name: PR title

# Pull requests are squash-merged, so the title becomes the commit on main
# and the changelog line (cliff.toml): it must start with a conventional
# commit type. feat, fix and perf are listed in the changelog; the rest
# aren't. Brackets and a missing space are fine too; the changelog writes
# them all as "feat: …".
#
#   feat: SOPS and .env files in git repos
#   fix(search): ctrl+r with empty results loads the scope
#   feat!: rename config keys          (! marks a breaking change)
#   [feat] install with a one-liner
#   [fix]: hide values on blur
#   docs:split the README

on:
  pull_request:
    branches: [main]
    types: [opened, edited, reopened, synchronize]

jobs:
  title:
    name: Conventional title
    runs-on: ubuntu-latest
    steps:
      - name: Check the title
        env:
          TITLE: ${{ github.event.pull_request.title }}
        run: |
          types='feat|fix|perf|refactor|docs|test|ci|chore|build|style|revert'
          scope='(\([a-z0-9._/-]+\))?'
          if [[ "$TITLE" =~ ^\[($types)$scope!?\]!?:?[[:space:]]*(.*)$ ]] ||
            [[ "$TITLE" =~ ^($types)$scope!?:[[:space:]]*(.*)$ ]]; then
            what="${BASH_REMATCH[3]}"
          fi
          if [[ "${what:-}" =~ [^[:space:]] ]]; then
            echo "ok: $TITLE"
          else
            echo "::error::The title should start with a type, like \"feat: what changed\" or \"[feat] what changed\"; types: ${types//|/, }. feat, fix and perf titles are the changelog's lines. Got: $TITLE"
            exit 1
          fi