Function removeRulesEntry

src/installer/targets/cursor.ts:208–245

* Remove the Cursor rules file on uninstall (and as a self-heal on * install — see issue #529). * * Unlike the shared CLAUDE.md / AGENTS.md files (where codegraph owns * only a marker-delimited section), `.cursor/rules/codegraph.mdc` is a * file we create OUTRIGHT — the frontmatter is ours too.

()

 * own content outside our markers do we keep the file (minus our block).
 */
function removeRulesEntry(): WriteResult['files'][number] {
  const file = rulesPath();
  if (!fs.existsSync(file)) return { path: file, action: 'not-found' };

  let content: string;
  try {
    content = fs.readFileSync(file, 'utf-8');
  } catch {
    return { path: file, action: 'not-found' };
  }

  const ourFrontmatter = MDC_FRONTMATTER.trim();
  const startIdx = content.indexOf(CODEGRAPH_SECTION_START);
  const endIdx = content.indexOf(CODEGRAPH_SECTION_END);

  // Our marked block is present — strip it, then decide what's left.
  if (startIdx !== -1 && endIdx > startIdx) {
    const before = content.substring(0, startIdx).trimEnd();
    const after = content.substring(endIdx + CODEGRAPH_SECTION_END.length).trimStart();
    const remainder = (before + (before && after ? '\n\n' : '') + after).trim();
    if (remainder === '' || remainder === ourFrontmatter) {
      try { fs.unlinkSync(file); } catch { /* ignore */ }
    } else {
      atomicWriteFileSync(file, remainder + '\n');
    }
    return { path: file, action: 'removed' };
  }

  // No block, but the file is still our pristine frontmatter-only file
  // — it's ours, so remove it.
  if (content.trim() === ourFrontmatter) {
    try { fs.unlinkSync(file); } catch { /* ignore */ }
    return { path: file, action: 'removed' };
  }

  // Foreign content we don't recognize — leave it alone.
  return { path: file, action: 'not-found' };
}

export const cursorTarget: AgentTarget = new CursorTarget();