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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

[3.0.0] - 2026-03-21

Performance

  • Line-level diff now uses Neovim's built-in vim.diff() (C xdiff library) instead of the pure-Lua Myers O(ND) implementation, delivering a 5–6× speedup on large files
  • Async thread machinery removed (vim.uv.new_thread, _worker.lua, JSON encode/decode round-trip) — vim.diff is synchronous and fast enough for all file sizes

Internal

  • Deleted lua/inline-diff/_worker.lua
  • compute_hunks is now synchronous (callback signature preserved for API compatibility)
  • _myers_matched retained for word-level (sub-line) diffing

[2.3.0] - 2026-03-14

Fixed

  • Word-level diff no longer splits multi-byte UTF-8 characters (CJK, accented letters, emoji) across token boundaries. Previously each byte of a multi-byte character was treated as a separate token, which could produce nvim_buf_set_extmark calls with byte offsets landing mid-codepoint, causing garbled highlight rendering.

Tests

  • 74 tests (up from 69); added _tokenize unit tests and multi-byte word-diff coverage

[2.2.0] - 2026-03-14

Documentation

  • Improved README with clearer setup and usage instructions
  • Updated demo GIF

[2.1.0] - 2026-03-14

Performance

  • Myers O(ND) algorithm now used for word-level diff, replacing the O(m×n) LCS
  • Hunk cache: skip extmark clear+rebuild when hunks are unchanged between refreshes (common during typing)
  • Synchronous diff path for files under 500 total lines, avoiding thread serialization overhead
  • decode_lines in worker no longer allocates a copy of the full content string

Fixed

  • prev_hunks cache correctly invalidated when switching refs, preventing blank buffer after render.clear()

Tests

  • 69 tests (up from 60); added _hunks_equal unit tests and ref-switch invalidation coverage

[2.0.0] - 2026-03-13

Fixed

  • Windows: git show path spec now uses forward slashes; backslashes in relpath caused git to report "path exists on disk but not in HEAD"
  • Windows: git show output with CRLF line endings no longer leaves trailing \r on every old line, which caused all lines to compare unequal
  • Thread worker: if require("inline-diff._worker") fails in the background thread (e.g. due to package.path resolution differences), the diff now falls back to synchronous computation on the main thread instead of silently producing no output

Performance

  • Diff computation runs off the main thread via vim.uv.new_thread, keeping the UI responsive on large files

[1.0.0] - 2026-03-07

Added

  • [ref] argument on all commands and the Lua API — diff against any git ref per invocation without changing the default (HEAD~1, a branch, a SHA, …)
  • staged ref: diff against the git index (what you've git add-ed); falls back to HEAD automatically when the file has no staged content

Fixed

  • Auto-scroll now correctly reveals all bottom virtual lines when the last buffer line wraps to more than one visual row
  • Auto-scroll no longer crashes when topline == buf_line_count

Performance

  • Removed redundant O(m+n) line-copy in _diff_lines
  • LCS dp-table initialization reduced from O(m×n) to O(m+n) by only pre-filling boundary rows/cols
  • compute_hunks now delivers results synchronously, saving one event-loop round-trip per keystroke

Tests

  • Expanded test suite to 56 tests; added dedicated scroll_spec.lua

[0.1.0] - 2026-03-06

Added

  • Initial implementation: live inline diff against a git ref with word-level highlighting
  • InlineDiffEnable, InlineDiffDisable, InlineDiff (toggle) commands
  • setup(), enable(), disable(), toggle() Lua API
  • Highlight groups derived from colorscheme's DiffAdd/DiffDelete, recomputed on ColorScheme
  • Debounced live updates on TextChanged/TextChangedI
  • Auto-scroll to reveal virtual lines at buffer edges (top/bottom deletions)
  • Pure Lua LCS-based line diff — no git diff subprocess
  • Git repo root and HEAD ref content cached per buffer; invalidated on BufWritePost, BufReadPost, and FocusGained
  • CursorMoved scroll adjustment short-circuited when no edge virtual lines exist
  • Identifier-boundary word tokenization: vim.o.something → vim.o.{foobar} highlights only the changed part

Fixed

  • Word-level highlight colors, layering, and foreground contrast
  • Buffer reload via :e! now correctly refreshes the diff