
-
-  local rel_path = vim.fn.fnamemodify(filepath, ':.')
-  if vim.startswith(filepath, repo_root) then
-    rel_path = filepath:sub(#repo_root + 2)
-  end
-
-  local result = vim.fn.systemlist({ 'git', '-C', repo_root, 'show', revision .. ':' .. rel_path })
-  if vim.v.shell_error ~= 0 then
-    return nil, 'failed to get file at revision: ' .. revision
-  end
-  return result, nil
-end
-
----@param filepath string
----@return string?
-function M.get_relative_path(filepath)
-  local repo_root = M.get_repo_root(filepath)
-  if not repo_root then
-    return nil
-  end
-  if vim.startswith(filepath, repo_root) then
-    return filepath:sub(#repo_root + 2)
-  end
-  return vim.fn.fnamemodify(filepath, ':.')
-end
-
----@param filepath string
----@return string[]?, string?
-function M.get_index_content(filepath)
-  local repo_root = M.get_repo_root(filepath)
-  if not repo_root then
-    return nil, 'not in a git repository'
-  end
-
-  local rel_path = M.get_relative_path(filepath)
-  if not rel_path then
-    return nil, 'could not determine relative path'
-  end
-
-  local result = vim.fn.systemlist({ 'git', '-C', repo_root, 'show', ':0:' .. rel_path })
-  if vim.v.shell_error ~= 0 then
-    return nil, 'file not in index'
-  end
-  return result, nil
-end
-
----@param filepath string
----@return string[]?, string?
-function M.get_working_content(filepath)
-  if vim.fn.filereadable(filepath) ~= 1 then
-    return nil, 'file not readable'
-  end
-  local lines = vim.fn.readfile(filepath)
-  return lines, nil
-end
-
----@param filepath string
----@return boolean
-function M.file_exists_in_index(filepath)
-  local repo_root = M.get_repo_root(filepath)
-  if not repo_root then
-    return false
-  end
-
-  local rel_path = M.get_relative_path(filepath)
-  if not rel_path then
-    return false
-  end
-
-  vim.fn.system({ 'git', '-C', repo_root, 'ls-files', '--stage', '--', rel_path })
-  return vim.v.shell_error == 0
-end
-
----@param revision string
----@param filepath string
----@return boolean
-function M.file_exists_at_revision(revision, filepath)
-  local repo_root = M.get_repo_root(filepath)
-  if not repo_root then
-    return false
-  end
-
-  local rel_path = M.get_relative_path(filepath)
-  if not rel_path then
-    return false
-  end
-
-  vim.fn.system({ 'git', '-C', repo_root, 'cat-file', '-e', revision .. ':' .. rel_path })
-  return vim.v.shell_error == 0
-end
-
-return M

lua/diffs/health.lua

@@ -15,13 +15,6 @@ function M.check()
   else
     vim.health.warn('vim-fugitive not detected (required for unified diff highlighting)')
   end
-
-  local lib = require('diffs.lib')
-  if lib.has_lib() then
-    vim.health.ok('libvscode_diff found at ' .. lib.lib_path())
-  else
-    vim.health.info('libvscode_diff not found (optional, using native vim.diff fallback)')
-  end
 end
 
 return M

lua/diffs/highlight.lua

@@ -1,39 +1,6 @@
 local M = {}
 
 local dbg = require('diffs.log').dbg
-local diff = require('diffs.diff')
-
----@param filepath string
----@param from_line integer
----@param count integer
----@return string[]
-local function read_line_range(filepath, from_line, count)
-  if count <= 0 then
-    return {}
-  end
-  local f = io.open(filepath, 'r')
-  if not f then
-    return {}
-  end
-  local result = {}
-  local line_num = 0
-  for line in f:lines() do
-    line_num = line_num + 1
-    if line_num >= from_line then
-      table.insert(result, line)
-      if #result >= count then
-        break
-      end
-    end
-  end
-  f:close()
-  return result
-end
-
-local PRIORITY_CLEAR = 198
-local PRIORITY_SYNTAX = 199
-local PRIORITY_LINE_BG = 200
-local PRIORITY_CHAR_BG = 201
 
 ---@param bufnr integer
 ---@param ns integer
@@ -41,15 +8,9 @@ local PRIORITY_CHAR_BG = 201
 ---@param col_offset integer
 ---@param text string
 ---@param lang string
----@param context_lines? string[]
 ---@return integer
-local function highlight_text(bufnr, ns, hunk, col_offset, text, lang, context_lines)
-  local parse_text = text
-  if context_lines and #context_lines > 0 then
-    parse_text = text .. '\n' .. table.concat(context_lines, '\n')
-  end
-
-  local ok, parser_obj = pcall(vim.treesitter.get_string_parser, parse_text, lang)
+local function highlight_text(bufnr, ns, hunk, col_offset, text, lang)
+  local ok, parser_obj = pcall(vim.treesitter.get_string_parser, text, lang)
   if not ok or not parser_obj then
     return 0
   end
@@ -67,26 +28,22 @@ local function highlight_text(bufnr, ns, hunk, col_offset, text, lang, context_l
   local extmark_count = 0
   local header_line = hunk.start_line - 1
 
-  for id, node, metadata in query:iter_captures(trees[1]:root(), parse_text) do
-    local sr, sc, _, ec = node:range()
-    if sr == 0 then
-      local capture_name = '@' .. query.captures[id] .. '.' .. lang
+  for id, node, _ in query:iter_captures(trees[1]:root(), text) do
+    local capture_name = '@' .. query.captures[id]
+    local sr, sc, er, ec = node:range()
 
-      local buf_sr = header_line
-      local buf_er = header_line
-      local buf_sc = col_offset + sc
-      local buf_ec = col_offset + ec
+    local buf_sr = header_line + sr
+    local buf_er = header_line + er
+    local buf_sc = col_offset + sc
+    local buf_ec = col_offset + ec
 
-      local priority = lang == 'diff' and (tonumber(metadata.priority) or 100) or PRIORITY_SYNTAX
-
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
-        end_row = buf_er,
-        end_col = buf_ec,
-        hl_group = capture_name,
-        priority = priority,
-      })
-      extmark_count = extmark_count + 1
-    end
+    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
+      end_row = buf_er,
+      end_col = buf_ec,
+      hl_group = capture_name,
+      priority = 200,
+    })
+    extmark_count = extmark_count + 1
   end
 
   return extmark_count
@@ -94,25 +51,21 @@ end
 
 ---@class diffs.HunkOpts
 ---@field hide_prefix boolean
+---@field treesitter diffs.TreesitterConfig
+---@field vim diffs.VimConfig
 ---@field highlights diffs.Highlights
 
 ---@param bufnr integer
 ---@param ns integer
+---@param hunk diffs.Hunk
 ---@param code_lines string[]
----@param lang string
----@param line_map table<integer, integer>
----@param col_offset integer
----@param covered_lines? table<integer, true>
 ---@return integer
-local function highlight_treesitter(
-  bufnr,
-  ns,
-  code_lines,
-  lang,
-  line_map,
-  col_offset,
-  covered_lines
-)
+local function highlight_treesitter(bufnr, ns, hunk, code_lines)
+  local lang = hunk.lang
+  if not lang then
+    return 0
+  end
+
   local code = table.concat(code_lines, '\n')
   if code == '' then
     return 0
@@ -124,50 +77,50 @@ local function highlight_treesitter(
     return 0
   end
 
-  local trees = parser_obj:parse(true)
+  local trees = parser_obj:parse()
   if not trees or #trees == 0 then
     dbg('parse returned no trees for lang: %s', lang)
     return 0
   end
 
+  local query = vim.treesitter.query.get(lang, 'highlights')
+  if not query then
+    dbg('no highlights query for lang: %s', lang)
+    return 0
+  end
+
+  if hunk.header_context and hunk.header_context_col then
+    local header_line = hunk.start_line - 1
+    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, header_line, hunk.header_context_col, {
+      end_col = hunk.header_context_col + #hunk.header_context,
+      hl_group = 'Normal',
+      priority = 199,
+    })
+    local header_extmarks =
+      highlight_text(bufnr, ns, hunk, hunk.header_context_col, hunk.header_context, lang)
+    if header_extmarks > 0 then
+      dbg('header %s:%d applied %d extmarks', hunk.filename, hunk.start_line, header_extmarks)
+    end
+  end
+
   local extmark_count = 0
-  parser_obj:for_each_tree(function(tree, ltree)
-    local tree_lang = ltree:lang()
-    local query = vim.treesitter.query.get(tree_lang, 'highlights')
-    if not query then
-      return
-    end
+  for id, node, _ in query:iter_captures(trees[1]:root(), code) do
+    local capture_name = '@' .. query.captures[id]
+    local sr, sc, er, ec = node:range()
 
-    for id, node, metadata in query:iter_captures(tree:root(), code) do
-      local capture = query.captures[id]
-      if capture ~= 'spell' and capture ~= 'nospell' then
-        local capture_name = '@' .. capture .. '.' .. tree_lang
-        local sr, sc, er, ec = node:range()
+    local buf_sr = hunk.start_line + sr
+    local buf_er = hunk.start_line + er
+    local buf_sc = sc + 1
+    local buf_ec = ec + 1
 
-        local buf_sr = line_map[sr]
-        if buf_sr then
-          local buf_er = line_map[er] or buf_sr
-
-          local buf_sc = sc + col_offset
-          local buf_ec = ec + col_offset
-
-          local priority = tree_lang == 'diff' and (tonumber(metadata.priority) or 100)
-            or PRIORITY_SYNTAX
-
-          pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
-            end_row = buf_er,
-            end_col = buf_ec,
-            hl_group = capture_name,
-            priority = priority,
-          })
-          extmark_count = extmark_count + 1
-          if covered_lines then
-            covered_lines[buf_sr] = true
-          end
-        end
-      end
-    end
-  end)
+    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
+      end_row = buf_er,
+      end_col = buf_ec,
+      hl_group = capture_name,
+      priority = 200,
+    })
+    extmark_count = extmark_count + 1
+  end
 
   return extmark_count
 end
@@ -217,10 +170,8 @@ end
 ---@param ns integer
 ---@param hunk diffs.Hunk
 ---@param code_lines string[]
----@param covered_lines? table<integer, true>
----@param leading_offset? integer
 ---@return integer
-local function highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines, leading_offset)
+local function highlight_vim_syntax(bufnr, ns, hunk, code_lines)
   local ft = hunk.ft
   if not ft then
     return 0
@@ -230,8 +181,6 @@ local function highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines,
     return 0
   end
 
-  leading_offset = leading_offset or 0
-
   local scratch = vim.api.nvim_create_buf(false, true)
   vim.api.nvim_buf_set_lines(scratch, 0, -1, false, code_lines)
   vim.api.nvim_set_option_value('bufhidden', 'wipe', { buf = scratch })
@@ -258,22 +207,15 @@ local function highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines,
 
   vim.api.nvim_buf_delete(scratch, { force = true })
 
-  local hunk_line_count = #hunk.lines
   local extmark_count = 0
   for _, span in ipairs(spans) do
-    local adj = span.line - leading_offset
-    if adj >= 1 and adj <= hunk_line_count then
-      local buf_line = hunk.start_line + adj - 1
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start, {
-        end_col = span.col_end,
-        hl_group = span.hl_name,
-        priority = PRIORITY_SYNTAX,
-      })
-      extmark_count = extmark_count + 1
-      if covered_lines then
-        covered_lines[buf_line] = true
-      end
-    end
+    local buf_line = hunk.start_line + span.line - 1
+    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start, {
+      end_col = span.col_end,
+      hl_group = span.hl_name,
+      priority = 200,
+    })
+    extmark_count = extmark_count + 1
   end
 
   return extmark_count
@@ -284,10 +226,10 @@ end
 ---@param hunk diffs.Hunk
 ---@param opts diffs.HunkOpts
 function M.highlight_hunk(bufnr, ns, hunk, opts)
-  local use_ts = hunk.lang and opts.highlights.treesitter.enabled
-  local use_vim = not use_ts and hunk.ft and opts.highlights.vim.enabled
+  local use_ts = hunk.lang and opts.treesitter.enabled
+  local use_vim = not use_ts and hunk.ft and opts.vim.enabled
 
-  local max_lines = use_ts and opts.highlights.treesitter.max_lines or opts.highlights.vim.max_lines
+  local max_lines = use_ts and opts.treesitter.max_lines or opts.vim.max_lines
   if (use_ts or use_vim) and #hunk.lines > max_lines then
     dbg(
       'skipping hunk %s:%d (%d lines > %d max)',
@@ -300,151 +242,24 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
     use_vim = false
   end
 
-  ---@type table<integer, true>
-  local covered_lines = {}
+  local apply_syntax = use_ts or use_vim
 
