pr-merge.yml

name: Pull Request Review Action
on:
    pull_request_review:
        types:
          - submitted

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
    check-pr-label:
        permissions:
          issues: write
        if: ${{ github.event.review.state == 'approved' }}
        runs-on: ubuntu-latest
        steps:
          - uses: actions/checkout@v3
          - name: Check for PR description label
            id: check_pr_description_label
            run: |
              python scripts/process_message.py "${TEXT_BODY}" > processed_body.txt
              processed_body=$(cat processed_body.txt)
              proposed_version_impact=$(echo "$processed_body" | awk '/Major \\\(when you make incompatible API changes\\\)/,/Patch \\\(when you make backward compatible bug fixes\\\)/')
              is_major=$(echo "$proposed_version_impact" | grep -qi '\[X\] Major'; echo $((1-$?)))
              is_minor=$(echo "$proposed_version_impact" | grep -qi '\[X\] Minor'; echo $((1-$?)))
              is_patch=$(echo "$proposed_version_impact" | grep -qi '\[X\] Patch'; echo $((1-$?)))
              num_labels_chosen=$(($is_major + $is_minor + $is_patch))
              echo "num_labels_chosen=$num_labels_chosen" >> $GITHUB_OUTPUT
              if [[ "$num_labels_chosen" -eq 0 ]]; then
                echo "message=$(echo "@${MERGE_AUTHOR} Each PR must have a SEMVER impact label, please remember to label the PR properly.")" >> $GITHUB_OUTPUT
              elif [[ "$num_labels_chosen" -ge 2 ]]; then
                echo "message=$(echo "@${MERGE_AUTHOR} Each PR can only have one SEMVER impact label, please remember to label the PR properly.")" >> $GITHUB_OUTPUT
              else
                echo "message=$(echo "SEMVER impact selected.")" >> $GITHUB_OUTPUT
                echo "chosen_label=$(
                    if [ "$is_major" -eq 1 ]; then
                        echo "r.Major"
                    elif [ "$is_minor" -eq 1 ]; then
                        echo "r.Minor"
                    elif [ "$is_patch" -eq 1 ]; then
                        echo "r.Patch"
                    fi
                 )" >> $GITHUB_OUTPUT
              fi
            env:
              TEXT_BODY: ${{ github.event.pull_request.body }}
              MERGE_AUTHOR: ${{ github.event.sender.login }}
          - name: Assign label based on version impact
            uses: actions/github-script@v7
            with:
                script: |
                    if (process.env.NUM_LABELS_CHOSEN != 1) {
                      github.rest.issues.createComment({
                        issue_number: context.payload.pull_request.number,
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        body: process.env.MESSAGE,
                      });
                    } else {
                        github.rest.issues.addLabels({
                            issue_number: context.payload.pull_request.number,
                            owner: context.repo.owner,
                            repo: context.repo.repo,
                            labels: [process.env.CHOSEN_LABEL]
                        });
                    }
            env:
                NUM_LABELS_CHOSEN: ${{ steps.check_pr_description_label.outputs.num_labels_chosen }}
                MESSAGE: ${{ steps.check_pr_description_label.outputs.message }}
                CHOSEN_LABEL: ${{ steps.check_pr_description_label.outputs.chosen_label }}