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Claude
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The spell-checked drop-ins take onImeAction in place of keyboardActions: the keyboard's action key on phones, Enter in a single-line field on desktop (through BasicTextField's onKeyboardAction, now passed by ThinPaddingTextField and OutlinedThinPaddingTextField). On desktop the caller's copy of the text trails the field by a frame, so the action first hands the caller the field's latest text; Enter right after a keystroke sends all of it. The drawer status field uses it, with its send logic shared by Enter and the send button. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UkkpMm81Mcyazn25TzBWwh
105 lines
6.4 KiB
Markdown
105 lines
6.4 KiB
Markdown
# Spell checking in the desktop composers
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Status: built. Hunspell path tested headless on Linux; the macOS and Windows engines compile but
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have not run on those systems yet (see "Testing by hand").
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## What the user gets
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Misspelled words in the composers (posts, replies, DMs, chats, long-form, classifieds) and in the
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prose fields across the app (bios, descriptions, captions, notes, reasons, titles) get a wavy
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underline. Right-clicking one lists suggestions first, then "Add to dictionary", then the usual
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Cut / Copy / Paste / Select all. Settings › Compose › Spell checking picks the engine:
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| Choice | Engine |
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|---|---|
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| Automatic (default) | macOS `NSSpellChecker` / Windows `ISpellChecker` when it loads and passes a self-test; the bundled Hunspell en_US otherwise (always on Linux) |
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| Built-in | Bundled Hunspell en_US on every OS |
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| Off | Nothing |
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Android and iOS show no setting: the keyboard already checks spelling there (`AppPlatform.spellCheck`
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is null).
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## Why both engines, and why the system one is not always better
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| | System (macOS, Windows) | Bundled Hunspell |
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|---|---|---|
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| Languages | Whatever the user installed; macOS detects per word | en_US only, for now |
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| Learned words | Shared with every app (we do not write to it) | — |
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| Linux | none | yes |
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| Testable in CI / headless | no | yes |
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| Failure mode | JNA into native code: a wrong call crashes the JVM | plain Java |
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| Same results everywhere | no | yes |
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So "Automatic" prefers the system checker, and "Built-in" exists for people who want predictable
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results or hit a system-checker problem.
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## Pieces
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- `commons/…/service/spellcheck/` (headless): `SpellChecker` (an engine), `SpellCheckTokenizer`
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(skips links, `nostr:`/bech32, hashtags, `@mentions`, `:shortcodes:`, e-mail, Lightning/Cashu,
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code, words with digits, acronyms, camelCase/snake_case), `NostrVocabulary`, `SpellCheckService`
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(verdict + suggestion caches, the user's dictionary, one dispatcher for every engine call).
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- `commonsUI/…/ui/spellcheck/`: `SpellCheckFieldState` (re-checks after a 250 ms pause, carries
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underlines across edits, hides the word under the cursor), the wavy underline, right-click
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tracking, and `SpellCheckContextMenu` (desktop actual swaps `LocalTextContextMenu` so suggestions
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come first; Compose's `ContextMenuDataProvider` can only append after Select all, and
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`appendTextContextMenuComponents` needs `ComposeFoundationFlags.isNewContextMenuEnabled`, which is
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off on desktop and would change every text menu in the app).
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- `VisualOffsetMapping`: `UrlUserTagOutputTransformation` draws `nostr:npub1…` as `@Name`, so the
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checker (which reads the stored text) maps its ranges to the drawn text through the same
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replacement list.
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- `ThinPaddingTextField` / `OutlinedThinPaddingTextField` take `spellCheck = true` (the composers).
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- `SpellCheckedOutlinedTextField` / `SpellCheckedTextField` (`commonsUI/…/ui/components/SpellCheckedTextFields.kt`)
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are drop-ins for Material's `OutlinedTextField` / `TextField` on prose fields, for `String`,
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`TextFieldValue` and `TextFieldState` callers. Without a checker (Android, iOS) they are
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Material's own field; on desktop they mirror the caller's value into a `TextFieldState` (echoes of
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the field's own recent reports are ignored, anything else replaces the text). Instead of
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`keyboardActions` they take `onImeAction` (the keyboard's action key on phones, Enter in a
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single-line field on desktop), which runs after the caller has been handed the field's latest
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text. A length cap goes in `maxLength`, not in `onValueChange`.
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- Which fields: ~90 prose fields (descriptions, bios, captions, alt text, notes, comments, reasons,
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summaries, titles, poll options, chat composers, the post signature, the drawer status, Buzz
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prompts). Left out on purpose: search, URLs, keys, handles/NIP-05, amounts, names of
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people/lists/groups, geocache mission answers, and the quoted highlight passage.
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- `desktopApp/…/spellcheck/`: `HunspellSpellChecker` (Lucene `lucene-analysis-common` 10.5.1,
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Apache-2.0; dictionary from `dictionary-en` 4.0.0 = SCOWL 2020.12.07, licence in
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`resources/spellcheck/en_US-LICENSE.txt`), `MacSpellChecker`, `WindowsSpellChecker`,
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`DesktopSpellCheck` (engine choice, crash marker, `spelling-dictionary.txt`).
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Measured (en_US, JDK 21, this container): load ~0.4 s (~30 MB of short-lived garbage, ~1–2 MB
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kept; it loads under `-Xmx8m`), `spell()` ~2 µs/word,
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`suggest()` 20–190 ms (Lucene caps it at 250 ms). Nothing loads until a composer first opens.
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## Native safety
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- `MacSpellChecker` runs every call on the AppKit main thread (`dispatch_sync_f` on the main queue)
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from the spell-check thread. The main thread never waits on that thread, and the AWT event thread
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never calls an engine directly (suggestions are fetched in a coroutine and fill the open menu),
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so no wait cycle exists.
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- `WindowsSpellChecker` is created and used only on the spell-check thread, which joins the MTA.
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Vtable slots come from `spellcheck.idl` (mingw-w64): factory `IsSupported`=4,
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`CreateSpellChecker`=5; checker `Check`=4, `Suggest`=5; enumerators `Next`=3.
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- `DesktopSpellCheck` writes `spellcheck-native-probe` (the app version) before the first native
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call and deletes it after the self-test. If the file survives (the probe crashed the JVM), that
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app version never tries the system checker again and uses Hunspell.
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## Testing by hand (macOS and Windows)
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1. Run the desktop app, open a new post, type `I definately recieve zaps on Nostr. Teh end.`
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2. Expect underlines under definately, recieve, Teh only. The log line
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`[DesktopSpellCheck] Spell checking with macOS (AUTOMATIC)` / `Windows (en-US)` names the engine;
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`Hunspell (en_US)` there means the system checker failed — the warning above it says why.
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3. Right-click `recieve`: suggestions first, then Add to dictionary, then Cut/Copy/Paste/Select all.
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Pick one; it replaces the word.
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4. Settings › Compose › Spell checking › Built-in: the log switches to Hunspell; Off removes the
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underlines.
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5. If the app crashed during step 1, relaunch: it should come up on Hunspell and log
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"crashed this version of the app before".
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## Next
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- More bundled dictionaries (licences vary per language; check each).
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- An LLM "Improve" action for desktop: `AccountViewModelHost.createWritingAssistant()` already
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drives the Android on-device assistant (`WritingAssistant`, tones incl. `CORRECT`); a desktop
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host could back it with a local model server.
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