Function countUniquePatchFiles

actions/setup/js/create_pull_request.cjs:451–467

* Counts the number of unique file paths touched by a git patch. * * `git format-patch` emits one `diff --git` header per (commit, file), so the * same file modified across multiple commits will appear multiple times. The * file-count safety limit counts unique files (i.e. how many distinct file

(patchContent)

 * @returns {number} Number of unique file paths referenced in the patch
 */
function countUniquePatchFiles(patchContent) {
  if (!patchContent || !patchContent.trim()) {
    return 0;
  }
  const files = new Set();
  const entries = extractDiffGitHeaderEntries(patchContent);
  let unparseableIdx = 0;
  for (const entry of entries) {
    const path = entry.newPath || entry.oldPath;
    if (path) {
      files.add(path);
    } else {
      files.add(`__unparseable_header_${entry.headerIndex}_${unparseableIdx++}`);
    }
  }
  return files.size;
}

/**
 * Enforces maximum limits on pull request parameters to prevent resource exhaustion attacks.