-  local ctx_cfg = opts.highlights.context
-  local context = (ctx_cfg and ctx_cfg.enabled) and ctx_cfg.lines or 0
-  local leading = {}
-  local trailing = {}
-  if (use_ts or use_vim) and context > 0 and hunk.file_new_start and hunk.repo_root then
-    local filepath = vim.fs.joinpath(hunk.repo_root, hunk.filename)
-    local lead_from = math.max(1, hunk.file_new_start - context)
-    local lead_count = hunk.file_new_start - lead_from
-    if lead_count > 0 then
-      leading = read_line_range(filepath, lead_from, lead_count)
+  ---@type string[]
+  local code_lines = {}
+  if apply_syntax then
+    for _, line in ipairs(hunk.lines) do
+      table.insert(code_lines, line:sub(2))
     end
-    local trail_from = hunk.file_new_start + (hunk.file_new_count or 0)
-    trailing = read_line_range(filepath, trail_from, context)
   end
 
   local extmark_count = 0
   if use_ts then
-    ---@type string[]
-    local new_code = {}
-    ---@type table<integer, integer>
-    local new_map = {}
-    ---@type string[]
-    local old_code = {}
-    ---@type table<integer, integer>
-    local old_map = {}
-
-    for _, pad_line in ipairs(leading) do
-      table.insert(new_code, pad_line)
-      table.insert(old_code, pad_line)
-    end
-
-    for i, line in ipairs(hunk.lines) do
-      local prefix = line:sub(1, 1)
-      local stripped = line:sub(2)
-      local buf_line = hunk.start_line + i - 1
-
-      if prefix == '+' then
-        new_map[#new_code] = buf_line
-        table.insert(new_code, stripped)
-      elseif prefix == '-' then
-        old_map[#old_code] = buf_line
-        table.insert(old_code, stripped)
-      else
-        new_map[#new_code] = buf_line
-        table.insert(new_code, stripped)
-        table.insert(old_code, stripped)
-      end
-    end
-
-    for _, pad_line in ipairs(trailing) do
-      table.insert(new_code, pad_line)
-      table.insert(old_code, pad_line)
-    end
-
-    extmark_count = highlight_treesitter(bufnr, ns, new_code, hunk.lang, new_map, 1, covered_lines)
-    extmark_count = extmark_count
-      + highlight_treesitter(bufnr, ns, old_code, hunk.lang, old_map, 1, covered_lines)
-
-    if hunk.header_context and hunk.header_context_col then
-      local header_line = hunk.start_line - 1
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, header_line, hunk.header_context_col, {
-        end_col = hunk.header_context_col + #hunk.header_context,
-        hl_group = 'DiffsClear',
-        priority = PRIORITY_CLEAR,
-      })
-      local header_extmarks = highlight_text(
-        bufnr,
-        ns,
-        hunk,
-        hunk.header_context_col,
-        hunk.header_context,
-        hunk.lang,
-        new_code
-      )
-      if header_extmarks > 0 then
-        dbg('header %s:%d applied %d extmarks', hunk.filename, hunk.start_line, header_extmarks)
-      end
-      extmark_count = extmark_count + header_extmarks
-    end
+    extmark_count = highlight_treesitter(bufnr, ns, hunk, code_lines)
   elseif use_vim then
-    ---@type string[]
-    local code_lines = {}
-    for _, pad_line in ipairs(leading) do
-      table.insert(code_lines, pad_line)
-    end
-    for _, line in ipairs(hunk.lines) do
-      table.insert(code_lines, line:sub(2))
-    end
-    for _, pad_line in ipairs(trailing) do
-      table.insert(code_lines, pad_line)
-    end
-    extmark_count = highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines, #leading)
+    extmark_count = highlight_vim_syntax(bufnr, ns, hunk, code_lines)
   end
 
-  if
-    hunk.header_start_line
-    and hunk.header_lines
-    and #hunk.header_lines > 0
-    and opts.highlights.treesitter.enabled
-  then
-    ---@type table<integer, integer>
-    local header_map = {}
-    for i = 0, #hunk.header_lines - 1 do
-      header_map[i] = hunk.header_start_line - 1 + i
-    end
-    extmark_count = extmark_count
-      + highlight_treesitter(bufnr, ns, hunk.header_lines, 'diff', header_map, 0)
-  end
-
-  ---@type diffs.IntraChanges?
-  local intra = nil
-  local intra_cfg = opts.highlights.intra
-  if intra_cfg and intra_cfg.enabled and #hunk.lines <= intra_cfg.max_lines then
-    dbg('computing intra for hunk %s:%d (%d lines)', hunk.filename, hunk.start_line, #hunk.lines)
-    intra = diff.compute_intra_hunks(hunk.lines, intra_cfg.algorithm)
-    if intra then
-      dbg('intra result: %d add spans, %d del spans', #intra.add_spans, #intra.del_spans)
-    else
-      dbg('intra result: nil (no change groups)')
-    end
-  elseif intra_cfg and not intra_cfg.enabled then
-    dbg('intra disabled by config')
-  elseif intra_cfg and #hunk.lines > intra_cfg.max_lines then
-    dbg('intra skipped: %d lines > %d max', #hunk.lines, intra_cfg.max_lines)
-  end
-
-  ---@type table<integer, diffs.CharSpan[]>
-  local char_spans_by_line = {}
-  if intra then
-    for _, span in ipairs(intra.add_spans) do
-      if not char_spans_by_line[span.line] then
-        char_spans_by_line[span.line] = {}
-      end
-      table.insert(char_spans_by_line[span.line], span)
-    end
-    for _, span in ipairs(intra.del_spans) do
-      if not char_spans_by_line[span.line] then
-        char_spans_by_line[span.line] = {}
-      end
-      table.insert(char_spans_by_line[span.line], span)
-    end
-  end
+  local syntax_applied = extmark_count > 0
 
   for i, line in ipairs(hunk.lines) do
     local buf_line = hunk.start_line + i - 1
@@ -463,52 +278,24 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
       })
     end
 
-    if line_len > 1 and covered_lines[buf_line] then
+    if opts.highlights.background and is_diff_line then
+      local extmark_opts = {
+        line_hl_group = line_hl,
+        priority = 198,
+      }
+      if opts.highlights.gutter then
+        extmark_opts.number_hl_group = number_hl
+      end
+      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, extmark_opts)
+    end
+
+    if line_len > 1 and syntax_applied then
       pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 1, {
         end_col = line_len,
-        hl_group = 'DiffsClear',
-        priority = PRIORITY_CLEAR,
+        hl_group = 'Normal',
+        priority = 199,
       })
     end
-
-    if opts.highlights.background and is_diff_line then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, {
-        end_row = buf_line + 1,
-        hl_group = line_hl,
-        hl_eol = true,
-        priority = PRIORITY_LINE_BG,
-      })
-      if opts.highlights.gutter then
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, {
-          number_hl_group = number_hl,
-          priority = PRIORITY_LINE_BG,
-        })
-      end
-    end
-
-    if char_spans_by_line[i] then
-      local char_hl = prefix == '+' and 'DiffsAddText' or 'DiffsDeleteText'
-      for _, span in ipairs(char_spans_by_line[i]) do
-        dbg(
-          'char extmark: line=%d buf_line=%d col=%d..%d hl=%s text="%s"',
-          i,
-          buf_line,
-          span.col_start,
-          span.col_end,
-          char_hl,
-          line:sub(span.col_start + 1, span.col_end)
-        )
-        local ok, err = pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start, {
-          end_col = span.col_end,
-          hl_group = char_hl,
-          priority = PRIORITY_CHAR_BG,
-        })
-        if not ok then
-          dbg('char extmark FAILED: %s', err)
-        end
-        extmark_count = extmark_count + 1
-      end
-    end
   end
 
   dbg('hunk %s:%d applied %d extmarks', hunk.filename, hunk.start_line, extmark_count)

lua/diffs/init.lua

@@ -1,3 +1,7 @@
+---@class diffs.Highlights
+---@field background boolean
+---@field gutter boolean
+
 ---@class diffs.TreesitterConfig
 ---@field enabled boolean
 ---@field max_lines integer
@@ -6,54 +10,19 @@
 ---@field enabled boolean
 ---@field max_lines integer
 
----@class diffs.IntraConfig
----@field enabled boolean
----@field algorithm string
----@field max_lines integer
-
----@class diffs.ContextConfig
----@field enabled boolean
----@field lines integer
-
----@class diffs.Highlights
----@field background boolean
----@field gutter boolean
----@field blend_alpha? number
----@field overrides? table<string, table>
----@field context diffs.ContextConfig
----@field treesitter diffs.TreesitterConfig
----@field vim diffs.VimConfig
----@field intra diffs.IntraConfig
-
----@class diffs.FugitiveConfig
----@field horizontal string|false
----@field vertical string|false
-
----@class diffs.ConflictKeymaps
----@field ours string|false
----@field theirs string|false
----@field both string|false
----@field none string|false
----@field next string|false
----@field prev string|false
-
----@class diffs.ConflictConfig
----@field enabled boolean
----@field disable_diagnostics boolean
----@field show_virtual_text boolean
----@field keymaps diffs.ConflictKeymaps
-
 ---@class diffs.Config
+---@field enabled boolean
 ---@field debug boolean
 ---@field debounce_ms integer
 ---@field hide_prefix boolean
+---@field treesitter diffs.TreesitterConfig
+---@field vim diffs.VimConfig
 ---@field highlights diffs.Highlights
----@field fugitive diffs.FugitiveConfig
----@field conflict diffs.ConflictConfig
 
 ---@class diffs
 ---@field attach fun(bufnr?: integer)
 ---@field refresh fun(bufnr?: integer)
+---@field setup fun(opts?: diffs.Config)
 local M = {}
 
 local highlight = require('diffs.highlight')
@@ -96,54 +65,27 @@ end
 
 ---@type diffs.Config
 local default_config = {
+  enabled = true,
   debug = false,
   debounce_ms = 0,
   hide_prefix = false,
+  treesitter = {
+    enabled = true,
+    max_lines = 500,
+  },
+  vim = {
+    enabled = false,
+    max_lines = 200,
+  },
   highlights = {
     background = true,
     gutter = true,
-    context = {
-      enabled = true,
-      lines = 25,
-    },
-    treesitter = {
-      enabled = true,
-      max_lines = 500,
-    },
-    vim = {
-      enabled = false,
-      max_lines = 200,
-    },
-    intra = {
-      enabled = true,
-      algorithm = 'default',
-      max_lines = 500,
-    },
-  },
-  fugitive = {
-    horizontal = 'du',
-    vertical = 'dU',
-  },
-  conflict = {
-    enabled = true,
-    disable_diagnostics = true,
-    show_virtual_text = true,
-    keymaps = {
-      ours = 'doo',
-      theirs = 'dot',
-      both = 'dob',
-      none = 'don',
-      next = ']x',
-      prev = '[x',
-    },
   },
 }
 
 ---@type diffs.Config
 local config = vim.deepcopy(default_config)
 
-local initialized = false
-
 ---@type table<integer, boolean>
 local attached_buffers = {}
 
@@ -160,6 +102,10 @@ local dbg = log.dbg
 
 ---@param bufnr integer
 local function highlight_buffer(bufnr)
+  if not config.enabled then
+    return
+  end
+
   if not vim.api.nvim_buf_is_valid(bufnr) then
     return
   end
@@ -171,6 +117,8 @@ local function highlight_buffer(bufnr)
   for _, hunk in ipairs(hunks) do
     highlight.highlight_hunk(bufnr, ns, hunk, {
       hide_prefix = config.hide_prefix,
+      treesitter = config.treesitter,
+      vim = config.vim,
       highlights = config.highlights,
     })
   end
@@ -206,277 +154,8 @@ local function create_debounced_highlight(bufnr)
   end
 end
 
