doc: add plug mappings for merge conflict resolution

README.md

@@ -5,18 +5,22 @@
 Enhance `vim-fugitive` and Neovim's built-in diff mode with language-aware
 syntax highlighting.
 
-![diffs.nvim preview](https://github.com/user-attachments/assets/56dbe55e-7789-407f-9bcf-c5f1ab9d4767)
+![diffs.nvim preview](https://github.com/user-attachments/assets/d3d64c96-b824-4fcb-af7f-4aef3f7f498a)
 
 ## Features
 
-- Treesitter syntax highlighting in fugitive diffs and commit views
+- Treesitter syntax highlighting in `:Git` diffs and commit views
-- Character-level intra-line diff highlighting (with optional
+- Diff header highlighting (`diff --git`, `index`, `---`, `+++`)
-  [vscode-diff](https://github.com/esmuellert/codediff.nvim) FFI backend for
+- `:Gdiffsplit` / `:Gvdiffsplit` syntax through diff backgrounds
-  word-level accuracy)
+- `:Gdiff` unified diff against any git revision with syntax highlighting
-- `:Gdiff` unified diff against any revision
+- Fugitive status buffer keymaps (`du`/`dU`) for unified diffs
-- Background-only diff colors for `&diff` buffers
+- Background-only diff colors for any `&diff` buffer (`:diffthis`, `vimdiff`)
-- Inline merge conflict detection, highlighting, and resolution
+- Vim syntax fallback for languages without a treesitter parser
-- Vim syntax fallback, configurable blend/debounce/priorities
+- 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
 
 ## Requirements
 
@@ -40,9 +44,10 @@ luarocks install diffs.nvim
 ## Known Limitations
 
 - **Incomplete syntax context**: Treesitter parses each diff hunk in isolation.
-  Context lines within the hunk (` ` prefix) provide syntactic context for the
+  To improve accuracy, `diffs.nvim` reads lines from disk before and after each
-  parser. In rare cases, hunks that start or end mid-expression may produce
+  hunk for parsing context (`highlights.context`, enabled by default with 25
-  imperfect highlights due to treesitter error recovery.
+  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
@@ -65,9 +70,7 @@ luarocks install diffs.nvim
 # Acknowledgements
 
 - [`vim-fugitive`](https://github.com/tpope/vim-fugitive)
-- [@esmuellert](https://github.com/esmuellert) /
+- [`codediff.nvim`](https://github.com/esmuellert/codediff.nvim)
-  [`codediff.nvim`](https://github.com/esmuellert/codediff.nvim) - vscode-diff
-  algorithm FFI backend for word-level intra-line accuracy
 - [`diffview.nvim`](https://github.com/sindrets/diffview.nvim)
 - [`difftastic`](https://github.com/Wilfred/difftastic)
 - [`mini.diff`](https://github.com/echasnovski/mini.diff)

doc/diffs.nvim.txt

@@ -75,12 +75,6 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
           algorithm = 'default',
           max_lines = 500,
         },
-        priorities = {
-          clear = 198,
-          syntax = 199,
-          line_bg = 200,
-          char_bg = 201,
-        },
         overrides = {},
       },
       fugitive = {
@@ -91,7 +85,6 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
         enabled = true,
         disable_diagnostics = true,
         show_virtual_text = true,
-        show_actions = false,
         keymaps = {
           ours = 'doo',
           theirs = 'dot',
@@ -167,10 +160,6 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
                              Character-level (intra-line) diff highlighting.
                              See |diffs.IntraConfig| for fields.
 
-        {priorities}         (table, default: see below)
-                             Extmark priority values.
-                             See |diffs.PrioritiesConfig| for fields.
-
         {overrides}          (table, default: {})
                              Map of highlight group names to highlight
                              definitions (see |nvim_set_hl()|). Applied
@@ -192,28 +181,6 @@ Configuration is done via `vim.g.diffs`. Set this before the plugin loads:
                              direction. Lines are read with early exit —
                              cost scales with this value, not file size.
 
-                                                   *diffs.PrioritiesConfig*
-    Priorities config fields: ~
-        {clear}              (integer, default: 198)
-                             Priority for `DiffsClear` extmarks that reset
-                             underlying diff foreground colors. Must be
-                             below {syntax}.
-
-        {syntax}             (integer, default: 199)
-                             Priority for treesitter and vim syntax extmarks.
-                             Must be below {line_bg} so that colorscheme
-                             backgrounds on syntax groups do not obscure
-                             line-level diff backgrounds.
-
-        {line_bg}            (integer, default: 200)
-                             Priority for `DiffsAdd`/`DiffsDelete` line
-                             background extmarks. Must be below {char_bg}.
-
-        {char_bg}            (integer, default: 201)
-                             Priority for `DiffsAddText`/`DiffsDeleteText`
-                             character-level background extmarks. Highest
-                             priority so changed characters stand out.
-
                                                     *diffs.TreesitterConfig*
     Treesitter config fields: ~
         {enabled}            (boolean, default: true)
@@ -348,32 +315,6 @@ Example configuration: >lua
     vim.keymap.set('n', '[x', '<Plug>(diffs-conflict-prev)')
 <
 
-                                                 *<Plug>(diffs-merge-ours)*
-<Plug>(diffs-merge-ours)
-                        Accept ours in a merge diff view. Resolves the
-                        conflict in the working file with ours content.
-
-                                               *<Plug>(diffs-merge-theirs)*
-<Plug>(diffs-merge-theirs)
-                        Accept theirs in a merge diff view.
-
-                                                 *<Plug>(diffs-merge-both)*
-<Plug>(diffs-merge-both)
-                        Accept both (ours then theirs) in a merge diff view.
-
-                                                 *<Plug>(diffs-merge-none)*
-<Plug>(diffs-merge-none)
-                        Reject both in a merge diff view.
-
-                                                 *<Plug>(diffs-merge-next)*
-<Plug>(diffs-merge-next)
-                        Jump to next unresolved conflict hunk in merge diff.
-
-                                                 *<Plug>(diffs-merge-prev)*
-<Plug>(diffs-merge-prev)
-                        Jump to previous unresolved conflict hunk in merge
-                        diff.
-
 Diff buffer mappings: ~
                                                               *diffs-q*
     q               Close the diff window. Available in all `diffs://`
@@ -404,7 +345,6 @@ Behavior by file status: ~
     A           Staged      (empty)         index           file as all-added
     D           Staged      HEAD            (empty)         file as all-removed
     R           Staged      HEAD:oldname    index:newname   content diff
-    U           Unstaged    :2: (ours)      :3: (theirs)    merge diff
     ?           Untracked   (empty)         working tree    file as all-added
 
 On section headers, the keymap runs `git diff` (or `git diff --cached` for
@@ -449,8 +389,6 @@ Configuration: ~
         enabled = true,
         disable_diagnostics = true,
         show_virtual_text = true,
-        show_actions = false,
-        priority = 200,
         keymaps = {
           ours = 'doo',
           theirs = 'dot',
@@ -477,37 +415,9 @@ Configuration: ~
                              diagnostics alone.
 
         {show_virtual_text}  (boolean, default: true)
-                             Show `(current)` and `(incoming)` labels at
+                             Show virtual text labels (" current" and
-                             the end of `<<<<<<<` and `>>>>>>>` marker
+                             " incoming") at the end of `<<<<<<<` and
-                             lines. Also controls hunk hints in merge
+                             `>>>>>>>` marker lines.
-                             diff views.
-
-        {format_virtual_text} (function|nil, default: nil)
-                             Custom formatter for virtual text labels.
-                             Receives `(side, keymap)` where `side` is
-                             `"ours"` or `"theirs"` and `keymap` is the
-                             configured keymap string or `false`. Return
-                             a string (label text without parens) or
-                             `nil` to hide the label. Example: >lua
-                                 format_virtual_text = function(side, keymap)
-                                   if keymap then
-                                     return side .. ' [' .. keymap .. ']'
-                                   end
-                                   return side
-                                 end
-<
-
-        {show_actions}       (boolean, default: false)
-                             Show a codelens-style action line above each
-                             `<<<<<<<` marker listing available resolution
-                             keymaps. Renders as virtual lines using the
-                             `DiffsConflictActions` highlight group.
-                             Only keymaps that are not `false` appear.
-
-        {priority}           (integer, default: 200)
-                             Extmark priority for conflict region
-                             backgrounds and markers. Adjust if other
-                             plugins use the same priority range.
 
         {keymaps}            (table, default: see above)
                              Buffer-local keymaps for conflict resolution
@@ -548,31 +458,6 @@ User events: ~
                                 })
 <
 
-==============================================================================
-MERGE DIFF RESOLUTION                                       *diffs-merge*
-
-When pressing `du`/`dU` on an unmerged (`U`) file in the fugitive status
-buffer, diffs.nvim opens a unified diff of ours (`git show :2:path`) vs
-theirs (`git show :3:path`) with full treesitter and intra-line highlighting.
-
-The same conflict resolution keymaps (`doo`/`dot`/`dob`/`don`/`]x`/`[x`)
-are available on the diff buffer. They resolve conflicts in the working
-file by matching diff hunks to conflict markers:
-
-- `doo` replaces the conflict region with ours content
-- `dot` replaces the conflict region with theirs content
-- `dob` replaces with both (ours then theirs)
-- `don` removes the conflict region entirely
-- `]x`/`[x` navigate between unresolved conflict hunks
-
-Resolved hunks are marked with `(resolved)` virtual text. Hunks that
-correspond to auto-merged content (no conflict markers) show an
-informational notification and are left unchanged.
-
-The working file buffer is modified in place; save it when ready.
-Phase 1 inline conflict highlights (see |diffs-conflict|) are refreshed
-automatically after each resolution.
-
 ==============================================================================
 API                                                                *diffs-api*
 
@@ -604,13 +489,12 @@ 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()|
-   - `DiffsClear` extmarks at priority 198 clear underlying diff foreground
+   - `Normal` extmarks at priority 198 clear underlying diff foreground
-   - Syntax highlights are applied as extmarks at priority 199
+   - Background extmarks (`DiffsAdd`/`DiffsDelete`) at priority 199
-   - Background extmarks (`DiffsAdd`/`DiffsDelete`) at priority 200
+   - 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
-   - All priorities are configurable via |diffs.PrioritiesConfig|
 4. Re-highlighting occurs on `TextChanged` (debounced) and `Syntax` events
 
 Diff mode views: ~
@@ -625,10 +509,15 @@ KNOWN LIMITATIONS                                       *diffs-limitations*
 
 Incomplete Syntax Context ~
                                                       *diffs-syntax-context*
-Treesitter parses each diff hunk in isolation. Context lines within the hunk
+Treesitter parses each diff hunk in isolation. To provide surrounding code
-(lines with a ` ` prefix) provide syntactic context for the parser. In rare
+context, diffs.nvim reads lines from disk before and after each hunk
-cases, hunks that start or end mid-expression may produce imperfect highlights
+(see |diffs.ContextConfig|, enabled by default). This resolves most boundary
-due to treesitter error recovery.
+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*
@@ -746,10 +635,6 @@ Conflict highlights: ~
                                                       *DiffsConflictBaseNr*
     DiffsConflictBaseNr Line number for base content lines (diff3).
 
-                                                    *DiffsConflictActions*
-    DiffsConflictActions Dimmed foreground (no bold) for the codelens-style
-                        action line shown when `show_actions` is true.
-
 Diff mode window highlights: ~
 These are used for |winhighlight| remapping in `&diff` windows.
 

lua/diffs/commands.lua

@@ -36,24 +36,6 @@ function M.find_hunk_line(diff_lines, hunk_position)
   return nil
 end
 
----@param lines string[]
----@return string[]
-function M.filter_combined_diffs(lines)
-  local result = {}
-  local skip = false
-  for _, line in ipairs(lines) do
-    if line:match('^diff %-%-cc ') then
-      skip = true
-    elseif line:match('^diff %-%-git ') then
-      skip = false
-    end
-    if not skip then
-      table.insert(result, line)
-    end
-  end
-  return result
-end
-
 ---@param old_lines string[]
 ---@param new_lines string[]
 ---@param old_name string
@@ -87,33 +69,6 @@ local function generate_unified_diff(old_lines, new_lines, old_name, new_name)
   return result
 end
 
----@param raw_lines string[]
----@param repo_root string
----@return string[]
-local function replace_combined_diffs(raw_lines, repo_root)
-  local unmerged_files = {}
-  for _, line in ipairs(raw_lines) do
-    local cc_file = line:match('^diff %-%-cc (.+)$')
-    if cc_file then
-      table.insert(unmerged_files, cc_file)
-    end
-  end
-
-  local result = M.filter_combined_diffs(raw_lines)
-
-  for _, filename in ipairs(unmerged_files) do
-    local filepath = repo_root .. '/' .. filename
-    local old_lines = git.get_file_content(':2', filepath) or {}
-    local new_lines = git.get_file_content(':3', filepath) or {}
-    local diff_lines = generate_unified_diff(old_lines, new_lines, filename, filename)
-    for _, dl in ipairs(diff_lines) do
-      table.insert(result, dl)
-    end
-  end
-
-  return result
-end
-
 ---@param revision? string
 ---@param vertical? boolean
 function M.gdiff(revision, vertical)
@@ -183,7 +138,6 @@ end
 ---@field vertical? boolean
 ---@field staged? boolean
 ---@field untracked? boolean
----@field unmerged? boolean
 ---@field old_filepath? string
 ---@field hunk_position? { hunk_header: string, offset: integer }
 
