npr-one/lib/ui.js

A NPR One command line client

'use strict';

const EventEmitter = require('events'),
      keypress = require('keypress');

class UI extends EventEmitter {

  constructor(config) {

    super();

    this.touchThreshold = config.touchThreshold || 24;
    this.releaseThreshold = config.releaseThreshold || 12;

    if(process.platform == 'linux' && process.arch == 'arm')
      this.mprInit();

    this.keyboardInit();

  }

  keyboardInit() {

    keypress(process.stdin);

    process.stdin.on('keypress', (ch, key) => {
      if(key && key.name == 'right') this.skip();
      if(key && key.name == 'left') this.rewind();
      if(key && key.name == 'up') this.volumeup();
      if(key && key.name == 'down') this.volumedown();
      if(key && key.name == 'space') this.pause();
      if(key && key.name == 'i') this.interesting();
      if(key && key.ctrl && key.name == 'c') process.exit();
    });

    process.stdin.setRawMode(true);
    process.stdin.resume();

  }

  mprInit() {

    const MPR121 = require('adafruit-mpr121'),
          mpr121 = new MPR121(0x5A, 1);

    mpr121.setThresholds(this.touchThreshold, this.releaseThreshold);

    mpr121.on('touch', (pin) => {
      if(pin === 0) this.skip();
      if(pin === 1) this.pause();;
      if(pin === 2) this.rewind();
      if(pin === 3) this.interesting();
      if(pin === 4) this.volumeup();
      if(pin === 5) this.volumedown();
    });

  }

  skip(pressed) {
    this.emit('skip');
  }

  pause(pressed) {
    this.emit('pause');
  }

  rewind(pressed) {
    this.emit('rewind');
  }

  interesting(pressed) {
    this.emit('interesting');
  }

  volumeup(pressed) {
    this.emit('volumeup');
  }

  volumedown(pressed) {
    this.emit('volumedown');
  }

}

exports = module.exports = UI;