-local function compute_highlight_groups()
-  local normal = vim.api.nvim_get_hl(0, { name = 'Normal' })
-  local diff_add = vim.api.nvim_get_hl(0, { name = 'DiffAdd' })
-  local diff_delete = vim.api.nvim_get_hl(0, { name = 'DiffDelete' })
-  local diff_added = resolve_hl('diffAdded')
-  local diff_removed = resolve_hl('diffRemoved')
-
-  local bg = normal.bg or 0x1e1e2e
-  local add_bg = diff_add.bg or 0x2e4a3a
-  local del_bg = diff_delete.bg or 0x4a2e3a
-  local add_fg = diff_added.fg or diff_add.fg or 0x80c080
-  local del_fg = diff_removed.fg or diff_delete.fg or 0xc08080
-
-  local blended_add = blend_color(add_bg, bg, 0.4)
-  local blended_del = blend_color(del_bg, bg, 0.4)
-
-  local alpha = config.highlights.blend_alpha or 0.6
-  local blended_add_text = blend_color(add_fg, bg, alpha)
-  local blended_del_text = blend_color(del_fg, bg, alpha)
-
-  vim.api.nvim_set_hl(0, 'DiffsClear', { default = true, fg = normal.fg or 0xc0c0c0 })
-  vim.api.nvim_set_hl(0, 'DiffsAdd', { default = true, bg = blended_add })
-  vim.api.nvim_set_hl(0, 'DiffsDelete', { default = true, bg = blended_del })
-  vim.api.nvim_set_hl(0, 'DiffsAddNr', { default = true, fg = blended_add_text, bg = blended_add })
-  vim.api.nvim_set_hl(
-    0,
-    'DiffsDeleteNr',
-    { default = true, fg = blended_del_text, bg = blended_del }
-  )
-  vim.api.nvim_set_hl(0, 'DiffsAddText', { default = true, bg = blended_add_text })
-  vim.api.nvim_set_hl(0, 'DiffsDeleteText', { default = true, bg = blended_del_text })
-
-  dbg('highlight groups: Normal.bg=#%06x DiffAdd.bg=#%06x diffAdded.fg=#%06x', bg, add_bg, add_fg)
-  dbg(
-    'DiffsAdd.bg=#%06x DiffsAddText.bg=#%06x DiffsAddNr.fg=#%06x',
-    blended_add,
-    blended_add_text,
-    add_fg
-  )
-  dbg('DiffsDelete.bg=#%06x DiffsDeleteText.bg=#%06x', blended_del, blended_del_text)
-
-  local diff_change = resolve_hl('DiffChange')
-  local diff_text = resolve_hl('DiffText')
-
-  vim.api.nvim_set_hl(0, 'DiffsDiffAdd', { default = true, bg = diff_add.bg })
-  vim.api.nvim_set_hl(
-    0,
-    'DiffsDiffDelete',
-    { default = true, fg = diff_delete.fg, bg = diff_delete.bg }
-  )
-  vim.api.nvim_set_hl(0, 'DiffsDiffChange', { default = true, bg = diff_change.bg })
-  vim.api.nvim_set_hl(0, 'DiffsDiffText', { default = true, bg = diff_text.bg })
-
-  local change_bg = diff_change.bg or 0x3a3a4a
-  local text_bg = diff_text.bg or 0x4a4a5a
-  local change_fg = diff_change.fg or diff_text.fg or 0x80a0c0
-
-  local blended_ours = blend_color(add_bg, bg, 0.4)
-  local blended_theirs = blend_color(change_bg, bg, 0.4)
-  local blended_base = blend_color(text_bg, bg, 0.3)
-  local blended_ours_nr = blend_color(add_fg, bg, alpha)
-  local blended_theirs_nr = blend_color(change_fg, bg, alpha)
-  local blended_base_nr = blend_color(change_fg, bg, 0.4)
-
-  vim.api.nvim_set_hl(0, 'DiffsConflictOurs', { default = true, bg = blended_ours })
-  vim.api.nvim_set_hl(0, 'DiffsConflictTheirs', { default = true, bg = blended_theirs })
-  vim.api.nvim_set_hl(0, 'DiffsConflictBase', { default = true, bg = blended_base })
-  vim.api.nvim_set_hl(0, 'DiffsConflictMarker', { default = true, fg = 0x808080, bold = true })
-  vim.api.nvim_set_hl(
-    0,
-    'DiffsConflictOursNr',
-    { default = true, fg = blended_ours_nr, bg = blended_ours }
-  )
-  vim.api.nvim_set_hl(
-    0,
-    'DiffsConflictTheirsNr',
-    { default = true, fg = blended_theirs_nr, bg = blended_theirs }
-  )
-  vim.api.nvim_set_hl(
-    0,
-    'DiffsConflictBaseNr',
-    { default = true, fg = blended_base_nr, bg = blended_base }
-  )
-
-  if config.highlights.overrides then
-    for group, hl in pairs(config.highlights.overrides) do
-      vim.api.nvim_set_hl(0, group, hl)
-    end
-  end
-end
-
-local function init()
-  if initialized then
-    return
-  end
-  initialized = true
-
-  local opts = vim.g.diffs or {}
-
-  vim.validate({
-    debug = { opts.debug, 'boolean', true },
-    debounce_ms = { opts.debounce_ms, 'number', true },
-    hide_prefix = { opts.hide_prefix, 'boolean', true },
-    highlights = { opts.highlights, 'table', true },
-  })
-
-  if opts.highlights then
-    vim.validate({
-      ['highlights.background'] = { opts.highlights.background, 'boolean', true },
-      ['highlights.gutter'] = { opts.highlights.gutter, 'boolean', true },
-      ['highlights.blend_alpha'] = { opts.highlights.blend_alpha, 'number', true },
-      ['highlights.overrides'] = { opts.highlights.overrides, 'table', true },
-      ['highlights.context'] = { opts.highlights.context, 'table', true },
-      ['highlights.treesitter'] = { opts.highlights.treesitter, 'table', true },
-      ['highlights.vim'] = { opts.highlights.vim, 'table', true },
-      ['highlights.intra'] = { opts.highlights.intra, 'table', true },
-    })
-
-    if opts.highlights.context then
-      vim.validate({
-        ['highlights.context.enabled'] = { opts.highlights.context.enabled, 'boolean', true },
-        ['highlights.context.lines'] = { opts.highlights.context.lines, 'number', true },
-      })
-    end
-
-    if opts.highlights.treesitter then
-      vim.validate({
-        ['highlights.treesitter.enabled'] = { opts.highlights.treesitter.enabled, 'boolean', true },
-        ['highlights.treesitter.max_lines'] = {
-          opts.highlights.treesitter.max_lines,
-          'number',
-          true,
-        },
-      })
-    end
-
-    if opts.highlights.vim then
-      vim.validate({
-        ['highlights.vim.enabled'] = { opts.highlights.vim.enabled, 'boolean', true },
-        ['highlights.vim.max_lines'] = { opts.highlights.vim.max_lines, 'number', true },
-      })
-    end
-
-    if opts.highlights.intra then
-      vim.validate({
-        ['highlights.intra.enabled'] = { opts.highlights.intra.enabled, 'boolean', true },
-        ['highlights.intra.algorithm'] = {
-          opts.highlights.intra.algorithm,
-          function(v)
-            return v == nil or v == 'default' or v == 'vscode'
-          end,
-          "'default' or 'vscode'",
-        },
-        ['highlights.intra.max_lines'] = { opts.highlights.intra.max_lines, 'number', true },
-      })
-    end
-  end
-
-  if opts.fugitive then
-    vim.validate({
-      ['fugitive.horizontal'] = {
-        opts.fugitive.horizontal,
-        function(v)
-          return v == false or type(v) == 'string'
-        end,
-        'string or false',
-      },
-      ['fugitive.vertical'] = {
-        opts.fugitive.vertical,
-        function(v)
-          return v == false or type(v) == 'string'
-        end,
-        'string or false',
-      },
-    })
-  end
-
-  if opts.conflict then
-    vim.validate({
-      ['conflict.enabled'] = { opts.conflict.enabled, 'boolean', true },
-      ['conflict.disable_diagnostics'] = { opts.conflict.disable_diagnostics, 'boolean', true },
-      ['conflict.show_virtual_text'] = { opts.conflict.show_virtual_text, 'boolean', true },
-      ['conflict.keymaps'] = { opts.conflict.keymaps, 'table', true },
-    })
-
-    if opts.conflict.keymaps then
-      local keymap_validator = function(v)
-        return v == false or type(v) == 'string'
-      end
-      for _, key in ipairs({ 'ours', 'theirs', 'both', 'none', 'next', 'prev' }) do
-        vim.validate({
-          ['conflict.keymaps.' .. key] = {
-            opts.conflict.keymaps[key],
-            keymap_validator,
-            'string or false',
-          },
-        })
-      end
-    end
-  end
-
-  if opts.debounce_ms and opts.debounce_ms < 0 then
-    error('diffs: debounce_ms must be >= 0')
-  end
-  if
-    opts.highlights
-    and opts.highlights.context
-    and opts.highlights.context.lines
-    and opts.highlights.context.lines < 0
-  then
-    error('diffs: highlights.context.lines must be >= 0')
-  end
-  if
-    opts.highlights
-    and opts.highlights.treesitter
-    and opts.highlights.treesitter.max_lines
-    and opts.highlights.treesitter.max_lines < 1
-  then
-    error('diffs: highlights.treesitter.max_lines must be >= 1')
-  end
-  if
-    opts.highlights
-    and opts.highlights.vim
-    and opts.highlights.vim.max_lines
-    and opts.highlights.vim.max_lines < 1
-  then
-    error('diffs: highlights.vim.max_lines must be >= 1')
-  end
-  if
-    opts.highlights
-    and opts.highlights.intra
-    and opts.highlights.intra.max_lines
-    and opts.highlights.intra.max_lines < 1
-  then
-    error('diffs: highlights.intra.max_lines must be >= 1')
-  end
-  if
-    opts.highlights
-    and opts.highlights.blend_alpha
-    and (opts.highlights.blend_alpha < 0 or opts.highlights.blend_alpha > 1)
-  then
-    error('diffs: highlights.blend_alpha must be >= 0 and <= 1')
-  end
-
-  config = vim.tbl_deep_extend('force', default_config, opts)
-  log.set_enabled(config.debug)
-
-  compute_highlight_groups()
-
-  vim.api.nvim_create_autocmd('ColorScheme', {
-    callback = function()
-      compute_highlight_groups()
-      for bufnr, _ in pairs(attached_buffers) do
-        highlight_buffer(bufnr)
-      end
-    end,
-  })
-
-  vim.api.nvim_create_autocmd('WinClosed', {
-    callback = function(args)
-      local win = tonumber(args.match)
-      if win and diff_windows[win] then
-        diff_windows[win] = nil
-      end
-    end,
-  })
-end
-
 ---@param bufnr? integer
 function M.attach(bufnr)
-  init()
   bufnr = bufnr or vim.api.nvim_get_current_buf()
 
   if attached_buffers[bufnr] then
@@ -525,6 +204,36 @@ function M.refresh(bufnr)
   highlight_buffer(bufnr)
 end
 
+local function compute_highlight_groups()
+  local normal = vim.api.nvim_get_hl(0, { name = 'Normal' })
+  local diff_add = vim.api.nvim_get_hl(0, { name = 'DiffAdd' })
+  local diff_delete = vim.api.nvim_get_hl(0, { name = 'DiffDelete' })
+  local diff_added = resolve_hl('diffAdded')
+  local diff_removed = resolve_hl('diffRemoved')
+
+  local bg = normal.bg or 0x1e1e2e
+  local add_bg = diff_add.bg or 0x2e4a3a
+  local del_bg = diff_delete.bg or 0x4a2e3a
+  local add_fg = diff_added.fg or diff_add.fg or 0x80c080
+  local del_fg = diff_removed.fg or diff_delete.fg or 0xc08080
+
+  local blended_add = blend_color(add_bg, bg, 0.4)
+  local blended_del = blend_color(del_bg, bg, 0.4)
+
+  vim.api.nvim_set_hl(0, 'DiffsAdd', { default = true, bg = blended_add })
+  vim.api.nvim_set_hl(0, 'DiffsDelete', { default = true, bg = blended_del })
+  vim.api.nvim_set_hl(0, 'DiffsAddNr', { default = true, fg = add_fg, bg = blended_add })
+  vim.api.nvim_set_hl(0, 'DiffsDeleteNr', { default = true, fg = del_fg, bg = blended_del })
+
+  local diff_change = resolve_hl('DiffChange')
+  local diff_text = resolve_hl('DiffText')
+
+  vim.api.nvim_set_hl(0, 'DiffsDiffAdd', { bg = diff_add.bg })
+  vim.api.nvim_set_hl(0, 'DiffsDiffDelete', { fg = diff_delete.fg, bg = diff_delete.bg })
+  vim.api.nvim_set_hl(0, 'DiffsDiffChange', { bg = diff_change.bg })
+  vim.api.nvim_set_hl(0, 'DiffsDiffText', { bg = diff_text.bg })
+end
+
 local DIFF_WINHIGHLIGHT = table.concat({
   'DiffAdd:DiffsDiffAdd',
   'DiffDelete:DiffsDiffDelete',
@@ -533,7 +242,10 @@ local DIFF_WINHIGHLIGHT = table.concat({
 }, ',')
 
 function M.attach_diff()
-  init()
+  if not config.enabled then
+    return
+  end
+
   local tabpage = vim.api.nvim_get_current_tabpage()
   local wins = vim.api.nvim_tabpage_list_wins(tabpage)
 
@@ -565,16 +277,73 @@ function M.detach_diff()
   end
 end
 
----@return diffs.FugitiveConfig
-function M.get_fugitive_config()
-  init()
-  return config.fugitive
-end
+---@param opts? diffs.Config
+function M.setup(opts)
+  opts = opts or {}
 
----@return diffs.ConflictConfig
-function M.get_conflict_config()
-  init()
-  return config.conflict
+  vim.validate({
+    enabled = { opts.enabled, 'boolean', true },
+    debug = { opts.debug, 'boolean', true },
+    debounce_ms = { opts.debounce_ms, 'number', true },
+    hide_prefix = { opts.hide_prefix, 'boolean', true },
+    treesitter = { opts.treesitter, 'table', true },
+    vim = { opts.vim, 'table', true },
+    highlights = { opts.highlights, 'table', true },
+  })
+
+  if opts.treesitter then
+    vim.validate({
+      ['treesitter.enabled'] = { opts.treesitter.enabled, 'boolean', true },
+      ['treesitter.max_lines'] = { opts.treesitter.max_lines, 'number', true },
+    })
+  end
+
+  if opts.vim then
+    vim.validate({
+      ['vim.enabled'] = { opts.vim.enabled, 'boolean', true },
+      ['vim.max_lines'] = { opts.vim.max_lines, 'number', true },
+    })
+  end
+
+  if opts.highlights then
+    vim.validate({
+      ['highlights.background'] = { opts.highlights.background, 'boolean', true },
+      ['highlights.gutter'] = { opts.highlights.gutter, 'boolean', true },
+    })
+  end
+
+  if opts.debounce_ms and opts.debounce_ms < 0 then
+    error('diffs: debounce_ms must be >= 0')
+  end
+  if opts.treesitter and opts.treesitter.max_lines and opts.treesitter.max_lines < 1 then
+    error('diffs: treesitter.max_lines must be >= 1')
+  end
+  if opts.vim and opts.vim.max_lines and opts.vim.max_lines < 1 then
+    error('diffs: vim.max_lines must be >= 1')
+  end
+
+  config = vim.tbl_deep_extend('force', default_config, opts)
+  log.set_enabled(config.debug)
+
+  compute_highlight_groups()
+
+  vim.api.nvim_create_autocmd('ColorScheme', {
+    callback = function()
+      compute_highlight_groups()
+      for bufnr, _ in pairs(attached_buffers) do
+        highlight_buffer(bufnr)
+      end
+    end,
+  })
+
+  vim.api.nvim_create_autocmd('WinClosed', {
+    callback = function(args)
+      local win = tonumber(args.match)
+      if win and diff_windows[win] then
+        diff_windows[win] = nil
+      end
+    end,
+  })
 end
 
 return M

lua/diffs/lib.lua

@@ -1,214 +0,0 @@
-local M = {}
-
-local dbg = require('diffs.log').dbg
-
----@type table?
-local cached_handle = nil
-
----@type boolean
-local download_in_progress = false
-
----@return string
-local function get_os()
-  local os_name = jit.os:lower()
-  if os_name == 'osx' then
-    return 'macos'
-  end
-  return os_name
-end
-
----@return string
-local function get_arch()
-  return jit.arch:lower()
-end
-
----@return string
-local function get_ext()
-  local os_name = jit.os:lower()
-  if os_name == 'windows' then
-    return 'dll'
-  elseif os_name == 'osx' then
-    return 'dylib'
-  end
-  return 'so'
-end
-
----@return string
-local function lib_dir()
-  return vim.fn.stdpath('data') .. '/diffs/lib'
-end
-
----@return string
-local function lib_path()
-  return lib_dir() .. '/libvscode_diff.' .. get_ext()
-end
-
----@return string
-local function version_path()
-  return lib_dir() .. '/version'
-end
-
-local EXPECTED_VERSION = '2.18.0'
-
----@return boolean
-function M.has_lib()
-  if cached_handle then
-    return true
-  end
-  return vim.fn.filereadable(lib_path()) == 1
-end
-
----@return string
-function M.lib_path()
-  return lib_path()
-end
-
----@return table?
-function M.load()
-  if cached_handle then
-    return cached_handle
-  end
-
-  local path = lib_path()
-  if vim.fn.filereadable(path) ~= 1 then
-    return nil
-  end
-
-  local ffi = require('ffi')
-
-  ffi.cdef([[
-    typedef struct {
-      int start_line;
-      int end_line;
-    } DiffsLineRange;
-
-    typedef struct {
-      int start_line;
-      int start_col;
-      int end_line;
-      int end_col;
-    } DiffsCharRange;
-
-    typedef struct {
-      DiffsCharRange original;
-      DiffsCharRange modified;
-    } DiffsRangeMapping;
-
-    typedef struct {
-      DiffsLineRange original;
-      DiffsLineRange modified;
-      DiffsRangeMapping* inner_changes;
-      int inner_change_count;
-    } DiffsDetailedMapping;
-
-    typedef struct {
-      DiffsDetailedMapping* mappings;
-      int count;
-      int capacity;
-    } DiffsDetailedMappingArray;
-
-    typedef struct {
-      DiffsLineRange original;
-      DiffsLineRange modified;
-    } DiffsMovedText;
-
-    typedef struct {
-      DiffsMovedText* moves;
-      int count;
-      int capacity;
-    } DiffsMovedTextArray;
-
-    typedef struct {
-      DiffsDetailedMappingArray changes;
-      DiffsMovedTextArray moves;
-      bool hit_timeout;
-    } DiffsLinesDiff;
-
-    typedef struct {
-      bool ignore_trim_whitespace;
-      int max_computation_time_ms;
-      bool compute_moves;
-      bool extend_to_subwords;
-    } DiffsDiffOptions;
-
-    DiffsLinesDiff* compute_diff(
-      const char** original_lines,
-      int original_count,
-      const char** modified_lines,
-      int modified_count,
-      const DiffsDiffOptions* options
-    );
-
-    void free_lines_diff(DiffsLinesDiff* diff);
-  ]])
-
-  local ok, handle = pcall(ffi.load, path)
-  if not ok then
-    dbg('failed to load libvscode_diff: %s', handle)
-    return nil
-  end
-
-  cached_handle = handle
-  return handle
-end
-
----@param callback fun(handle: table?)
-function M.ensure(callback)
-  if cached_handle then
-    callback(cached_handle)
-    return
-  end
-
-  if M.has_lib() then
-    callback(M.load())
-    return
-  end
-
-  if download_in_progress then
-    dbg('download already in progress')
-    callback(nil)
-    return
-  end
-
-  download_in_progress = true
-
-  local dir = lib_dir()
-  vim.fn.mkdir(dir, 'p')
-
-  local os_name = get_os()
-  local arch = get_arch()
-  local ext = get_ext()
-  local filename = ('libvscode_diff_%s_%s_%s.%s'):format(os_name, arch, EXPECTED_VERSION, ext)
-  local url = ('https://github.com/esmuellert/vscode-diff.nvim/releases/download/v%s/%s'):format(
-    EXPECTED_VERSION,
-    filename
-  )
-
-  local dest = lib_path()
-  vim.notify('[diffs] downloading libvscode_diff...', vim.log.levels.INFO)
-
-  local cmd = { 'curl', '-fSL', '-o', dest, url }
-
-  vim.system(cmd, {}, function(result)
-    download_in_progress = false
-    vim.schedule(function()
-      if result.code ~= 0 then
-        vim.notify('[diffs] failed to download libvscode_diff', vim.log.levels.WARN)
-        dbg('curl failed: %s', result.stderr or '')
-        callback(nil)
-        return
-      end
-
-      local f = io.open(version_path(), 'w')
-      if f then
-        f:write(EXPECTED_VERSION)
-        f:close()
-      end
-
-      vim.notify('[diffs] libvscode_diff downloaded', vim.log.levels.INFO)
-      callback(M.load())
-    end)
-  end)
-end
-
-return M

