pick static method

String? pick(Command command, String commandPath)

Shows an interactive menu to select a switch case from the given command. Returns the selected switch name or null if cancelled.

Implementation

static String? pick(Command command, String commandPath) {
  if (command.switches.isEmpty) {
    return null;
  }

  final switchNames = command.switches.keys.toList();
  int selectedIndex = 0; // Currently selected option (0-based)

  // Calculate max switch name length for alignment
  int maxSwitchNameLength = 0;
  for (final switchName in switchNames) {
    if (switchName.length > maxSwitchNameLength) {
      maxSwitchNameLength = switchName.length;
    }
  }

  // Helper function to display the menu
  void displayMenu() {
    print('');
    print('Select an option for ${colors.blue}$commandPath${colors.reset}:');
    print('');

    for (var i = 0; i < switchNames.length; i++) {
      final switchName = switchNames[i];
      final switchInfo = command.getSwitchInfo(switchName);
      final number = i + 1;
      final isSelected = i == selectedIndex;
      final checkMark = isSelected ? ' ✓' : '  '; // Always 2 chars width

      // Pad switch name to align everything
      final paddedSwitchName = switchName.padRight(maxSwitchNameLength);

      // Build display string
      String display = isSelected
          ? '    ${colors.green}$number. $paddedSwitchName$checkMark${colors.reset}'
          : '    $number. $paddedSwitchName$checkMark';

      // Add flags if available
      if (switchInfo != null && switchInfo.flags != null && switchInfo.flags!.isNotEmpty) {
        final flagsStr = switchInfo.aliases.map((a) => '-$a').join(', ');
        display += ' ${colors.gray}($flagsStr)${colors.reset}';
      }

      // Add description if available
      if (switchInfo != null && switchInfo.description != null) {
        display += ' ${colors.gray}- ${switchInfo.description}${colors.reset}';
      }

      print(display);
    }

    print('');
    print('${colors.gray}Press number (1-${switchNames.length}) or press Esc to cancel:${colors.reset}');
  }

  // Display initial menu
  displayMenu();

  // Enable raw mode to detect arrow keys and ESC
  stdin.echoMode = false;
  stdin.lineMode = false;

  while (true) {
    final charCode = stdin.readByteSync();

    // ESC key (27) - check if it's part of arrow key sequence
    if (charCode == 27) {
      // Sleep briefly to see if more bytes are coming (for arrow keys)
      sleep(Duration(milliseconds: 10));

      // Check if there's more input (arrow keys send ESC[A/B/C/D)
      if (stdin.hasTerminal) {
        try {
          // Try to read next byte without blocking
          final bytesAvailable = stdin.readByteSync();

          if (bytesAvailable == 91) {
            // '[' character - this is an arrow key sequence
            final arrowChar = stdin.readByteSync();

            // Arrow Up (65 = 'A')
            if (arrowChar == 65) {
              selectedIndex = (selectedIndex - 1 + switchNames.length) % switchNames.length;
              // Clear screen and redraw
              _clearScreen(switchNames.length + 5);
              displayMenu();
              continue;
            }

            // Arrow Down (66 = 'B')
            if (arrowChar == 66) {
              selectedIndex = (selectedIndex + 1) % switchNames.length;
              // Clear screen and redraw
              _clearScreen(switchNames.length + 5);
              displayMenu();
              continue;
            }
          }
        } catch (e) {
          // No more bytes available - it's just ESC key
        }
      }

      // Just ESC key - cancel
      stdin.echoMode = true;
      stdin.lineMode = true;
      print('\n${colors.yellow}Cancelled${colors.reset}');
      return null;
    }

    // Enter key (10 or 13) - execute selected option
    if (charCode == 10 || charCode == 13) {
      stdin.echoMode = true;
      stdin.lineMode = true;
      print('');
      return switchNames[selectedIndex];
    }

    // Number keys (49-57 correspond to '1'-'9')
    if (charCode >= 49 && charCode <= 57) {
      final number = charCode - 48; // Convert to 1-9
      if (number >= 1 && number <= switchNames.length) {
        stdin.echoMode = true;
        stdin.lineMode = true;
        print('');
        return switchNames[number - 1];
      }
    }
  }
}