@@ -203,17 +157,7 @@ function M.gdiff_file(filepath, opts)
   local old_lines, new_lines, err
   local diff_label
 
-  if opts.unmerged then
+  if opts.untracked then
-    old_lines = git.get_file_content(':2', filepath)
-    if not old_lines then
-      old_lines = {}
-    end
-    new_lines = git.get_file_content(':3', filepath)
-    if not new_lines then
-      new_lines = {}
-    end
-    diff_label = 'unmerged'
-  elseif opts.untracked then
     old_lines = {}
     new_lines, err = git.get_working_content(filepath)
     if not new_lines then
@@ -292,14 +236,6 @@ function M.gdiff_file(filepath, opts)
   end
 
   M.setup_diff_buf(diff_buf)
-
-  if diff_label == 'unmerged' then
-    vim.api.nvim_buf_set_var(diff_buf, 'diffs_unmerged', true)
-    vim.api.nvim_buf_set_var(diff_buf, 'diffs_working_path', filepath)
-    local conflict_config = require('diffs').get_conflict_config()
-    require('diffs.merge').setup_keymaps(diff_buf, conflict_config)
-  end
-
   dbg('opened diff buffer %d for %s (%s)', diff_buf, rel_path, diff_label)
 
   vim.schedule(function()
@@ -327,8 +263,6 @@ function M.gdiff_section(repo_root, opts)
     return
   end
 
-  result = replace_combined_diffs(result, repo_root)
-
   if #result == 0 then
     vim.notify('[diffs.nvim]: no changes in section', vim.log.levels.INFO)
     return
@@ -391,8 +325,6 @@ function M.read_buffer(bufnr)
     if vim.v.shell_error ~= 0 then
       diff_lines = {}
     end
-
-    diff_lines = replace_combined_diffs(diff_lines, repo_root)
   else
     local abs_path = repo_root .. '/' .. path
 
@@ -402,10 +334,7 @@ function M.read_buffer(bufnr)
 
     local old_lines, new_lines
 
-    if label == 'unmerged' then
+    if label == 'untracked' then
-      old_lines = git.get_file_content(':2', abs_path) or {}
-      new_lines = git.get_file_content(':3', abs_path) or {}
-    elseif label == 'untracked' then
       old_lines = {}
       new_lines = git.get_working_content(abs_path) or {}
     elseif label == 'staged' then

lua/diffs/conflict.lua

@@ -20,6 +20,8 @@ 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)
@@ -90,17 +92,6 @@ local function parse_buffer(bufnr)
   return M.parse(lines)
 end
 
----@param side string
----@param config diffs.ConflictConfig
----@return string?
-local function get_virtual_text_label(side, config)
-  if config.format_virtual_text then
-    local keymap = side == 'ours' and config.keymaps.ours or config.keymaps.theirs
-    return config.format_virtual_text(side, keymap)
-  end
-  return side == 'ours' and 'current' or 'incoming'
-end
-
 ---@param bufnr integer
 ---@param regions diffs.ConflictRegion[]
 ---@param config diffs.ConflictConfig
@@ -112,41 +103,14 @@ local function apply_highlights(bufnr, regions, config)
       end_row = region.marker_ours + 1,
       hl_group = 'DiffsConflictMarker',
       hl_eol = true,
-      priority = config.priority,
+      priority = PRIORITY_LINE_BG,
     })
 
     if config.show_virtual_text then
-      local ours_label = get_virtual_text_label('ours', config)
+      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_ours, 0, {
-      if ours_label then
+        virt_text = { { ' (current)', 'DiffsConflictMarker' } },
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_ours, 0, {
+        virt_text_pos = 'eol',
-          virt_text = { { ' (' .. ours_label .. ')', 'DiffsConflictMarker' } },
+      })
-          virt_text_pos = 'eol',
-        })
-      end
-    end
-
-    if config.show_actions then
-      local parts = {}
-      local actions = {
-        { 'Current', config.keymaps.ours },
-        { 'Incoming', config.keymaps.theirs },
-        { 'Both', config.keymaps.both },
-        { 'None', config.keymaps.none },
-      }
-      for _, action in ipairs(actions) do
-        if action[2] then
-          if #parts > 0 then
-            table.insert(parts, { ' \226\148\130 ', 'DiffsConflictActions' })
-          end
-          table.insert(parts, { ('%s (%s)'):format(action[1], action[2]), 'DiffsConflictActions' })
-        end
-      end
-      if #parts > 0 then
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_ours, 0, {
-          virt_lines = { parts },
-          virt_lines_above = true,
-        })
-      end
     end
 
     for line = region.ours_start, region.ours_end - 1 do
@@ -154,11 +118,11 @@ local function apply_highlights(bufnr, regions, config)
         end_row = line + 1,
         hl_group = 'DiffsConflictOurs',
         hl_eol = true,
-        priority = config.priority,
+        priority = PRIORITY_LINE_BG,
       })
       pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
         number_hl_group = 'DiffsConflictOursNr',
-        priority = config.priority,
+        priority = PRIORITY_LINE_BG,
       })
     end
 
@@ -167,7 +131,7 @@ local function apply_highlights(bufnr, regions, config)
         end_row = region.marker_base + 1,
         hl_group = 'DiffsConflictMarker',
         hl_eol = true,
-        priority = config.priority,
+        priority = PRIORITY_LINE_BG,
       })
 
       for line = region.base_start, region.base_end - 1 do
@@ -175,11 +139,11 @@ local function apply_highlights(bufnr, regions, config)
           end_row = line + 1,
           hl_group = 'DiffsConflictBase',
           hl_eol = true,
-          priority = config.priority,
+          priority = PRIORITY_LINE_BG,
         })
         pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
           number_hl_group = 'DiffsConflictBaseNr',
-          priority = config.priority,
+          priority = PRIORITY_LINE_BG,
         })
       end
     end
@@ -188,7 +152,7 @@ local function apply_highlights(bufnr, regions, config)
       end_row = region.marker_sep + 1,
       hl_group = 'DiffsConflictMarker',
       hl_eol = true,
-      priority = config.priority,
+      priority = PRIORITY_LINE_BG,
     })
 
     for line = region.theirs_start, region.theirs_end - 1 do
@@ -196,11 +160,11 @@ local function apply_highlights(bufnr, regions, config)
         end_row = line + 1,
         hl_group = 'DiffsConflictTheirs',
         hl_eol = true,
-        priority = config.priority,
+        priority = PRIORITY_LINE_BG,
       })
       pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, line, 0, {
         number_hl_group = 'DiffsConflictTheirsNr',
-        priority = config.priority,
+        priority = PRIORITY_LINE_BG,
       })
     end
 
@@ -208,17 +172,14 @@ local function apply_highlights(bufnr, regions, config)
       end_row = region.marker_theirs + 1,
       hl_group = 'DiffsConflictMarker',
       hl_eol = true,
-      priority = config.priority,
+      priority = PRIORITY_LINE_BG,
     })
 
     if config.show_virtual_text then
-      local theirs_label = get_virtual_text_label('theirs', config)
+      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_theirs, 0, {
-      if theirs_label then
+        virt_text = { { ' (incoming)', 'DiffsConflictMarker' } },
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, region.marker_theirs, 0, {
+        virt_text_pos = 'eol',
-          virt_text = { { ' (' .. theirs_label .. ')', 'DiffsConflictMarker' } },
+      })
-          virt_text_pos = 'eol',
-        })
-      end
     end
   end
 end
@@ -238,7 +199,7 @@ end
 ---@param bufnr integer
 ---@param region diffs.ConflictRegion
 ---@param replacement string[]
-function M.replace_region(bufnr, region, replacement)
+local function replace_region(bufnr, region, replacement)
   vim.api.nvim_buf_set_lines(
     bufnr,
     region.marker_ours,
@@ -250,7 +211,7 @@ end
 
 ---@param bufnr integer
 ---@param config diffs.ConflictConfig
-function M.refresh(bufnr, config)
+local function refresh(bufnr, config)
   local regions = parse_buffer(bufnr)
   if #regions == 0 then
     vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
@@ -283,8 +244,8 @@ function M.resolve_ours(bufnr, config)
     return
   end
   local lines = vim.api.nvim_buf_get_lines(bufnr, region.ours_start, region.ours_end, false)
-  M.replace_region(bufnr, region, lines)
+  replace_region(bufnr, region, lines)
-  M.refresh(bufnr, config)
+  refresh(bufnr, config)
 end
 
 ---@param bufnr integer
@@ -301,8 +262,8 @@ function M.resolve_theirs(bufnr, config)
     return
   end
   local lines = vim.api.nvim_buf_get_lines(bufnr, region.theirs_start, region.theirs_end, false)
-  M.replace_region(bufnr, region, lines)
+  replace_region(bufnr, region, lines)
-  M.refresh(bufnr, config)
+  refresh(bufnr, config)
 end
 
 ---@param bufnr integer
@@ -327,8 +288,8 @@ function M.resolve_both(bufnr, config)
   for _, l in ipairs(theirs) do
     table.insert(combined, l)
   end
-  M.replace_region(bufnr, region, combined)
+  replace_region(bufnr, region, combined)
-  M.refresh(bufnr, config)
+  refresh(bufnr, config)
 end
 
 ---@param bufnr integer
@@ -344,8 +305,8 @@ function M.resolve_none(bufnr, config)
   if not region then
     return
   end
-  M.replace_region(bufnr, region, {})
+  replace_region(bufnr, region, {})
-  M.refresh(bufnr, config)
+  refresh(bufnr, config)
 end
 
 ---@param bufnr integer
@@ -362,7 +323,6 @@ function M.goto_next(bufnr)
       return
     end
   end
-  vim.notify('[diffs.nvim]: wrapped to first conflict', vim.log.levels.INFO)
   vim.api.nvim_win_set_cursor(0, { regions[1].marker_ours + 1, 0 })
 end
 
@@ -380,7 +340,6 @@ function M.goto_prev(bufnr)
       return
     end
   end
-  vim.notify('[diffs.nvim]: wrapped to last conflict', vim.log.levels.INFO)
   vim.api.nvim_win_set_cursor(0, { regions[#regions].marker_ours + 1, 0 })
 end
 
@@ -458,7 +417,7 @@ function M.attach(bufnr, config)
       if not attached_buffers[bufnr] then
         return true
       end
-      M.refresh(bufnr, config)
+      refresh(bufnr, config)
     end,
   })
 

lua/diffs/fugitive.lua

@@ -26,65 +26,20 @@ function M.get_section_at_line(bufnr, lnum)
   return nil
 end
 
----@param s string
----@return string
-local function unquote(s)
-  if s:sub(1, 1) ~= '"' then
-    return s
-  end
-  local inner = s:sub(2, -2)
-  local result = {}
-  local i = 1
-  while i <= #inner do
-    if inner:sub(i, i) == '\\' and i < #inner then
-      local next_char = inner:sub(i + 1, i + 1)
-      if next_char == 'n' then
-        table.insert(result, '\n')
-        i = i + 2
-      elseif next_char == 't' then
-        table.insert(result, '\t')
-        i = i + 2
-      elseif next_char == '"' then
-        table.insert(result, '"')
-        i = i + 2
-      elseif next_char == '\\' then
-        table.insert(result, '\\')
-        i = i + 2
-      elseif next_char:match('%d') then
-        local oct = inner:match('^(%d%d%d)', i + 1)
-        if oct then
-          table.insert(result, string.char(tonumber(oct, 8)))
-          i = i + 4
-        else
-          table.insert(result, next_char)
-          i = i + 2
-        end
-      else
-        table.insert(result, next_char)
-        i = i + 2
-      end
-    else
-      table.insert(result, inner:sub(i, i))
-      i = i + 1
-    end
-  end
-  return table.concat(result)
-end
-
 ---@param line string
----@return string?, string?, 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 unquote(vim.trim(new)), unquote(vim.trim(old)), 'R'
+    return vim.trim(new), vim.trim(old)
   end
 
-  local status, filename = line:match('^([MADRCU?])[MADRCU%s]*%s+(.+)$')
+  local filename = line:match('^[MADRCU?][MADRCU%s]*%s+(.+)$')
-  if status and filename then
+  if filename then
-    return unquote(vim.trim(filename)), nil, status
+    return vim.trim(filename), nil
   end
 
-  return nil, nil, nil
+  return nil, nil
 end
 
 ---@param line string
@@ -102,34 +57,34 @@ end
 
 ---@param bufnr integer
 ---@param lnum integer
----@return string?, diffs.FugitiveSection, boolean, string?, string?
+---@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, nil
+    return nil, nil, false, nil
   end
 
   local section_header = parse_section_header(current_line)
   if section_header then
-    return nil, section_header, true, nil, nil
+    return nil, section_header, true, nil
   end
 
-  local filename, old_filename, status = parse_file_line(current_line)
+  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, status
+    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, status = parse_file_line(prev_line)
+      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, status
+        return filename, section, false, old_filename
       end
       if prev_line:match('^%w+ %(') or prev_line == '' then
         break
@@ -137,7 +92,7 @@ function M.get_file_at_line(bufnr, lnum)
     end
   end
 