lua/diffs/log.lua

@@ -13,7 +13,7 @@ function M.dbg(msg, ...)
   if not enabled then
     return
   end
-  vim.notify('[diffs.nvim]: ' .. string.format(msg, ...), vim.log.levels.DEBUG)
+  vim.notify('[diffs] ' .. string.format(msg, ...), vim.log.levels.DEBUG)
 end
 
 return M

lua/diffs/parser.lua

@@ -6,75 +6,19 @@
 ---@field header_context string?
 ---@field header_context_col integer?
 ---@field lines string[]
----@field header_start_line integer?
----@field header_lines string[]?
----@field file_old_start integer?
----@field file_old_count integer?
----@field file_new_start integer?
----@field file_new_count integer?
----@field repo_root string?
 
 local M = {}
 
 local dbg = require('diffs.log').dbg
 
----@param filepath string
----@param n integer
----@return string[]?
-local function read_first_lines(filepath, n)
-  local f = io.open(filepath, 'r')
-  if not f then
-    return nil
-  end
-  local lines = {}
-  for _ = 1, n do
-    local line = f:read('*l')
-    if not line then
-      break
-    end
-    table.insert(lines, line)
-  end
-  f:close()
-  return #lines > 0 and lines or nil
-end
-
 ---@param filename string
----@param repo_root string?
 ---@return string?
-local function get_ft_from_filename(filename, repo_root)
-  if repo_root then
-    local full_path = vim.fs.joinpath(repo_root, filename)
-
-    local buf = vim.fn.bufnr(full_path)
-    if buf ~= -1 then
-      local ft = vim.api.nvim_get_option_value('filetype', { buf = buf })
-      if ft and ft ~= '' then
-        dbg('filetype from existing buffer %d: %s', buf, ft)
-        return ft
-      end
-    end
-  end
-
+local function get_ft_from_filename(filename)
   local ft = vim.filetype.match({ filename = filename })
-  if ft then
-    dbg('filetype from filename: %s', ft)
-    return ft
+  if not ft then
+    dbg('no filetype for: %s', filename)
   end
-
-  if repo_root then
-    local full_path = vim.fs.joinpath(repo_root, filename)
-    local contents = read_first_lines(full_path, 10)
-    if contents then
-      ft = vim.filetype.match({ filename = filename, contents = contents })
-      if ft then
-        dbg('filetype from file content: %s', ft)
-        return ft
-      end
-    end
-  end
-
-  dbg('no filetype for: %s', filename)
-  return nil
+  return ft
 end
 
 ---@param ft string
@@ -93,27 +37,10 @@ local function get_lang_from_ft(ft)
   return nil
 end
 
----@param bufnr integer
----@return string?
-local function get_repo_root(bufnr)
-  local ok, repo_root = pcall(vim.api.nvim_buf_get_var, bufnr, 'diffs_repo_root')
-  if ok and repo_root then
-    return repo_root
-  end
-
-  local ok2, git_dir = pcall(vim.api.nvim_buf_get_var, bufnr, 'git_dir')
-  if ok2 and git_dir then
-    return vim.fn.fnamemodify(git_dir, ':h')
-  end
-
-  return nil
-end
-
 ---@param bufnr integer
 ---@return diffs.Hunk[]
 function M.parse_buffer(bufnr)
   local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-  local repo_root = get_repo_root(bufnr)
   ---@type diffs.Hunk[]
   local hunks = {}
 
@@ -131,24 +58,10 @@ function M.parse_buffer(bufnr)
   local hunk_header_context_col = nil
   ---@type string[]
   local hunk_lines = {}
-  ---@type integer?
-  local hunk_count = nil
-  ---@type integer?
-  local header_start = nil
-  ---@type string[]
-  local header_lines = {}
-  ---@type integer?
-  local file_old_start = nil
-  ---@type integer?
-  local file_old_count = nil
-  ---@type integer?
-  local file_new_start = nil
-  ---@type integer?
-  local file_new_count = nil
 
   local function flush_hunk()
-    if hunk_start and #hunk_lines > 0 then
-      local hunk = {
+    if hunk_start and #hunk_lines > 0 and (current_lang or current_ft) then
+      table.insert(hunks, {
         filename = current_filename,
         ft = current_ft,
         lang = current_lang,
@@ -156,26 +69,12 @@ function M.parse_buffer(bufnr)
         header_context = hunk_header_context,
         header_context_col = hunk_header_context_col,
         lines = hunk_lines,
-        file_old_start = file_old_start,
-        file_old_count = file_old_count,
-        file_new_start = file_new_start,
-        file_new_count = file_new_count,
-        repo_root = repo_root,
-      }
-      if hunk_count == 1 and header_start and #header_lines > 0 then
-        hunk.header_start_line = header_start
-        hunk.header_lines = header_lines
-      end
-      table.insert(hunks, hunk)
+      })
     end
     hunk_start = nil
     hunk_header_context = nil
     hunk_header_context_col = nil
     hunk_lines = {}
-    file_old_start = nil
-    file_old_count = nil
-    file_new_start = nil
-    file_new_count = nil
   end
 
   for i, line in ipairs(lines) do
@@ -183,34 +82,21 @@ function M.parse_buffer(bufnr)
     if filename then
       flush_hunk()
       current_filename = filename
-      current_ft = get_ft_from_filename(filename, repo_root)
+      current_ft = get_ft_from_filename(filename)
       current_lang = current_ft and get_lang_from_ft(current_ft) or nil
       if current_lang then
         dbg('file: %s -> lang: %s', filename, current_lang)
       elseif current_ft then
         dbg('file: %s -> ft: %s (no ts parser)', filename, current_ft)
       end
-      hunk_count = 0
-      header_start = i
-      header_lines = {}
     elseif line:match('^@@.-@@') then
       flush_hunk()
       hunk_start = i
-      local hs, hc, hs2, hc2 = line:match('^@@ %-(%d+),?(%d*) %+(%d+),?(%d*) @@')
-      if hs then
-        file_old_start = tonumber(hs)
-        file_old_count = tonumber(hc) or 1
-        file_new_start = tonumber(hs2)
-        file_new_count = tonumber(hc2) or 1
-      end
       local prefix, context = line:match('^(@@.-@@%s*)(.*)')
       if context and context ~= '' then
         hunk_header_context = context
         hunk_header_context_col = #prefix
       end
-      if hunk_count then
-        hunk_count = hunk_count + 1
-      end
     elseif hunk_start then
       local prefix = line:sub(1, 1)
       if prefix == ' ' or prefix == '+' or prefix == '-' then
@@ -226,12 +112,8 @@ function M.parse_buffer(bufnr)
         current_filename = nil
         current_ft = nil
         current_lang = nil
-        header_start = nil
       end
     end
-    if header_start and not hunk_start then
-      table.insert(header_lines, line)
-    end
   end
 
   flush_hunk()

plugin/diffs.lua

@@ -3,8 +3,6 @@ if vim.g.loaded_diffs then
 end
 vim.g.loaded_diffs = 1
 
-require('diffs.commands').setup()
-
 vim.api.nvim_create_autocmd('FileType', {
   pattern = { 'fugitive', 'git' },
   callback = function(args)
@@ -13,29 +11,6 @@ vim.api.nvim_create_autocmd('FileType', {
       return
     end
     diffs.attach(args.buf)
-
-    if args.match == 'fugitive' then
-      local fugitive_config = diffs.get_fugitive_config()
-      if fugitive_config.horizontal or fugitive_config.vertical then
-        require('diffs.fugitive').setup_keymaps(args.buf, fugitive_config)
-      end
-    end
-  end,
-})
-
-vim.api.nvim_create_autocmd('BufReadCmd', {
-  pattern = 'diffs://*',
-  callback = function(args)
-    require('diffs.commands').read_buffer(args.buf)
-  end,
-})
-
-vim.api.nvim_create_autocmd('BufReadPost', {
-  callback = function(args)
-    local conflict_config = require('diffs').get_conflict_config()
-    if conflict_config.enabled then
-      require('diffs.conflict').attach(args.buf, conflict_config)
-    end
   end,
 })
 
@@ -49,36 +24,3 @@ vim.api.nvim_create_autocmd('OptionSet', {
     end
   end,
 })
-
-local cmds = require('diffs.commands')
-vim.keymap.set('n', '<Plug>(diffs-gdiff)', function()
-  cmds.gdiff(nil, false)
-end, { desc = 'Unified diff (horizontal)' })
-vim.keymap.set('n', '<Plug>(diffs-gvdiff)', function()
-  cmds.gdiff(nil, true)
-end, { desc = 'Unified diff (vertical)' })
-
-local function conflict_action(fn)
-  local bufnr = vim.api.nvim_get_current_buf()
-  local config = require('diffs').get_conflict_config()
-  fn(bufnr, config)
-end
-
-vim.keymap.set('n', '<Plug>(diffs-conflict-ours)', function()
-  conflict_action(require('diffs.conflict').resolve_ours)
-end, { desc = 'Accept current (ours) change' })
-vim.keymap.set('n', '<Plug>(diffs-conflict-theirs)', function()
-  conflict_action(require('diffs.conflict').resolve_theirs)
-end, { desc = 'Accept incoming (theirs) change' })
-vim.keymap.set('n', '<Plug>(diffs-conflict-both)', function()
-  conflict_action(require('diffs.conflict').resolve_both)
-end, { desc = 'Accept both changes' })
-vim.keymap.set('n', '<Plug>(diffs-conflict-none)', function()
-  conflict_action(require('diffs.conflict').resolve_none)
-end, { desc = 'Reject both changes' })
-vim.keymap.set('n', '<Plug>(diffs-conflict-next)', function()
-  require('diffs.conflict').goto_next(vim.api.nvim_get_current_buf())
-end, { desc = 'Jump to next conflict' })
-vim.keymap.set('n', '<Plug>(diffs-conflict-prev)', function()
-  require('diffs.conflict').goto_prev(vim.api.nvim_get_current_buf())
-end, { desc = 'Jump to previous conflict' })

scripts/ci.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[0;33m'
+BOLD='\033[1m'
+RESET='\033[0m'
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+cd "$ROOT_DIR"
+
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+
+run_job() {
+  local name=$1
+  shift
+  local log="$tmpdir/$name.log"
+  if "$@" >"$log" 2>&1; then
+    echo -e "${GREEN}✓${RESET} $name"
+    return 0
+  else
+    echo -e "${RED}✗${RESET} $name"
+    cat "$log"
+    return 1
+  fi
+}
+
+echo -e "${BOLD}Running CI jobs in parallel...${RESET}"
+echo
+
+pids=()
+jobs_names=()
+
+run_job "stylua" stylua --check . &
+pids+=($!); jobs_names+=("stylua")
+
+run_job "selene" selene --display-style quiet . &
+pids+=($!); jobs_names+=("selene")
+
+run_job "prettier" prettier --check . &
+pids+=($!); jobs_names+=("prettier")
+
+run_job "busted" env \
+  LUA_PATH="/usr/share/lua/5.1/?.lua;/usr/share/lua/5.1/?/init.lua;/usr/lib/lua/5.1/?.lua;/usr/lib/lua/5.1/?/init.lua;;" \
+  LUA_CPATH="/usr/lib/lua/5.1/?.so;;" \
+  nvim -l /usr/lib/luarocks/rocks-5.1/busted/2.3.0-1/bin/busted --verbose spec/ &
+pids+=($!); jobs_names+=("busted")
+
+failed=0
+for i in "${!pids[@]}"; do
+  if ! wait "${pids[$i]}"; then
+    failed=1
+  fi
+done
+
+echo
+if [ "$failed" -eq 0 ]; then
+  echo -e "${GREEN}${BOLD}All jobs passed.${RESET}"
+else
+  echo -e "${RED}${BOLD}Some jobs failed.${RESET}"
+  exit 1
+fi

