Function getFilesUsingGit

src/hooks/fileSuggestions.ts:248–383

* Get files using git ls-files (much faster than ripgrep for git repos) * Returns tracked files immediately, fetches untracked in background * @param respectGitignore If true, excludes gitignored files from untracked results * * Note: Unlike ripgrep --follow, git ls-files doesn't follow symlinks

(
  abortSignal: AbortSignal,
  respectGitignore: boolean,
)

 * This is intentional as git tracks symlinks as symlinks.
 */
async function getFilesUsingGit(
  abortSignal: AbortSignal,
  respectGitignore: boolean,
): Promise<string[] | null> {
  const startTime = Date.now()
  logForDebugging(`[FileIndex] getFilesUsingGit called`)

  // Check if we're in a git repo. findGitRoot is LRU-memoized per path.
  const repoRoot = findGitRoot(getCwd())
  if (!repoRoot) {
    logForDebugging(`[FileIndex] not a git repo, returning null`)
    return null
  }

  try {
    const cwd = getCwd()

    // Get tracked files (fast - reads from git index)
    // Run from repoRoot so paths are relative to repo root, not CWD
    const lsFilesStart = Date.now()
    const trackedResult = await execFileNoThrowWithCwd(
      gitExe(),
      ['-c', 'core.quotepath=false', 'ls-files', '--recurse-submodules'],
      { timeout: 5000, abortSignal, cwd: repoRoot },
    )
    logForDebugging(
      `[FileIndex] git ls-files (tracked) took ${Date.now() - lsFilesStart}ms`,
    )

    if (trackedResult.code !== 0) {
      logForDebugging(
        `[FileIndex] git ls-files failed (code=${trackedResult.code}, stderr=${trackedResult.stderr}), falling back to ripgrep`,
      )
      return null
    }

    const trackedFiles = trackedResult.stdout.trim().split('\n').filter(Boolean)

    // Normalize paths relative to the current working directory
    let normalizedTracked = normalizeGitPaths(trackedFiles, repoRoot, cwd)

    // Apply .ignore/.rgignore patterns if present (faster than falling back to ripgrep)
    const ignorePatterns = await loadRipgrepIgnorePatterns(repoRoot, cwd)
    if (ignorePatterns) {
      const beforeCount = normalizedTracked.length
      normalizedTracked = ignorePatterns.filter(normalizedTracked)
      logForDebugging(
        `[FileIndex] applied ignore patterns: ${beforeCount} -> ${normalizedTracked.length} files`,
      )
    }

    // Cache tracked files for later merge with untracked
    cachedTrackedFiles = normalizedTracked

    const duration = Date.now() - startTime
    logForDebugging(
      `[FileIndex] git ls-files: ${normalizedTracked.length} tracked files in ${duration}ms`,
    )