Barrett Ruth
997bc49f8b
Line-level backgrounds (DiffsAdd/DiffsDelete) now get a second tier:
changed characters within modified lines receive an intense background
overlay (DiffsAddText/DiffsDeleteText at 70% alpha vs 40% for lines).
Treesitter foreground colors show through since the extmarks only set bg.
diff.lua extracts contiguous -/+ change groups from hunk lines and diffs
each group byte-by-byte using vim.diff(). An optional libvscodediff FFI
backend (lib.lua) auto-downloads the .so from codediff.nvim releases and
falls back to native if unavailable.
New config: highlights.intra.{enabled, algorithm, max_lines}. Gated by
max_lines (default 200) to avoid stalling on huge hunks. Priority 201
sits above treesitter (200) so the character bg always wins.
Closes #60
362 lines
9.8 KiB
Lua
362 lines
9.8 KiB
Lua
local M = {}
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local dbg = require('diffs.log').dbg
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local diff = require('diffs.diff')
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---@param bufnr integer
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---@param ns integer
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---@param hunk diffs.Hunk
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---@param col_offset integer
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---@param text string
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---@param lang string
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---@return integer
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local function highlight_text(bufnr, ns, hunk, col_offset, text, lang)
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local ok, parser_obj = pcall(vim.treesitter.get_string_parser, text, lang)
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if not ok or not parser_obj then
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return 0
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end
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local trees = parser_obj:parse()
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if not trees or #trees == 0 then
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return 0
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end
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local query = vim.treesitter.query.get(lang, 'highlights')
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if not query then
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return 0
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end
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local extmark_count = 0
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local header_line = hunk.start_line - 1
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for id, node, metadata in query:iter_captures(trees[1]:root(), text) do
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local capture_name = '@' .. query.captures[id] .. '.' .. lang
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local sr, sc, er, ec = node:range()
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local buf_sr = header_line + sr
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local buf_er = header_line + er
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local buf_sc = col_offset + sc
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local buf_ec = col_offset + ec
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local priority = lang == 'diff' and (tonumber(metadata.priority) or 100) or 200
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
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end_row = buf_er,
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end_col = buf_ec,
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hl_group = capture_name,
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priority = priority,
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})
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extmark_count = extmark_count + 1
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end
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return extmark_count
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end
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---@class diffs.HunkOpts
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---@field hide_prefix boolean
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---@field highlights diffs.Highlights
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---@param bufnr integer
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---@param ns integer
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---@param hunk diffs.Hunk
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---@param code_lines string[]
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---@param col_offset integer?
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---@return integer
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local function highlight_treesitter(bufnr, ns, hunk, code_lines, col_offset)
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local lang = hunk.lang
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if not lang then
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return 0
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end
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local code = table.concat(code_lines, '\n')
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if code == '' then
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return 0
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end
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local ok, parser_obj = pcall(vim.treesitter.get_string_parser, code, lang)
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if not ok or not parser_obj then
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dbg('failed to create parser for lang: %s', lang)
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return 0
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end
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local trees = parser_obj:parse()
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if not trees or #trees == 0 then
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dbg('parse returned no trees for lang: %s', lang)
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return 0
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end
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local query = vim.treesitter.query.get(lang, 'highlights')
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if not query then
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dbg('no highlights query for lang: %s', lang)
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return 0
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end
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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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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, header_line, hunk.header_context_col, {
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end_col = hunk.header_context_col + #hunk.header_context,
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hl_group = 'Normal',
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priority = 199,
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})
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local header_extmarks =
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highlight_text(bufnr, ns, hunk, hunk.header_context_col, hunk.header_context, lang)
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if header_extmarks > 0 then
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dbg('header %s:%d applied %d extmarks', hunk.filename, hunk.start_line, header_extmarks)
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end
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end
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col_offset = col_offset or 1
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local extmark_count = 0
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for id, node, metadata in query:iter_captures(trees[1]:root(), code) do
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local capture_name = '@' .. query.captures[id] .. '.' .. lang
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local sr, sc, er, ec = node:range()
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local buf_sr = hunk.start_line + sr
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local buf_er = hunk.start_line + er
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local buf_sc = sc + col_offset
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local buf_ec = ec + col_offset
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local priority = lang == 'diff' and (tonumber(metadata.priority) or 100) or 200
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
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end_row = buf_er,
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end_col = buf_ec,
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hl_group = capture_name,
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priority = priority,
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})
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extmark_count = extmark_count + 1
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end
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return extmark_count
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end
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---@alias diffs.SyntaxQueryFn fun(line: integer, col: integer): integer, string
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---@param query_fn diffs.SyntaxQueryFn
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---@param code_lines string[]
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---@return {line: integer, col_start: integer, col_end: integer, hl_name: string}[]
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function M.coalesce_syntax_spans(query_fn, code_lines)
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local spans = {}
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for i, line in ipairs(code_lines) do
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local col = 1
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local line_len = #line
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while col <= line_len do
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local syn_id, hl_name = query_fn(i, col)
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if syn_id == 0 then
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col = col + 1
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else
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local span_start = col
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col = col + 1
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while col <= line_len do
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local next_id, next_name = query_fn(i, col)
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if next_id == 0 or next_name ~= hl_name then
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break
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end
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col = col + 1
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end
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if hl_name ~= '' then
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table.insert(spans, {
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line = i,
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col_start = span_start,
