Add offline live spell checking (Hunspell via spellbook)

Spelling is now checked live as you type, fully offline, using the
pure-Rust `spellbook` crate to read Hunspell .aff/.dic dictionaries (no C
libhunspell — the binary stays self-contained; ldd unchanged).

- Canadian (en-CA, default) and British (en-GB) English dictionaries are
  compiled in; more languages are auto-discovered from system Hunspell
  folders and ~/.config/md-manuscript/dictionaries/. A "Spelling" row in
  the top bar toggles live checking and picks the dictionary.
- Misspellings are underlined in red; right-clicking a word opens a menu
  of suggested corrections. A results-panel and one-click fixes work too.
- Checks run on a background thread, debounced ~400ms after the last edit.
  Prose is extracted with pulldown-cmark so code spans, code blocks and
  link targets are skipped; ALL-CAPS initialisms are ignored.
- LanguageTool still layers on top: when its results are fresh they own
  the underlines (spelling + grammar); once you edit, the offline checker
  resumes. The editor underlines, issues panel and fix-apply logic are
  now shared between the two sources.

Bundled dictionaries are SCOWL-derived under a permissive license (kept
in dictionaries/<lang>/license). Adds spell-check unit tests (tokenizer,
code-block skipping, offset mapping, en-CA/en-GB spelling); 40 tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N9kRuP7JvXoUGdNNeg5ZSs
This commit is contained in:
landon
2026-08-14 06:25:08 -05:00
parent 691d1a0515
commit 19dddf30c7
14 changed files with 101168 additions and 69 deletions
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SET UTF-8
TRY esianrtolcdugmphbyfvkwzESIANRTOLCDUGMPHBYFVKWZ'
ICONV 1
ICONV '
NOSUGGEST !
# ordinal numbers
COMPOUNDMIN 1
# only in compounds: 1th, 2th, 3th
ONLYINCOMPOUND c
# compound rules:
# 1. [0-9]*1[0-9]th (10th, 11th, 12th, 56714th, etc.)
# 2. [0-9]*[02-9](1st|2nd|3rd|[4-9]th) (21st, 22nd, 123rd, 1234th, etc.)
COMPOUNDRULE 2
COMPOUNDRULE n*1t
COMPOUNDRULE n*mp
WORDCHARS 0123456789
PFX A Y 1
PFX A 0 re .
PFX I Y 1
PFX I 0 in .
PFX U Y 1
PFX U 0 un .
PFX C Y 1
PFX C 0 de .
PFX E Y 1
PFX E 0 dis .
PFX F Y 1
PFX F 0 con .
PFX K Y 1
PFX K 0 pro .
SFX V N 2
SFX V e ive e
SFX V 0 ive [^e]
SFX N Y 3
SFX N e ion e
SFX N y ication y
SFX N 0 en [^ey]
SFX X Y 3
SFX X e ions e
SFX X y ications y
SFX X 0 ens [^ey]
SFX H N 2
SFX H y ieth y
SFX H 0 th [^y]
SFX Y Y 1
SFX Y 0 ly .
SFX G Y 2
SFX G e ing e
SFX G 0 ing [^e]
SFX J Y 2
SFX J e ings e
SFX J 0 ings [^e]
SFX D Y 4
SFX D 0 d e
SFX D y ied [^aeiou]y
SFX D 0 ed [^ey]
SFX D 0 ed [aeiou]y
SFX T N 4
SFX T 0 st e
SFX T y iest [^aeiou]y
SFX T 0 est [aeiou]y
SFX T 0 est [^ey]
SFX R Y 4
SFX R 0 r e
SFX R y ier [^aeiou]y
SFX R 0 er [aeiou]y
SFX R 0 er [^ey]
SFX Z Y 4
SFX Z 0 rs e
SFX Z y iers [^aeiou]y
SFX Z 0 ers [aeiou]y
SFX Z 0 ers [^ey]
SFX S Y 4
SFX S y ies [^aeiou]y
SFX S 0 s [aeiou]y
SFX S 0 es [sxzh]
SFX S 0 s [^sxzhy]
SFX P Y 3
SFX P y iness [^aeiou]y
SFX P 0 ness [aeiou]y
SFX P 0 ness [^y]
SFX M Y 1
SFX M 0 's .
SFX B Y 3
SFX B 0 able [^aeiou]
SFX B 0 able ee
SFX B e able [^aeiou]e
SFX L Y 1
SFX L 0 ment .
REP 90
REP a ei
REP ei a
REP a ey
REP ey a
REP ai ie
REP ie ai
REP alot a_lot
REP are air
REP are ear
REP are eir
REP air are
REP air ere
REP ere air
REP ere ear
REP ere eir
REP ear are
REP ear air
REP ear ere
REP eir are
REP eir ere
REP ch te
REP te ch
REP ch ti
REP ti ch
REP ch tu
REP tu ch
REP ch s
REP s ch
REP ch k
REP k ch
REP f ph
REP ph f
REP gh f
REP f gh
REP i igh
REP igh i
REP i uy
REP uy i
REP i ee
REP ee i
REP j di
REP di j
REP j gg
REP gg j
REP j ge
REP ge j
REP s ti
REP ti s
REP s ci
REP ci s
REP k cc
REP cc k
REP k qu
REP qu k
REP kw qu
REP o eau
REP eau o
REP o ew
REP ew o
REP oo ew
REP ew oo
REP ew ui
REP ui ew
REP oo ui
REP ui oo
REP ew u
REP u ew
REP oo u
REP u oo
REP u oe
REP oe u
REP u ieu
REP ieu u
REP ue ew
REP ew ue
REP uff ough
REP oo ieu
REP ieu oo
REP ier ear
REP ear ier
REP ear air
REP air ear
REP w qu
REP qu w
REP z ss
REP ss z
REP shun tion
REP shun sion
REP shun cion
REP size cise