Function parseGitHeaderData

pkg/gitdiff/file_header.go:262–300

parseGitHeaderData parses a single line of metadata from a Git file header. It returns true when header parsing is complete; in that case, line was the first line of non-header content.

(f *File, line, defaultName string)

// It returns true when header parsing is complete; in that case, line was the
// first line of non-header content.
func parseGitHeaderData(f *File, line, defaultName string) (end bool, err error) {
	if len(line) > 0 && line[len(line)-1] == '\n' {
		line = line[:len(line)-1]
	}

	for _, hdr := range []struct {
		prefix string
		end    bool
		parse  func(*File, string, string) error
	}{
		{"@@ -", true, nil},
		{"--- ", false, parseGitHeaderOldName},
		{"+++ ", false, parseGitHeaderNewName},
		{"old mode ", false, parseGitHeaderOldMode},
		{"new mode ", false, parseGitHeaderNewMode},
		{"deleted file mode ", false, parseGitHeaderDeletedMode},
		{"new file mode ", false, parseGitHeaderCreatedMode},
		{"copy from ", false, parseGitHeaderCopyFrom},
		{"copy to ", false, parseGitHeaderCopyTo},
		{"rename old ", false, parseGitHeaderRenameFrom},
		{"rename new ", false, parseGitHeaderRenameTo},
		{"rename from ", false, parseGitHeaderRenameFrom},
		{"rename to ", false, parseGitHeaderRenameTo},
		{"similarity index ", false, parseGitHeaderScore},
		{"dissimilarity index ", false, parseGitHeaderScore},
		{"index ", false, parseGitHeaderIndex},
	} {
		if strings.HasPrefix(line, hdr.prefix) {
			if hdr.parse != nil {
				err = hdr.parse(f, line[len(hdr.prefix):], defaultName)
			}
			return hdr.end, err
		}
	}

	// unknown line indicates the end of the header
	// this usually happens if the diff is empty
	return true, nil
}

func parseGitHeaderOldName(f *File, line, defaultName string) error {
	name, _, err := parseName(line, '\t', 1)