Method getChangedFiles

src/extraction/index.ts:2935–3022

* Get files that have changed since last index. * Uses git status as a fast path when available, falling back to full scan.

()

   * Uses git status as a fast path when available, falling back to full scan.
   */
  getChangedFiles(): { added: string[]; modified: string[]; removed: string[] } {
    const gitChanges = getGitChangedFiles(this.rootDir);

    if (gitChanges) {
      // === Git fast path ===
      const added: string[] = [];
      const modified: string[] = [];
      const removed: string[] = [];

      // Deleted files — only report if tracked in DB
      for (const filePath of gitChanges.deleted) {
        const tracked = this.queries.getFileByPath(filePath);
        if (tracked) {
          removed.push(filePath);
        }
      }

      // Modified + added files — read + hash, compare with DB. Untracked (`??`)
      // files stay untracked in git even after indexing, so they must be
      // hash-compared like modified files instead of always counting as added —
      // otherwise status reports them as pending forever. (See issue #206.)
      for (const filePath of [...gitChanges.modified, ...gitChanges.added]) {
        const fullPath = path.join(this.rootDir, filePath);
        let content: string;
        try {
          content = fs.readFileSync(fullPath, 'utf-8');
        } catch (error) {
          logDebug('Skipping unreadable file while detecting changes', { filePath, error: String(error) });
          continue;
        }

        const contentHash = hashContent(content);
        const tracked = this.queries.getFileByPath(filePath);

        if (!tracked) {
          added.push(filePath);
        } else if (tracked.contentHash !== contentHash) {
          modified.push(filePath);
        }
      }

      return { added, modified, removed };
    }

    // === Fallback: full scan (non-git project or git failure) ===
    const currentFiles = new Set(scanDirectory(this.rootDir));
    const trackedFiles = this.queries.getAllFiles();

    // Build Map for O(1) lookups
    const trackedMap = new Map<string, FileRecord>();
    for (const f of trackedFiles) {
      trackedMap.set(f.path, f);
    }

    const added: string[] = [];
    const modified: string[] = [];
    const removed: string[] = [];