chore: add treefmt formatting (nix fmt + pre-commit + CI check)#2
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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 introduces a standardized formatting workflow for the repo by wiring treefmt-nix into the flake (so nix fmt becomes the canonical formatter), adding a content-based formatting check for CI, and documenting the workflow. It also includes a first-pass reformat of existing PureScript and Lua FFI sources to match the configured formatters.
Changes:
- Add
treefmt-nixintegration to the flake (formatter,checks.formatting) and install a pre-commit hook from the dev shell. - Add formatter configuration for Nix/Dhall/PureScript/Lua via
treefmt.nix,.tidyrc.json, and.lua-format. - Add CI format-check step and update luacheck line-length budget; apply formatting across touched
*.purs/ FFI*.lua.
Reviewed changes
Copilot reviewed 9 out of 11 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
treefmt.nix |
Adds treefmt-nix module config for nixfmt/dhall/purs-tidy/lua-format and global excludes. |
flake.nix |
Wires treefmt-nix into formatter/checks.formatting and installs a pre-commit hook via shellHook. |
flake.lock |
Pins the new treefmt-nix input. |
AGENTS.md |
Documents updated lint/format commands and explains formatting approach. |
.tidyrc.json |
Configures purs-tidy formatting behavior. |
.lua-format |
Configures LuaFormatter rules and line-length budget assumptions. |
.gitignore |
Ensures new dotfile configs are not ignored. |
.github/workflows/ci.yml |
Adds nix fmt && git diff --exit-code format check and updates luacheck max line length. |
src/Control/Monad/ST/Uncurried.purs |
Formatting-only changes from purs-tidy. |
src/Control/Monad/ST/Uncurried.lua |
Formatting-only changes from LuaFormatter. |
src/Control/Monad/ST/Internal.purs |
Formatting-only changes (layout/type signature wrapping). |
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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 + regression test.