Function FromFile

commands/input/input.go:88–118

FromFile loads and returns the contents of a given file. If - is passed through, much like git, it will read from stdin. This can be piped data, unless there is a tty in which case the user will be prompted to enter a message.

(fileName string)

// unless there is a tty in which case the user will be prompted to enter a
// message.
func FromFile(fileName string) (string, error) {
	if fileName == "-" {
		stat, err := os.Stdin.Stat()
		if err != nil {
			return "", fmt.Errorf("Error reading from stdin: %v\n", err)
		}
		if (stat.Mode() & os.ModeCharDevice) == 0 {
			// There is no tty. This will allow us to read piped data instead.
			output, err := io.ReadAll(os.Stdin)
			if err != nil {
				return "", fmt.Errorf("Error reading from stdin: %v\n", err)
			}
			return string(output), err
		}

		fmt.Printf("(reading comment from standard input)\n")
		var output bytes.Buffer
		s := bufio.NewScanner(os.Stdin)
		for s.Scan() {
			output.Write(s.Bytes())
			output.WriteRune('\n')
		}
		return output.String(), nil
	}

	output, err := os.ReadFile(fileName)
	if err != nil {
		return "", fmt.Errorf("Error reading file: %v\n", err)
	}
	return string(output), err
}

func startInlineCommand(command string, args ...string) (*exec.Cmd, error) {
	cmd := exec.Command(command, args...)