-  return nil, nil, false, nil, nil
+  return nil, nil, false, nil
 end
 
 ---@class diffs.HunkPosition
@@ -195,7 +150,7 @@ 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, status = M.get_file_at_line(bufnr, lnum)
+  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
@@ -237,7 +192,6 @@ function M.diff_file_under_cursor(vertical)
     vertical = vertical,
     staged = section == 'staged',
     untracked = section == 'untracked',
-    unmerged = status == 'U',
     old_filepath = old_filepath,
     hunk_position = hunk_position,
   })

lua/diffs/git.lua

@@ -1,19 +1,13 @@
 local M = {}
 
-local repo_root_cache = {}
-
 ---@param filepath string
 ---@return string?
 function M.get_repo_root(filepath)
   local dir = vim.fn.fnamemodify(filepath, ':h')
-  if repo_root_cache[dir] ~= nil then
-    return repo_root_cache[dir]
-  end
   local result = vim.fn.systemlist({ 'git', '-C', dir, 'rev-parse', '--show-toplevel' })
   if vim.v.shell_error ~= 0 then
     return nil
   end
-  repo_root_cache[dir] = result[1]
   return result[1]
 end
 

lua/diffs/highlight.lua

@@ -3,6 +3,38 @@ 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
 ---@param hunk diffs.Hunk
@@ -10,9 +42,8 @@ local diff = require('diffs.diff')
 ---@param text string
 ---@param lang string
 ---@param context_lines? string[]
----@param priorities diffs.PrioritiesConfig
 ---@return integer
-local function highlight_text(bufnr, ns, hunk, col_offset, text, lang, context_lines, priorities)
+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')
@@ -46,7 +77,7 @@ local function highlight_text(bufnr, ns, hunk, col_offset, text, lang, context_l
       local buf_sc = col_offset + sc
       local buf_ec = col_offset + ec
 
-      local priority = lang == 'diff' and (tonumber(metadata.priority) or 100) or priorities.syntax
+      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,
@@ -72,7 +103,6 @@ end
 ---@param line_map table<integer, integer>
 ---@param col_offset integer
 ---@param covered_lines? table<integer, true>
----@param priorities diffs.PrioritiesConfig
 ---@return integer
 local function highlight_treesitter(
   bufnr,
@@ -81,8 +111,7 @@ local function highlight_treesitter(
   lang,
   line_map,
   col_offset,
-  covered_lines,
+  covered_lines
-  priorities
 )
   local code = table.concat(code_lines, '\n')
   if code == '' then
@@ -123,7 +152,7 @@ local function highlight_treesitter(
           local buf_ec = ec + col_offset
 
           local priority = tree_lang == 'diff' and (tonumber(metadata.priority) or 100)
-            or priorities.syntax
+            or PRIORITY_SYNTAX
 
           pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
             end_row = buf_er,
@@ -190,17 +219,8 @@ end
 ---@param code_lines string[]
 ---@param covered_lines? table<integer, true>
 ---@param leading_offset? integer
----@param priorities diffs.PrioritiesConfig
 ---@return integer
-local function highlight_vim_syntax(
+local function highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines, leading_offset)
-  bufnr,
-  ns,
-  hunk,
-  code_lines,
-  covered_lines,
-  leading_offset,
-  priorities
-)
   local ft = hunk.ft
   if not ft then
     return 0
@@ -218,7 +238,7 @@ local function highlight_vim_syntax(
 
   local spans = {}
 
-  pcall(vim.api.nvim_buf_call, scratch, function()
+  vim.api.nvim_buf_call(scratch, function()
     vim.cmd('setlocal syntax=' .. ft)
     vim.cmd('redraw')
 
@@ -236,19 +256,18 @@ local function highlight_vim_syntax(
     spans = M.coalesce_syntax_spans(query_fn, code_lines)
   end)
 
-  pcall(vim.api.nvim_buf_delete, scratch, { force = true })
+  vim.api.nvim_buf_delete(scratch, { force = true })
 
   local hunk_line_count = #hunk.lines
-  local col_off = (hunk.prefix_width or 1) - 1
   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 + col_off, {
+      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start, {
-        end_col = span.col_end + col_off,
+        end_col = span.col_end,
         hl_group = span.hl_name,
-        priority = priorities.syntax,
+        priority = PRIORITY_SYNTAX,
       })
       extmark_count = extmark_count + 1
       if covered_lines then
@@ -265,8 +284,6 @@ end
 ---@param hunk diffs.Hunk
 ---@param opts diffs.HunkOpts
 function M.highlight_hunk(bufnr, ns, hunk, opts)
-  local p = opts.highlights.priorities
-  local pw = hunk.prefix_width or 1
   local use_ts = hunk.lang and opts.highlights.treesitter.enabled
   local use_vim = not use_ts and hunk.ft and opts.highlights.vim.enabled
 
@@ -286,6 +303,21 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
   ---@type table<integer, true>
   local covered_lines = {}
 
+  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)
+    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[]
@@ -297,17 +329,20 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
     ---@type table<integer, integer>
     local old_map = {}
 
-    for i, line in ipairs(hunk.lines) do
+    for _, pad_line in ipairs(leading) do
-      local prefix = line:sub(1, pw)
+      table.insert(new_code, pad_line)
-      local stripped = line:sub(pw + 1)
+      table.insert(old_code, pad_line)
-      local buf_line = hunk.start_line + i - 1
+    end
-      local has_add = prefix:find('+', 1, true) ~= nil
-      local has_del = prefix:find('-', 1, true) ~= nil
 
-      if has_add and not has_del then
+    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 has_del and not has_add then
+      elseif prefix == '-' then
         old_map[#old_code] = buf_line
         table.insert(old_code, stripped)
       else
@@ -317,17 +352,21 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
       end
     end
 
-    extmark_count =
+    for _, pad_line in ipairs(trailing) do
-      highlight_treesitter(bufnr, ns, new_code, hunk.lang, new_map, pw, covered_lines, p)
+      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, pw, covered_lines, p)
+      + 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 = p.clear,
+        priority = PRIORITY_CLEAR,
       })
       local header_extmarks = highlight_text(
         bufnr,
@@ -336,8 +375,7 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
         hunk.header_context_col,
         hunk.header_context,
         hunk.lang,
-        new_code,
+        new_code
-        p
       )
       if header_extmarks > 0 then
         dbg('header %s:%d applied %d extmarks', hunk.filename, hunk.start_line, header_extmarks)
@@ -347,10 +385,16 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
   elseif use_vim then
     ---@type string[]
     local code_lines = {}
-    for _, line in ipairs(hunk.lines) do
+    for _, pad_line in ipairs(leading) do
-      table.insert(code_lines, line:sub(pw + 1))
+      table.insert(code_lines, pad_line)
     end
-    extmark_count = highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines, 0, p)
+    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)
   end
 
   if
@@ -365,13 +409,13 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
       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, nil, p)
+      + 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 pw == 1 and #hunk.lines <= intra_cfg.max_lines then
+  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
@@ -405,35 +449,25 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
   for i, line in ipairs(hunk.lines) do
     local buf_line = hunk.start_line + i - 1
     local line_len = #line
-    local prefix = line:sub(1, pw)
+    local prefix = line:sub(1, 1)
-    local has_add = prefix:find('+', 1, true) ~= nil
-    local has_del = prefix:find('-', 1, true) ~= nil
-    local is_diff_line = has_add or has_del
-    local line_hl = is_diff_line and (has_add and 'DiffsAdd' or 'DiffsDelete') or nil
-    local number_hl = is_diff_line and (has_add and 'DiffsAddNr' or 'DiffsDeleteNr') or nil
 
-    local is_marker = false
+    local is_diff_line = prefix == '+' or prefix == '-'
-    if pw > 1 and line_hl and not prefix:find('[^+]') then
+    local line_hl = is_diff_line and (prefix == '+' and 'DiffsAdd' or 'DiffsDelete') or nil
-      local content = line:sub(pw + 1)
+    local number_hl = is_diff_line and (prefix == '+' and 'DiffsAddNr' or 'DiffsDeleteNr') or nil
-      is_marker = content:match('^<<<<<<<')
-        or content:match('^=======')
-        or content:match('^>>>>>>>')
-        or content:match('^|||||||')
-    end
 
     if opts.hide_prefix then
       local virt_hl = (opts.highlights.background and line_hl) or nil
       pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, {
-        virt_text = { { string.rep(' ', pw), virt_hl } },
+        virt_text = { { ' ', virt_hl } },
         virt_text_pos = 'overlay',
       })
     end
 
-    if line_len > pw and covered_lines[buf_line] then
+    if line_len > 1 and covered_lines[buf_line] then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, pw, {
+      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 1, {
         end_col = line_len,
         hl_group = 'DiffsClear',
-        priority = p.clear,
+        priority = PRIORITY_CLEAR,
       })
     end
 
@@ -442,26 +476,18 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
         end_row = buf_line + 1,
         hl_group = line_hl,
         hl_eol = true,
-        priority = p.line_bg,
+        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 = p.line_bg,
+          priority = PRIORITY_LINE_BG,
         })
       end
     end
 
-    if is_marker and line_len > pw then
-      pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, pw, {
-        end_col = line_len,
-        hl_group = 'DiffsConflictMarker',
-        priority = p.char_bg,
-      })
-    end
-
     if char_spans_by_line[i] then
-      local char_hl = has_add and 'DiffsAddText' or 'DiffsDeleteText'
+      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"',
@@ -475,7 +501,7 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
         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 = p.char_bg,
+          priority = PRIORITY_CHAR_BG,
         })
         if not ok then
           dbg('char extmark FAILED: %s', err)

lua/diffs/init.lua

@@ -15,12 +15,6 @@
 ---@field enabled boolean
 ---@field lines integer
 
----@class diffs.PrioritiesConfig
----@field clear integer
----@field syntax integer
----@field line_bg integer
----@field char_bg integer
-
 ---@class diffs.Highlights
 ---@field background boolean
 ---@field gutter boolean
@@ -30,7 +24,6 @@
 ---@field treesitter diffs.TreesitterConfig
 ---@field vim diffs.VimConfig
 ---@field intra diffs.IntraConfig
----@field priorities diffs.PrioritiesConfig
 
 ---@class diffs.FugitiveConfig
 ---@field horizontal string|false
@@ -48,9 +41,6 @@
 ---@field enabled boolean
 ---@field disable_diagnostics boolean
 ---@field show_virtual_text boolean
----@field format_virtual_text? fun(side: string, keymap: string|false): string?
----@field show_actions boolean
----@field priority integer
 ---@field keymaps diffs.ConflictKeymaps
 
 ---@class diffs.Config
@@ -129,12 +119,6 @@ local default_config = {
       algorithm = 'default',
       max_lines = 500,
     },
-    priorities = {
-      clear = 198,
-      syntax = 199,
-      line_bg = 200,
-      char_bg = 201,
-    },
   },
   fugitive = {
     horizontal = 'du',
@@ -144,8 +128,6 @@ local default_config = {
     enabled = true,
     disable_diagnostics = true,
     show_virtual_text = true,
-    show_actions = false,
-    priority = 200,
     keymaps = {
       ours = 'doo',
       theirs = 'dot',
@@ -218,9 +200,7 @@ local function create_debounced_highlight(bufnr)
           timer = nil
           t:close()
         end
-        if vim.api.nvim_buf_is_valid(bufnr) then
+        highlight_buffer(bufnr)
-          highlight_buffer(bufnr)
-        end
       end)
     )
   end
@@ -294,7 +274,6 @@ local function compute_highlight_groups()
   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, 'DiffsConflictActions', { default = true, fg = 0x808080 })
   vim.api.nvim_set_hl(
     0,
     'DiffsConflictOursNr',
@@ -343,7 +322,6 @@ local function init()
       ['highlights.treesitter'] = { opts.highlights.treesitter, 'table', true },
       ['highlights.vim'] = { opts.highlights.vim, 'table', true },
       ['highlights.intra'] = { opts.highlights.intra, 'table', true },
-      ['highlights.priorities'] = { opts.highlights.priorities, 'table', true },
     })
 
     if opts.highlights.context then
@@ -384,15 +362,6 @@ local function init()
         ['highlights.intra.max_lines'] = { opts.highlights.intra.max_lines, 'number', true },
       })
     end
-
-    if opts.highlights.priorities then
-      vim.validate({
-        ['highlights.priorities.clear'] = { opts.highlights.priorities.clear, 'number', true },
-        ['highlights.priorities.syntax'] = { opts.highlights.priorities.syntax, 'number', true },
-        ['highlights.priorities.line_bg'] = { opts.highlights.priorities.line_bg, 'number', true },
-        ['highlights.priorities.char_bg'] = { opts.highlights.priorities.char_bg, 'number', true },
-      })
-    end
   end
 
   if opts.fugitive then
@@ -419,9 +388,6 @@ local function init()
       ['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.format_virtual_text'] = { opts.conflict.format_virtual_text, 'function', true },
-      ['conflict.show_actions'] = { opts.conflict.show_actions, 'boolean', true },
-      ['conflict.priority'] = { opts.conflict.priority, 'number', true },
       ['conflict.keymaps'] = { opts.conflict.keymaps, 'table', true },
     })
 
@@ -483,17 +449,6 @@ local function init()
   then
     error('diffs: highlights.blend_alpha must be >= 0 and <= 1')
   end
-  if opts.highlights and opts.highlights.priorities then
-    for _, key in ipairs({ 'clear', 'syntax', 'line_bg', 'char_bg' }) do
-      local v = opts.highlights.priorities[key]
-      if v and v < 0 then
-        error('diffs: highlights.priorities.' .. key .. ' must be >= 0')
-      end
-    end
-  end
-  if opts.conflict and opts.conflict.priority and opts.conflict.priority < 0 then
-    error('diffs: conflict.priority must be >= 0')
-  end
 
   config = vim.tbl_deep_extend('force', default_config, opts)
   log.set_enabled(config.debug)

lua/diffs/lib.lua

@@ -8,9 +8,6 @@ local cached_handle = nil
 ---@type boolean
 local download_in_progress = false
 
