perf(highlighter): Cache decoration-provider hot paths#1148
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In large folded org-files, foldtext.on_line is a hot path: two vim.fn calls (foldclosed, col) run per visible line per redraw, even on cache hits. Move them into on_win, building a per-window map of fold boundaries and line lengths for the visible range. on_line becomes an O(1) lookup. nvim_buf_get_lines replaces per-line col() queries; foldclosedend lets the scan skip over folded contents.
Replace the changedtick check that dropped the entire foldtext cache on every keystroke with an nvim_buf_attach listener: on_bytes drops cache entries inside the edited range and shifts later entries by the row delta, on_reload clears the cache for full reloads. Unedited closed folds keep their cached hl_group and skip the treesitter lookup on subsequent redraws.
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I just pushed a change to master to hide leading stars via tree-sitter queries (5ea6251), so we can rebase and simplify this a bit more. |
The on_line hook ran a tree query per visible line per redraw, making leading-star highlighting a hot path while typing. Cache end_col per buffer line. Shift/drop entries on buffer edits via nvim_buf_attach (on_bytes/on_reload), and rebuild the changed ranges from on_changedtree once the parser has produced a new tree. on_line is now a plain table lookup. Mirrors the cache pattern already used by foldtext.
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Typing in folded org-files is slow because
nvim_set_decoration_provider'son_linedoes per-line work on every redraw.Two commits add caching to foldtext: move
vim.fn.foldclosedandvim.fn.colfromon_linetoon_win, and replace thechangedtickwholesale-drop with annvim_buf_attachlistener that keeps the cache consistent under edits.A third commit applies the same pattern to stars. Each buffer keeps a per-line cache of the
(stars)node's end_col;on_bytesshifts and drops entries to stay consistent with edits, andon_changedtreere-queries the changed ranges after a reparse. Edits inside a headline that don't touch the leading stars keep their cache entry, since the stars themselves don't change.I used the snacks profiler to identify the hot methods; it's not a controlled benchmark, but
foldtext.on_lineandstars.on_lineno longer show up near the top after these changes.