spec/commands_spec.lua

@@ -1,98 +0,0 @@
-require('spec.helpers')
-
-local commands = require('diffs.commands')
-
-describe('commands', function()
-  describe('setup', function()
-    it('registers Gdiff, Gvdiff, and Ghdiff commands', function()
-      commands.setup()
-      local cmds = vim.api.nvim_get_commands({})
-      assert.is_not_nil(cmds.Gdiff)
-      assert.is_not_nil(cmds.Gvdiff)
-      assert.is_not_nil(cmds.Ghdiff)
-    end)
-  end)
-
-  describe('unified diff generation', function()
-    local old_lines = { 'local M = {}', 'return M' }
-    local new_lines = { 'local M = {}', 'local x = 1', 'return M' }
-    local diff_fn = vim.text and vim.text.diff or vim.diff
-
-    it('generates valid unified diff', function()
-      local old_content = table.concat(old_lines, '\n')
-      local new_content = table.concat(new_lines, '\n')
-      local diff_output = diff_fn(old_content, new_content, {
-        result_type = 'unified',
-        ctxlen = 3,
-      })
-      assert.is_not_nil(diff_output)
-      assert.is_true(diff_output:find('@@ ') ~= nil)
-      assert.is_true(diff_output:find('+local x = 1') ~= nil)
-    end)
-
-    it('returns empty for identical content', function()
-      local content = table.concat(old_lines, '\n')
-      local diff_output = diff_fn(content, content, {
-        result_type = 'unified',
-        ctxlen = 3,
-      })
-      assert.are.equal('', diff_output)
-    end)
-  end)
-
-  describe('find_hunk_line', function()
-    it('finds matching @@ header and returns target line', function()
-      local diff_lines = {
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      }
-      local hunk_position = {
-        hunk_header = '@@ -1,3 +1,4 @@',
-        offset = 2,
-      }
-      local target_line = commands.find_hunk_line(diff_lines, hunk_position)
-      assert.equals(6, target_line)
-    end)
-
-    it('returns nil when hunk header not found', function()
-      local diff_lines = {
-        'diff --git a/file.lua b/file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-      }
-      local hunk_position = {
-        hunk_header = '@@ -99,3 +99,4 @@',
-        offset = 1,
-      }
-      local target_line = commands.find_hunk_line(diff_lines, hunk_position)
-      assert.is_nil(target_line)
-    end)
-
-    it('handles multiple hunks and finds correct one', function()
-      local diff_lines = {
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local x = 1',
-        ' ',
-        '@@ -10,3 +11,4 @@',
-        ' function M.foo()',
-        '+  print("hello")',
-        ' end',
-      }
-      local hunk_position = {
-        hunk_header = '@@ -10,3 +11,4 @@',
-        offset = 2,
-      }
-      local target_line = commands.find_hunk_line(diff_lines, hunk_position)
-      assert.equals(10, target_line)
-    end)
-  end)
-end)

spec/conflict_spec.lua

@@ -1,688 +0,0 @@
-local conflict = require('diffs.conflict')
-local helpers = require('spec.helpers')
-
-local function default_config(overrides)
-  local cfg = {
-    enabled = true,
-    disable_diagnostics = false,
-    show_virtual_text = true,
-    keymaps = {
-      ours = 'doo',
-      theirs = 'dot',
-      both = 'dob',
-      none = 'don',
-      next = ']x',
-      prev = '[x',
-    },
-  }
-  if overrides then
-    cfg = vim.tbl_deep_extend('force', cfg, overrides)
-  end
-  return cfg
-end
-
-local function create_file_buffer(lines)
-  local bufnr = vim.api.nvim_create_buf(false, false)
-  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines or {})
-  return bufnr
-end
-
-local function get_extmarks(bufnr)
-  return vim.api.nvim_buf_get_extmarks(bufnr, conflict.get_namespace(), 0, -1, { details = true })
-end
-
-describe('conflict', function()
-  describe('parse', function()
-    it('parses a single conflict', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-      assert.are.equal(0, regions[1].marker_ours)
-      assert.are.equal(1, regions[1].ours_start)
-      assert.are.equal(2, regions[1].ours_end)
-      assert.are.equal(2, regions[1].marker_sep)
-      assert.are.equal(3, regions[1].theirs_start)
-      assert.are.equal(4, regions[1].theirs_end)
-      assert.are.equal(4, regions[1].marker_theirs)
-    end)
-
-    it('parses multiple conflicts', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-        'normal line',
-        '<<<<<<< HEAD',
-        'c',
-        '=======',
-        'd',
-        '>>>>>>> feat',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(2, #regions)
-      assert.are.equal(0, regions[1].marker_ours)
-      assert.are.equal(6, regions[2].marker_ours)
-    end)
-
-    it('parses diff3 format', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '||||||| base',
-        'local x = 0',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-      assert.are.equal(2, regions[1].marker_base)
-      assert.are.equal(3, regions[1].base_start)
-      assert.are.equal(4, regions[1].base_end)
-    end)
-
-    it('handles empty ours section', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-      assert.are.equal(1, regions[1].ours_start)
-      assert.are.equal(1, regions[1].ours_end)
-    end)
-
-    it('handles empty theirs section', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-      assert.are.equal(3, regions[1].theirs_start)
-      assert.are.equal(3, regions[1].theirs_end)
-    end)
-
-    it('returns empty for no markers', function()
-      local lines = { 'local x = 1', 'local y = 2' }
-      local regions = conflict.parse(lines)
-      assert.are.equal(0, #regions)
-    end)
-
-    it('discards malformed markers (no separator)', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(0, #regions)
-    end)
-
-    it('discards malformed markers (no end)', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(0, #regions)
-    end)
-
-    it('handles trailing text on marker lines', function()
-      local lines = {
-        '<<<<<<< HEAD (some text)',
-        'local x = 1',
-        '======= extra',
-        'local x = 2',
-        '>>>>>>> feature-branch/some-thing',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-    end)
-
-    it('handles empty base in diff3', function()
-      local lines = {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '||||||| base',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }
-      local regions = conflict.parse(lines)
-      assert.are.equal(1, #regions)
-      assert.are.equal(3, regions[1].base_start)
-      assert.are.equal(3, regions[1].base_end)
-    end)
-  end)
-
-  describe('highlighting', function()
-    after_each(function()
-      conflict.detach(vim.api.nvim_get_current_buf())
-    end)
-
-    it('applies extmarks for conflict regions', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config())
-
-      local extmarks = get_extmarks(bufnr)
-      assert.is_true(#extmarks > 0)
-
-      local has_ours = false
-      local has_theirs = false
-      local has_marker = false
-      for _, mark in ipairs(extmarks) do
-        local hl = mark[4] and mark[4].hl_group
-        if hl == 'DiffsConflictOurs' then
-          has_ours = true
-        end
-        if hl == 'DiffsConflictTheirs' then
-          has_theirs = true
-        end
-        if hl == 'DiffsConflictMarker' then
-          has_marker = true
-        end
-      end
-      assert.is_true(has_ours)
-      assert.is_true(has_theirs)
-      assert.is_true(has_marker)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('applies virtual text when enabled', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config({ show_virtual_text = true }))
-
-      local extmarks = get_extmarks(bufnr)
-      local virt_text_count = 0
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          virt_text_count = virt_text_count + 1
-        end
-      end
-      assert.are.equal(2, virt_text_count)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('does not apply virtual text when disabled', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config({ show_virtual_text = false }))
-
-      local extmarks = get_extmarks(bufnr)
-      local virt_text_count = 0
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          virt_text_count = virt_text_count + 1
-        end
-      end
-      assert.are.equal(0, virt_text_count)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('applies number_hl_group to content lines', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config())
-
-      local extmarks = get_extmarks(bufnr)
-      local has_ours_nr = false
-      local has_theirs_nr = false
-      for _, mark in ipairs(extmarks) do
-        local nr = mark[4] and mark[4].number_hl_group
-        if nr == 'DiffsConflictOursNr' then
-          has_ours_nr = true
-        end
-        if nr == 'DiffsConflictTheirsNr' then
-          has_theirs_nr = true
-        end
-      end
-      assert.is_true(has_ours_nr)
-      assert.is_true(has_theirs_nr)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('highlights base region in diff3', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '||||||| base',
-        'local x = 0',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config())
-
-      local extmarks = get_extmarks(bufnr)
-      local has_base = false
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].hl_group == 'DiffsConflictBase' then
-          has_base = true
-          break
-        end
-      end
-      assert.is_true(has_base)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('clears extmarks on detach', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config())
-      assert.is_true(#get_extmarks(bufnr) > 0)
-
-      conflict.detach(bufnr)
-      assert.are.equal(0, #get_extmarks(bufnr))
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
-
-  describe('resolution', function()
-    local function make_conflict_buffer()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      return bufnr
-    end
-
-    it('resolve_ours keeps ours content', function()
-      local bufnr = make_conflict_buffer()
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_ours(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('local x = 1', lines[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('resolve_theirs keeps theirs content', function()
-      local bufnr = make_conflict_buffer()
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_theirs(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('local x = 2', lines[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('resolve_both keeps ours then theirs', function()
-      local bufnr = make_conflict_buffer()
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_both(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(2, #lines)
-      assert.are.equal('local x = 1', lines[1])
-      assert.are.equal('local x = 2', lines[2])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('resolve_none removes entire block', function()
-      local bufnr = make_conflict_buffer()
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_none(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('', lines[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('does nothing when cursor is outside conflict', function()
-      local bufnr = create_file_buffer({
-        'normal line',
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      conflict.resolve_ours(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(6, #lines)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('resolves one conflict among multiple', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-        'middle',
-        '<<<<<<< HEAD',
-        'c',
-        '=======',
-        'd',
-        '>>>>>>> feat',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_ours(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal('a', lines[1])
-      assert.are.equal('middle', lines[2])
-      assert.are.equal('<<<<<<< HEAD', lines[3])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('resolve_ours with empty ours section', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      conflict.resolve_ours(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('', lines[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('handles diff3 resolution (ignores base)', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '||||||| base',
-        'local x = 0',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-
-      conflict.resolve_theirs(bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('local x = 2', lines[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
-
-  describe('navigation', function()
-    it('goto_next jumps to next conflict', function()
-      local bufnr = create_file_buffer({
-        'normal',
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-        'middle',
-        '<<<<<<< HEAD',
-        'c',
-        '=======',
-        'd',
-        '>>>>>>> feat',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      conflict.goto_next(bufnr)
-      assert.are.equal(2, vim.api.nvim_win_get_cursor(0)[1])
-
-      conflict.goto_next(bufnr)
-      assert.are.equal(8, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('goto_next wraps to first conflict', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      conflict.goto_next(bufnr)
-      assert.are.equal(1, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('goto_prev jumps to previous conflict', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-        'middle',
-        '<<<<<<< HEAD',
-        'c',
-        '=======',
-        'd',
-        '>>>>>>> feat',
-        'end',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 12, 0 })
-
-      conflict.goto_prev(bufnr)
-      assert.are.equal(7, vim.api.nvim_win_get_cursor(0)[1])
-
-      conflict.goto_prev(bufnr)
-      assert.are.equal(1, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('goto_prev wraps to last conflict', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      conflict.goto_prev(bufnr)
-      assert.are.equal(1, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('goto_next does nothing with no conflicts', function()
-      local bufnr = create_file_buffer({ 'normal line' })
-      vim.api.nvim_set_current_buf(bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      conflict.goto_next(bufnr)
-      assert.are.equal(1, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
-
-  describe('lifecycle', function()
-    it('attach is idempotent', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-      })
-      local cfg = default_config()
-      conflict.attach(bufnr, cfg)
-      local count1 = #get_extmarks(bufnr)
-      conflict.attach(bufnr, cfg)
-      local count2 = #get_extmarks(bufnr)
-      assert.are.equal(count1, count2)
-      conflict.detach(bufnr)
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('skips non-file buffers', function()
-      local bufnr = helpers.create_buffer({
-        '<<<<<<< HEAD',
-        'a',
-        '=======',
-        'b',
-        '>>>>>>> feat',
-      })
-      vim.api.nvim_set_option_value('buftype', 'nofile', { buf = bufnr })
-
-      conflict.attach(bufnr, default_config())
-      assert.are.equal(0, #get_extmarks(bufnr))
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('skips buffers without conflict markers', function()
-      local bufnr = create_file_buffer({ 'local x = 1', 'local y = 2' })
-
-      conflict.attach(bufnr, default_config())
-      assert.are.equal(0, #get_extmarks(bufnr))
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('re-highlights when markers return after resolution', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      local cfg = default_config()
-      conflict.attach(bufnr, cfg)
-
-      assert.is_true(#get_extmarks(bufnr) > 0)
-
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-      conflict.resolve_ours(bufnr, cfg)
-      assert.are.equal(0, #get_extmarks(bufnr))
-
-      vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, {
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_exec_autocmds('TextChanged', { buffer = bufnr })
-
-      assert.is_true(#get_extmarks(bufnr) > 0)
-
-      conflict.detach(bufnr)
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('detaches after last conflict resolved', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-      vim.api.nvim_set_current_buf(bufnr)
-      conflict.attach(bufnr, default_config())
-
-      assert.is_true(#get_extmarks(bufnr) > 0)
-
-      vim.api.nvim_win_set_cursor(0, { 2, 0 })
-      conflict.resolve_ours(bufnr, default_config())
-
-      assert.are.equal(0, #get_extmarks(bufnr))
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
-end)

