print_gpio.dart

import "package:gpio/gpio.dart";
import "package:raspberry_pi/raspberry_pi.dart";
import "package:os/os.dart";

main() {
  PiMemoryMappedGPIO gpio = new PiMemoryMappedGPIO();

  var lines = [];
  for (var i = 0; i < 40; i += 2) {
    var mode1 = gpio.getMode(i);

    if (mode1 == Mode.input) {
      mode1 = "IN";
    } else {
      mode1 = "OUT";
    }

    var state1 = gpio.getPin(i);
    var mode2 = gpio.getMode(i + 1);

    if (mode2 == Mode.input) {
      mode2 = "IN";
    } else {
      mode2 = "OUT";
    }

    state1 = state1 ? 1 : 0;
    var state2 = gpio.getPin(i + 1);

    state2 = state2 ? 1 : 0;
    var out = alignString("Pin ${i}: ${state1} (${mode1})", 20);
    out += "| " + alignString("Pin ${i + 1}: ${state2} (${mode2})", 20);
    lines.add("| " + out + " |");
  }
  var clone = new List.from(lines);
  clone.sort();
  var len = clone.first.length;
  lines.insert(0, "-" * len);
  lines.add("-" * len);
  print(lines.join("\n"));
}

String alignString(String input, int len) {
  if (input.length > len) {
    throw new Exception("Input is longer than the allowed length.");
  }

  var pads = ((len - input.length) / 2).toInt();
  var result = (" " * pads) + input + (" " * pads);
  if (result.length < len) {
    result += " " *  (len - result.length);
  }
  return result;
}