Function GetCommitRangeFileStats

vcs/git/git_stats.go:212–293

GetCommitRangeFileStats returns statistics (additions/deletions) for files changed between two commits. Returns a map from absolute file paths to their FileStats.

(repoPath, fromCommit, toCommit string)

// GetCommitRangeFileStats returns statistics (additions/deletions) for files changed between two commits.
// Returns a map from absolute file paths to their FileStats.
func GetCommitRangeFileStats(repoPath, fromCommit, toCommit string) (map[string]vcs.FileStats, error) {
	// Validate the repository path exists
	if _, err := os.Stat(repoPath); os.IsNotExist(err) {
		return nil, fmt.Errorf("repository path does not exist: %s", repoPath)
	}

	// Verify it's a git repository
	if !isGitRepository(repoPath) {
		return nil, fmt.Errorf("%s is not a git repository", repoPath)
	}

	// Validate both commits exist
	if err := validateCommit(repoPath, fromCommit); err != nil {
		return nil, err
	}
	if err := validateCommit(repoPath, toCommit); err != nil {
		return nil, err
	}

	// Get the repository root
	repoRoot, err := GetRepositoryRoot(repoPath)
	if err != nil {
		return nil, fmt.Errorf("failed to get repository root: %w", err)
	}

	// Run git diff --numstat to get stats for the range
	stdout, stderr, err := runGitCommand(repoPath, "diff", "--numstat", fromCommit, toCommit)
	if err != nil {
		return nil, gitCommandError(err, stderr)
	}

	// Get file statuses to determine if files are new
	statusMap, err := getCommitRangeFileStatuses(repoPath, fromCommit, toCommit)
	if err != nil {
		return nil, err
	}

	// Parse the numstat output
	stats := make(map[string]vcs.FileStats)
	lines := strings.Split(string(stdout), "\n")
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" {
			continue
		}

		// Format: additions	deletions	filename
		parts := strings.Fields(line)
		if len(parts) < 3 {
			continue
		}

		additions := 0
		deletions := 0

		// Parse additions (may be "-" for binary files)
		if parts[0] != "-" {
			additions, _ = strconv.Atoi(parts[0])