spec/diff_spec.lua

@@ -1,163 +0,0 @@
-require('spec.helpers')
-local diff = require('diffs.diff')
-
-describe('diff', function()
-  describe('extract_change_groups', function()
-    it('returns empty for all context lines', function()
-      local groups = diff.extract_change_groups({ ' line1', ' line2', ' line3' })
-      assert.are.equal(0, #groups)
-    end)
-
-    it('returns empty for pure additions', function()
-      local groups = diff.extract_change_groups({ '+line1', '+line2' })
-      assert.are.equal(0, #groups)
-    end)
-
-    it('returns empty for pure deletions', function()
-      local groups = diff.extract_change_groups({ '-line1', '-line2' })
-      assert.are.equal(0, #groups)
-    end)
-
-    it('extracts single change group', function()
-      local groups = diff.extract_change_groups({
-        ' context',
-        '-old line',
-        '+new line',
-        ' context',
-      })
-      assert.are.equal(1, #groups)
-      assert.are.equal(1, #groups[1].del_lines)
-      assert.are.equal(1, #groups[1].add_lines)
-      assert.are.equal('old line', groups[1].del_lines[1].text)
-      assert.are.equal('new line', groups[1].add_lines[1].text)
-    end)
-
-    it('extracts multiple change groups separated by context', function()
-      local groups = diff.extract_change_groups({
-        '-old1',
-        '+new1',
-        ' context',
-        '-old2',
-        '+new2',
-      })
-      assert.are.equal(2, #groups)
-      assert.are.equal('old1', groups[1].del_lines[1].text)
-      assert.are.equal('new1', groups[1].add_lines[1].text)
-      assert.are.equal('old2', groups[2].del_lines[1].text)
-      assert.are.equal('new2', groups[2].add_lines[1].text)
-    end)
-
-    it('tracks correct line indices', function()
-      local groups = diff.extract_change_groups({
-        ' context',
-        '-deleted',
-        '+added',
-      })
-      assert.are.equal(2, groups[1].del_lines[1].idx)
-      assert.are.equal(3, groups[1].add_lines[1].idx)
-    end)
-
-    it('handles multiple del lines followed by multiple add lines', function()
-      local groups = diff.extract_change_groups({
-        '-del1',
-        '-del2',
-        '+add1',
-        '+add2',
-        '+add3',
-      })
-      assert.are.equal(1, #groups)
-      assert.are.equal(2, #groups[1].del_lines)
-      assert.are.equal(3, #groups[1].add_lines)
-    end)
-  end)
-
-  describe('compute_intra_hunks', function()
-    it('returns nil for all-addition hunks', function()
-      local result = diff.compute_intra_hunks({ '+line1', '+line2' }, 'default')
-      assert.is_nil(result)
-    end)
-
-    it('returns nil for all-deletion hunks', function()
-      local result = diff.compute_intra_hunks({ '-line1', '-line2' }, 'default')
-      assert.is_nil(result)
-    end)
-
-    it('returns nil for context-only hunks', function()
-      local result = diff.compute_intra_hunks({ ' line1', ' line2' }, 'default')
-      assert.is_nil(result)
-    end)
-
-    it('returns spans for single word change', function()
-      local result = diff.compute_intra_hunks({
-        '-local x = 1',
-        '+local x = 2',
-      }, 'default')
-      assert.is_not_nil(result)
-      assert.is_true(#result.del_spans > 0)
-      assert.is_true(#result.add_spans > 0)
-    end)
-
-    it('identifies correct byte offsets for word change', function()
-      local result = diff.compute_intra_hunks({
-        '-local x = 1',
-        '+local x = 2',
-      }, 'default')
-      assert.is_not_nil(result)
-
-      assert.are.equal(1, #result.del_spans)
-      assert.are.equal(1, #result.add_spans)
-      local del_span = result.del_spans[1]
-      local add_span = result.add_spans[1]
-      local del_text = ('local x = 1'):sub(del_span.col_start, del_span.col_end - 1)
-      local add_text = ('local x = 2'):sub(add_span.col_start, add_span.col_end - 1)
-      assert.are.equal('1', del_text)
-      assert.are.equal('2', add_text)
-    end)
-
-    it('handles multiple change groups separated by context', function()
-      local result = diff.compute_intra_hunks({
-        '-local a = 1',
-        '+local a = 2',
-        ' local b = 3',
-        '-local c = 4',
-        '+local c = 5',
-      }, 'default')
-      assert.is_not_nil(result)
-      assert.is_true(#result.del_spans >= 2)
-      assert.is_true(#result.add_spans >= 2)
-    end)
-
-    it('handles uneven line counts (2 old, 1 new)', function()
-      local result = diff.compute_intra_hunks({
-        '-line one',
-        '-line two',
-        '+line combined',
-      }, 'default')
-      assert.is_not_nil(result)
-    end)
-
-    it('handles multi-byte UTF-8 content', function()
-      local result = diff.compute_intra_hunks({
-        '-local x = "héllo"',
-        '+local x = "wörld"',
-      }, 'default')
-      assert.is_not_nil(result)
-      assert.is_true(#result.del_spans > 0)
-      assert.is_true(#result.add_spans > 0)
-    end)
-
-    it('returns nil when del and add are identical', function()
-      local result = diff.compute_intra_hunks({
-        '-local x = 1',
-        '+local x = 1',
-      }, 'default')
-      assert.is_nil(result)
-    end)
-  end)
-
-  describe('has_vscode', function()
-    it('returns false in test environment', function()
-      assert.is_false(diff.has_vscode())
-    end)
-  end)
-end)

spec/fugitive_spec.lua

@@ -1,480 +0,0 @@
-require('spec.helpers')
-
-local fugitive = require('diffs.fugitive')
-
-describe('fugitive', function()
-  describe('get_section_at_line', function()
-    local function create_status_buffer(lines)
-      local buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
-      return buf
-    end
-
-    it('returns staged for lines in Staged section', function()
-      local buf = create_status_buffer({
-        'Head: main',
-        '',
-        'Staged (2)',
-        'M  file1.lua',
-        'A  file2.lua',
-        '',
-        'Unstaged (1)',
-        'M  file3.lua',
-      })
-      assert.equals('staged', fugitive.get_section_at_line(buf, 4))
-      assert.equals('staged', fugitive.get_section_at_line(buf, 5))
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns unstaged for lines in Unstaged section', function()
-      local buf = create_status_buffer({
-        'Head: main',
-        '',
-        'Staged (1)',
-        'M  file1.lua',
-        '',
-        'Unstaged (2)',
-        'M  file2.lua',
-        'M  file3.lua',
-      })
-      assert.equals('unstaged', fugitive.get_section_at_line(buf, 7))
-      assert.equals('unstaged', fugitive.get_section_at_line(buf, 8))
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns untracked for lines in Untracked section', function()
-      local buf = create_status_buffer({
-        'Head: main',
-        '',
-        'Untracked (2)',
-        '?  newfile.lua',
-        '?  another.lua',
-      })
-      assert.equals('untracked', fugitive.get_section_at_line(buf, 4))
-      assert.equals('untracked', fugitive.get_section_at_line(buf, 5))
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns nil for lines before any section', function()
-      local buf = create_status_buffer({
-        'Head: main',
-        'Push: origin/main',
-        '',
-        'Staged (1)',
-        'M  file1.lua',
-      })
-      assert.is_nil(fugitive.get_section_at_line(buf, 1))
-      assert.is_nil(fugitive.get_section_at_line(buf, 2))
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-  end)
-
-  describe('get_file_at_line', function()
-    local function create_status_buffer(lines)
-      local buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
-      return buf
-    end
-
-    it('parses simple modified file', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  src/foo.lua',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 2)
-      assert.equals('src/foo.lua', filename)
-      assert.equals('unstaged', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('parses added file', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'A  newfile.lua',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 2)
-      assert.equals('newfile.lua', filename)
-      assert.equals('staged', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('parses deleted file', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'D  oldfile.lua',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 2)
-      assert.equals('oldfile.lua', filename)
-      assert.equals('staged', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('parses renamed file and returns both names', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  oldname.lua -> newname.lua',
-      })
-      local filename, section, is_header, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('newname.lua', filename)
-      assert.equals('staged', section)
-      assert.is_false(is_header)
-      assert.equals('oldname.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('parses renamed file with similarity index', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R100  old.lua -> new.lua',
-      })
-      local filename, section, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('new.lua', filename)
-      assert.equals('staged', section)
-      assert.equals('old.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns nil old_filename for non-renames', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'M  modified.lua',
-      })
-      local filename, section, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('modified.lua', filename)
-      assert.equals('staged', section)
-      assert.is_nil(old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles renamed file with spaces in name', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  old file.lua -> new file.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('new file.lua', filename)
-      assert.equals('old file.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles renamed file in subdirectory', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  src/old.lua -> src/new.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('src/new.lua', filename)
-      assert.equals('src/old.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles renamed file moved to different directory', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  old/file.lua -> new/file.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('new/file.lua', filename)
-      assert.equals('old/file.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('KNOWN LIMITATION: filename containing arrow parsed incorrectly', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  a -> b.lua -> c.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('b.lua -> c.lua', filename)
-      assert.equals('a', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles double extensions', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'M  test.spec.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('test.spec.lua', filename)
-      assert.is_nil(old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles hyphenated filenames', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  my-component-test.lua',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 2)
-      assert.equals('my-component-test.lua', filename)
-      assert.equals('unstaged', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles underscores and numbers', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'A  test_file_123.lua',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('test_file_123.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles dotfiles', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  .gitignore',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('.gitignore', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles renamed with complex names', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'R  src/old-file.spec.lua -> src/new-file.spec.lua',
-      })
-      local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('src/new-file.spec.lua', filename)
-      assert.equals('src/old-file.spec.lua', old_filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles deeply nested paths', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  lua/diffs/ui/components/diff-view.lua',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('lua/diffs/ui/components/diff-view.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('parses untracked file', function()
-      local buf = create_status_buffer({
-        'Untracked (1)',
-        '?  untracked.lua',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 2)
-      assert.equals('untracked.lua', filename)
-      assert.equals('untracked', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns nil for section header', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-      })
-      local filename = fugitive.get_file_at_line(buf, 1)
-      assert.is_nil(filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('walks back from hunk line to find file', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-      local filename, section = fugitive.get_file_at_line(buf, 5)
-      assert.equals('file.lua', filename)
-      assert.equals('unstaged', section)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles file with both staged and unstaged indicator', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'M  both.lua',
-        '',
-        'Unstaged (1)',
-        'M  both.lua',
-      })
-      local filename1, section1 = fugitive.get_file_at_line(buf, 2)
-      assert.equals('both.lua', filename1)
-      assert.equals('staged', section1)
-
-      local filename2, section2 = fugitive.get_file_at_line(buf, 5)
-      assert.equals('both.lua', filename2)
-      assert.equals('unstaged', section2)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('detects section header for Staged', function()
-      local buf = create_status_buffer({
-        'Head: main',
-        '',
-        'Staged (2)',
-        'M  file1.lua',
-      })
-      local filename, section, is_header = fugitive.get_file_at_line(buf, 3)
-      assert.is_nil(filename)
-      assert.equals('staged', section)
-      assert.is_true(is_header)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('detects section header for Unstaged', function()
-      local buf = create_status_buffer({
-        'Unstaged (3)',
-        'M  file1.lua',
-      })
-      local filename, section, is_header = fugitive.get_file_at_line(buf, 1)
-      assert.is_nil(filename)
-      assert.equals('unstaged', section)
-      assert.is_true(is_header)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('detects section header for Untracked', function()
-      local buf = create_status_buffer({
-        'Untracked (1)',
-        '?  newfile.lua',
-      })
-      local filename, section, is_header = fugitive.get_file_at_line(buf, 1)
-      assert.is_nil(filename)
-      assert.equals('untracked', section)
-      assert.is_true(is_header)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns is_header=false for file lines', function()
-      local buf = create_status_buffer({
-        'Staged (1)',
-        'M  file.lua',
-      })
-      local filename, section, is_header = fugitive.get_file_at_line(buf, 2)
-      assert.equals('file.lua', filename)
-      assert.equals('staged', section)
-      assert.is_false(is_header)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-  end)
-
-  describe('get_hunk_position', function()
-    local function create_status_buffer(lines)
-      local buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
-      return buf
-    end
-
-    it('returns nil when on file header line', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-      })
-      local pos = fugitive.get_hunk_position(buf, 2)
-      assert.is_nil(pos)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns nil when on @@ header line', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-      })
-      local pos = fugitive.get_hunk_position(buf, 3)
-      assert.is_nil(pos)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns hunk header and offset for + line', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-      local pos = fugitive.get_hunk_position(buf, 5)
-      assert.is_not_nil(pos)
-      assert.equals('@@ -1,3 +1,4 @@', pos.hunk_header)
-      assert.equals(2, pos.offset)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns hunk header and offset for - line', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,3 @@',
-        ' local M = {}',
-        '-local old = false',
-        ' return M',
-      })
-      local pos = fugitive.get_hunk_position(buf, 5)
-      assert.is_not_nil(pos)
-      assert.equals('@@ -1,3 +1,3 @@', pos.hunk_header)
-      assert.equals(2, pos.offset)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns hunk header and offset for context line', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-      local pos = fugitive.get_hunk_position(buf, 6)
-      assert.is_not_nil(pos)
-      assert.equals('@@ -1,3 +1,4 @@', pos.hunk_header)
-      assert.equals(3, pos.offset)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns correct offset for first line after @@', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-      })
-      local pos = fugitive.get_hunk_position(buf, 4)
-      assert.is_not_nil(pos)
-      assert.equals(1, pos.offset)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('handles @@ header with context text', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        '@@ -10,3 +10,4 @@ function M.hello()',
-        '   print("hi")',
-        '+  print("world")',
-      })
-      local pos = fugitive.get_hunk_position(buf, 5)
-      assert.is_not_nil(pos)
-      assert.equals('@@ -10,3 +10,4 @@ function M.hello()', pos.hunk_header)
-      assert.equals(2, pos.offset)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('returns nil when section header interrupts search', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  file.lua',
-        ' some orphan line',
-      })
-      local pos = fugitive.get_hunk_position(buf, 3)
-      assert.is_nil(pos)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-  end)
-end)

spec/git_spec.lua

@@ -1,54 +0,0 @@
-require('spec.helpers')
-local git = require('diffs.git')
-
-describe('git', function()
-  describe('get_repo_root', function()
-    it('returns repo root for current repo', function()
-      local cwd = vim.fn.getcwd()
-      local root = git.get_repo_root(cwd .. '/lua/diffs/init.lua')
-      assert.is_not_nil(root)
-      assert.are.equal(cwd, root)
-    end)
-
-    it('returns nil for non-git directory', function()
-      local root = git.get_repo_root('/tmp')
-      assert.is_nil(root)
-    end)
-  end)
-
-  describe('get_file_content', function()
-    it('returns file content at HEAD', function()
-      local cwd = vim.fn.getcwd()
-      local content, err = git.get_file_content('HEAD', cwd .. '/lua/diffs/init.lua')
-      assert.is_nil(err)
-      assert.is_not_nil(content)
-      assert.is_true(#content > 0)
-    end)
-
-    it('returns error for non-existent file', function()
-      local cwd = vim.fn.getcwd()
-      local content, err = git.get_file_content('HEAD', cwd .. '/does_not_exist.lua')
-      assert.is_nil(content)
-      assert.is_not_nil(err)
-    end)
-
-    it('returns error for non-git directory', function()
-      local content, err = git.get_file_content('HEAD', '/tmp/some_file.txt')
-      assert.is_nil(content)
-      assert.is_not_nil(err)
-    end)
-  end)
-
-  describe('get_relative_path', function()
-    it('returns relative path within repo', function()
-      local cwd = vim.fn.getcwd()
-      local rel = git.get_relative_path(cwd .. '/lua/diffs/init.lua')
-      assert.are.equal('lua/diffs/init.lua', rel)
-    end)
-
-    it('returns nil for non-git directory', function()
-      local rel = git.get_relative_path('/tmp/some_file.txt')
-      assert.is_nil(rel)
-    end)
-  end)
-end)

spec/helpers.lua

@@ -2,8 +2,6 @@ local plugin_dir = vim.fn.getcwd()
 vim.opt.runtimepath:prepend(plugin_dir)
 vim.opt.packpath = {}
 
