ci: add commit message check

.github/workflows/commit-messages-check.yml

@@ -0,0 +1,12 @@
+name: "[Check]: Commit messages"
+
+on: [pull_request]
+
+jobs:
+  commit-message-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Check commit messages
+        run: ./scripts/check-commit-messages.sh

COMMITS.md

@@ -1,6 +1,6 @@
 # Commits
 
-Using [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) is strongly recommended and might be enforced in future.
+Using [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) is enforced by a CI check.
 
 ### Examples
 
@@ -12,7 +12,7 @@ feat(lang): added polish language
 
 ### Git hook
 
-Use this git hook to auto-check your commit messages. Save the following snippet into `.git/hooks/commit-msg`
+Use this git hook to auto-check your commit messages. Save the following snippet into `.git/hooks/commit-msg`. This way, the check will run locally and can avoid some unnecessary CI runs.
 
 ```bash
 #!/bin/sh
@@ -23,7 +23,7 @@ if echo "$commit_msg" | grep -qE "^(Revert|fixup! )"; then
   exit 0
 fi
 
-if ! grep -qE "^(build|ci|docs|feat|fix|perf|refactor|style|test|chore|revert)(\([a-z\-]+\))?: " "$1" ; then
+if ! grep -qE "^(build|ci|docs|feat|fix|perf|refactor|style|test|chore|revert)(\([a-z, -]+\))?: " "$1" ; then
   echo "Conventional Commits validation failed"
   exit 1
 fi

README.md

@@ -51,7 +51,7 @@ Run a dev build:
 
 Inspired by [GitLab Contributing Guide](https://docs.gitlab.com/ee/development/contributing/)
 
-Using [Conventional Commits](COMMITS.md) is strongly recommended.
+Using [Conventional Commits](COMMITS.md) is required.
 
 ## Security vulnerability disclosure
 

scripts/check-commit-messages.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+for commit in $(git rev-list origin/HEAD..HEAD); do
+
+    commit_msg=$(git log --format=%B -n 1 "$commit")
+
+    # Skip validation in case of fixup and revert commits
+    if echo "$commit_msg" | grep -qE "^(Revert|fixup! )"; then
+    continue
+    fi
+
+    if ! echo "$commit_msg" | grep -qE "^(build|ci|docs|feat|fix|perf|refactor|style|test|chore|revert)(\([a-z, -]+\))?: "; then
+    echo "Conventional Commits validation failed for commit $commit: $commit_msg"
+    exit 1
+    fi
+done