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col_end = col,
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hl_name = hl_name,
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})
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end
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end
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end
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end
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return spans
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end
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---@param bufnr integer
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---@param ns integer
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---@param hunk diffs.Hunk
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---@param code_lines string[]
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---@return integer
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local function highlight_vim_syntax(bufnr, ns, hunk, code_lines)
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local ft = hunk.ft
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if not ft then
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return 0
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end
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if #code_lines == 0 then
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return 0
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end
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local scratch = vim.api.nvim_create_buf(false, true)
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vim.api.nvim_buf_set_lines(scratch, 0, -1, false, code_lines)
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vim.api.nvim_set_option_value('bufhidden', 'wipe', { buf = scratch })
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local spans = {}
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vim.api.nvim_buf_call(scratch, function()
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vim.cmd('setlocal syntax=' .. ft)
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vim.cmd('redraw')
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---@param line integer
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---@param col integer
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---@return integer, string
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local function query_fn(line, col)
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local syn_id = vim.fn.synID(line, col, 1)
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if syn_id == 0 then
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return 0, ''
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end
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return syn_id, vim.fn.synIDattr(vim.fn.synIDtrans(syn_id), 'name')
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end
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spans = M.coalesce_syntax_spans(query_fn, code_lines)
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end)
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vim.api.nvim_buf_delete(scratch, { force = true })
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local extmark_count = 0
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for _, span in ipairs(spans) do
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local buf_line = hunk.start_line + span.line - 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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hl_group = span.hl_name,
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priority = 200,
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})
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extmark_count = extmark_count + 1
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end
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return extmark_count
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end
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---@param bufnr integer
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---@param ns integer
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---@param hunk diffs.Hunk
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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 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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local max_lines = use_ts and opts.highlights.treesitter.max_lines or opts.highlights.vim.max_lines
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if (use_ts or use_vim) and #hunk.lines > max_lines then
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dbg(
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'skipping hunk %s:%d (%d lines > %d max)',
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hunk.filename,
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hunk.start_line,
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#hunk.lines,
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max_lines
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)
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use_ts = false
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use_vim = false
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end
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local apply_syntax = use_ts or use_vim
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---@type string[]
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local code_lines = {}
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if apply_syntax then
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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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end
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end
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local extmark_count = 0
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if use_ts then
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extmark_count = highlight_treesitter(bufnr, ns, hunk, code_lines)
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elseif use_vim then
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extmark_count = highlight_vim_syntax(bufnr, ns, hunk, code_lines)
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end
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if
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hunk.header_start_line
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and hunk.header_lines
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and #hunk.header_lines > 0
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and opts.highlights.treesitter.enabled
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then
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extmark_count = extmark_count
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+ highlight_treesitter(bufnr, ns, {
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filename = hunk.filename,
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start_line = hunk.header_start_line - 1,
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lang = 'diff',
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lines = hunk.header_lines,
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header_lines = {},
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}, hunk.header_lines, 0)
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end
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local syntax_applied = extmark_count > 0
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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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intra = diff.compute_intra_hunks(hunk.lines, intra_cfg.algorithm)
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end
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---@type table<integer, diffs.CharSpan[]>
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local char_spans_by_line = {}
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if intra then
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for _, span in ipairs(intra.add_spans) do
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if not char_spans_by_line[span.line] then
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char_spans_by_line[span.line] = {}
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end
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table.insert(char_spans_by_line[span.line], span)
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end
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for _, span in ipairs(intra.del_spans) do
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if not char_spans_by_line[span.line] then
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char_spans_by_line[span.line] = {}
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end
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table.insert(char_spans_by_line[span.line], span)
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end
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end
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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 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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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_pos = 'overlay',
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})
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end
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if opts.highlights.background and is_diff_line then
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local extmark_opts = {
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line_hl_group = line_hl,
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priority = 198,
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}
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if opts.highlights.gutter then
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extmark_opts.number_hl_group = number_hl
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end
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 0, extmark_opts)
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end
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if line_len > 1 and syntax_applied then
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pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_line, 1, {
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end_col = line_len,
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hl_group = 'Normal',
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priority = 199,
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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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for _, span in ipairs(char_spans_by_line[i]) do
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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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hl_group = char_hl,
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priority = 201,
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})
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extmark_count = extmark_count + 1
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end
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end
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end
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dbg('hunk %s:%d applied %d extmarks', hunk.filename, hunk.start_line, extmark_count)
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end
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return M
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