From 9fd65569ee17ac7568445c6315bef02023946adb Mon Sep 17 00:00:00 2001
From: Matthew Davidson <matthew@modulolotus.net>
Date: Fri, 3 May 2024 21:35:09 +0700
Subject: [PATCH] ci: Add Conventional Commits linter for CI

---
 .github/workflows/commit-linter.yaml | 38 ++++++++++++++++++++++++++++
 commitlint.config.mjs                |  6 +++++
 2 files changed, 44 insertions(+)
 create mode 100644 .github/workflows/commit-linter.yaml
 create mode 100644 commitlint.config.mjs

diff --git a/.github/workflows/commit-linter.yaml b/.github/workflows/commit-linter.yaml
new file mode 100644
index 0000000..9383f4d
--- /dev/null
+++ b/.github/workflows/commit-linter.yaml
@@ -0,0 +1,38 @@
+name: commit-linter
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  commit-lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: cachix/install-nix-action@v25
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: npm install
+        run: nix develop --command npm install --include=dev
+
+      - name: Print versions
+        run: |
+          git --version
+          node --version
+          npm --version
+          npx commitlint --version
+
+      - name: Validate current commit (last commit) with commitlint
+        if: github.event_name == 'push'
+        run: nix develop --command npx commitlint --last --verbose
+
+      - name: Validate PR commits with commitlint
+        if: github.event_name == 'pull_request'
+        run: nix develop --command npx commitlint --from ${{ github.event.pull_request.head.sha }}~${{ github.event.pull_request.commits }} --to ${{ github.event.pull_request.head.sha }} --verbose
diff --git a/commitlint.config.mjs b/commitlint.config.mjs
new file mode 100644
index 0000000..0f272b7
--- /dev/null
+++ b/commitlint.config.mjs
@@ -0,0 +1,6 @@
+export default { 
+    extends: ['@commitlint/config-conventional'],
+    rules: {
+        'subject-case': [2, 'always', 'sentence-case'] // override default
+    }
+};