ekp/CHANGELOG.md

Changelog

All notable changes to emacs-kp are documented here. The format follows Keep a Changelog, and the project aims to follow Semantic Versioning.

[Unreleased]

Editor integration

• Saving an auto-justified buffer now writes the logical text to disk; soft line breaks, glue spaces and break hyphens are layout, not content, and no longer reach the file.
• isearch searches the logical text, so CJK phrases and hyphenated words are found across the justified layout.
• Copying/killing puts the logical text on the kill ring (via a buffer-local filter-buffer-substring-function).
• Justification no longer flips buffer-modified-p on an unmodified buffer — no stray lock files or auto-saves — and re-flow no longer fights undo.
• Text typed adjacent to synthesized glue/hyphens no longer inherits the marker properties (rear-nonsticky), so it is never mistaken for layout and deleted on the next re-flow.
• Switching major mode or turning the minor mode off restores the logical text cleanly, widening first so narrowing leaves no justified orphans.
• Paragraphs containing field/read-only text (comint prompts) are left verbatim.

New commands and options

• ekp-justify-buffer / ekp-unjustify-buffer.
• ekp-justify-region / ekp-unjustify-region act on the paragraph at point when no region is active (DWIM).
• ekp-org-setup / ekp-markdown-setup wire the verbatim-protection presets in one call; ekp-auto-justify-mode applies the matching one automatically in Org/Markdown buffers.
• fill-paragraph is remapped to ekp-refill-paragraph while the mode is on.
• User options are now defcustoms under the ekp / ekp-region groups.
• ekp-cjk-no-line-start-extra: Japanese line-start prohibition for small kana, the prolonged sound mark and iteration marks (JIS X 4051).
• ekp-auto-justify-tick-budget: time budget per background re-flow tick.

Typography

• First-line indent (ekp-first-line-indent) now runs on the fast 1D dynamic program and the C engine, instead of the heavy 2D path.
• Dictionary LEFTHYPHENMIN / RIGHTHYPHENMIN are honored (English now keeps ≥2 before and ≥3 after a break, per its dictionary).

Performance

• Session-global box-width cache eliminates cross-paragraph duplicate measurement (≈40% of string-pixel-width calls on the Chinese sample); byte-compiled justify of that sample dropped ~40%.
• Cache keys ignore volatile fontified bookkeeping, restoring the paragraph-cache hit rate in font-locked buffers.
• Large-buffer re-flow: huge edits chunk in the background, scrolled regions get priority, background ticks honor a time budget.

Fixed

• The DP cache no longer returns a stale layout after ekp-looseness changes (results are keyed by looseness).
• Changing a style variable (ekp-alignment, …) invalidates the same-string fast path.
• Missing dictionaries/ directory only disables hyphenation instead of breaking (require 'ekp).

C module (1.4 → 1.5)

• Breaking: the unused experimental C tokenization path (ekp-c-break-lines, ekp-c-hyphenate, ekp-c-load-hyphenator, ekp-c-set-spacing, and the ekp_paragraph.c / ekp_hyphen.c sources) is removed. It carried a heap overflow reachable from Lisp. Rebuild with make -C ekp_c clean all.
• ekp-c-break-with-arrays gains a 15th argument, FIRST-LINE-WIDTH, supporting first-line indent in C.
• Thread pool sized to the machine's cores, created lazily; a full queue blocks instead of dropping tasks.
• Allocation failures and bad arguments fail the call cleanly (Elisp fallback) instead of silently producing a different layout; extracted integers are clamped to int32.

Packaging

• Added COPYING (GPL-3.0-or-later) and license headers to all sources; real author/maintainer metadata.
• Autoload cookies on all interactive commands.
• Removed internal working files and an unused demo GIF from the repo.

Historical

Earlier work (the core KP overhaul and the P1/P2 typography wave — optimal line breaking, CJK kinsoku, hyphenation, pixel-exact justification, alignment modes, hanging punctuation, parshape, no-break atoms, verbatim protection, the C module) predates this changelog; see the git history.