name: Label issue version

# Issue forms can't let a reporter set a label directly (that needs triage rights),
# so the bug/feature forms carry a "Version line" dropdown and this workflow reads
# the submitted value and applies the matching v1/v2 label on their behalf.
on:
  issues:
    types: [opened, edited]

permissions:
  issues: write

concurrency:
  group: issue-version-${{ github.event.issue.number }}
  cancel-in-progress: true

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v9
        with:
          script: |
            const body = context.payload.issue.body || '';
            // Pull the "Version line" section out of the rendered issue form.
            const section = body.split(/^###\s+/m).find(s => /^Version line/i.test(s)) || '';
            const m = section.match(/\bv([12])\b/i);
            if (!m) {
              core.info('No version line found; nothing to label.');
              return;
            }
            const choice = 'v' + m[1];
            const other = choice === 'v2' ? 'v1' : 'v2';
            await github.rest.issues.addLabels({
              ...context.repo,
              issue_number: context.issue.number,
              labels: [choice],
            });
            // Keep v1/v2 mutually exclusive in case an edit flipped the choice.
            try {
              await github.rest.issues.removeLabel({
                ...context.repo,
                issue_number: context.issue.number,
                name: other,
              });
            } catch (e) {
              core.info(`No ${other} label to remove.`);
            }