----@type fun(handle: table?)[]
-local pending_callbacks = {}
-
 ---@return string
 local function get_os()
   local os_name = jit.os:lower()
@@ -167,10 +164,9 @@ function M.ensure(callback)
     return
   end
 
-  table.insert(pending_callbacks, callback)
-
   if download_in_progress then
-    dbg('download already in progress, queued callback')
+    dbg('download already in progress')
+    callback(nil)
     return
   end
 
@@ -196,25 +192,21 @@ function M.ensure(callback)
   vim.system(cmd, {}, function(result)
     download_in_progress = false
     vim.schedule(function()
-      local handle = nil
       if result.code ~= 0 then
         vim.notify('[diffs] failed to download libvscode_diff', vim.log.levels.WARN)
         dbg('curl failed: %s', result.stderr or '')
-      else
+        callback(nil)
-        local f = io.open(version_path(), 'w')
+        return
-        if f then
-          f:write(EXPECTED_VERSION)
-          f:close()
-        end
-        vim.notify('[diffs] libvscode_diff downloaded', vim.log.levels.INFO)
-        handle = M.load()
       end
 
-      local cbs = pending_callbacks
+      local f = io.open(version_path(), 'w')
-      pending_callbacks = {}
+      if f then
-      for _, cb in ipairs(cbs) do
+        f:write(EXPECTED_VERSION)
-        cb(handle)
+        f:close()
       end
+
+      vim.notify('[diffs] libvscode_diff downloaded', vim.log.levels.INFO)
+      callback(M.load())
     end)
   end)
 end

lua/diffs/merge.lua

@@ -1,418 +0,0 @@
-local M = {}
-
-local conflict = require('diffs.conflict')
-
-local ns = vim.api.nvim_create_namespace('diffs-merge')
-
----@type table<integer, table<integer, true>>
-local resolved_hunks = {}
-
----@class diffs.MergeHunkInfo
----@field index integer
----@field start_line integer
----@field end_line integer
----@field del_lines string[]
----@field add_lines string[]
-
----@param bufnr integer
----@return diffs.MergeHunkInfo[]
-function M.parse_hunks(bufnr)
-  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-  local hunks = {}
-  local current = nil
-
-  for i, line in ipairs(lines) do
-    local idx = i - 1
-    if line:match('^@@') then
-      if current then
-        current.end_line = idx - 1
-        table.insert(hunks, current)
-      end
-      current = {
-        index = #hunks + 1,
-        start_line = idx,
-        end_line = idx,
-        del_lines = {},
-        add_lines = {},
-      }
-    elseif current then
-      local prefix = line:sub(1, 1)
-      if prefix == '-' then
-        table.insert(current.del_lines, line:sub(2))
-      elseif prefix == '+' then
-        table.insert(current.add_lines, line:sub(2))
-      elseif prefix ~= ' ' and prefix ~= '\\' then
-        current.end_line = idx - 1
-        table.insert(hunks, current)
-        current = nil
-      end
-      if current then
-        current.end_line = idx
-      end
-    end
-  end
-
-  if current then
-    table.insert(hunks, current)
-  end
-
-  return hunks
-end
-
----@param bufnr integer
----@return diffs.MergeHunkInfo?
-function M.find_hunk_at_cursor(bufnr)
-  local hunks = M.parse_hunks(bufnr)
-  local cursor_line = vim.api.nvim_win_get_cursor(0)[1] - 1
-
-  for _, hunk in ipairs(hunks) do
-    if cursor_line >= hunk.start_line and cursor_line <= hunk.end_line then
-      return hunk
-    end
-  end
-
-  return nil
-end
-
----@param hunk diffs.MergeHunkInfo
----@param working_bufnr integer
----@return diffs.ConflictRegion?
-function M.match_hunk_to_conflict(hunk, working_bufnr)
-  local working_lines = vim.api.nvim_buf_get_lines(working_bufnr, 0, -1, false)
-  local regions = conflict.parse(working_lines)
-
-  for _, region in ipairs(regions) do
-    local ours_lines = {}
-    for line = region.ours_start + 1, region.ours_end do
-      table.insert(ours_lines, working_lines[line])
-    end
-
-    if #ours_lines == #hunk.del_lines then
-      local match = true
-      for j = 1, #ours_lines do
-        if ours_lines[j] ~= hunk.del_lines[j] then
-          match = false
-          break
-        end
-      end
-      if match then
-        return region
-      end
-    end
-  end
-
-  return nil
-end
-
----@param diff_bufnr integer
----@return integer?
-function M.get_or_load_working_buf(diff_bufnr)
-  local ok, working_path = pcall(vim.api.nvim_buf_get_var, diff_bufnr, 'diffs_working_path')
-  if not ok or not working_path then
-    return nil
-  end
-
-  local existing = vim.fn.bufnr(working_path)
-  if existing ~= -1 then
-    return existing
-  end
-
-  local bufnr = vim.fn.bufadd(working_path)
-  vim.fn.bufload(bufnr)
-  return bufnr
-end
-
----@param diff_bufnr integer
----@param hunk_index integer
-local function mark_resolved(diff_bufnr, hunk_index)
-  if not resolved_hunks[diff_bufnr] then
-    resolved_hunks[diff_bufnr] = {}
-  end
-  resolved_hunks[diff_bufnr][hunk_index] = true
-end
-
----@param diff_bufnr integer
----@param hunk_index integer
----@return boolean
-function M.is_resolved(diff_bufnr, hunk_index)
-  return resolved_hunks[diff_bufnr] and resolved_hunks[diff_bufnr][hunk_index] or false
-end
-
----@param diff_bufnr integer
----@param hunk diffs.MergeHunkInfo
-local function add_resolved_virtual_text(diff_bufnr, hunk)
-  pcall(vim.api.nvim_buf_set_extmark, diff_bufnr, ns, hunk.start_line, 0, {
-    virt_text = { { ' (resolved)', 'Comment' } },
-    virt_text_pos = 'eol',
-  })
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_ours(bufnr, config)
-  local hunk = M.find_hunk_at_cursor(bufnr)
-  if not hunk then
-    return
-  end
-  if M.is_resolved(bufnr, hunk.index) then
-    vim.notify('[diffs.nvim]: hunk already resolved', vim.log.levels.INFO)
-    return
-  end
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-  local region = M.match_hunk_to_conflict(hunk, working_bufnr)
-  if not region then
-    vim.notify('[diffs.nvim]: hunk does not correspond to a conflict region', vim.log.levels.INFO)
-    return
-  end
-  local lines = vim.api.nvim_buf_get_lines(working_bufnr, region.ours_start, region.ours_end, false)
-  conflict.replace_region(working_bufnr, region, lines)
-  conflict.refresh(working_bufnr, config)
-  mark_resolved(bufnr, hunk.index)
-  add_resolved_virtual_text(bufnr, hunk)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_theirs(bufnr, config)
-  local hunk = M.find_hunk_at_cursor(bufnr)
-  if not hunk then
-    return
-  end
-  if M.is_resolved(bufnr, hunk.index) then
-    vim.notify('[diffs.nvim]: hunk already resolved', vim.log.levels.INFO)
-    return
-  end
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-  local region = M.match_hunk_to_conflict(hunk, working_bufnr)
-  if not region then
-    vim.notify('[diffs.nvim]: hunk does not correspond to a conflict region', vim.log.levels.INFO)
-    return
-  end
-  local lines =
-    vim.api.nvim_buf_get_lines(working_bufnr, region.theirs_start, region.theirs_end, false)
-  conflict.replace_region(working_bufnr, region, lines)
-  conflict.refresh(working_bufnr, config)
-  mark_resolved(bufnr, hunk.index)
-  add_resolved_virtual_text(bufnr, hunk)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_both(bufnr, config)
-  local hunk = M.find_hunk_at_cursor(bufnr)
-  if not hunk then
-    return
-  end
-  if M.is_resolved(bufnr, hunk.index) then
-    vim.notify('[diffs.nvim]: hunk already resolved', vim.log.levels.INFO)
-    return
-  end
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-  local region = M.match_hunk_to_conflict(hunk, working_bufnr)
-  if not region then
-    vim.notify('[diffs.nvim]: hunk does not correspond to a conflict region', vim.log.levels.INFO)
-    return
-  end
-  local ours = vim.api.nvim_buf_get_lines(working_bufnr, region.ours_start, region.ours_end, false)
-  local theirs =
-    vim.api.nvim_buf_get_lines(working_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
-  conflict.replace_region(working_bufnr, region, combined)
-  conflict.refresh(working_bufnr, config)
-  mark_resolved(bufnr, hunk.index)
-  add_resolved_virtual_text(bufnr, hunk)
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.resolve_none(bufnr, config)
-  local hunk = M.find_hunk_at_cursor(bufnr)
-  if not hunk then
-    return
-  end
-  if M.is_resolved(bufnr, hunk.index) then
-    vim.notify('[diffs.nvim]: hunk already resolved', vim.log.levels.INFO)
-    return
-  end
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-  local region = M.match_hunk_to_conflict(hunk, working_bufnr)
-  if not region then
-    vim.notify('[diffs.nvim]: hunk does not correspond to a conflict region', vim.log.levels.INFO)
-    return
-  end
-  conflict.replace_region(working_bufnr, region, {})
-  conflict.refresh(working_bufnr, config)
-  mark_resolved(bufnr, hunk.index)
-  add_resolved_virtual_text(bufnr, hunk)
-end
-
----@param bufnr integer
-function M.goto_next(bufnr)
-  local hunks = M.parse_hunks(bufnr)
-  if #hunks == 0 then
-    return
-  end
-
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-
-  local cursor_line = vim.api.nvim_win_get_cursor(0)[1] - 1
-
-  local candidates = {}
-  for _, hunk in ipairs(hunks) do
-    if not M.is_resolved(bufnr, hunk.index) then
-      if M.match_hunk_to_conflict(hunk, working_bufnr) then
-        table.insert(candidates, hunk)
-      end
-    end
-  end
-
-  if #candidates == 0 then
-    return
-  end
-
-  for _, hunk in ipairs(candidates) do
-    if hunk.start_line > cursor_line then
-      vim.api.nvim_win_set_cursor(0, { hunk.start_line + 1, 0 })
-      return
-    end
-  end
-
-  vim.notify('[diffs.nvim]: wrapped to first hunk', vim.log.levels.INFO)
-  vim.api.nvim_win_set_cursor(0, { candidates[1].start_line + 1, 0 })
-end
-
----@param bufnr integer
-function M.goto_prev(bufnr)
-  local hunks = M.parse_hunks(bufnr)
-  if #hunks == 0 then
-    return
-  end
-
-  local working_bufnr = M.get_or_load_working_buf(bufnr)
-  if not working_bufnr then
-    return
-  end
-
-  local cursor_line = vim.api.nvim_win_get_cursor(0)[1] - 1
-
-  local candidates = {}
-  for _, hunk in ipairs(hunks) do
-    if not M.is_resolved(bufnr, hunk.index) then
-      if M.match_hunk_to_conflict(hunk, working_bufnr) then
-        table.insert(candidates, hunk)
-      end
-    end
-  end
-
-  if #candidates == 0 then
-    return
-  end
-
-  for i = #candidates, 1, -1 do
-    if candidates[i].start_line < cursor_line then
-      vim.api.nvim_win_set_cursor(0, { candidates[i].start_line + 1, 0 })
-      return
-    end
-  end
-
-  vim.notify('[diffs.nvim]: wrapped to last hunk', vim.log.levels.INFO)
-  vim.api.nvim_win_set_cursor(0, { candidates[#candidates].start_line + 1, 0 })
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-local function apply_hunk_hints(bufnr, config)
-  if not config.show_virtual_text then
-    return
-  end
-
-  local hunks = M.parse_hunks(bufnr)
-  for _, hunk in ipairs(hunks) do
-    if M.is_resolved(bufnr, hunk.index) then
-      add_resolved_virtual_text(bufnr, hunk)
-    else
-      local parts = {}
-      local actions = {
-        { 'current', config.keymaps.ours },
-        { 'incoming', config.keymaps.theirs },
-        { 'both', config.keymaps.both },
-        { 'none', config.keymaps.none },
-      }
-      for _, action in ipairs(actions) do
-        if action[2] then
-          if #parts > 0 then
-            table.insert(parts, { ' | ', 'Comment' })
-          end
-          table.insert(parts, { ('%s: %s'):format(action[2], action[1]), 'Comment' })
-        end
-      end
-      if #parts > 0 then
-        pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, hunk.start_line, 0, {
-          virt_text = parts,
-          virt_text_pos = 'eol',
-        })
-      end
-    end
-  end
-end
-
----@param bufnr integer
----@param config diffs.ConflictConfig
-function M.setup_keymaps(bufnr, config)
-  resolved_hunks[bufnr] = nil
-  vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
-
-  local km = config.keymaps
-
-  local maps = {
-    { km.ours, '<Plug>(diffs-merge-ours)' },
-    { km.theirs, '<Plug>(diffs-merge-theirs)' },
-    { km.both, '<Plug>(diffs-merge-both)' },
-    { km.none, '<Plug>(diffs-merge-none)' },
-    { km.next, '<Plug>(diffs-merge-next)' },
-    { km.prev, '<Plug>(diffs-merge-prev)' },
-  }
-
-  for _, map in ipairs(maps) do
-    if map[1] then
-      vim.keymap.set('n', map[1], map[2], { buffer = bufnr })
-    end
-  end
-
-  apply_hunk_hints(bufnr, config)
-
-  vim.api.nvim_create_autocmd('BufWipeout', {
-    buffer = bufnr,
-    callback = function()
-      resolved_hunks[bufnr] = nil
-    end,
-  })
-end
-
----@return integer
-function M.get_namespace()
-  return ns
-end
-
-return M

lua/diffs/parser.lua

@@ -12,7 +12,6 @@
 ---@field file_old_count integer?
 ---@field file_new_start integer?
 ---@field file_new_count integer?
----@field prefix_width integer
 ---@field repo_root string?
 
