Prompt prompts the user for a answer
(prompt string, def bool)
| 10 | |
| 11 | // Prompt prompts the user for a answer |
| 12 | func Prompt(prompt string, def bool) (bool, error) { |
| 13 | |
| 14 | // display the prompt |
| 15 | fmt.Printf("%s: ", prompt) |
| 16 | |
| 17 | // read one byte at a time until newline to avoid buffering past the |
| 18 | // end of the current line, which would consume input intended for |
| 19 | // subsequent Prompt calls on the same stdin |
| 20 | var line []byte |
| 21 | buf := make([]byte, 1) |
| 22 | for { |
| 23 | n, err := os.Stdin.Read(buf) |
| 24 | if n > 0 { |
| 25 | if buf[0] == '\n' { |
| 26 | break |
| 27 | } |
| 28 | if buf[0] != '\r' { |
| 29 | line = append(line, buf[0]) |
| 30 | } |
| 31 | } |
| 32 | if err != nil { |
| 33 | if len(line) > 0 { |
| 34 | break |
| 35 | } |
| 36 | return false, fmt.Errorf("failed to prompt: %v", err) |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | // normalize the answer |
| 41 | ans := strings.ToLower(strings.TrimSpace(string(line))) |
| 42 | |
| 43 | // return the appropriate response |
| 44 | switch ans { |
| 45 | case "y": |
| 46 | return true, nil |
| 47 | case "": |
| 48 | return def, nil |
| 49 | default: |
| 50 | return false, nil |
| 51 | } |
| 52 | } |
no outgoing calls