sync-backport-changelog.yml

name: Sync Core Backport Issue

on:
    push:
        branches:
            - trunk
    issues:
        types: [labeled]

# Disable permissions for all available scopes by default.
# Any needed permissions should be configured at the job level.
permissions: {}

jobs:
    sync-backport-changelog:
        name: Sync Core Backport Issue
        runs-on: ubuntu-latest
        permissions:
            contents: read
            issues: write
        if: >
            github.event_name == 'push' ||
            (
                github.event_name == 'issues' &&
                github.event.action == 'labeled' &&
                github.event.label.name == '🤖 Sync Backport Changelog'
            )
        steps:
            - name: Checkout
              uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
              with:
                  fetch-depth: 2 # Fetch the last two commits to compare changes
                  persist-credentials: false
            - name: Check for changes in backport-changelog
              if: github.event_name == 'push'
              run: |
                  if git diff --quiet HEAD^ HEAD -- backport-changelog; then
                      echo "skip_sync=true" >> "$GITHUB_ENV"
                  fi
            - name: Sync Issue
              if: ${{ ! env.skip_sync }}
              uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
              with:
                  script: |
                      const labelName = '🤖 Sync Backport Changelog';
                      const issues = await github.paginate(github.rest.issues.listForRepo, {
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        labels: [labelName],
                        state: 'open',
                        per_page: 1,
                      });

                      if (issues.length === 0) {
                        console.log(`No issues found with the "${labelName}" label.`);
                        return;
                      }

                      const [latestIssue] = issues;
                      const versionMatch = latestIssue.title.match(/(\d+\.\d+)/);
                      if (!versionMatch) {
                        console.log('Could not find a version number in the latest issue title.');
                        return;
                      }

                      const version = versionMatch[1];
                      console.log(`Latest version: ${version}`);

                      const { execSync } = require('child_process');
                      const processedChangelog = execSync(`awk '/./ {print ($0 ~ /^[-*]/ ? "  " : "- ") $0}' backport-changelog/${version}/*.md`).toString().trim();

                      const startDelimiter = '<!-- START TRUNK BACKPORT CHANGELOG -->';
                      const endDelimiter = '<!-- END TRUNK BACKPORT CHANGELOG -->';
                      const autoGeneratedContent = `${startDelimiter}\n${processedChangelog}\n${endDelimiter}`;

                      const existingBody = latestIssue.body ?? '';

                      let newBody;

                      const regex = new RegExp(`${startDelimiter}[\\s\\S]*${endDelimiter}`);
                      if (regex.test(existingBody)) {
                        // If delimiters exist, replace the content between them
                        newBody = existingBody.replace(regex, autoGeneratedContent);
                      } else {
                        // If delimiters don't exist, append the new content at the end
                        newBody = `${existingBody}\n\n${autoGeneratedContent}`;
                      }

                      if (newBody.trim() !== existingBody.trim()) {
                        await github.rest.issues.update({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          issue_number: latestIssue.number,
                          body: newBody
                        });
                        console.log('Issue description updated successfully.');
                      } else {
                        console.log('Issue description is already up to date.');
                      }