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
Rolls out standardized formatting for this fork using treefmt-nix, aligning local (nix fmt), pre-commit, and CI formatting checks with the broader purescript-lua ecosystem approach.
Changes:
- Add treefmt configuration and formatter configs for Nix, Dhall, PureScript (purs-tidy), and Lua FFI (LuaFormatter).
- Wire treefmt-nix into
flake.nix(flakeformatter,checks.formatting, devShell pre-commit hook) and add a CI format-check step. - Apply a first formatting pass over
*.purs,*.lua, andspago.dhall.
Reviewed changes
Copilot reviewed 10 out of 12 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
treefmt.nix |
Defines treefmt programs/formatters and global excludes for the repo. |
flake.nix |
Adds treefmt-nix input, exposes formatter and checks.formatting, and installs a pre-commit hook in shellHook. |
flake.lock |
Locks the new treefmt-nix flake input. |
.github/workflows/ci.yml |
Adds a formatting check step and updates luacheck max line length. |
AGENTS.md |
Documents formatting workflow and updated lint command/line budget. |
.tidyrc.json |
Configures purs-tidy formatting behavior. |
.lua-format |
Configures LuaFormatter for FFI formatting and line length strategy. |
.gitignore |
Ensures the new dotfiles (.tidyrc.json, .lua-format) are not ignored. |
spago.dhall |
Dhall formatting normalization (single-line dependency list). |
src/Data/Unfoldable.purs |
purs-tidy formatting changes. |
src/Data/Unfoldable1.purs |
purs-tidy formatting changes. |
src/Data/Unfoldable.lua |
LuaFormatter formatting change (control block compacting). |
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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.