milestone-release.yml

name: milestone-release

on:
  milestone:
    types: [created, edited, deleted, closed, opened]
  issues:
    types: [opened, edited, closed, reopened, deleted, milestoned, demilestoned]
  pull_request:
    types: [opened, edited, closed, reopened, milestoned, demilestoned]
  workflow_dispatch:
    inputs:
      milestone:
        description: 'Milestone title to rebuild (leave empty to rebuild all)'
        required: false
        type: string

permissions:
  contents: write

jobs:
  sync-release:
    runs-on: ubuntu-latest
    steps:
      - name: Sync Release with Milestone
        uses: actions/github-script@v7
        with:
          script: |
            const { owner, repo } = context.repo;

            async function syncMilestone(milestone) {
              const milestoneTitle = milestone.title;
              const milestoneNumber = milestone.number;

              // Find existing release by tag_name (includes drafts)
              let release = null;
              for await (const response of github.paginate.iterator(
                github.rest.repos.listReleases,
                { owner, repo, per_page: 100 }
              )) {
                release = response.data.find(r => r.tag_name === milestoneTitle);
                if (release) break;
              }

              // Fetch all issues and PRs in milestone
              const items = [];
              for await (const response of github.paginate.iterator(
                github.rest.issues.listForRepo,
                { owner, repo, milestone: milestoneNumber, state: 'all', per_page: 100 }
              )) {
                items.push(...response.data);
              }

              // Sort by number and generate body
              items.sort((a, b) => a.number - b.number);
              const body = items.map(item => {
                const checkbox = item.state === 'closed' ? '[x]' : '[ ]';
                return `- ${checkbox} [#${item.number}](${item.html_url}) ${item.title}`;
              }).join('\n');

              // Determine if release should be draft or published
              const isDraft = milestone.state === 'open';

              if (release) {
                await github.rest.repos.updateRelease({
                  owner, repo,
                  release_id: release.id,
                  name: milestoneTitle,
                  body: body || 'No issues in this milestone yet.',
                  draft: isDraft
                });
                console.log(`Updated release: ${milestoneTitle}`);
              } else {
                // Check if tag exists before creating release
                let tagExists = false;
                try {
                  await github.rest.git.getRef({
                    owner, repo,
                    ref: `tags/${milestoneTitle}`
                  });
                  tagExists = true;
                } catch (error) {
                  if (error.status !== 404) throw error;
                }

                if (tagExists) {
                  await github.rest.repos.createRelease({
                    owner, repo,
                    tag_name: milestoneTitle,
                    name: milestoneTitle,
                    body: body || 'No issues in this milestone yet.',
                    draft: isDraft
                  });
                  console.log(`Created release: ${milestoneTitle}`);
                } else {
                  console.log(`Skipping release creation: tag '${milestoneTitle}' does not exist`);
                }
              }
            }

            // Handle manual trigger - rebuild all or specific milestone
            if (context.eventName === 'workflow_dispatch') {
              const inputMilestone = context.payload.inputs?.milestone;
              const milestones = [];
              for await (const response of github.paginate.iterator(
                github.rest.issues.listMilestones,
                { owner, repo, state: 'all', per_page: 100 }
              )) {
                milestones.push(...response.data);
              }

              for (const ms of milestones) {
                if (!inputMilestone || ms.title === inputMilestone) {
                  await syncMilestone(ms);
                }
              }
              return;
            }

            // Get milestone from event
            let milestone = context.payload.milestone;
            if (!milestone && context.payload.issue?.milestone) {
              milestone = context.payload.issue.milestone;
            }
            if (!milestone && context.payload.pull_request?.milestone) {
              milestone = context.payload.pull_request.milestone;
            }
            if (!milestone) {
              console.log('No milestone associated with this event');
              return;
            }

            const eventAction = context.payload.action;

            // Handle milestone deleted
            if (context.eventName === 'milestone' && eventAction === 'deleted') {
              const milestoneTitle = milestone.title;
              let release = null;
              for await (const response of github.paginate.iterator(
                github.rest.repos.listReleases,
                { owner, repo, per_page: 100 }
              )) {
                release = response.data.find(r => r.tag_name === milestoneTitle);
                if (release) break;
              }
              if (release) {
                await github.rest.repos.deleteRelease({
                  owner, repo, release_id: release.id
                });
                console.log(`Deleted release for milestone: ${milestoneTitle}`);
              }
              return;
            }

            await syncMilestone(milestone);