 local M = {}
@@ -134,8 +133,6 @@ function M.parse_buffer(bufnr)
   local hunk_lines = {}
   ---@type integer?
   local hunk_count = nil
-  ---@type integer
-  local hunk_prefix_width = 1
   ---@type integer?
   local header_start = nil
   ---@type string[]
@@ -159,7 +156,6 @@ function M.parse_buffer(bufnr)
         header_context = hunk_header_context,
         header_context_col = hunk_header_context_col,
         lines = hunk_lines,
-        prefix_width = hunk_prefix_width,
         file_old_start = file_old_start,
         file_old_count = file_old_count,
         file_new_start = file_new_start,
@@ -183,7 +179,7 @@ function M.parse_buffer(bufnr)
   end
 
   for i, line in ipairs(lines) do
-    local filename = line:match('^[MADRCU%?!]%s+(.+)$') or line:match('^diff %-%-git a/.+ b/(.+)$')
+    local filename = line:match('^[MADRC%?!]%s+(.+)$') or line:match('^diff %-%-git a/.+ b/(.+)$')
     if filename then
       flush_hunk()
       current_filename = filename
@@ -195,33 +191,22 @@ function M.parse_buffer(bufnr)
         dbg('file: %s -> ft: %s (no ts parser)', filename, current_ft)
       end
       hunk_count = 0
-      hunk_prefix_width = 1
       header_start = i
       header_lines = {}
-    elseif line:match('^@@+') then
+    elseif line:match('^@@.-@@') then
       flush_hunk()
       hunk_start = i
-      local at_prefix = line:match('^(@@+)')
+      local hs, hc, hs2, hc2 = line:match('^@@ %-(%d+),?(%d*) %+(%d+),?(%d*) @@')
-      hunk_prefix_width = #at_prefix - 1
+      if hs then
-      if #at_prefix == 2 then
+        file_old_start = tonumber(hs)
-        local hs, hc, hs2, hc2 = line:match('^@@ %-(%d+),?(%d*) %+(%d+),?(%d*) @@')
+        file_old_count = tonumber(hc) or 1
-        if hs then
+        file_new_start = tonumber(hs2)
-          file_old_start = tonumber(hs)
+        file_new_count = tonumber(hc2) or 1
-          file_old_count = tonumber(hc) or 1
-          file_new_start = tonumber(hs2)
-          file_new_count = tonumber(hc2) or 1
-        end
-      else
-        local hs2, hc2 = line:match('%+(%d+),?(%d*) @@')
-        if hs2 then
-          file_new_start = tonumber(hs2)
-          file_new_count = tonumber(hc2) or 1
-        end
       end
-      local at_end, context = line:match('^(@@+.-@@+%s*)(.*)')
+      local prefix, context = line:match('^(@@.-@@%s*)(.*)')
       if context and context ~= '' then
         hunk_header_context = context
-        hunk_header_context_col = #at_end
+        hunk_header_context_col = #prefix
       end
       if hunk_count then
         hunk_count = hunk_count + 1

plugin/diffs.lua

@@ -82,28 +82,3 @@ 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' })
-
-local function merge_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-merge-ours)', function()
-  merge_action(require('diffs.merge').resolve_ours)
-end, { desc = 'Accept ours in merge diff' })
-vim.keymap.set('n', '<Plug>(diffs-merge-theirs)', function()
-  merge_action(require('diffs.merge').resolve_theirs)
-end, { desc = 'Accept theirs in merge diff' })
-vim.keymap.set('n', '<Plug>(diffs-merge-both)', function()
-  merge_action(require('diffs.merge').resolve_both)
-end, { desc = 'Accept both in merge diff' })
-vim.keymap.set('n', '<Plug>(diffs-merge-none)', function()
-  merge_action(require('diffs.merge').resolve_none)
-end, { desc = 'Reject both in merge diff' })
-vim.keymap.set('n', '<Plug>(diffs-merge-next)', function()
-  require('diffs.merge').goto_next(vim.api.nvim_get_current_buf())
-end, { desc = 'Jump to next conflict hunk' })
-vim.keymap.set('n', '<Plug>(diffs-merge-prev)', function()
-  require('diffs.merge').goto_prev(vim.api.nvim_get_current_buf())
-end, { desc = 'Jump to previous conflict hunk' })

spec/commands_spec.lua

@@ -40,78 +40,6 @@ describe('commands', function()
     end)
   end)
 
-  describe('filter_combined_diffs', function()
-    it('strips diff --cc entries entirely', function()
-      local lines = {
-        'diff --cc main.lua',
-        'index d13ab94,b113aee..0000000',
-        '--- a/main.lua',
-        '+++ b/main.lua',
-        '@@@ -1,7 -1,7 +1,11 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-        '++=======',
-        '+   return 2',
-        '++>>>>>>> theirs',
-        '  end',
-      }
-      local result = commands.filter_combined_diffs(lines)
-      assert.are.equal(0, #result)
-    end)
-
-    it('preserves diff --git entries', function()
-      local lines = {
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,3 @@',
-        ' local M = {}',
-        '-local x = 1',
-        '+local x = 2',
-        ' return M',
-      }
-      local result = commands.filter_combined_diffs(lines)
-      assert.are.equal(8, #result)
-      assert.are.same(lines, result)
-    end)
-
-    it('strips combined but keeps unified in mixed output', function()
-      local lines = {
-        'diff --cc conflict.lua',
-        'index aaa,bbb..000',
-        '@@@ -1,1 -1,1 +1,5 @@@',
-        '++<<<<<<< HEAD',
-        'diff --git a/clean.lua b/clean.lua',
-        '--- a/clean.lua',
-        '+++ b/clean.lua',
-        '@@ -1,1 +1,1 @@',
-        '-old',
-        '+new',
-      }
-      local result = commands.filter_combined_diffs(lines)
-      assert.are.equal(6, #result)
-      assert.are.equal('diff --git a/clean.lua b/clean.lua', result[1])
-      assert.are.equal('+new', result[6])
-    end)
-
-    it('returns empty for empty input', function()
-      local result = commands.filter_combined_diffs({})
-      assert.are.equal(0, #result)
-    end)
-
-    it('returns empty when all entries are combined', function()
-      local lines = {
-        'diff --cc a.lua',
-        'some content',
-        'diff --cc b.lua',
-        'more content',
-      }
-      local result = commands.filter_combined_diffs(lines)
-      assert.are.equal(0, #result)
-    end)
-  end)
-
   describe('find_hunk_line', function()
     it('finds matching @@ header and returns target line', function()
       local diff_lines = {

spec/conflict_spec.lua

@@ -6,7 +6,6 @@ local function default_config(overrides)
     enabled = true,
     disable_diagnostics = false,
     show_virtual_text = true,
-    show_actions = false,
     keymaps = {
       ours = 'doo',
       theirs = 'dot',
@@ -235,6 +234,29 @@ describe('conflict', function()
       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',
@@ -509,33 +531,6 @@ describe('conflict', function()
       helpers.delete_buffer(bufnr)
     end)
 
-    it('goto_next notifies on wrap-around', 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 })
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('wrapped to first conflict') then
-          notified = true
-        end
-      end
-
-      conflict.goto_next(bufnr)
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
     it('goto_prev jumps to previous conflict', function()
       local bufnr = create_file_buffer({
         '<<<<<<< HEAD',
@@ -580,33 +575,6 @@ describe('conflict', function()
       helpers.delete_buffer(bufnr)
     end)
 
-    it('goto_prev notifies on wrap-around', 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 })
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('wrapped to last conflict') then
-          notified = true
-        end
-      end
-
-      conflict.goto_prev(bufnr)
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      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)
@@ -717,158 +685,4 @@ describe('conflict', function()
       helpers.delete_buffer(bufnr)
     end)
   end)
-
-  describe('virtual text formatting', function()
-    after_each(function()
-      conflict.detach(vim.api.nvim_get_current_buf())
-    end)
-
-    it('default labels show current and incoming without keymaps', 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 labels = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          table.insert(labels, mark[4].virt_text[1][1])
-        end
-      end
-      assert.are.equal(2, #labels)
-      assert.are.equal(' (current)', labels[1])
-      assert.are.equal(' (incoming)', labels[2])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('uses custom format_virtual_text function', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(
-        bufnr,
-        default_config({
-          format_virtual_text = function(side)
-            return side == 'ours' and 'OURS' or 'THEIRS'
-          end,
-        })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      local labels = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          table.insert(labels, mark[4].virt_text[1][1])
-        end
-      end
-      assert.are.equal(2, #labels)
-      assert.are.equal(' (OURS)', labels[1])
-      assert.are.equal(' (THEIRS)', labels[2])
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('hides label when format_virtual_text returns nil', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(
-        bufnr,
-        default_config({
-          format_virtual_text = function()
-            return nil
-          end,
-        })
-      )
-
-      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)
-  end)
-
-  describe('action lines', function()
-    after_each(function()
-      conflict.detach(vim.api.nvim_get_current_buf())
-    end)
-
-    it('adds virt_lines when show_actions is true', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(bufnr, default_config({ show_actions = true }))
-
-      local extmarks = get_extmarks(bufnr)
-      local virt_lines_count = 0
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_lines then
-          virt_lines_count = virt_lines_count + 1
-        end
-      end
-      assert.are.equal(1, virt_lines_count)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('omits disabled keymaps from action line', function()
-      local bufnr = create_file_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      })
-
-      conflict.attach(
-        bufnr,
-        default_config({ show_actions = true, keymaps = { both = false, none = false } })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_lines then
-          local line = mark[4].virt_lines[1]
-          local text = ''
-          for _, chunk in ipairs(line) do
-            text = text .. chunk[1]
-          end
-          assert.is_truthy(text:find('Current'))
-          assert.is_truthy(text:find('Incoming'))
-          assert.is_falsy(text:find('Both'))
-          assert.is_falsy(text:find('None'))
-        end
-      end
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
 end)

spec/fugitive_spec.lua

@@ -87,6 +87,28 @@ describe('fugitive', function()
       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)',
@@ -135,6 +157,28 @@ describe('fugitive', function()
       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)',
@@ -146,54 +190,77 @@ describe('fugitive', function()
       vim.api.nvim_buf_delete(buf, { force = true })
     end)
 
-    it('unquotes git-quoted filenames with spaces', function()
+    it('handles double extensions', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  "path with spaces/file.lua"',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('path with spaces/file.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('unquotes escaped quotes in filenames', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  "file\\"name.lua"',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('file"name.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('unquotes octal escapes in filenames', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  "\\303\\251le.lua"',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('\195\169le.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('passes through unquoted filenames unchanged', function()
-      local buf = create_status_buffer({
-        'Unstaged (1)',
-        'M  normal.lua',
-      })
-      local filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('normal.lua', filename)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('unquotes renamed files with quotes', function()
       local buf = create_status_buffer({
         'Staged (1)',
-        'R100 "old name.lua" -> "new name.lua"',
+        'M  test.spec.lua',
       })
       local filename, _, _, old_filename = fugitive.get_file_at_line(buf, 2)
-      assert.equals('new name.lua', filename)
+      assert.equals('test.spec.lua', filename)
-      assert.equals('old name.lua', old_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)
 
@@ -254,6 +321,30 @@ describe('fugitive', function()
       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)',
@@ -315,6 +406,22 @@ describe('fugitive', function()
       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)',

spec/highlight_spec.lua

@@ -13,7 +13,6 @@ describe('highlight', function()
       vim.api.nvim_set_hl(0, 'DiffsClear', { fg = normal.fg or 0xc0c0c0 })
       vim.api.nvim_set_hl(0, 'DiffsAdd', { bg = diff_add.bg })
       vim.api.nvim_set_hl(0, 'DiffsDelete', { bg = diff_delete.bg })
-      vim.api.nvim_set_hl(0, 'DiffsConflictMarker', { fg = 0x808080, bold = true })
     end)
 
     local function create_buffer(lines)
@@ -52,12 +51,6 @@ describe('highlight', function()
             algorithm = 'default',
             max_lines = 500,
           },
-          priorities = {
-            clear = 198,
-            syntax = 199,
-            line_bg = 200,
-            char_bg = 201,
-          },
         },
       }
       if overrides then
@@ -71,6 +64,27 @@ describe('highlight', function()
       return opts
     end
 
