| 1 | module text_prompt_module |
| 2 | use iso_fortran_env, only: int32 |
| 3 | use terminal_io_module |
| 4 | implicit none |
| 5 | private |
| 6 | |
| 7 | public :: show_text_prompt, show_yes_no_prompt |
| 8 | |
| 9 | contains |
| 10 | |
| 11 | subroutine show_text_prompt(prompt_text, input_text, cancelled, screen_rows) |
| 12 | character(len=*), intent(in) :: prompt_text |
| 13 | character(len=*), intent(out) :: input_text |
| 14 | logical, intent(out) :: cancelled |
| 15 | integer(int32), intent(in) :: screen_rows |
| 16 | character(len=512) :: input_buffer |
| 17 | integer :: input_pos, ch |
| 18 | |
| 19 | ! Initialize |
| 20 | input_buffer = '' |
| 21 | input_pos = 0 |
| 22 | cancelled = .false. |
| 23 | |
| 24 | ! Display prompt at bottom of screen |
| 25 | call terminal_move_cursor(screen_rows, 1) |
| 26 | ! Use ANSI escape sequence to clear line (more reliable than spaces) |
| 27 | call terminal_write(achar(27) // '[2K') ! Clear entire line |
| 28 | call terminal_move_cursor(screen_rows, 1) |
| 29 | call terminal_write(trim(prompt_text)) |
| 30 | call terminal_show_cursor() |
| 31 | |
| 32 | ! Input loop |
| 33 | do |
| 34 | ch = terminal_read_char() |
| 35 | |
| 36 | if (ch == -1) then |
| 37 | ! No input, continue |
| 38 | cycle |
| 39 | else if (ch == 27) then ! ESC |
| 40 | ! Cancel |
| 41 | cancelled = .true. |
| 42 | input_text = '' |
| 43 | exit |
| 44 | else if (ch == 10 .or. ch == 13) then ! Enter |
| 45 | ! Accept input |
| 46 | input_text = input_buffer(1:input_pos) |
| 47 | exit |
| 48 | else if (ch == 127 .or. ch == 8) then ! Backspace/Delete |
| 49 | if (input_pos > 0) then |
| 50 | input_pos = input_pos - 1 |
| 51 | ! Redraw line |
| 52 | call terminal_move_cursor(screen_rows, 1) |
| 53 | call terminal_write(achar(27) // '[2K') ! Clear entire line |
| 54 | call terminal_move_cursor(screen_rows, 1) |
| 55 | call terminal_write(trim(prompt_text) // input_buffer(1:input_pos)) |
| 56 | end if |
| 57 | else if (ch >= 32 .and. ch <= 126) then ! Printable characters |
| 58 | if (input_pos < len(input_buffer)) then |
| 59 | input_pos = input_pos + 1 |
| 60 | input_buffer(input_pos:input_pos) = achar(ch) |
| 61 | ! Write character |
| 62 | call terminal_write(achar(ch)) |
| 63 | end if |
| 64 | end if |
| 65 | end do |
| 66 | |
| 67 | call terminal_hide_cursor() |
| 68 | end subroutine show_text_prompt |
| 69 | |
| 70 | subroutine show_yes_no_prompt(prompt_text, answer, cancelled, screen_rows) |
| 71 | character(len=*), intent(in) :: prompt_text |
| 72 | logical, intent(out) :: answer |
| 73 | logical, intent(out) :: cancelled |
| 74 | integer(int32), intent(in) :: screen_rows |
| 75 | integer :: ch |
| 76 | |
| 77 | ! Initialize |
| 78 | cancelled = .false. |
| 79 | answer = .false. |
| 80 | |
| 81 | ! Display prompt at bottom of screen |
| 82 | call terminal_move_cursor(screen_rows, 1) |
| 83 | call terminal_write(achar(27) // '[2K') ! Clear entire line |
| 84 | call terminal_move_cursor(screen_rows, 1) |
| 85 | call terminal_write(trim(prompt_text)) |
| 86 | call terminal_show_cursor() |
| 87 | |
| 88 | ! Input loop - wait for single y/n/esc keypress |
| 89 | do |
| 90 | ch = terminal_read_char() |
| 91 | |
| 92 | if (ch == -1) then |
| 93 | ! No input, continue |
| 94 | cycle |
| 95 | else if (ch == 27) then ! ESC |
| 96 | ! Cancel |
| 97 | cancelled = .true. |
| 98 | exit |
| 99 | else if (ch == 121 .or. ch == 89) then ! 'y' or 'Y' |
| 100 | ! Yes |
| 101 | answer = .true. |
| 102 | exit |
| 103 | else if (ch == 110 .or. ch == 78) then ! 'n' or 'N' |
| 104 | ! No |
| 105 | answer = .false. |
| 106 | exit |
| 107 | end if |
| 108 | ! Ignore other characters, keep waiting for y/n/esc |
| 109 | end do |
| 110 | |
| 111 | call terminal_hide_cursor() |
| 112 | end subroutine show_yes_no_prompt |
| 113 | |
| 114 | end module text_prompt_module |
| 115 |