Use Nix flake for pre-commit hooks

.github/workflows/run-pre-commit.yaml

@@ -14,17 +14,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repository
-        uses: actions/checkout@v4
-      - name: Install Python
-        uses: actions/setup-python@v5
+        uses: actions/checkout@v4.2.2
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v16
+      - name: Cache Nix environment
+        uses: DeterminateSystems/magic-nix-cache-action@v8
+      - name: Use Nix dev shell for subsequent steps
+        uses: rrbutani/use-nix-shell-action@v1
         with:
-          python-version: "3.11"
-      - name: Install Roc
-        uses: hasnep/setup-roc@main
-        with:
-          roc-version: 0.0.0-alpha2-rolling
+          extraNixOptions: --accept-flake-config
       - name: Run Pre-commit
-        uses: pre-commit/action@v3.0.1
+        run: pre-commit run --all-files
         env:
           # Prevent this action failing when running on the main branch
           SKIP: no-commit-to-branch

.pre-commit-config.yaml

@@ -1,25 +1,44 @@
 repos:
   # General checks
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+  - repo: local
     hooks:
       - name: Prevent committing to main
         id: no-commit-to-branch
+        language: system
+        entry: no-commit-to-branch
         args: [--branch, main]
+        pass_filenames: false
       - name: Make sure files end with a newline character
         id: end-of-file-fixer
+        language: system
+        entry: end-of-file-fixer
+        types: [text]
       - name: Remove trailing whitespace
-        id: trailing-whitespace
+        id: trailing-whitespace-fixer
+        language: system
+        entry: trailing-whitespace-fixer
+        types: [text]
       - name: Check for files that would conflict on case-insensitive filesystem
         id: check-case-conflict
+        language: system
+        entry: check-case-conflict
       - name: Check for merge conflicts
         id: check-merge-conflict
+        language: system
+        entry: check-merge-conflict
       - name: Check executable files have a shebang
         id: check-executables-have-shebangs
+        language: system
+        entry: check-executables-have-shebangs
+        types: [executable]
       - name: Check scripts with a shebang are executable
         id: check-shebang-scripts-are-executable
+        language: system
+        entry: check-shebang-scripts-are-executable
       - name: Don't allow adding large files
         id: check-added-large-files
+        language: system
+        entry: check-added-large-files
 
   # Roc
   - repo: https://github.com/hasnep/pre-commit-roc
@@ -32,42 +51,39 @@ repos:
         id: format
 
   # YAML
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
-    hooks:
-      - name: Validate YAML
-        id: check-yaml
-  - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.7.1
+  - repo: local
     hooks:
       - name: Format YAML files
-        id: prettier
+        id: yaml-format
+        language: system
+        entry: prettier --write
         types: [yaml]
 
   # Markdown
-  - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.7.1
+  - repo: local
     hooks:
       - name: Format markdown files
-        id: prettier
+        id: markdown-format
+        language: system
+        entry: prettier --write
         types: [markdown]
 
   # GitHub Actions
-  - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.23.2
+  - repo: local
     hooks:
       - name: Validate GitHub Actions workflow files
-        id: check-github-workflows
+        id: github-workflows-check
+        language: system
+        entry: actionlint
+        types: [yaml]
+        files: \.github/workflows/.*\.ya?ml$
 
-  # Pre-commit
-  - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.23.2
+  # Nix
+  - repo: local
     hooks:
-      - name: Validate Pre-commit config
-        id: check-jsonschema
-        files: ^.*\.pre-commit-config.yaml$
-        args:
-          [
-            "--schemafile",
-            "https://json.schemastore.org/pre-commit-config.json",
-          ]
+      - name: Format Nix files
+        id: nix-format
+        language: system
+        entry: alejandra
+        args: [--quiet]
+        types: [nix]

flake.nix

@@ -10,13 +10,7 @@
     extra-trusted-substituters = "https://roc-lang.cachix.org";
   };
 
-  outputs = inputs @ {
-    self,
-    nixpkgs,
-    flake-parts,
-    roc,
-    ...
-  }:
+  outputs = inputs @ {flake-parts, ...}:
     flake-parts.lib.mkFlake {inherit inputs;} {
       systems = ["aarch64-darwin" "aarch64-linux" "x86_64-darwin" "x86_64-linux"];
       perSystem = {
@@ -28,10 +22,13 @@
           name = "roc-math";
           packages = [
             inputs'.roc.packages.cli
-            pkgs.just
-            pkgs.pre-commit
+            pkgs.actionlint
             pkgs.alejandra
             pkgs.fd
+            pkgs.just
+            pkgs.nodePackages.prettier
+            pkgs.pre-commit
+            pkgs.python312Packages.pre-commit-hooks
           ];
           enterShell = "pre-commit install --overwrite";
         };