+    it('applies extmarks for lua code', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+
+      local extmarks = get_extmarks(bufnr)
+      assert.is_true(#extmarks > 0)
+      delete_buffer(bufnr)
+    end)
+
     it('applies DiffsClear extmarks to clear diff colors', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -176,6 +190,36 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('highlights header context when enabled', function()
+      local bufnr = create_buffer({
+        '@@ -10,3 +10,4 @@ function hello()',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        header_context = 'function hello()',
+        header_context_col = 18,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+
+      local extmarks = get_extmarks(bufnr)
+      local has_header_extmark = false
+      for _, mark in ipairs(extmarks) do
+        if mark[2] == 0 then
+          has_header_extmark = true
+          break
+        end
+      end
+      assert.is_true(has_header_extmark)
+      delete_buffer(bufnr)
+    end)
+
     it('highlights function keyword in header context', function()
       local bufnr = create_buffer({
         '@@ -5,3 +5,4 @@ function M.setup()',
@@ -236,6 +280,44 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('handles empty hunk lines', function()
+      local bufnr = create_buffer({
+        '@@ -1,0 +1,0 @@',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = {},
+      }
+
+      assert.has_no.errors(function()
+        highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+      end)
+      delete_buffer(bufnr)
+    end)
+
+    it('handles code that is just whitespace', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' ',
+        '+  ',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' ', '+  ' },
+      }
+
+      assert.has_no.errors(function()
+        highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+      end)
+      delete_buffer(bufnr)
+    end)
+
     it('applies overlay extmarks when hide_prefix enabled', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -263,6 +345,33 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('does not apply overlay extmarks when hide_prefix disabled', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(bufnr, ns, hunk, default_opts({ hide_prefix = false }))
+
+      local extmarks = get_extmarks(bufnr)
+      local overlay_count = 0
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].virt_text_pos == 'overlay' then
+          overlay_count = overlay_count + 1
+        end
+      end
+      assert.are.equal(0, overlay_count)
+      delete_buffer(bufnr)
+    end)
+
     it('applies DiffAdd background to + lines when background enabled', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -329,6 +438,39 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('does not apply background when background disabled', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { background = false } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local has_line_hl = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and (mark[4].hl_group == 'DiffsAdd' or mark[4].hl_group == 'DiffsDelete') then
+          has_line_hl = true
+          break
+        end
+      end
+      assert.is_false(has_line_hl)
+      delete_buffer(bufnr)
+    end)
+
     it('applies number_hl_group when gutter enabled', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -362,6 +504,72 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('does not apply number_hl_group when gutter disabled', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { background = true, gutter = false } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local has_number_hl = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].number_hl_group then
+          has_number_hl = true
+          break
+        end
+      end
+      assert.is_false(has_number_hl)
+      delete_buffer(bufnr)
+    end)
+
+    it('skips treesitter highlights when treesitter disabled', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { treesitter = { enabled = false }, background = true } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local has_ts_highlight = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].hl_group and mark[4].hl_group:match('^@') then
+          has_ts_highlight = true
+          break
+        end
+      end
+      assert.is_false(has_ts_highlight)
+      delete_buffer(bufnr)
+    end)
+
     it('still applies background when treesitter disabled', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -446,6 +654,40 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('skips vim fallback when vim.enabled is false', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        ft = 'abap',
+        lang = nil,
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { vim = { enabled = false } } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local has_syntax_hl = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].hl_group and mark[4].hl_group ~= 'DiffsClear' then
+          has_syntax_hl = true
+          break
+        end
+      end
+      assert.is_false(has_syntax_hl)
+      delete_buffer(bufnr)
+    end)
+
     it('respects vim.max_lines', function()
       local lines = { '@@ -1,100 +1,101 @@' }
       local hunk_lines = {}
@@ -658,6 +900,92 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('line bg priority > DiffsClear priority', function()
+      local bufnr = create_buffer({
+        '@@ -1,2 +1,1 @@',
+        '-local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { '-local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { background = true } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local clear_priority = nil
+      local line_bg_priority = nil
+      for _, mark in ipairs(extmarks) do
+        local d = mark[4]
+        if d and d.hl_group == 'DiffsClear' then
+          clear_priority = d.priority
+        end
+        if d and (d.hl_group == 'DiffsAdd' or d.hl_group == 'DiffsDelete') then
+          line_bg_priority = d.priority
+        end
+      end
+      assert.is_not_nil(clear_priority)
+      assert.is_not_nil(line_bg_priority)
+      assert.is_true(line_bg_priority > clear_priority)
+      delete_buffer(bufnr)
+    end)
+
+    it('char-level extmarks have higher priority than line bg', function()
+      vim.api.nvim_set_hl(0, 'DiffsAddText', { bg = 0x00FF00 })
+      vim.api.nvim_set_hl(0, 'DiffsDeleteText', { bg = 0xFF0000 })
+
+      local bufnr = create_buffer({
+        '@@ -1,2 +1,2 @@',
+        '-local x = 1',
+        '+local x = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { '-local x = 1', '+local x = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({
+          highlights = {
+            background = true,
+            intra = { enabled = true, algorithm = 'default', max_lines = 500 },
+          },
+        })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      local line_bg_priority = nil
+      local char_bg_priority = nil
+      for _, mark in ipairs(extmarks) do
+        local d = mark[4]
+        if d and (d.hl_group == 'DiffsAdd' or d.hl_group == 'DiffsDelete') then
+          line_bg_priority = d.priority
+        end
+        if d and (d.hl_group == 'DiffsAddText' or d.hl_group == 'DiffsDeleteText') then
+          char_bg_priority = d.priority
+        end
+      end
+      assert.is_not_nil(line_bg_priority)
+      assert.is_not_nil(char_bg_priority)
+      assert.is_true(char_bg_priority > line_bg_priority)
+      delete_buffer(bufnr)
+    end)
+
     it('creates char-level extmarks for changed characters', function()
       vim.api.nvim_set_hl(0, 'DiffsAddText', { bg = 0x00FF00 })
       vim.api.nvim_set_hl(0, 'DiffsDeleteText', { bg = 0xFF0000 })
@@ -701,6 +1029,38 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('does not create char-level extmarks when intra disabled', function()
+      local bufnr = create_buffer({
+        '@@ -1,2 +1,2 @@',
+        '-local x = 1',
+        '+local x = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { '-local x = 1', '+local x = 2' },
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({
+          highlights = { intra = { enabled = false, algorithm = 'default', max_lines = 500 } },
+        })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      for _, mark in ipairs(extmarks) do
+        local d = mark[4]
+        assert.is_not_equal('DiffsAddText', d and d.hl_group)
+        assert.is_not_equal('DiffsDeleteText', d and d.hl_group)
+      end
+      delete_buffer(bufnr)
+    end)
+
     it('does not create char-level extmarks for pure additions', function()
       vim.api.nvim_set_hl(0, 'DiffsAddText', { bg = 0x00FF00 })
 
@@ -797,6 +1157,142 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
+    it('context padding produces no extmarks on padding lines', function()
+      local repo_root = '/tmp/diffs-test-context'
+      vim.fn.mkdir(repo_root, 'p')
+
+      local f = io.open(repo_root .. '/test.lua', 'w')
+      f:write('local M = {}\n')
+      f:write('function M.hello()\n')
+      f:write('  return "hi"\n')
+      f:write('end\n')
+      f:write('return M\n')
+      f:close()
+
+      local bufnr = create_buffer({
+        '@@ -3,1 +3,2 @@',
+        ' return "hi"',
+        '+"bye"',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { '  return "hi"', '+"bye"' },
+        file_old_start = 3,
+        file_old_count = 1,
+        file_new_start = 3,
+        file_new_count = 2,
+        repo_root = repo_root,
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { context = { enabled = true, lines = 25 } } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      for _, mark in ipairs(extmarks) do
+        local row = mark[2]
+        assert.is_true(row >= 1 and row <= 2)
+      end
+
+      delete_buffer(bufnr)
+      os.remove(repo_root .. '/test.lua')
+      vim.fn.delete(repo_root, 'rf')
+    end)
+
+    it('context disabled matches behavior without padding', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+        file_new_start = 1,
+        file_new_count = 2,
+        repo_root = '/nonexistent',
+      }
+
+      highlight.highlight_hunk(
+        bufnr,
+        ns,
+        hunk,
+        default_opts({ highlights = { context = { enabled = false, lines = 0 } } })
+      )
+
+      local extmarks = get_extmarks(bufnr)
+      assert.is_true(#extmarks > 0)
+      delete_buffer(bufnr)
+    end)
+
+    it('gracefully handles missing file for context padding', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+        file_new_start = 1,
+        file_new_count = 2,
+        repo_root = '/nonexistent/path',
+      }
+
+      assert.has_no.errors(function()
+        highlight.highlight_hunk(
+          bufnr,
+          ns,
+          hunk,
+          default_opts({ highlights = { context = { enabled = true, lines = 25 } } })
+        )
+      end)
+
+      local extmarks = get_extmarks(bufnr)
+      assert.is_true(#extmarks > 0)
+      delete_buffer(bufnr)
+    end)
+
+    it('highlights treesitter injections', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+vim.cmd([[ echo 1 ]])',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+vim.cmd([[ echo 1 ]])' },
+      }
+
+      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+
+      local extmarks = get_extmarks(bufnr)
+      local has_vim_capture = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].hl_group and mark[4].hl_group:match('^@.*%.vim$') then
+          has_vim_capture = true
+          break
+        end
+      end
+      assert.is_true(has_vim_capture)
+      delete_buffer(bufnr)
+    end)
+
     it('includes captures from both base and injected languages', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -831,307 +1327,6 @@ describe('highlight', function()
       delete_buffer(bufnr)
     end)
 
