check-milestone.yml

name: Milestone Reminder

on:
  pull_request:

jobs:
  milestone-reminder:
    name: Remind to set milestone
    runs-on: ubuntu-22.04
    timeout-minutes: 5
    permissions:
      pull-requests: write
      issues: read
    steps:
      - uses: actions/github-script@v7
        with:
          script: | # js
            const { getLinkedIssues } = require('${{ github.workspace }}/release/utils/index.cjs');
            const owner = context.repo.owner;
            const repo = context.repo.repo;

            const pullNumber = '${{ github.event.pull_request.number }}';


            function getMilestone(pullOrIssue) {
              // pull has pull.data.milestone, issue has issue.milestone
              return pullOrIssue?.data?.milestone || pullOrIssue?.milestone;
            }

            const pull = await github.rest.pulls.get({
              owner,
              repo,
              pull_number: pullNumber,
            });

            if (getMilestone(pull)) {
              console.log("Pull request has milestone", pull.data.milestone?.title);
              process.exit(0);
            }

            // the github API doesn't expose linked issues, so we have to parse the body ourselves
            const linkedIssues = getLinkedIssues(pull);

            if (Array.isArray(linkedIssues) && linkedIssues.length > 0) {
              console.log('linked issue(s) found');

              linkedIssues.forEach((issueId, index) => {
                const issue = await github.rest.issues.get({
                  owner,
                  repo,
                  issue_number: issueId,
                });

                const milestone = getMilestone(issue);

                if (milestone) {
                  console.log(`Linked issue #${issueId} has milestone`, milestone.title);
                  index === linkedIssues.length -1 && process.exit(0);
                } else {
                    console.log("No milestone found");

                    const author = pull.data.user.login;
                    const guideLink = "https://www.notion.so/metabase/Metabase-Branching-Strategy-6eb577d5f61142aa960a626d6bbdfeb3?pvs=4#3dea255ffa3b4f74942a227844e889fa";
                    const message = `@${author} Did you forget to add a milestone to the issue for this PR? _[When and where should I add a milestone?](${guideLink})_`;

                    await github.rest.issues.createComment({
                      owner,
                      repo,
                      issue_number: pullNumber,
                      body: message,
                    });

                    // Exit as soon as we found an issue without a milestone and alerted the author.
                    process.exit(0);
                }
              });
            }