chore: add treefmt formatting (nix fmt + pre-commit + CI check)#7
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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
Rolls out standardized formatting tooling (treefmt + nix fmt) across the repo, wiring it into the Nix flake, developer workflow, and CI—plus applying the initial formatter pass to PureScript and Lua sources.
Changes:
- Add treefmt configuration (
treefmt.nix) and formatter configs (.tidyrc.json,.lua-format) and expose treefmt via the flakeformatter/checks.formatting. - Add a dev-shell-installed pre-commit hook and a CI formatting check (
nix fmt && git diff --exit-code). - Apply formatter-driven whitespace/layout changes across
*.pursand Lua regression test code.
Reviewed changes
Copilot reviewed 8 out of 13 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
treefmt.nix |
Defines treefmt programs and custom formatters for PureScript (purs-tidy) and Lua (LuaFormatter). |
flake.nix |
Adds treefmt-nix input, exposes formatter/formatting check, and installs a pre-commit hook from the dev shell. |
flake.lock |
Locks the new treefmt-nix flake input. |
.github/workflows/ci.yml |
Adds --max-line-length 130 to luacheck and introduces a formatting check step. |
AGENTS.md |
Documents formatting commands and rationale/constraints (e.g., Lua parentheses requirement). |
.tidyrc.json |
Adds purs-tidy configuration used by nix fmt. |
.lua-format |
Updates LuaFormatter config and documents line-length rationale. |
.gitignore |
Ensures .tidyrc.json and .lua-format are not ignored. |
src/Data/Number.purs |
purs-tidy formatting changes (exports/imports/foreign import layout). |
src/Data/Number/Format.purs |
purs-tidy formatting changes. |
src/Data/Number/Approximate.purs |
purs-tidy formatting changes. |
test/Test/Main.purs |
purs-tidy formatting changes in tests. |
test/regression/format.lua |
LuaFormatter-driven indentation/layout change. |
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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.