Function walk

src/extraction/index.ts:1028–1098

(dir: string, matchers: ScopedIgnore[])

  };

  function walk(dir: string, matchers: ScopedIgnore[]): void {
    let realDir: string;
    try {
      realDir = fs.realpathSync(dir);
    } catch {
      logDebug('Skipping unresolvable directory', { dir });
      return;
    }

    if (visitedDirs.has(realDir)) {
      logDebug('Skipping already-visited directory (symlink cycle)', { dir, realDir });
      return;
    }
    visitedDirs.add(realDir);

    // This directory's own .gitignore (if present) applies to everything below it.
    // The root's .gitignore is already merged into the seeded base matcher (so a
    // negation there can override a built-in default), so skip it here.
    const own = dir === rootDir ? null : loadIgnore(dir);
    const active = own ? [...matchers, own] : matchers;

    let entries: fs.Dirent[];
    try {
      entries = fs.readdirSync(dir, { withFileTypes: true });
    } catch (error) {
      logDebug('Skipping unreadable directory', { dir, error: String(error) });
      return;
    }

    for (const entry of entries) {
      // Never descend into git internals or any CodeGraph data directory
      // (the active one or a sibling another environment created — #636).
      if (entry.name === '.git' || isCodeGraphDataDir(entry.name)) continue;

      const fullPath = path.join(dir, entry.name);
      const relativePath = normalizePath(path.relative(rootDir, fullPath));

      if (entry.isSymbolicLink()) {
        try {
          const realTarget = fs.realpathSync(fullPath);
          const stat = fs.statSync(realTarget);
          if (stat.isDirectory()) {
            if (!isIgnored(fullPath, true, active)) {
              walk(fullPath, active);
            }
          } else if (stat.isFile()) {
            if (!isIgnored(fullPath, false, active) && isSourceFile(relativePath, overrides)) {
              files.push(relativePath);
              count++;
              onProgress?.(count, relativePath);
            }
          }
        } catch {
          logDebug('Skipping broken symlink', { path: fullPath });
        }
        continue;
      }