Class NodeGit

src/lib/git.ts:95–216

 * Node.js implementation of the Git interface using git CLI commands
 */
export class NodeGit implements Git {
  private gitRepoCache = new Map<string, boolean>();
  private gitIgnoreCache = new Map<
    string,
    { filter: GitIgnoreFilter; mtime: number }
  >();

  isGitRepository(dir: string): boolean {
    const normalizedDir = path.resolve(dir);

    const cached = this.gitRepoCache.get(normalizedDir);
    if (cached !== undefined) {
      return cached;
    }

    let isGit = false;
    try {
      const result = spawnSync("git", ["rev-parse", "--git-dir"], {
        cwd: dir,
        encoding: "utf-8",
      });
      isGit = result.status === 0 && !result.error;
    } catch {
      isGit = false;
    }

    this.gitRepoCache.set(normalizedDir, isGit);
    return isGit;
  }

  /**
   * Gets gitignore content from a git repository
   */
  getGitIgnoreContent(repoRoot: string): string | null {
    try {
      const gitignorePath = path.join(repoRoot, ".gitignore");
      if (fs.existsSync(gitignorePath)) {
        return fs.readFileSync(gitignorePath, "utf-8");
      }
    } catch (error) {
      // Log error but don't fail - .gitignore is optional
      console.error(
        `Warning: Failed to read .gitignore in ${repoRoot}:`,
        error,
      );
    }
    return null;
  }

  /**
   * Gets files using git ls-files when in a git repository
   */
  *getGitFiles(dirRoot: string): Generator<string> {
    try {
      const run = (args: string[]) => {
        const res = spawnSync("git", args, {
          cwd: dirRoot,
          encoding: "utf-8",