fix(highlight,parser,init): line_hl_group, clear_end, did_filetype, email-quoted diffs
Problem: line backgrounds used `hl_group + end_row` multirow extmarks vulnerable to adjacent `clear_namespace`. `clear_end` was off by one. `vim.filetype.match` returned nil for function-handled extensions (`.sh`, `.bash`, etc.) when `did_filetype() != 0`. Parser didn't handle email-quoted diff prefixes (`> `). Solution: use `line_hl_group` single-point extmarks. Fix `clear_end` to `hunk.start_line + #hunk.lines`. Override `vim.fn.did_filetype` via `rawset` during retry. Strip `> ` quote prefixes in parser and store `quote_width` per hunk. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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9 changed files with 552 additions and 52 deletions
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@ -13,6 +13,7 @@
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---@field file_new_start integer?
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---@field file_new_count integer?
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---@field prefix_width integer
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---@field quote_width integer
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---@field repo_root string?
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local M = {}
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@ -60,6 +61,13 @@ local function get_ft_from_filename(filename, repo_root)
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end
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local ft = vim.filetype.match({ filename = filename })
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if not ft and vim.fn.did_filetype() ~= 0 then
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dbg('retrying filetype match for %s (clearing did_filetype)', filename)
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local saved = rawget(vim.fn, 'did_filetype')
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rawset(vim.fn, 'did_filetype', function() return 0 end)
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ft = vim.filetype.match({ filename = filename })
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rawset(vim.fn, 'did_filetype', saved)
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end
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if ft then
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dbg('filetype from filename: %s', ft)
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return ft
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@ -125,6 +133,18 @@ end
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function M.parse_buffer(bufnr)
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local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
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local repo_root = get_repo_root(bufnr)
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local quote_prefix = nil
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local quote_width = 0
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for _, l in ipairs(lines) do
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local qp = l:match('^(>+ )diff ') or l:match('^(>+ )@@')
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if qp then
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quote_prefix = qp
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quote_width = #qp
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break
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end
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end
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---@type diffs.Hunk[]
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local hunks = {}
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@ -163,6 +183,7 @@ function M.parse_buffer(bufnr)
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---@type integer?
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local new_remaining = nil
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local is_unified_diff = false
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local current_quote_width = 0
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local function flush_hunk()
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if hunk_start and #hunk_lines > 0 then
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@ -175,6 +196,7 @@ function M.parse_buffer(bufnr)
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header_context_col = hunk_header_context_col,
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lines = hunk_lines,
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prefix_width = hunk_prefix_width,
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quote_width = current_quote_width,
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file_old_start = file_old_start,
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file_old_count = file_old_count,
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file_new_start = file_new_start,
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@ -200,18 +222,31 @@ function M.parse_buffer(bufnr)
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end
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for i, line in ipairs(lines) do
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local diff_git_file = line:match('^diff %-%-git a/.+ b/(.+)$')
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local neogit_file = line:match('^modified%s+(.+)$')
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or (not line:match('^new file mode') and line:match('^new file%s+(.+)$'))
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or (not line:match('^deleted file mode') and line:match('^deleted%s+(.+)$'))
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or line:match('^renamed%s+(.+)$')
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or line:match('^copied%s+(.+)$')
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local bare_file = not hunk_start and line:match('^([^%s]+%.[^%s]+)$')
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local filename = line:match('^[MADRCU%?!]%s+(.+)$') or diff_git_file or neogit_file or bare_file
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local logical = line
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if quote_prefix then
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if line:sub(1, quote_width) == quote_prefix then
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logical = line:sub(quote_width + 1)
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elseif line:match('^>+$') then
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logical = ''
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end
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end
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local diff_git_file = logical:match('^diff %-%-git a/.+ b/(.+)$')
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local neogit_file = logical:match('^modified%s+(.+)$')
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or (not logical:match('^new file mode') and logical:match('^new file%s+(.+)$'))
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or (not logical:match('^deleted file mode') and logical:match('^deleted%s+(.+)$'))
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or logical:match('^renamed%s+(.+)$')
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or logical:match('^copied%s+(.+)$')
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local bare_file = not hunk_start and logical:match('^([^%s]+%.[^%s]+)$')
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local filename = logical:match('^[MADRCU%?!]%s+(.+)$')
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or diff_git_file
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or neogit_file
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or bare_file
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if filename then
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is_unified_diff = diff_git_file ~= nil
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flush_hunk()
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current_filename = filename
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current_quote_width = (logical ~= line) and quote_width or 0
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local cache_key = (repo_root or '') .. '\0' .. filename
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local cached = ft_lang_cache[cache_key]
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if cached then
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@ -233,13 +268,13 @@ function M.parse_buffer(bufnr)
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hunk_prefix_width = 1
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header_start = i
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header_lines = {}
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elseif line:match('^@@+') then
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elseif logical:match('^@@+') then
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flush_hunk()
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hunk_start = i
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local at_prefix = line:match('^(@@+)')
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local at_prefix = logical:match('^(@@+)')
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hunk_prefix_width = #at_prefix - 1
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if #at_prefix == 2 then
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local hs, hc, hs2, hc2 = line:match('^@@ %-(%d+),?(%d*) %+(%d+),?(%d*) @@')
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local hs, hc, hs2, hc2 = logical:match('^@@ %-(%d+),?(%d*) %+(%d+),?(%d*) @@')
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if hs then
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file_old_start = tonumber(hs)
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file_old_count = tonumber(hc) or 1
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@ -249,24 +284,24 @@ function M.parse_buffer(bufnr)
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new_remaining = file_new_count
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end
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else
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local hs2, hc2 = line:match('%+(%d+),?(%d*) @@')
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local hs2, hc2 = logical:match('%+(%d+),?(%d*) @@')
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if hs2 then
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file_new_start = tonumber(hs2)
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file_new_count = tonumber(hc2) or 1
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end
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end
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local at_end, context = line:match('^(@@+.-@@+%s*)(.*)')
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local at_end, context = logical:match('^(@@+.-@@+%s*)(.*)')
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if context and context ~= '' then
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hunk_header_context = context
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hunk_header_context_col = #at_end
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hunk_header_context_col = #at_end + current_quote_width
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end
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if hunk_count then
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hunk_count = hunk_count + 1
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end
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elseif hunk_start then
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local prefix = line:sub(1, 1)
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local prefix = logical:sub(1, 1)
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if prefix == ' ' or prefix == '+' or prefix == '-' then
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table.insert(hunk_lines, line)
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table.insert(hunk_lines, logical)
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if old_remaining and (prefix == ' ' or prefix == '-') then
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old_remaining = old_remaining - 1
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end
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@ -274,7 +309,7 @@ function M.parse_buffer(bufnr)
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new_remaining = new_remaining - 1
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end
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elseif
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line == ''
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logical == ''
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and is_unified_diff
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and old_remaining
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and old_remaining > 0
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@ -285,11 +320,11 @@ function M.parse_buffer(bufnr)
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old_remaining = old_remaining - 1
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new_remaining = new_remaining - 1
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elseif
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line == ''
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or line:match('^[MADRC%?!]%s+')
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or line:match('^diff ')
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or line:match('^index ')
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or line:match('^Binary ')
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logical == ''
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or logical:match('^[MADRC%?!]%s+')
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or logical:match('^diff ')
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or logical:match('^index ')
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or logical:match('^Binary ')
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then
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flush_hunk()
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current_filename = nil
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@ -299,7 +334,7 @@ function M.parse_buffer(bufnr)
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end
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end
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if header_start and not hunk_start then
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table.insert(header_lines, line)
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table.insert(header_lines, logical)
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end
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end
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