"bufio"
	"bytes"

	"strconv"

// unquote tries to unquote various types of quoted strings, and returns the
// result. If none of the formats works, it returns s unchanged except for
// trimming off whitespace.
func unquote(s string) string {
	s = strings.TrimSpace(s)
	switch {
	case strings.HasPrefix(s, "'''") && strings.HasSuffix(s, "'''"):
		return strings.TrimPrefix(strings.TrimSuffix(s, "'''"), "'''")
	case strings.HasPrefix(s, "'") && strings.HasSuffix(s, "'"):
		return strings.TrimPrefix(strings.TrimSuffix(s, "'"), "'")
	case strings.HasPrefix(s, "\"") && strings.HasSuffix(s, "\""):
		unquoted, err := strconv.Unquote(s)
		if err == nil {
			return unquoted
		}
	}
	return s
}
var authorsHeader = []byte("\n[[authors]]\n")

			// Since the email address is missing from the log,
			// we'll try to find it in the output of pijul change.
			changeInfo, err := exec.Command("pijul", "change", c.Hash).Output()
			if err != nil {
				printErrorAndExit("Error from pijul change:", err)
			}
			if i := bytes.Index(changeInfo, authorsHeader); i != -1 {
				var name, email string
				s := bufio.NewScanner(bytes.NewReader(changeInfo[i+len(authorsHeader):]))
				for s.Scan() {
					line := s.Text()
					if line == "" {
						break
					}
					if strings.HasPrefix(line, "email =") {
						email = unquote(strings.TrimPrefix(line, "email ="))
					} else if strings.HasPrefix(line, "name =") {
						name = unquote(strings.TrimPrefix(line, "name ="))
					}
				}
				if name != "" && email != "" {
					author = name + " <" + email + ">"
				}
			}