-vim.cmd('filetype on')
-
 local function ensure_parser(lang)
   local ok = pcall(vim.treesitter.language.inspect, lang)
   if not ok then
@@ -12,7 +10,6 @@ local function ensure_parser(lang)
 end
 
 ensure_parser('lua')
-ensure_parser('vim')
 
 local M = {}
 

spec/init_spec.lua

@@ -2,33 +2,26 @@ require('spec.helpers')
 local diffs = require('diffs')
 
 describe('diffs', function()
-  describe('vim.g.diffs config', function()
-    after_each(function()
-      vim.g.diffs = nil
-    end)
-
-    it('accepts nil config', function()
-      vim.g.diffs = nil
+  describe('setup', function()
+    it('accepts empty config', function()
       assert.has_no.errors(function()
-        diffs.attach()
+        diffs.setup({})
       end)
     end)
 
-    it('accepts empty config', function()
-      vim.g.diffs = {}
+    it('accepts nil config', function()
       assert.has_no.errors(function()
-        diffs.attach()
+        diffs.setup()
       end)
     end)
 
     it('accepts full config', function()
-      vim.g.diffs = {
-        debug = true,
-        debounce_ms = 100,
-        hide_prefix = false,
-        highlights = {
-          background = true,
-          gutter = true,
+      assert.has_no.errors(function()
+        diffs.setup({
+          enabled = false,
+          debug = true,
+          debounce_ms = 100,
+          hide_prefix = false,
           treesitter = {
             enabled = true,
             max_lines = 1000,
@@ -37,19 +30,19 @@ describe('diffs', function()
             enabled = false,
             max_lines = 200,
           },
-        },
-      }
-      assert.has_no.errors(function()
-        diffs.attach()
+          highlights = {
+            background = true,
+            gutter = true,
+          },
+        })
       end)
     end)
 
     it('accepts partial config', function()
-      vim.g.diffs = {
-        debounce_ms = 25,
-      }
       assert.has_no.errors(function()
-        diffs.attach()
+        diffs.setup({
+          debounce_ms = 25,
+        })
       end)
     end)
   end)
@@ -67,6 +60,10 @@ describe('diffs', function()
       end
     end
 
+    before_each(function()
+      diffs.setup({ enabled = true })
+    end)
+
     it('does not error on empty buffer', function()
       local bufnr = create_buffer({})
       assert.has_no.errors(function()
@@ -112,6 +109,10 @@ describe('diffs', function()
       end
     end
 
+    before_each(function()
+      diffs.setup({ enabled = true })
+    end)
+
     it('does not error on unattached buffer', function()
       local bufnr = create_buffer({})
       assert.has_no.errors(function()
@@ -130,6 +131,26 @@ describe('diffs', function()
     end)
   end)
 
+  describe('config options', function()
+    it('enabled=false prevents highlighting', function()
+      diffs.setup({ enabled = false })
+      local bufnr = vim.api.nvim_create_buf(false, true)
+      vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, {
+        'M test.lua',
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+      diffs.attach(bufnr)
+
+      local ns = vim.api.nvim_create_namespace('diffs')
+      local extmarks = vim.api.nvim_buf_get_extmarks(bufnr, ns, 0, -1, {})
+      assert.are.equal(0, #extmarks)
+
+      vim.api.nvim_buf_delete(bufnr, { force = true })
+    end)
+  end)
+
   describe('is_fugitive_buffer', function()
     it('returns true for fugitive:// URLs', function()
       local bufnr = vim.api.nvim_create_buf(false, true)
@@ -167,6 +188,10 @@ describe('diffs', function()
       end
     end
 
+    before_each(function()
+      diffs.setup({ enabled = true })
+    end)
+
     describe('attach_diff', function()
       it('applies winhighlight to diff windows', function()
         local win, _ = create_diff_window()
@@ -179,6 +204,17 @@ describe('diffs', function()
         close_window(win)
       end)
 
+      it('does nothing when enabled=false', function()
+        diffs.setup({ enabled = false })
+        local win, _ = create_diff_window()
+        diffs.attach_diff()
+
+        local whl = vim.api.nvim_get_option_value('winhighlight', { win = win })
+        assert.are.equal('', whl)
+
+        close_window(win)
+      end)
+
       it('is idempotent', function()
         local win, _ = create_diff_window()
         assert.has_no.errors(function()

spec/parser_spec.lua

@@ -215,290 +215,5 @@ describe('parser', function()
       assert.are.equal(1, #hunks[2].lines)
       delete_buffer(bufnr)
     end)
-
-    it('attaches header_lines to first hunk only', function()
-      local bufnr = create_buffer({
-        'diff --git a/parser.lua b/parser.lua',
-        'index 3e8afa0..018159c 100644',
-        '--- a/parser.lua',
-        '+++ b/parser.lua',
-        '@@ -1,2 +1,3 @@',
-        ' local M = {}',
-        '+local x = 1',
-        '@@ -10,2 +11,3 @@',
-        ' function M.foo()',
-        '+  return true',
-        ' end',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(2, #hunks)
-      assert.is_not_nil(hunks[1].header_start_line)
-      assert.is_not_nil(hunks[1].header_lines)
-      assert.are.equal(1, hunks[1].header_start_line)
-      assert.is_nil(hunks[2].header_start_line)
-      assert.is_nil(hunks[2].header_lines)
-      delete_buffer(bufnr)
-    end)
-
-    it('header_lines contains only diff metadata, not hunk content', function()
-      local bufnr = create_buffer({
-        'diff --git a/parser.lua b/parser.lua',
-        'index 3e8afa0..018159c 100644',
-        '--- a/parser.lua',
-        '+++ b/parser.lua',
-        '@@ -1,2 +1,3 @@',
-        ' local M = {}',
-        '+local x = 1',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(4, #hunks[1].header_lines)
-      assert.are.equal('diff --git a/parser.lua b/parser.lua', hunks[1].header_lines[1])
-      assert.are.equal('index 3e8afa0..018159c 100644', hunks[1].header_lines[2])
-      assert.are.equal('--- a/parser.lua', hunks[1].header_lines[3])
-      assert.are.equal('+++ b/parser.lua', hunks[1].header_lines[4])
-      delete_buffer(bufnr)
-    end)
-
-    it('handles fugitive status format with diff headers', function()
-      local bufnr = create_buffer({
-        'Head: main',
-        'Push: origin/main',
-        '',
-        'Unstaged (1)',
-        'M parser.lua',
-        'diff --git a/parser.lua b/parser.lua',
-        'index 3e8afa0..018159c 100644',
-        '--- a/parser.lua',
-        '+++ b/parser.lua',
-        '@@ -1,2 +1,3 @@',
-        ' local M = {}',
-        '+local x = 1',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(6, hunks[1].header_start_line)
-      assert.are.equal(4, #hunks[1].header_lines)
-      assert.are.equal('diff --git a/parser.lua b/parser.lua', hunks[1].header_lines[1])
-      delete_buffer(bufnr)
-    end)
-
-    it('emits hunk for files with unknown filetype', function()
-      local bufnr = create_buffer({
-        'M config.obscuretype',
-        '@@ -1,2 +1,3 @@',
-        ' setting1 = value1',
-        '-setting2 = value2',
-        '+setting2 = MODIFIED',
-        '+setting4 = newvalue',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('config.obscuretype', hunks[1].filename)
-      assert.is_nil(hunks[1].ft)
-      assert.is_nil(hunks[1].lang)
-      assert.are.equal(4, #hunks[1].lines)
-      delete_buffer(bufnr)
-    end)
-
-    it('uses filetype from existing buffer when available', function()
-      local repo_root = '/tmp/test-repo'
-      local file_path = repo_root .. '/build'
-
-      local file_buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_name(file_buf, file_path)
-      vim.api.nvim_set_option_value('filetype', 'bash', { buf = file_buf })
-
-      local diff_buf = create_buffer({
-        'M build',
-        '@@ -1,2 +1,3 @@',
-        ' echo "hello"',
-        '+set -e',
-        ' echo "done"',
-      })
-      vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-
-      local hunks = parser.parse_buffer(diff_buf)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('build', hunks[1].filename)
-      assert.are.equal('bash', hunks[1].ft)
-
-      delete_buffer(file_buf)
-      delete_buffer(diff_buf)
-    end)
-
-    it('uses filetype from existing buffer via git_dir', function()
-      local git_dir = '/tmp/test-repo/.git'
-      local repo_root = '/tmp/test-repo'
-      local file_path = repo_root .. '/script'
-
-      local file_buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_name(file_buf, file_path)
-      vim.api.nvim_set_option_value('filetype', 'python', { buf = file_buf })
-
-      local diff_buf = create_buffer({
-        'M script',
-        '@@ -1,2 +1,3 @@',
-        ' def main():',
-        '+    print("hi")',
-        '     pass',
-      })
-      vim.api.nvim_buf_set_var(diff_buf, 'git_dir', git_dir)
-
-      local hunks = parser.parse_buffer(diff_buf)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('script', hunks[1].filename)
-      assert.are.equal('python', hunks[1].ft)
-
-      delete_buffer(file_buf)
-      delete_buffer(diff_buf)
-    end)
-
-    it('detects filetype from file content shebang without open buffer', function()
-      local repo_root = '/tmp/diffs-test-shebang'
-      vim.fn.mkdir(repo_root, 'p')
-
-      local file_path = repo_root .. '/build'
-      local f = io.open(file_path, 'w')
-      f:write('#!/bin/bash\n')
-      f:write('set -e\n')
-      f:write('echo "hello"\n')
-      f:close()
-
-      local diff_buf = create_buffer({
-        'M build',
-        '@@ -1,2 +1,3 @@',
-        ' #!/bin/bash',
-        '+set -e',
-        ' echo "hello"',
-      })
-      vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-
-      local hunks = parser.parse_buffer(diff_buf)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('build', hunks[1].filename)
-      assert.are.equal('sh', hunks[1].ft)
-
-      delete_buffer(diff_buf)
-      os.remove(file_path)
-      vim.fn.delete(repo_root, 'rf')
-    end)
-
-    it('detects python from shebang without open buffer', function()
-      local repo_root = '/tmp/diffs-test-shebang-py'
-      vim.fn.mkdir(repo_root, 'p')
-
-      local file_path = repo_root .. '/deploy'
-      local f = io.open(file_path, 'w')
-      f:write('#!/usr/bin/env python3\n')
-      f:write('import sys\n')
-      f:write('print("hi")\n')
-      f:close()
-
-      local diff_buf = create_buffer({
-        'M deploy',
-        '@@ -1,2 +1,3 @@',
-        ' #!/usr/bin/env python3',
-        '+import sys',
-        ' print("hi")',
-      })
-      vim.api.nvim_buf_set_var(diff_buf, 'diffs_repo_root', repo_root)
-
-      local hunks = parser.parse_buffer(diff_buf)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('deploy', hunks[1].filename)
-      assert.are.equal('python', hunks[1].ft)
-
-      delete_buffer(diff_buf)
-      os.remove(file_path)
-      vim.fn.delete(repo_root, 'rf')
-    end)
-
-    it('extracts file line numbers from @@ header', function()
-      local bufnr = create_buffer({
-        'M lua/test.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(1, hunks[1].file_old_start)
-      assert.are.equal(3, hunks[1].file_old_count)
-      assert.are.equal(1, hunks[1].file_new_start)
-      assert.are.equal(4, hunks[1].file_new_count)
-      delete_buffer(bufnr)
-    end)
-
-    it('extracts large line numbers from @@ header', function()
-      local bufnr = create_buffer({
-        'M lua/test.lua',
-        '@@ -100,20 +200,30 @@',
-        ' local M = {}',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(100, hunks[1].file_old_start)
-      assert.are.equal(20, hunks[1].file_old_count)
-      assert.are.equal(200, hunks[1].file_new_start)
-      assert.are.equal(30, hunks[1].file_new_count)
-      delete_buffer(bufnr)
-    end)
-
-    it('defaults count to 1 when omitted in @@ header', function()
-      local bufnr = create_buffer({
-        'M lua/test.lua',
-        '@@ -1 +1 @@',
-        ' local M = {}',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(1, hunks[1].file_old_start)
-      assert.are.equal(1, hunks[1].file_old_count)
-      assert.are.equal(1, hunks[1].file_new_start)
-      assert.are.equal(1, hunks[1].file_new_count)
-      delete_buffer(bufnr)
-    end)
-
-    it('stores repo_root on hunk when available', function()
-      local bufnr = create_buffer({
-        'M lua/test.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-      vim.api.nvim_buf_set_var(bufnr, 'diffs_repo_root', '/tmp/test-repo')
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('/tmp/test-repo', hunks[1].repo_root)
-      delete_buffer(bufnr)
-    end)
-
-    it('repo_root is nil when not available', function()
-      local bufnr = create_buffer({
-        'M lua/test.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.is_nil(hunks[1].repo_root)
-      delete_buffer(bufnr)
-    end)
   end)
 end)

