label-on-change.yml

name: label-on-change

on:
  # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target
  issues:
    types:
      - assigned
      - closed
      - labeled
      - reopened

  # TODO: Handle labeling on comment

jobs:
  on-labeled-ensure-one-status:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    # Only run on issue labeled and if label starts with 'status:'
    if: github.event.action == 'labeled' && startsWith(github.event.label.name, 'status:')
    steps:
      - name: Ensure only one status label
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            // Get all labels that start with 'status:' and are not the incoming label
            const incomingLabelName = context.payload.label.name;
            const labelNamesToRemove = context.payload.issue.labels
              .filter(label => label.name.startsWith('status:') && label.name !== incomingLabelName)
              .map(label => label.name);

            if (!labelNamesToRemove.length) {
              console.log('No labels to remove');
              return;
            }

            console.log(`Labels to remove: '${labelNamesToRemove}'`);

            // If there is more than one status label, remove all but the incoming label
            for (const labelName of labelNamesToRemove) {
              await github.rest.issues.removeLabel({
                issue_number: context.issue.number,
                name: labelName,
                owner: context.repo.owner,
                repo: context.repo.repo,
              });
              console.log(`Removed '${labelName}' label`);
            }

  on-issue-close:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    if: github.event.action == 'closed'
    steps:
      - name: Remove all labels on issue close
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            // Get all labels that start with 'status:' and 'stale'
            const labelNamesToRemove = context.payload.issue.labels
              .filter(label => label.name.startsWith('status:') || label.name === 'stale')
              .map(label => label.name);

            if (!labelNamesToRemove.length) {
              console.log('No labels to remove');
              return;
            }

            console.log(`Labels to remove: '${labelNamesToRemove}'`);

            for (const labelName of labelNamesToRemove) {
              await github.rest.issues.removeLabel({
                issue_number: context.issue.number,
                name: labelName,
                owner: context.repo.owner,
                repo: context.repo.repo,
              });
              console.log(`Removed '${labelName}' label`);
            }

  on-issue-reopen:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    if: github.event.action == 'reopened'
    steps:
      - name: Add needs-triage label on issue reopen
        uses: actions-ecosystem/action-add-labels@v1
        with:
          labels: 'status: needs-triage'

  on-issue-assigned:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    if: >
      github.event.action == 'assigned' &&
      contains(github.event.issue.labels.*.name, 'status: needs-triage')
    steps:
      - name: Remove needs-triage label on issue assign
        uses: actions-ecosystem/action-remove-labels@v1
        with:
          labels: 'status: needs-triage'

  # on-pr-merge:
  #   runs-on: ubuntu-latest
  #   if: github.event.pull_request.merged == true
  #   steps:

  # on-pr-close:
  #   runs-on: ubuntu-latest
  #   if: github.event_name == 'pull_request_target' && github.event.pull_request.merged == false
  #   steps: