prs-check-label-title-sync.yml

name: Check PR labels and title sync

on:
  pull_request:
    types: [opened, reopened, labeled, unlabeled, edited, synchronize]

permissions: {}

jobs:
  check_label_title_sync:
    runs-on: ubuntu-latest
    name: Check label and title sync
    steps:
      - name: Check label matches title
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          script: |
            const pr = context.payload.pull_request;
            const title = pr.title.toLowerCase();
            const existingLabels =
              pr.labels?.map((label) => label.name.toLowerCase()) || [];
            const titleLabels = Array.from(
              title.matchAll(/(?:\[([^\]]+)\])/g),
              (match) => match[1]
            );
            const expectedLabelsFromTitle = titleLabels
              .map((label) => {
                if (label.endsWith("-pro")) {
                  return "plan: Pro";
                }
                if (label.endsWith("-premium")) {
                  return "plan: Premium";
                }
                if (label === "docs") {
                  return "docs";
                }
                return null;
              })
              .filter(Boolean);

            if (expectedLabelsFromTitle.length === 0) {
              return;
            }

            const missingLabels = expectedLabelsFromTitle.filter(
              (label) => !existingLabels.includes(label.toLowerCase())
            );

            if (
              missingLabels.length > 0
            ) {
              core.setFailed(
                `Title indicates labels that are missing: [${missingLabels.join(
                  ", "
                )}]. Please add them to the PR labels.`
              );
            } else {
              core.info('No missing labels detected based on title.');
            }