chore: add treefmt formatting (nix fmt + pre-commit + CI check)#6
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Wire treefmt via treefmt-nix: nixfmt, dhall format, purs-tidy (.tidyrc.json) and LuaFormatter for the FFI (.lua-format, kept over StyLua because it preserves the parentheses pslua's parser needs). `nix fmt` formats; the dev shell installs a content-based pre-commit hook and CI runs `nix fmt && git diff --exit-code` (content-based, since the in-place formatters bump mtime and would trip treefmt --fail-on-change). Lua lines budget 130 cols, matching the raised `luacheck --max-line-length`. The bulk of the diff is the first format pass.
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Pull request overview
This PR rolls out repository-wide formatting support using treefmt-nix, wiring it into the flake so nix fmt works locally, CI enforces formatting, and the dev shell installs a pre-commit hook to prevent unformatted commits.
Changes:
- Add
treefmt-nixintegration toflake.nix(formatter output +checks.formatting) and a dev-shell pre-commit hook. - Add formatter configs (
treefmt.nix,.tidyrc.json,.lua-format) and document usage inAGENTS.md. - Update CI to run a format check and apply the initial formatter pass to PureScript/Lua sources.
Reviewed changes
Copilot reviewed 8 out of 10 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
treefmt.nix |
Defines treefmt programs and custom formatters (purs-tidy, LuaFormatter) plus global excludes. |
flake.nix |
Adds treefmt-nix input, exposes formatter/checks.formatting, installs a pre-commit hook in shellHook. |
.github/workflows/ci.yml |
Adds nix fmt && git diff --exit-code format check step; updates luacheck line length. |
AGENTS.md |
Documents new format command and updated luacheck settings. |
.tidyrc.json |
Adds purs-tidy configuration. |
.lua-format |
Adds LuaFormatter configuration for FFI sources. |
.gitignore |
Ensures new dotfile configs are tracked. |
src/Test/Assert.purs |
Pure formatting changes from purs-tidy. |
src/Test/Assert.lua |
Pure formatting changes from LuaFormatter. |
flake.lock |
Locks the new treefmt-nix input. |
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Roll the ecosystem formatting setup (ADR 0007, piloted in purescript-lua/purescript-lua-effect#6) onto this fork.
Tooling. Copies
treefmt.nix/.tidyrc.json/.lua-formatand wires treefmt-nix into the flake:nix fmtformats,checks.formattingis exposed, the dev shell installs a content-based pre-commit hook, and CI gains a format-check step. The check is content-based (nix fmt && git diff --exit-code) rather thantreefmt --ci, since the in-place formatters bump mtime even when content is unchanged. LuaFormatter is kept over StyLua because it preserves the parentheses pslua's foreign-file parser requires;luacheck --max-line-lengthraised to 130 to match.Diff. The bulk is the first
nix fmtpass over*.pursand the*.luaFFI. Verified locally: build +luacheck --max-line-length 130green.