feat: git commit user appender

src/cmd/utils/commit.go

@@ -128,3 +128,43 @@ func group_selection(group []User, excludeMode []string) []string {
 
 	return excludeMode
 }
+
+func GitCommitAppender(authors string, hash string, flags []string) error {
+	// Get old commit message
+	var cmd *exec.Cmd
+
+	// git log --format=%B -n1
+	if hash == "" {
+		cmd = exec.Command("git", "log", "--format=%B", "-n1")
+	} else {
+		cmd = exec.Command("git", "log", "--format=%B", "-n1", hash)
+	}
+
+	out, err := cmd.Output()
+	if err != nil {
+		return fmt.Errorf("error: %s", err)
+	}
+
+	// Convert the output to a string
+	old_commit := string(out)
+
+	// commit shell command
+	// specify git command1
+	input := []string{"commit"}
+	input = append(input, flags...)
+	input = append(input, "--amend", "-m", old_commit+"\n"+authors)
+	// append the message to the flags
+	// concat the git command and the flags + message
+	cmd = exec.Command("git", input...)
+
+	// https://stackoverflow.com/questions/18159704/how-to-debug-exit-status-1-error-when-running-exec-command-in-golang
+
+	cmd_output, err := cmd.CombinedOutput()
+
+	if err != nil {
+		return fmt.Errorf("error: %s : %s", err, string(cmd_output))
+	} else {
+		println(string(cmd_output))
+	}
+	return nil
+}