Function postOrUpdatePrComment

packages/bumpy/src/commands/ci.ts:1717–1763

(
  prNumber: string,
  body: string,
  rootDir: string,
  marker: string = COMMENT_MARKER,
)

        } else if (r.isCascadeBump) {
          lines.push('- Version bump via cascade rule');
        }

        lines.push('');
      }
    }

    if (showNoPatWarning) {
      lines.push(
        '> ⚠️ `BUMPY_GH_TOKEN` is not set — CI checks will not run automatically on this PR. Run `bumpy ci setup` for help.',
      );
      lines.push('');
    }

    return lines.join('\n');
  };

  const full = render(true);
  if (full.length <= GH_BODY_SAFE) return full;

  // Too long for GitHub — drop the inline change summaries and keep just the
  // version-bump list. This is rare (dozens of packages or huge changelogs).
  const compact = render(false);
  if (compact.length <= GH_BODY_SAFE) return compact;

  // Still too long (an enormous number of packages) — hard-truncate.
  const notice = '\n\n> ⚠️ This release list was truncated because it exceeds GitHub’s size limit.';
  return compact.slice(0, GH_BODY_MAX - notice.length) + notice;
}

const COMMENT_MARKER = '<!-- bumpy-release-plan -->';
const SNAPSHOT_COMMENT_MARKER = '<!-- bumpy-snapshot -->';

async function postOrUpdatePrComment(
  prNumber: string,
  body: string,
  rootDir: string,
  marker: string = COMMENT_MARKER,
): Promise<void> {
  const validPr = validatePrNumber(prNumber);
  const markedBody = `${marker}\n${body}`;

  try {
    // Find existing bumpy comment using gh with jq. The marker keeps each kind of comment
    // (release plan vs snapshot) independent, so they don't overwrite each other.
    const jqFilter = `.comments[] | select(.body | startswith("${marker}")) | .url | capture("issuecomment-(?<id>[0-9]+)$") | .id`;
    const existingComment = tryRunArgs(['gh', 'pr', 'view', validPr, '--json', 'comments', '--jq', jqFilter], {
      cwd: rootDir,
    });

    // Take the first result if multiple