spec/read_buffer_spec.lua

@@ -1,400 +0,0 @@
-require('spec.helpers')
-
-local commands = require('diffs.commands')
-local diffs = require('diffs')
-local git = require('diffs.git')
-
-local saved_git = {}
-local saved_systemlist
-local test_buffers = {}
-
-local function mock_git(overrides)
-  overrides = overrides or {}
-  saved_git.get_file_content = git.get_file_content
-  saved_git.get_index_content = git.get_index_content
-  saved_git.get_working_content = git.get_working_content
-
-  git.get_file_content = overrides.get_file_content
-    or function()
-      return { 'local M = {}', 'return M' }
-    end
-  git.get_index_content = overrides.get_index_content
-    or function()
-      return { 'local M = {}', 'return M' }
-    end
-  git.get_working_content = overrides.get_working_content
-    or function()
-      return { 'local M = {}', 'local x = 1', 'return M' }
-    end
-end
-
-local function mock_systemlist(fn)
-  saved_systemlist = vim.fn.systemlist
-  vim.fn.systemlist = function(cmd)
-    local result = fn(cmd)
-    saved_systemlist({ 'true' })
-    return result
-  end
-end
-
-local function restore_mocks()
-  for k, v in pairs(saved_git) do
-    git[k] = v
-  end
-  saved_git = {}
-  if saved_systemlist then
-    vim.fn.systemlist = saved_systemlist
-    saved_systemlist = nil
-  end
-end
-
----@param name string
----@param vars? table<string, any>
----@return integer
-local function create_diffs_buffer(name, vars)
-  local existing = vim.fn.bufnr(name)
-  if existing ~= -1 then
-    vim.api.nvim_buf_delete(existing, { force = true })
-  end
-  local bufnr = vim.api.nvim_create_buf(false, true)
-  vim.api.nvim_buf_set_name(bufnr, name)
-  vars = vars or {}
-  for k, v in pairs(vars) do
-    vim.api.nvim_buf_set_var(bufnr, k, v)
-  end
-  table.insert(test_buffers, bufnr)
-  return bufnr
-end
-
-local function cleanup_buffers()
-  for _, bufnr in ipairs(test_buffers) do
-    if vim.api.nvim_buf_is_valid(bufnr) then
-      vim.api.nvim_buf_delete(bufnr, { force = true })
-    end
-  end
-  test_buffers = {}
-end
-
-describe('read_buffer', function()
-  after_each(function()
-    restore_mocks()
-    cleanup_buffers()
-  end)
-
-  describe('early returns', function()
-    it('does nothing on non-diffs:// buffer', function()
-      local bufnr = vim.api.nvim_create_buf(false, true)
-      table.insert(test_buffers, bufnr)
-      assert.has_no.errors(function()
-        commands.read_buffer(bufnr)
-      end)
-      assert.are.same({ '' }, vim.api.nvim_buf_get_lines(bufnr, 0, -1, false))
-    end)
-
-    it('does nothing on malformed url without colon separator', function()
-      local bufnr = create_diffs_buffer('diffs://nocolonseparator')
-      vim.api.nvim_buf_set_var(bufnr, 'diffs_repo_root', '/tmp')
-      local lines_before = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.has_no.errors(function()
-        commands.read_buffer(bufnr)
-      end)
-      assert.are.same(lines_before, vim.api.nvim_buf_get_lines(bufnr, 0, -1, false))
-    end)
-
-    it('does nothing when diffs_repo_root is missing', function()
-      local bufnr = create_diffs_buffer('diffs://staged:missing_root.lua')
-      assert.has_no.errors(function()
-        commands.read_buffer(bufnr)
-      end)
-      assert.are.same({ '' }, vim.api.nvim_buf_get_lines(bufnr, 0, -1, false))
-    end)
-  end)
-
-  describe('buffer options', function()
-    it('sets buftype, bufhidden, swapfile, modifiable, filetype', function()
-      mock_git()
-      local bufnr = create_diffs_buffer('diffs://staged:options_test.lua', {
-        diffs_repo_root = '/tmp',
-      })
-
-      commands.read_buffer(bufnr)
-
-      assert.are.equal('nowrite', vim.api.nvim_get_option_value('buftype', { buf = bufnr }))
-      assert.are.equal('delete', vim.api.nvim_get_option_value('bufhidden', { buf = bufnr }))
-      assert.is_false(vim.api.nvim_get_option_value('swapfile', { buf = bufnr }))
-      assert.is_false(vim.api.nvim_get_option_value('modifiable', { buf = bufnr }))
-      assert.are.equal('diff', vim.api.nvim_get_option_value('filetype', { buf = bufnr }))
-    end)
-  end)
-
-  describe('dispatch', function()
-    it('calls get_file_content + get_index_content for staged label', function()
-      local called_get_file = false
-      local called_get_index = false
-      mock_git({
-        get_file_content = function()
-          called_get_file = true
-          return { 'old' }
-        end,
-        get_index_content = function()
-          called_get_index = true
-          return { 'new' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://staged:dispatch_staged.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.is_true(called_get_file)
-      assert.is_true(called_get_index)
-    end)
-
-    it('calls get_index_content + get_working_content for unstaged label', function()
-      local called_get_index = false
-      local called_get_working = false
-      mock_git({
-        get_index_content = function()
-          called_get_index = true
-          return { 'index' }
-        end,
-        get_working_content = function()
-          called_get_working = true
-          return { 'working' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://unstaged:dispatch_unstaged.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.is_true(called_get_index)
-      assert.is_true(called_get_working)
-    end)
-
-    it('calls only get_working_content for untracked label', function()
-      local called_get_file = false
-      local called_get_working = false
-      mock_git({
-        get_file_content = function()
-          called_get_file = true
-          return {}
-        end,
-        get_working_content = function()
-          called_get_working = true
-          return { 'new file' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://untracked:dispatch_untracked.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.is_false(called_get_file)
-      assert.is_true(called_get_working)
-    end)
-
-    it('calls get_file_content + get_working_content for revision label', function()
-      local captured_rev
-      local called_get_working = false
-      mock_git({
-        get_file_content = function(rev)
-          captured_rev = rev
-          return { 'old' }
-        end,
-        get_working_content = function()
-          called_get_working = true
-          return { 'new' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://HEAD~3:dispatch_rev.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.are.equal('HEAD~3', captured_rev)
-      assert.is_true(called_get_working)
-    end)
-
-    it('falls back from index to HEAD for unstaged when index returns nil', function()
-      local call_order = {}
-      mock_git({
-        get_index_content = function()
-          table.insert(call_order, 'index')
-          return nil
-        end,
-        get_file_content = function()
-          table.insert(call_order, 'head')
-          return { 'head content' }
-        end,
-        get_working_content = function()
-          return { 'working content' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://unstaged:dispatch_fallback.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.are.same({ 'index', 'head' }, call_order)
-    end)
-
-    it('runs git diff for section diffs with path=all', function()
-      local captured_cmd
-      mock_systemlist(function(cmd)
-        captured_cmd = cmd
-        return {
-          'diff --git a/file.lua b/file.lua',
-          '--- a/file.lua',
-          '+++ b/file.lua',
-          '@@ -1 +1 @@',
-          '-old',
-          '+new',
-        }
-      end)
-
-      local bufnr = create_diffs_buffer('diffs://unstaged:all', {
-        diffs_repo_root = '/home/test/repo',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.is_not_nil(captured_cmd)
-      assert.are.equal('git', captured_cmd[1])
-      assert.are.equal('/home/test/repo', captured_cmd[3])
-      assert.are.equal('diff', captured_cmd[4])
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal('diff --git a/file.lua b/file.lua', lines[1])
-    end)
-
-    it('passes --cached for staged section diffs', function()
-      local captured_cmd
-      mock_systemlist(function(cmd)
-        captured_cmd = cmd
-        return { 'diff --git a/f.lua b/f.lua', '@@ -1 +1 @@', '-a', '+b' }
-      end)
-
-      local bufnr = create_diffs_buffer('diffs://staged:all', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.is_truthy(vim.tbl_contains(captured_cmd, '--cached'))
-    end)
-  end)
-
-  describe('content', function()
-    it('generates valid unified diff header with correct paths', function()
-      mock_git({
-        get_file_content = function()
-          return { 'old' }
-        end,
-        get_working_content = function()
-          return { 'new' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://HEAD:lua/diffs/init.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal('diff --git a/lua/diffs/init.lua b/lua/diffs/init.lua', lines[1])
-      assert.are.equal('--- a/lua/diffs/init.lua', lines[2])
-      assert.are.equal('+++ b/lua/diffs/init.lua', lines[3])
-    end)
-
-    it('uses old_filepath for diff header in renames', function()
-      mock_git({
-        get_file_content = function(_, path)
-          assert.are.equal('/tmp/old_name.lua', path)
-          return { 'old content' }
-        end,
-        get_index_content = function()
-          return { 'new content' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://staged:new_name.lua', {
-        diffs_repo_root = '/tmp',
-        diffs_old_filepath = 'old_name.lua',
-      })
-      commands.read_buffer(bufnr)
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal('diff --git a/old_name.lua b/new_name.lua', lines[1])
-      assert.are.equal('--- a/old_name.lua', lines[2])
-      assert.are.equal('+++ b/new_name.lua', lines[3])
-    end)
-
-    it('produces empty buffer when old and new are identical', function()
-      mock_git({
-        get_file_content = function()
-          return { 'identical' }
-        end,
-        get_working_content = function()
-          return { 'identical' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://HEAD:nodiff.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.same({ '' }, lines)
-    end)
-
-    it('replaces existing buffer content on reload', function()
-      mock_git({
-        get_file_content = function()
-          return { 'old' }
-        end,
-        get_working_content = function()
-          return { 'new' }
-        end,
-      })
-
-      local bufnr = create_diffs_buffer('diffs://HEAD:replace_test.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, { 'stale', 'content', 'from', 'before' })
-
-      commands.read_buffer(bufnr)
-
-      local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-      assert.are.equal('diff --git a/replace_test.lua b/replace_test.lua', lines[1])
-      for _, line in ipairs(lines) do
-        assert.is_not_equal('stale', line)
-      end
-    end)
-  end)
-
-  describe('attach integration', function()
-    it('calls attach on the buffer', function()
-      mock_git()
-
-      local attach_called_with
-      local original_attach = diffs.attach
-      diffs.attach = function(bufnr)
-        attach_called_with = bufnr
-      end
-
-      local bufnr = create_diffs_buffer('diffs://staged:attach_test.lua', {
-        diffs_repo_root = '/tmp',
-      })
-      commands.read_buffer(bufnr)
-
-      assert.are.equal(bufnr, attach_called_with)
-
-      diffs.attach = original_attach
-    end)
-  end)
-end)

spec/ux_spec.lua

@@ -1,135 +0,0 @@
-local commands = require('diffs.commands')
-local helpers = require('spec.helpers')
-
-local counter = 0
-
-local function create_diffs_buffer(name)
-  counter = counter + 1
-  local bufnr = vim.api.nvim_create_buf(false, true)
-  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, {
-    'diff --git a/file.lua b/file.lua',
-    '--- a/file.lua',
-    '+++ b/file.lua',
-    '@@ -1,1 +1,2 @@',
-    ' local x = 1',
-    '+local y = 2',
-  })
-  vim.api.nvim_set_option_value('buftype', 'nowrite', { buf = bufnr })
-  vim.api.nvim_set_option_value('bufhidden', 'wipe', { buf = bufnr })
-  vim.api.nvim_set_option_value('swapfile', false, { buf = bufnr })
-  vim.api.nvim_set_option_value('modifiable', false, { buf = bufnr })
-  vim.api.nvim_set_option_value('filetype', 'diff', { buf = bufnr })
-  vim.api.nvim_buf_set_name(bufnr, name or ('diffs://unstaged:file_' .. counter .. '.lua'))
-  return bufnr
-end
-
-describe('ux', function()
-  describe('diagnostics', function()
-    it('disables diagnostics on diff buffers', function()
-      local bufnr = create_diffs_buffer()
-      commands.setup_diff_buf(bufnr)
-
-      assert.is_false(vim.diagnostic.is_enabled({ bufnr = bufnr }))
-      vim.api.nvim_buf_delete(bufnr, { force = true })
-    end)
-
-    it('does not affect other buffers', function()
-      local diff_buf = create_diffs_buffer()
-      local normal_buf = helpers.create_buffer({ 'hello' })
-
-      commands.setup_diff_buf(diff_buf)
-
-      assert.is_true(vim.diagnostic.is_enabled({ bufnr = normal_buf }))
-      vim.api.nvim_buf_delete(diff_buf, { force = true })
-      helpers.delete_buffer(normal_buf)
-    end)
-  end)
-
-  describe('q keymap', function()
-    it('sets q keymap on diff buffer', function()
-      local bufnr = create_diffs_buffer()
-      commands.setup_diff_buf(bufnr)
-
-      local keymaps = vim.api.nvim_buf_get_keymap(bufnr, 'n')
-      local has_q = false
-      for _, km in ipairs(keymaps) do
-        if km.lhs == 'q' then
-          has_q = true
-          break
-        end
-      end
-      assert.is_true(has_q)
-      vim.api.nvim_buf_delete(bufnr, { force = true })
-    end)
-
-    it('q closes the window', function()
-      local bufnr = create_diffs_buffer()
-      commands.setup_diff_buf(bufnr)
-
-      vim.cmd('split')
-      local win = vim.api.nvim_get_current_win()
-      vim.api.nvim_win_set_buf(win, bufnr)
-
-      local win_count_before = #vim.api.nvim_tabpage_list_wins(0)
-
-      vim.api.nvim_buf_call(bufnr, function()
-        vim.cmd('normal q')
-      end)
-
-      local win_count_after = #vim.api.nvim_tabpage_list_wins(0)
-      assert.equals(win_count_before - 1, win_count_after)
-    end)
-  end)
-
-  describe('window reuse', function()
-    it('returns nil when no diffs window exists', function()
-      local win = commands.find_diffs_window()
-      assert.is_nil(win)
-    end)
-
-    it('finds existing diffs:// window', function()
-      local bufnr = create_diffs_buffer()
-      vim.cmd('split')
-      local expected_win = vim.api.nvim_get_current_win()
-      vim.api.nvim_win_set_buf(expected_win, bufnr)
-
-      local found = commands.find_diffs_window()
-      assert.equals(expected_win, found)
-
-      vim.api.nvim_win_close(expected_win, true)
-    end)
-
-    it('ignores non-diffs buffers', function()
-      local normal_buf = helpers.create_buffer({ 'hello' })
-      vim.cmd('split')
-      local win = vim.api.nvim_get_current_win()
-      vim.api.nvim_win_set_buf(win, normal_buf)
-
-      local found = commands.find_diffs_window()
-      assert.is_nil(found)
-
-      vim.api.nvim_win_close(win, true)
-      helpers.delete_buffer(normal_buf)
-    end)
-
-    it('returns first diffs window when multiple exist', function()
-      local buf1 = create_diffs_buffer()
-      local buf2 = create_diffs_buffer()
-
-      vim.cmd('split')
-      local win1 = vim.api.nvim_get_current_win()
-      vim.api.nvim_win_set_buf(win1, buf1)
-
-      vim.cmd('split')
-      local win2 = vim.api.nvim_get_current_win()
-      vim.api.nvim_win_set_buf(win2, buf2)
-
-      local found = commands.find_diffs_window()
-      assert.is_not_nil(found)
-      assert.is_true(found == win1 or found == win2)
-
-      vim.api.nvim_win_close(win1, true)
-      vim.api.nvim_win_close(win2, true)
-    end)
-  end)
-end)