Ruff is now an external formatter for Python next to the Ruff language server: Settings › Languages & Frameworks › Ruff has the executable path, a configuration directory (or file), the provider preference, enabled languages, run-on-save, and Reformat with Ruff. Formatting runs on the unsaved document through stdin (with Ruff's --range for selections, in 1-based code-point columns) and never writes the file first. The configuration directory is shared with Ruff LSP, which can then start without a root marker. Tools that can't format a language are rejected even when requested.
Co-authored-by: muutot <92625353+muutot@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Below an oxfmt configuration (.oxfmtrc.json/.jsonc, oxfmt.config.ts/.mts) Reformat Code runs oxfmt instead of Prettier, with the same external-formatter settings; oxfmt formats whole files, so a selection formats the file with a notice. oxlint --lsp serves JS/TS/React/Vue/Svelte files below an oxlint config. Both are managed npm tools; a missing oxfmt gets the same Install prompt and error handling as Prettier, and formatter messages are translated for either tool.
Co-authored-by: d0whc3r <1378986+d0whc3r@users.noreply.github.com>
Reformat Code only asked the language server for formatting, so files whose server has no formatting capability (Markdown with marksman, and others depending on the server) could not be formatted.
Languages can now declare an external formatter. Prettier is the first: a managed tool installed on demand, or the project's own node_modules/prettier, an explicit path, or PATH. It runs on the backend copy of the document with the file's path so Prettier resolves the project's config, overrides and ignore files, and its result is applied as one undoable edit. Language servers that format a file keep doing so unless Prettier is preferred in Settings › Languages › Prettier; formatting on save is opt-in. Parsers without range support format the whole file and say so.
Errors carry structured tool data, so a missing Prettier reuses the shared install prompt and Prettier diagnostics or timeouts show as non-sticky notifications.
Fixes#639
d0whc3r
l0ng-ai