| 1 | module goto_prompt_module |
| 2 | use iso_fortran_env, only: input_unit, output_unit |
| 3 | use terminal_io_module |
| 4 | use editor_state_module, only: editor_state_t, cursor_t |
| 5 | use text_buffer_module |
| 6 | implicit none |
| 7 | private |
| 8 | |
| 9 | public :: show_goto_prompt |
| 10 | |
| 11 | contains |
| 12 | |
| 13 | subroutine show_goto_prompt(editor, buffer) |
| 14 | type(editor_state_t), intent(inout) :: editor |
| 15 | type(buffer_t), intent(inout) :: buffer |
| 16 | character(len=256) :: input_buffer |
| 17 | character(len=32) :: prompt |
| 18 | integer :: input_pos, ch |
| 19 | integer :: target_line, target_col |
| 20 | integer :: line_count |
| 21 | |
| 22 | ! Initialize |
| 23 | input_buffer = '' |
| 24 | input_pos = 0 |
| 25 | prompt = 'Go to (line:col): ' |
| 26 | |
| 27 | ! Get current position for default |
| 28 | target_line = editor%cursors(editor%active_cursor)%line |
| 29 | target_col = editor%cursors(editor%active_cursor)%column |
| 30 | line_count = buffer_get_line_count(buffer) |
| 31 | |
| 32 | ! Display prompt at bottom of screen |
| 33 | call terminal_move_cursor(editor%screen_rows, 1) |
| 34 | call terminal_write(prompt) |
| 35 | call terminal_show_cursor() |
| 36 | |
| 37 | ! Input loop |
| 38 | do |
| 39 | ch = terminal_read_char() |
| 40 | |
| 41 | if (ch == -1) then |
| 42 | ! No input, continue |
| 43 | cycle |
| 44 | else if (ch == 27) then ! ESC - cancel |
| 45 | exit |
| 46 | else if (ch == 10 .or. ch == 13) then ! Enter - accept |
| 47 | if (input_pos > 0) then |
| 48 | call parse_goto_input(input_buffer(1:input_pos), target_line, target_col) |
| 49 | end if |
| 50 | |
| 51 | ! Validate and apply |
| 52 | if (target_line >= 1 .and. target_line <= line_count) then |
| 53 | editor%cursors(editor%active_cursor)%line = target_line |
| 54 | editor%cursors(editor%active_cursor)%column = max(1, target_col) |
| 55 | editor%cursors(editor%active_cursor)%desired_column = & |
| 56 | editor%cursors(editor%active_cursor)%column |
| 57 | |
| 58 | ! Clear any selection |
| 59 | editor%cursors(editor%active_cursor)%has_selection = .false. |
| 60 | |
| 61 | ! Update viewport to center on target |
| 62 | call center_viewport_on_cursor(editor) |
| 63 | end if |
| 64 | exit |
| 65 | else if (ch == 127 .or. ch == 8) then ! Backspace |
| 66 | if (input_pos > 0) then |
| 67 | input_pos = input_pos - 1 |
| 68 | ! Redraw prompt and input |
| 69 | call terminal_move_cursor(editor%screen_rows, 1) |
| 70 | call terminal_write(prompt // input_buffer(1:input_pos) // ' ') |
| 71 | call terminal_move_cursor(editor%screen_rows, len(prompt) + input_pos + 1) |
| 72 | end if |
| 73 | else if (ch >= 32 .and. ch <= 126) then ! Printable characters |
| 74 | if (input_pos < 256) then |
| 75 | input_pos = input_pos + 1 |
| 76 | input_buffer(input_pos:input_pos) = char(ch) |
| 77 | call terminal_write(char(ch)) |
| 78 | end if |
| 79 | end if |
| 80 | end do |
| 81 | |
| 82 | ! Clean up - hide cursor and clear prompt line |
| 83 | call terminal_hide_cursor() |
| 84 | call terminal_move_cursor(editor%screen_rows, 1) |
| 85 | call terminal_write(repeat(' ', editor%screen_cols)) |
| 86 | end subroutine show_goto_prompt |
| 87 | |
| 88 | subroutine parse_goto_input(input, line, col) |
| 89 | character(len=*), intent(in) :: input |
| 90 | integer, intent(out) :: line, col |
| 91 | integer :: colon_pos, ios |
| 92 | character(len=:), allocatable :: line_str, col_str |
| 93 | |
| 94 | ! Default to column 1 |
| 95 | col = 1 |
| 96 | |
| 97 | ! Find colon separator |
| 98 | colon_pos = index(input, ':') |
| 99 | |
| 100 | if (colon_pos > 0) then |
| 101 | ! Parse line:column format |
| 102 | line_str = input(1:colon_pos-1) |
| 103 | col_str = input(colon_pos+1:) |
| 104 | |
| 105 | ! Parse line number |
| 106 | read(line_str, '(i10)', iostat=ios) line |
| 107 | if (ios /= 0) line = 1 |
| 108 | |
| 109 | ! Parse column number if present |
| 110 | if (len_trim(col_str) > 0) then |
| 111 | read(col_str, '(i10)', iostat=ios) col |
| 112 | if (ios /= 0) col = 1 |
| 113 | end if |
| 114 | else |
| 115 | ! Just a line number |
| 116 | read(input, '(i10)', iostat=ios) line |
| 117 | if (ios /= 0) line = 1 |
| 118 | end if |
| 119 | |
| 120 | ! Ensure positive values |
| 121 | line = max(1, line) |
| 122 | col = max(1, col) |
| 123 | end subroutine parse_goto_input |
| 124 | |
| 125 | subroutine center_viewport_on_cursor(editor) |
| 126 | type(editor_state_t), intent(inout) :: editor |
| 127 | integer :: cursor_line |
| 128 | integer :: viewport_height |
| 129 | |
| 130 | cursor_line = editor%cursors(editor%active_cursor)%line |
| 131 | viewport_height = editor%screen_rows - 2 ! Account for status bar |
| 132 | |
| 133 | ! Center the cursor in the viewport |
| 134 | editor%viewport_line = max(1, cursor_line - viewport_height / 2) |
| 135 | end subroutine center_viewport_on_cursor |
| 136 | |
| 137 | end module goto_prompt_module |