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 standardized formatting workflow (treefmt-nix) to the flake so formatting is available via nix fmt, can be enforced in CI, and can be integrated into local development via a pre-commit hook.
Changes:
- Introduces
treefmt.nixplus formatter configs (.tidyrc.json,.lua-format) and wires treefmt-nix intoflake.nixoutputs (formatter+checks.formatting). - Updates CI to run a format check (
nix fmt && git diff --exit-code) and adjusts luacheck’s max line length to 130. - Applies Dhall formatting tweaks and updates contributor/dev documentation (
AGENTS.md) and ignore rules for new dotfiles.
Reviewed changes
Copilot reviewed 7 out of 10 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| treefmt.nix | Defines the treefmt configuration and formatter wiring for Nix/Dhall/PureScript/Lua. |
| flake.nix | Integrates treefmt-nix into the flake (formatter + check) and adds a dev-shell pre-commit hook installer. |
| flake.lock | Pins the new treefmt-nix input. |
| .github/workflows/ci.yml | Adds a CI format-check step and updates luacheck line-length settings. |
| .tidyrc.json | Adds purs-tidy configuration used by formatting. |
| .lua-format | Adds LuaFormatter configuration used by formatting. |
| .gitignore | Ensures the new dotfile configs are not ignored. |
| AGENTS.md | Documents formatting, linting, and related workflow commands. |
| spago.dhall | Applies Dhall formatting normalization. |
| packages.dhall | Removes trailing whitespace/newline as part of formatting. |
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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.