semconv.yml

name: SemConv

on:
  pull_request_target:
    types:
      - opened
      - edited
      - synchronize
      - reopened

permissions:
  pull-requests: read

jobs:
  validate:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - name: Validate pull request title and commits
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          REPOSITORY: ${{ github.repository }}
        run: |
          pattern='^(feat|fix|chore)(\([A-Za-z0-9][A-Za-z0-9._/-]*\))?!?: .+'

          if [[ ! "$PR_TITLE" =~ $pattern ]]; then
            echo "Invalid pull request title: $PR_TITLE" >&2
            exit 1
          fi

          if ! commit_records=$(gh api --paginate \
            "repos/$REPOSITORY/pulls/$PR_NUMBER/commits" \
            --jq '.[] | {
              parent_count: (.parents | length),
              subject: (.commit.message | split("\n")[0])
            }'); then
            echo "Unable to enumerate pull request commits." >&2
            exit 1
          fi

          if [ -z "$commit_records" ]; then
            echo "Pull request contains no commits." >&2
            exit 1
          fi

          invalid_commits=0
          non_merge_commits=0
          while IFS= read -r record; do
            if ! parent_count=$(jq -er '.parent_count' <<< "$record") ||
              ! subject=$(jq -er '.subject' <<< "$record"); then
              echo "Unable to parse pull request commit metadata." >&2
              exit 1
            fi

            if [ "$parent_count" -gt 1 ]; then
              continue
            fi

            non_merge_commits=$((non_merge_commits + 1))
            if [[ ! "$subject" =~ $pattern ]]; then
              echo "Invalid commit subject: $subject" >&2
              invalid_commits=1
            fi
          done <<< "$commit_records"

          if [ "$non_merge_commits" -eq 0 ]; then
            echo "Pull request contains no non-merge commits." >&2
            exit 1
          fi

          exit "$invalid_commits"