-    it('classifies all combined diff prefix types for background', function()
-      local bufnr = create_buffer({
-        '@@@ -1,5 -1,5 +1,9 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-        '+ local greeting = "hi"',
-        '++=======',
-        '+   return 2',
-        '++>>>>>>> feature',
-        '  end',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = {
-          '  local M = {}',
-          '++<<<<<<< HEAD',
-          ' +  return 1',
-          '+ local greeting = "hi"',
-          '++=======',
-          '+   return 2',
-          '++>>>>>>> feature',
-          '  end',
-        },
-      }
-
-      highlight.highlight_hunk(
-        bufnr,
-        ns,
-        hunk,
-        default_opts({ highlights = { background = true } })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      local line_bgs = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].hl_eol then
-          line_bgs[mark[2]] = mark[4].hl_group
-        end
-      end
-      assert.is_nil(line_bgs[1])
-      assert.are.equal('DiffsAdd', line_bgs[2])
-      assert.are.equal('DiffsAdd', line_bgs[3])
-      assert.are.equal('DiffsAdd', line_bgs[4])
-      assert.are.equal('DiffsAdd', line_bgs[5])
-      assert.are.equal('DiffsAdd', line_bgs[6])
-      assert.are.equal('DiffsAdd', line_bgs[7])
-      assert.is_nil(line_bgs[8])
-      delete_buffer(bufnr)
-    end)
-
-    it('conceals full 2-char prefix for all combined diff line types', function()
-      local bufnr = create_buffer({
-        '@@@ -1,3 -1,3 +1,5 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-        '+ local x = 2',
-        '  end',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = {
-          '  local M = {}',
-          '++<<<<<<< HEAD',
-          ' +  return 1',
-          '+ local x = 2',
-          '  end',
-        },
-      }
-
-      highlight.highlight_hunk(bufnr, ns, hunk, default_opts({ hide_prefix = true }))
-
-      local extmarks = get_extmarks(bufnr)
-      local overlays = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text_pos == 'overlay' then
-          overlays[mark[2]] = mark[4].virt_text[1][1]
-        end
-      end
-      assert.are.equal(5, vim.tbl_count(overlays))
-      for _, text in pairs(overlays) do
-        assert.are.equal('  ', text)
-      end
-      delete_buffer(bufnr)
-    end)
-
-    it('places treesitter captures at col_offset 2 for combined diffs', function()
-      local bufnr = create_buffer({
-        '@@@ -1,2 -1,2 +1,2 @@@',
-        '  local x = 1',
-        ' +local y = 2',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = { '  local x = 1', ' +local y = 2' },
-      }
-
-      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
-
-      local extmarks = get_extmarks(bufnr)
-      local ts_marks = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].hl_group and mark[4].hl_group:match('^@.*%.lua$') then
-          table.insert(ts_marks, mark)
-        end
-      end
-      assert.is_true(#ts_marks > 0)
-      for _, mark in ipairs(ts_marks) do
-        assert.is_true(mark[3] >= 2)
-      end
-      delete_buffer(bufnr)
-    end)
-
-    it('applies DiffsClear starting at col 2 for combined diffs', function()
-      local bufnr = create_buffer({
-        '@@@ -1,1 -1,1 +1,2 @@@',
-        '  local x = 1',
-        ' +local y = 2',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = { '  local x = 1', ' +local y = 2' },
-      }
-
-      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
-
-      local extmarks = get_extmarks(bufnr)
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].hl_group == 'DiffsClear' then
-          assert.are.equal(2, mark[3])
-        end
-      end
-      delete_buffer(bufnr)
-    end)
-
-    it('skips intra-line diffing for combined diffs', function()
-      vim.api.nvim_set_hl(0, 'DiffsAddText', { bg = 0x00FF00 })
-      vim.api.nvim_set_hl(0, 'DiffsDeleteText', { bg = 0xFF0000 })
-
-      local bufnr = create_buffer({
-        '@@@ -1,2 -1,2 +1,3 @@@',
-        '  local x = 1',
-        ' +local y = 2',
-        '+ local y = 3',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = { '  local x = 1', ' +local y = 2', '+ local y = 3' },
-      }
-
-      highlight.highlight_hunk(
-        bufnr,
-        ns,
-        hunk,
-        default_opts({
-          highlights = { intra = { enabled = true, algorithm = 'default', max_lines = 500 } },
-        })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      for _, mark in ipairs(extmarks) do
-        local d = mark[4]
-        assert.is_not_equal('DiffsAddText', d and d.hl_group)
-        assert.is_not_equal('DiffsDeleteText', d and d.hl_group)
-      end
-      delete_buffer(bufnr)
-    end)
-
-    it('applies DiffsConflictMarker text on markers with DiffsAdd bg', function()
-      local bufnr = create_buffer({
-        '@@@ -1,5 -1,5 +1,9 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        '+ local x = 1',
-        '++||||||| base',
-        '++=======',
-        ' +local y = 2',
-        '++>>>>>>> feature',
-        '  return M',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        prefix_width = 2,
-        lines = {
-          '  local M = {}',
-          '++<<<<<<< HEAD',
-          '+ local x = 1',
-          '++||||||| base',
-          '++=======',
-          ' +local y = 2',
-          '++>>>>>>> feature',
-          '  return M',
-        },
-      }
-
-      highlight.highlight_hunk(
-        bufnr,
-        ns,
-        hunk,
-        default_opts({ highlights = { background = true, gutter = true } })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      local line_bgs = {}
-      local gutter_hls = {}
-      local marker_text = {}
-      for _, mark in ipairs(extmarks) do
-        local d = mark[4]
-        if d and d.hl_eol then
-          line_bgs[mark[2]] = d.hl_group
-        end
-        if d and d.number_hl_group then
-          gutter_hls[mark[2]] = d.number_hl_group
-        end
-        if d and d.hl_group == 'DiffsConflictMarker' then
-          marker_text[mark[2]] = true
-        end
-      end
-
-      assert.is_nil(line_bgs[1])
-      assert.are.equal('DiffsAdd', line_bgs[2])
-      assert.are.equal('DiffsAdd', line_bgs[3])
-      assert.are.equal('DiffsAdd', line_bgs[4])
-      assert.are.equal('DiffsAdd', line_bgs[5])
-      assert.are.equal('DiffsAdd', line_bgs[6])
-      assert.are.equal('DiffsAdd', line_bgs[7])
-      assert.is_nil(line_bgs[8])
-
-      assert.is_nil(gutter_hls[1])
-      assert.are.equal('DiffsAddNr', gutter_hls[2])
-      assert.are.equal('DiffsAddNr', gutter_hls[3])
-      assert.are.equal('DiffsAddNr', gutter_hls[4])
-      assert.are.equal('DiffsAddNr', gutter_hls[5])
-      assert.are.equal('DiffsAddNr', gutter_hls[6])
-      assert.are.equal('DiffsAddNr', gutter_hls[7])
-      assert.is_nil(gutter_hls[8])
-
-      assert.is_true(marker_text[2] ~= nil)
-      assert.is_nil(marker_text[3])
-      assert.is_true(marker_text[4] ~= nil)
-      assert.is_true(marker_text[5] ~= nil)
-      assert.is_nil(marker_text[6])
-      assert.is_true(marker_text[7] ~= nil)
-      delete_buffer(bufnr)
-    end)
-
-    it('does not apply DiffsConflictMarker in unified diffs', function()
-      local bufnr = create_buffer({
-        '@@ -1,1 +1,4 @@',
-        ' local M = {}',
-        '+<<<<<<< HEAD',
-        '+local x = 1',
-        '+=======',
-      })
-
-      local hunk = {
-        filename = 'test.lua',
-        lang = 'lua',
-        start_line = 1,
-        lines = { ' local M = {}', '+<<<<<<< HEAD', '+local x = 1', '+=======' },
-      }
-
-      highlight.highlight_hunk(
-        bufnr,
-        ns,
-        hunk,
-        default_opts({ highlights = { background = true } })
-      )
-
-      local extmarks = get_extmarks(bufnr)
-      for _, mark in ipairs(extmarks) do
-        local d = mark[4]
-        assert.is_not_equal('DiffsConflictMarker', d and d.hl_group)
-      end
-      delete_buffer(bufnr)
-    end)
-
     it('filters @spell and @nospell captures from injections', function()
       local bufnr = create_buffer({
         '@@ -1,1 +1,2 @@',
@@ -1191,7 +1386,6 @@ describe('highlight', function()
           context = { enabled = false, lines = 0 },
           treesitter = { enabled = true, max_lines = 500 },
           vim = { enabled = false, max_lines = 200 },
-          priorities = { clear = 198, syntax = 199, line_bg = 200, char_bg = 201 },
         },
       }
     end
@@ -1274,6 +1468,47 @@ describe('highlight', function()
       assert.are.equal(0, header_extmarks)
       delete_buffer(bufnr)
     end)
+
+    it('does not apply header highlights when treesitter disabled', 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 hunk = {
+        filename = 'parser.lua',
+        lang = 'lua',
+        start_line = 5,
+        lines = { ' local M = {}', '+local x = 1' },
+        header_start_line = 1,
+        header_lines = {
+          'diff --git a/parser.lua b/parser.lua',
+          'index 3e8afa0..018159c 100644',
+          '--- a/parser.lua',
+          '+++ b/parser.lua',
+        },
+      }
+
+      local opts = default_opts()
+      opts.highlights.treesitter.enabled = false
+
+      highlight.highlight_hunk(bufnr, ns, hunk, opts)
+
+      local extmarks = get_extmarks(bufnr)
+      local header_extmarks = 0
+      for _, mark in ipairs(extmarks) do
+        if mark[2] < 4 and mark[4] and mark[4].hl_group and mark[4].hl_group:match('^@') then
+          header_extmarks = header_extmarks + 1
+        end
+      end
+      assert.are.equal(0, header_extmarks)
+      delete_buffer(bufnr)
+    end)
   end)
 
   describe('extmark priority', function()
@@ -1308,11 +1543,40 @@ describe('highlight', function()
           context = { enabled = false, lines = 0 },
           treesitter = { enabled = true, max_lines = 500 },
           vim = { enabled = false, max_lines = 200 },
-          priorities = { clear = 198, syntax = 199, line_bg = 200, char_bg = 201 },
         },
       }
     end
 
+    it('uses priority 199 for code languages', function()
+      local bufnr = create_buffer({
+        '@@ -1,1 +1,2 @@',
+        ' local x = 1',
+        '+local y = 2',
+      })
+
+      local hunk = {
+        filename = 'test.lua',
+        lang = 'lua',
+        start_line = 1,
+        lines = { ' local x = 1', '+local y = 2' },
+      }
+
+      highlight.highlight_hunk(bufnr, ns, hunk, default_opts())
+
+      local extmarks = get_extmarks(bufnr)
+      local has_priority_199 = false
+      for _, mark in ipairs(extmarks) do
+        if mark[4] and mark[4].hl_group and mark[4].hl_group:match('^@.*%.lua$') then
+          if mark[4].priority == 199 then
+            has_priority_199 = true
+            break
+          end
+        end
+      end
+      assert.is_true(has_priority_199)
+      delete_buffer(bufnr)
+    end)
+
     it('uses treesitter priority for diff language', function()
       local bufnr = create_buffer({
         'diff --git a/test.lua b/test.lua',

