lint-commit.yml

name: Lint commit messages

on: pull_request_target

jobs:
  lint_commits:
    runs-on: ubuntu-latest
    if: always() && github.repository == 'oddlama/vane'

    steps:
      - uses: actions/checkout@v2.3.1
        with:
          fetch-depth: 0
          persist-credentials: false
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/setup-node@v3.4.1
        with:
          node-version: 16
      - run: |
          # Setup commitlint
          if ! yarn add {ts-node, @commitlint/{config-conventional,cli}} >> /dev/null 2>&1; then
            exit 0
          fi
          
          echo "module.exports = {extends: ['@commitlint/config-conventional']}" > commitlint.config.js
          
          # Get the PR commits
          FIRST_COMMIT_SHA=$(curl -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" ${{ github.event.pull_request.commits_url }} | jq -r '.[0].sha')
          commit_log=$(git log $FIRST_COMMIT_SHA^...HEAD --pretty=format:"%s")
          readarray -t commits <<<"$commit_log"
          
          errors=()
          for commit in "${commits[@]}"; do
            if ! echo $commit | yarn -s run commitlint -q; then
              errors+=( "$commit" )
            fi
          done
          
          if (( ${#errors[@]} )); then
            printf "One or more of the commits in this PR do not follow the Conventional Commits style:\n\n"
            
            for error in "${errors[@]}"; do
              echo "$error"
            done
            
            echo "CONTAINS_ERRORS=1" >> $GITHUB_ENV
            exit 1
          else
            exit 0
          fi

      - name: Comment on PR
        if: ${{ failure() && env.CONTAINS_ERRORS == '1' && !github.event.pull_request.draft }}
        uses: thollander/actions-comment-pull-request@v1
        with:
          message: |
            Hello!
            
            One or more of the commits in this PR do not follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) style. See the `lint_commits` job for more details. Please modify your commit message(s) with [git commit --amend](https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/changing-a-commit-message) and force push those changes to update this PR.
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}