fix(highlight): support combined diff format for unmerged files (#106)
## Problem Fugitive shows combined diffs (`@@@` headers, 2-character prefixes like `++`, ` +`, `+ `) for unmerged (`UU`) files. The parser and highlight pipeline assumed unified diff format (`@@`, 1-char prefix), causing: - Prefix concealment only hiding 1 of 2 prefix chars - Missing background colors on ` +` and `+ ` lines (first char is space → misclassified as context) - No treesitter highlights (extra prefix char poisoned code arrays) - `U` file header not recognized by parser (missing from filename pattern) ## Solution Detect prefix width from leading `@` count in hunk headers (`@@` → 1, `@@@` → 2). Propagate `prefix_width` through the pipeline: - **Parser**: new `prefix_width` field on `diffs.Hunk`, `U` added to filename pattern, combined diff range extraction - **Highlight**: prefix stripping, `col_offset`, concealment width, and line classification all use `prefix_width` - **Intra-line**: skipped for combined diffs (`prefix_width > 1`) since 2-char prefix semantics don't produce meaningful change groups
This commit is contained in:
Barrett Ruth
GitHub
parent
59fcf14817
commit
cc5a368838
4 changed files with 484 additions and 28 deletions
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@ -239,13 +239,14 @@ local function highlight_vim_syntax(
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pcall(vim.api.nvim_buf_delete, scratch, { force = true })
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local hunk_line_count = #hunk.lines
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local col_off = (hunk.prefix_width or 1) - 1
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local extmark_count = 0
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for _, span in ipairs(spans) do
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local adj = span.line - leading_offset
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if adj >= 1 and adj <= hunk_line_count then
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local buf_line = hunk.start_line + adj - 1
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start, {
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end_col = span.col_end,
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, span.col_start + col_off, {
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end_col = span.col_end + col_off,
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hl_group = span.hl_name,
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priority = priorities.syntax,
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})
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@ -265,6 +266,7 @@ end
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---@param opts diffs.HunkOpts
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function M.highlight_hunk(bufnr, ns, hunk, opts)
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local p = opts.highlights.priorities
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local pw = hunk.prefix_width or 1
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local use_ts = hunk.lang and opts.highlights.treesitter.enabled
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local use_vim = not use_ts and hunk.ft and opts.highlights.vim.enabled
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@ -296,14 +298,16 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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local old_map = {}
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for i, line in ipairs(hunk.lines) do
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local prefix = line:sub(1, 1)
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local stripped = line:sub(2)
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local prefix = line:sub(1, pw)
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local stripped = line:sub(pw + 1)
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local buf_line = hunk.start_line + i - 1
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local has_add = prefix:find('+', 1, true) ~= nil
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local has_del = prefix:find('-', 1, true) ~= nil
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if prefix == '+' then
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if has_add and not has_del then
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new_map[#new_code] = buf_line
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table.insert(new_code, stripped)
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elseif prefix == '-' then
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elseif has_del and not has_add then
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old_map[#old_code] = buf_line
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table.insert(old_code, stripped)
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else
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@ -314,9 +318,9 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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end
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extmark_count =
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highlight_treesitter(bufnr, ns, new_code, hunk.lang, new_map, 1, covered_lines, p)
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highlight_treesitter(bufnr, ns, new_code, hunk.lang, new_map, pw, covered_lines, p)
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extmark_count = extmark_count
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+ highlight_treesitter(bufnr, ns, old_code, hunk.lang, old_map, 1, covered_lines, p)
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+ highlight_treesitter(bufnr, ns, old_code, hunk.lang, old_map, pw, covered_lines, p)
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if hunk.header_context and hunk.header_context_col then
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local header_line = hunk.start_line - 1
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@ -344,7 +348,7 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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---@type string[]
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local code_lines = {}
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for _, line in ipairs(hunk.lines) do
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table.insert(code_lines, line:sub(2))
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table.insert(code_lines, line:sub(pw + 1))
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end
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extmark_count = highlight_vim_syntax(bufnr, ns, hunk, code_lines, covered_lines, 0, p)
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end
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@ -367,7 +371,7 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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---@type diffs.IntraChanges?
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local intra = nil
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local intra_cfg = opts.highlights.intra
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if intra_cfg and intra_cfg.enabled and #hunk.lines <= intra_cfg.max_lines then
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if intra_cfg and intra_cfg.enabled and pw == 1 and #hunk.lines <= intra_cfg.max_lines then
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dbg('computing intra for hunk %s:%d (%d lines)', hunk.filename, hunk.start_line, #hunk.lines)
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intra = diff.compute_intra_hunks(hunk.lines, intra_cfg.algorithm)
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if intra then
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@ -401,22 +405,32 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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for i, line in ipairs(hunk.lines) do
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local buf_line = hunk.start_line + i - 1
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local line_len = #line
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local prefix = line:sub(1, 1)
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local prefix = line:sub(1, pw)
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local has_add = prefix:find('+', 1, true) ~= nil
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local has_del = prefix:find('-', 1, true) ~= nil
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local is_diff_line = has_add or has_del
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local line_hl = is_diff_line and (has_add and 'DiffsAdd' or 'DiffsDelete') or nil
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local number_hl = is_diff_line and (has_add and 'DiffsAddNr' or 'DiffsDeleteNr') or nil
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local is_diff_line = prefix == '+' or prefix == '-'
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local line_hl = is_diff_line and (prefix == '+' and 'DiffsAdd' or 'DiffsDelete') or nil
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local number_hl = is_diff_line and (prefix == '+' and 'DiffsAddNr' or 'DiffsDeleteNr') or nil
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local is_marker = false
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if pw > 1 and line_hl and not prefix:find('[^+]') then
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local content = line:sub(pw + 1)
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is_marker = content:match('^<<<<<<<')
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or content:match('^=======')
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or content:match('^>>>>>>>')
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or content:match('^|||||||')
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end
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if opts.hide_prefix then
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local virt_hl = (opts.highlights.background and line_hl) or nil
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, {
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virt_text = { { ' ', virt_hl } },
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virt_text = { { string.rep(' ', pw), virt_hl } },
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virt_text_pos = 'overlay',
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})
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end
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if line_len > 1 and covered_lines[buf_line] then
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 1, {
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if line_len > pw and covered_lines[buf_line] then
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, pw, {
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end_col = line_len,
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hl_group = 'DiffsClear',
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priority = p.clear,
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@ -438,8 +452,16 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
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end
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end
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if is_marker and line_len > pw then
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, pw, {
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end_col = line_len,
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hl_group = 'DiffsConflictMarker',
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priority = p.char_bg,
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})
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end
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if char_spans_by_line[i] then
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local char_hl = prefix == '+' and 'DiffsAddText' or 'DiffsDeleteText'
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local char_hl = has_add and 'DiffsAddText' or 'DiffsDeleteText'
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for _, span in ipairs(char_spans_by_line[i]) do
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dbg(
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'char extmark: line=%d buf_line=%d col=%d..%d hl=%s text="%s"',
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