Function detectArrivedChannelFiles

packages/bumpy/src/commands/ci.ts:841–864

* Channels whose dirs gained bump files in the triggering push — i.e. this push is * the promotion/graduation merge that delivered them. (Same range detection as the * channel publish trigger.)

(rootDir: string, config: BumpyConfig)

 * channel publish trigger.)
 */
function detectArrivedChannelFiles(rootDir: string, config: BumpyConfig): Set<string> {
  const range = getPushEventRange();
  let diffRange: string;
  if (range) {
    diffRange = `${range.before}..${range.after}`;
  } else {
    if (!tryRunArgs(['git', 'rev-parse', '--verify', 'HEAD^'], { cwd: rootDir })) return new Set();
    diffRange = 'HEAD^..HEAD';
  }
  // --no-renames so file moves into channel dirs show up as additions
  const out = tryRunArgs(
    ['git', 'diff', '--name-only', '--diff-filter=A', '--no-renames', diffRange, '--', '.bumpy/'],
    { cwd: rootDir },
  );
  if (!out) return new Set();
  const knownChannels = new Set(channelNames(config));
  const arrived = new Set<string>();
  for (const f of out.split('\n')) {
    if (!f.endsWith('.md') || f.endsWith('README.md')) continue;
    const parts = f.split('/'); // .bumpy/<channel>/<id>.md
    if (parts.length === 3 && knownChannels.has(parts[1]!)) arrived.add(parts[1]!);
  }
  return arrived;
}

/**
 * Close lingering channel release PRs whose cycles were promoted: once a channel's