chore: add treefmt formatting (nix fmt + pre-commit + CI check)#4
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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
Adds a treefmt-based formatting workflow to this repo’s Nix flake so contributors can run nix fmt, get a dev-shell-installed pre-commit formatter check, and have CI enforce formatting consistency.
Changes:
- Introduces
treefmt-nixintegration inflake.nix(addsnix fmtformatter +checks.formatting). - Adds formatter configuration files (
treefmt.nix,.tidyrc.json,.lua-format) and documents the workflow inAGENTS.md. - Runs formatting across existing PureScript sources/tests and updates CI + luacheck line-length settings.
Reviewed changes
Copilot reviewed 11 out of 13 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
treefmt.nix |
New treefmt configuration wiring nixfmt/dhall/purs-tidy/lua-format plus excludes. |
flake.nix |
Wires treefmt-nix into the flake, exposes formatter/check, and installs a pre-commit hook in the dev shell. |
.github/workflows/ci.yml |
Updates luacheck invocation and adds a format-check step. |
AGENTS.md |
Documents formatting and updated lint/format commands. |
.gitignore |
Ensures new dotfile formatter configs are not ignored. |
.tidyrc.json |
Adds purs-tidy formatting settings. |
.lua-format |
Adds LuaFormatter configuration for FFI formatting. |
flake.lock |
Locks the new treefmt-nix input. |
src/Data/Enum.purs |
Formatting-only changes. |
src/Data/Enum/Gen.purs |
Formatting-only changes. |
src/Data/Enum/Generic.purs |
Formatting-only changes. |
test/Test/Data/Enum.purs |
Formatting-only changes. |
test/Test/Data/Enum/Generic.purs |
Formatting-only changes. |
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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.