spec/merge_spec.lua

@@ -1,815 +0,0 @@
-local helpers = require('spec.helpers')
-local merge = require('diffs.merge')
-
-local function default_config(overrides)
-  local cfg = {
-    enabled = true,
-    disable_diagnostics = false,
-    show_virtual_text = true,
-    show_actions = false,
-    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_diff_buffer(lines, working_path)
-  local bufnr = helpers.create_buffer(lines)
-  if working_path then
-    vim.api.nvim_buf_set_var(bufnr, 'diffs_working_path', working_path)
-  end
-  return bufnr
-end
-
-local function create_working_buffer(lines, name)
-  local bufnr = vim.api.nvim_create_buf(true, false)
-  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
-  if name then
-    vim.api.nvim_buf_set_name(bufnr, name)
-  end
-  return bufnr
-end
-
-describe('merge', function()
-  describe('parse_hunks', function()
-    it('parses a single hunk', function()
-      local bufnr = helpers.create_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,3 @@',
-        ' local M = {}',
-        '-local x = 1',
-        '+local x = 2',
-        ' return M',
-      })
-
-      local hunks = merge.parse_hunks(bufnr)
-      assert.are.equal(1, #hunks)
-      assert.are.equal(3, hunks[1].start_line)
-      assert.are.equal(7, hunks[1].end_line)
-      assert.are.same({ 'local x = 1' }, hunks[1].del_lines)
-      assert.are.same({ 'local x = 2' }, hunks[1].add_lines)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('parses multiple hunks', function()
-      local bufnr = helpers.create_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,3 @@',
-        ' local M = {}',
-        '-local x = 1',
-        '+local x = 2',
-        ' return M',
-        '@@ -10,3 +10,3 @@',
-        ' function M.foo()',
-        '-  return 1',
-        '+  return 2',
-        ' end',
-      })
-
-      local hunks = merge.parse_hunks(bufnr)
-      assert.are.equal(2, #hunks)
-      assert.are.equal(3, hunks[1].start_line)
-      assert.are.equal(8, hunks[2].start_line)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('parses add-only hunk', function()
-      local bufnr = helpers.create_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,2 +1,3 @@',
-        ' local M = {}',
-        '+local new = true',
-        ' return M',
-      })
-
-      local hunks = merge.parse_hunks(bufnr)
-      assert.are.equal(1, #hunks)
-      assert.are.same({}, hunks[1].del_lines)
-      assert.are.same({ 'local new = true' }, hunks[1].add_lines)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('parses delete-only hunk', function()
-      local bufnr = helpers.create_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,3 +1,2 @@',
-        ' local M = {}',
-        '-local old = false',
-        ' return M',
-      })
-
-      local hunks = merge.parse_hunks(bufnr)
-      assert.are.equal(1, #hunks)
-      assert.are.same({ 'local old = false' }, hunks[1].del_lines)
-      assert.are.same({}, hunks[1].add_lines)
-
-      helpers.delete_buffer(bufnr)
-    end)
-
-    it('returns empty for buffer with no hunks', function()
-      local bufnr = helpers.create_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-      })
-
-      local hunks = merge.parse_hunks(bufnr)
-      assert.are.equal(0, #hunks)
-
-      helpers.delete_buffer(bufnr)
-    end)
-  end)
-
-  describe('match_hunk_to_conflict', function()
-    it('matches hunk to conflict region', function()
-      local working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, '/tmp/diffs_test_match.lua')
-
-      local hunk = {
-        index = 1,
-        start_line = 3,
-        end_line = 7,
-        del_lines = { 'local x = 1' },
-        add_lines = { 'local x = 2' },
-      }
-
-      local region = merge.match_hunk_to_conflict(hunk, working_bufnr)
-      assert.is_not_nil(region)
-      assert.are.equal(0, region.marker_ours)
-
-      helpers.delete_buffer(working_bufnr)
-    end)
-
-    it('returns nil for auto-merged content', function()
-      local working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, '/tmp/diffs_test_auto.lua')
-
-      local hunk = {
-        index = 1,
-        start_line = 3,
-        end_line = 7,
-        del_lines = { 'local y = 3' },
-        add_lines = { 'local y = 4' },
-      }
-
-      local region = merge.match_hunk_to_conflict(hunk, working_bufnr)
-      assert.is_nil(region)
-
-      helpers.delete_buffer(working_bufnr)
-    end)
-
-    it('matches with empty ours section', function()
-      local working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, '/tmp/diffs_test_empty_ours.lua')
-
-      local hunk = {
-        index = 1,
-        start_line = 3,
-        end_line = 5,
-        del_lines = {},
-        add_lines = { 'local x = 2' },
-      }
-
-      local region = merge.match_hunk_to_conflict(hunk, working_bufnr)
-      assert.is_not_nil(region)
-
-      helpers.delete_buffer(working_bufnr)
-    end)
-
-    it('matches correct region among multiple conflicts', function()
-      local working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local a = 1',
-        '=======',
-        'local a = 2',
-        '>>>>>>> feature',
-        'middle',
-        '<<<<<<< HEAD',
-        'local b = 3',
-        '=======',
-        'local b = 4',
-        '>>>>>>> feature',
-      }, '/tmp/diffs_test_multi.lua')
-
-      local hunk = {
-        index = 2,
-        start_line = 8,
-        end_line = 12,
-        del_lines = { 'local b = 3' },
-        add_lines = { 'local b = 4' },
-      }
-
-      local region = merge.match_hunk_to_conflict(hunk, working_bufnr)
-      assert.is_not_nil(region)
-      assert.are.equal(6, region.marker_ours)
-
-      helpers.delete_buffer(working_bufnr)
-    end)
-
-    it('matches with diff3 format', function()
-      local working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '||||||| base',
-        'local x = 0',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, '/tmp/diffs_test_diff3.lua')
-
-      local hunk = {
-        index = 1,
-        start_line = 3,
-        end_line = 7,
-        del_lines = { 'local x = 1' },
-        add_lines = { 'local x = 2' },
-      }
-
-      local region = merge.match_hunk_to_conflict(hunk, working_bufnr)
-      assert.is_not_nil(region)
-      assert.are.equal(2, region.marker_base)
-
-      helpers.delete_buffer(working_bufnr)
-    end)
-  end)
-
-  describe('resolution', function()
-    local diff_bufnr, working_bufnr
-
-    local function setup_buffers()
-      local working_path = '/tmp/diffs_test_resolve.lua'
-      working_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      diff_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(diff_bufnr)
-    end
-
-    local function cleanup()
-      helpers.delete_buffer(diff_bufnr)
-      helpers.delete_buffer(working_bufnr)
-    end
-
-    it('resolve_ours keeps ours content in working file', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_ours(diff_bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(working_bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('local x = 1', lines[1])
-
-      cleanup()
-    end)
-
-    it('resolve_theirs keeps theirs content in working file', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_theirs(diff_bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(working_bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('local x = 2', lines[1])
-
-      cleanup()
-    end)
-
-    it('resolve_both keeps ours then theirs in working file', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_both(diff_bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(working_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])
-
-      cleanup()
-    end)
-
-    it('resolve_none removes entire block from working file', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_none(diff_bufnr, default_config())
-
-      local lines = vim.api.nvim_buf_get_lines(working_bufnr, 0, -1, false)
-      assert.are.equal(1, #lines)
-      assert.are.equal('', lines[1])
-
-      cleanup()
-    end)
-
-    it('tracks resolved hunks', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      assert.is_false(merge.is_resolved(diff_bufnr, 1))
-      merge.resolve_ours(diff_bufnr, default_config())
-      assert.is_true(merge.is_resolved(diff_bufnr, 1))
-
-      cleanup()
-    end)
-
-    it('adds virtual text for resolved hunks', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_ours(diff_bufnr, default_config())
-
-      local extmarks =
-        vim.api.nvim_buf_get_extmarks(diff_bufnr, merge.get_namespace(), 0, -1, { details = true })
-      local has_resolved_text = false
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          for _, chunk in ipairs(mark[4].virt_text) do
-            if chunk[1]:match('resolved') then
-              has_resolved_text = true
-            end
-          end
-        end
-      end
-      assert.is_true(has_resolved_text)
-
-      cleanup()
-    end)
-
-    it('notifies when hunk is already resolved', function()
-      setup_buffers()
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_ours(diff_bufnr, default_config())
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('already resolved') then
-          notified = true
-        end
-      end
-
-      merge.resolve_ours(diff_bufnr, default_config())
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      cleanup()
-    end)
-
-    it('notifies when hunk does not match a conflict', function()
-      local working_path = '/tmp/diffs_test_no_conflict.lua'
-      local w_bufnr = create_working_buffer({
-        'local y = 1',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('does not correspond') then
-          notified = true
-        end
-      end
-
-      merge.resolve_ours(d_bufnr, default_config())
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-  end)
-
-  describe('navigation', function()
-    it('goto_next jumps to next conflict hunk', function()
-      local working_path = '/tmp/diffs_test_nav.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local a = 1',
-        '=======',
-        'local a = 2',
-        '>>>>>>> feature',
-        'middle',
-        '<<<<<<< HEAD',
-        'local b = 3',
-        '=======',
-        'local b = 4',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local a = 1',
-        '+local a = 2',
-        '@@ -5,1 +5,1 @@',
-        '-local b = 3',
-        '+local b = 4',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      merge.goto_next(d_bufnr)
-      assert.are.equal(4, vim.api.nvim_win_get_cursor(0)[1])
-
-      merge.goto_next(d_bufnr)
-      assert.are.equal(7, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('goto_next wraps around', function()
-      local working_path = '/tmp/diffs_test_wrap.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 6, 0 })
-
-      merge.goto_next(d_bufnr)
-      assert.are.equal(4, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('goto_next notifies on wrap-around', function()
-      local working_path = '/tmp/diffs_test_wrap_notify.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 6, 0 })
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('wrapped to first hunk') then
-          notified = true
-        end
-      end
-
-      merge.goto_next(d_bufnr)
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('goto_prev jumps to previous conflict hunk', function()
-      local working_path = '/tmp/diffs_test_prev.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local a = 1',
-        '=======',
-        'local a = 2',
-        '>>>>>>> feature',
-        'middle',
-        '<<<<<<< HEAD',
-        'local b = 3',
-        '=======',
-        'local b = 4',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local a = 1',
-        '+local a = 2',
-        '@@ -5,1 +5,1 @@',
-        '-local b = 3',
-        '+local b = 4',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 9, 0 })
-
-      merge.goto_prev(d_bufnr)
-      assert.are.equal(7, vim.api.nvim_win_get_cursor(0)[1])
-
-      merge.goto_prev(d_bufnr)
-      assert.are.equal(4, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('goto_prev wraps around', function()
-      local working_path = '/tmp/diffs_test_prev_wrap.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      merge.goto_prev(d_bufnr)
-      assert.are.equal(4, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('goto_prev notifies on wrap-around', function()
-      local working_path = '/tmp/diffs_test_prev_wrap_notify.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-
-      local notified = false
-      local orig_notify = vim.notify
-      vim.notify = function(msg)
-        if msg:match('wrapped to last hunk') then
-          notified = true
-        end
-      end
-
-      merge.goto_prev(d_bufnr)
-      vim.notify = orig_notify
-
-      assert.is_true(notified)
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-
-    it('skips resolved hunks', function()
-      local working_path = '/tmp/diffs_test_skip_resolved.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local a = 1',
-        '=======',
-        'local a = 2',
-        '>>>>>>> feature',
-        'middle',
-        '<<<<<<< HEAD',
-        'local b = 3',
-        '=======',
-        'local b = 4',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local a = 1',
-        '+local a = 2',
-        '@@ -5,1 +5,1 @@',
-        '-local b = 3',
-        '+local b = 4',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      merge.resolve_ours(d_bufnr, default_config())
-
-      vim.api.nvim_win_set_cursor(0, { 1, 0 })
-      merge.goto_next(d_bufnr)
-      assert.are.equal(7, vim.api.nvim_win_get_cursor(0)[1])
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-  end)
-
-  describe('hunk hints', function()
-    it('adds keymap hints on hunk header lines', function()
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      })
-
-      merge.setup_keymaps(d_bufnr, default_config())
-
-      local extmarks =
-        vim.api.nvim_buf_get_extmarks(d_bufnr, merge.get_namespace(), 0, -1, { details = true })
-      local hint_marks = {}
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          local text = ''
-          for _, chunk in ipairs(mark[4].virt_text) do
-            text = text .. chunk[1]
-          end
-          table.insert(hint_marks, { line = mark[2], text = text })
-        end
-      end
-      assert.are.equal(1, #hint_marks)
-      assert.are.equal(3, hint_marks[1].line)
-      assert.is_truthy(hint_marks[1].text:find('doo'))
-      assert.is_truthy(hint_marks[1].text:find('dot'))
-
-      helpers.delete_buffer(d_bufnr)
-    end)
-  end)
-
-  describe('setup_keymaps', function()
-    it('clears resolved state on re-init', function()
-      local working_path = '/tmp/diffs_test_reinit.lua'
-      local w_bufnr = create_working_buffer({
-        '<<<<<<< HEAD',
-        'local x = 1',
-        '=======',
-        'local x = 2',
-        '>>>>>>> feature',
-      }, working_path)
-
-      local d_bufnr = create_diff_buffer({
-        'diff --git a/file.lua b/file.lua',
-        '--- a/file.lua',
-        '+++ b/file.lua',
-        '@@ -1,1 +1,1 @@',
-        '-local x = 1',
-        '+local x = 2',
-      }, working_path)
-      vim.api.nvim_set_current_buf(d_bufnr)
-      vim.api.nvim_win_set_cursor(0, { 5, 0 })
-
-      local cfg = default_config()
-      merge.resolve_ours(d_bufnr, cfg)
-      assert.is_true(merge.is_resolved(d_bufnr, 1))
-
-      local extmarks =
-        vim.api.nvim_buf_get_extmarks(d_bufnr, merge.get_namespace(), 0, -1, { details = true })
-      assert.is_true(#extmarks > 0)
-
-      merge.setup_keymaps(d_bufnr, cfg)
-
-      assert.is_false(merge.is_resolved(d_bufnr, 1))
-      extmarks =
-        vim.api.nvim_buf_get_extmarks(d_bufnr, merge.get_namespace(), 0, -1, { details = true })
-      local resolved_count = 0
-      for _, mark in ipairs(extmarks) do
-        if mark[4] and mark[4].virt_text then
-          for _, chunk in ipairs(mark[4].virt_text) do
-            if chunk[1]:match('resolved') then
-              resolved_count = resolved_count + 1
-            end
-          end
-        end
-      end
-      assert.are.equal(0, resolved_count)
-
-      helpers.delete_buffer(d_bufnr)
-      helpers.delete_buffer(w_bufnr)
-    end)
-  end)
-
-  describe('fugitive integration', function()
-    it('parse_file_line returns status for unmerged files', function()
-      local fugitive = require('diffs.fugitive')
-      local buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_lines(buf, 0, -1, false, {
-        'Unstaged (1)',
-        'U  conflict.lua',
-      })
-      local filename, section, is_header, old_filename, status = fugitive.get_file_at_line(buf, 2)
-      assert.are.equal('conflict.lua', filename)
-      assert.are.equal('unstaged', section)
-      assert.is_false(is_header)
-      assert.is_nil(old_filename)
-      assert.are.equal('U', status)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-
-    it('walkback from hunk line propagates status', function()
-      local fugitive = require('diffs.fugitive')
-      local buf = vim.api.nvim_create_buf(false, true)
-      vim.api.nvim_buf_set_lines(buf, 0, -1, false, {
-        'Unstaged (1)',
-        'U  conflict.lua',
-        '@@ -1,3 +1,4 @@',
-        ' local M = {}',
-        '+local new = true',
-      })
-      local _, _, _, _, status = fugitive.get_file_at_line(buf, 5)
-      assert.are.equal('U', status)
-      vim.api.nvim_buf_delete(buf, { force = true })
-    end)
-  end)
-end)

spec/parser_spec.lua

@@ -391,6 +391,37 @@ describe('parser', function()
       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',
@@ -409,6 +440,22 @@ describe('parser', function()
       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',
@@ -425,123 +472,6 @@ describe('parser', function()
       delete_buffer(bufnr)
     end)
 
-    it('recognizes U prefix for unmerged files', function()
-      local bufnr = create_buffer({
-        'U merge_me.lua',
-        '@@@ -1,3 -1,5 +1,9 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-        '++=======',
-        '+   return 2',
-        '++>>>>>>> feature',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('merge_me.lua', hunks[1].filename)
-      assert.are.equal('lua', hunks[1].ft)
-      delete_buffer(bufnr)
-    end)
-
-    it('sets prefix_width 2 from @@@ combined diff header', function()
-      local bufnr = create_buffer({
-        'U test.lua',
-        '@@@ -1,3 -1,5 +1,9 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(2, hunks[1].prefix_width)
-      delete_buffer(bufnr)
-    end)
-
-    it('sets prefix_width 1 for standard @@ unified diff', function()
-      local bufnr = create_buffer({
-        'M test.lua',
-        '@@ -1,2 +1,3 @@',
-        ' local x = 1',
-        '+local y = 2',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(1, hunks[1].prefix_width)
-      delete_buffer(bufnr)
-    end)
-
-    it('collects all combined diff line types as hunk content', function()
-      local bufnr = create_buffer({
-        'U test.lua',
-        '@@@ -1,3 -1,3 +1,5 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        ' +  return 1',
-        '+ local x = 2',
-        '  end',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(5, #hunks[1].lines)
-      assert.are.equal('  local M = {}', hunks[1].lines[1])
-      assert.are.equal('++<<<<<<< HEAD', hunks[1].lines[2])
-      assert.are.equal(' +  return 1', hunks[1].lines[3])
-      assert.are.equal('+ local x = 2', hunks[1].lines[4])
-      assert.are.equal('  end', hunks[1].lines[5])
-      delete_buffer(bufnr)
-    end)
-
-    it('extracts new range from combined diff header', function()
-      local bufnr = create_buffer({
-        'U test.lua',
-        '@@@ -1,3 -1,5 +1,9 @@@',
-        '  local M = {}',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal(1, hunks[1].file_new_start)
-      assert.are.equal(9, hunks[1].file_new_count)
-      assert.is_nil(hunks[1].file_old_start)
-      delete_buffer(bufnr)
-    end)
-
-    it('extracts header context from combined diff header', function()
-      local bufnr = create_buffer({
-        'U test.lua',
-        '@@@ -1,3 -1,5 +1,9 @@@ function M.greet()',
-        '  local M = {}',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(1, #hunks)
-      assert.are.equal('function M.greet()', hunks[1].header_context)
-      delete_buffer(bufnr)
-    end)
-
-    it('resets prefix_width when switching from combined to unified diff', function()
-      local bufnr = create_buffer({
-        'U merge.lua',
-        '@@@ -1,1 -1,1 +1,3 @@@',
-        '  local M = {}',
-        '++<<<<<<< HEAD',
-        'M other.lua',
-        '@@ -1,1 +1,2 @@',
-        ' local x = 1',
-        '+local y = 2',
-      })
-      local hunks = parser.parse_buffer(bufnr)
-
-      assert.are.equal(2, #hunks)
-      assert.are.equal(2, hunks[1].prefix_width)
-      assert.are.equal(1, hunks[2].prefix_width)
-      delete_buffer(bufnr)
-    end)
-
     it('stores repo_root on hunk when available', function()
       local bufnr = create_buffer({
         'M lua/test.lua',
@@ -557,5 +487,18 @@ describe('parser', function()
       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)