readme.md

usage

$ node app $(i3 --get-socketpath) | lemonbar -B '#2b303b' -F '#eff1f5' -f 'Iosevka Medium:size=11' -f 'FontAwesome' -u 3 | node client

app.js

const net = require('net');
const exec = require('child_process').exec;
const os = require('os');

function run(cmd) {
  return new Promise((resolve, reject) => {
    exec(cmd, (err, stdout) => {
      if (err) {
        return reject(err);
      }
      resolve(stdout.toString());
    });
  });
}

function format(type, payload) {
  const data = payload ? JSON.stringify(payload) : '';
  const length = data ? data.length : 0;
  const msg = new Buffer(14 + length);
  msg.write('i3-ipc', 0);
  msg.writeUInt32LE(length, 6);
  msg.writeUInt32LE(type, 10);
  msg.write(data, 14);
  return msg;
}

function parse(msg) {
  const length = msg.readUInt32LE(6);
  return {
    type: msg.readUInt32LE(10),
    length,
    payload: JSON.parse(msg.slice(14, 14 + length)),
  };
}

let active = 0;
let name = '';

function print() {
  let str = ' %{+o}%{+u}%{B#b48ead}%{F#2b303b}%{U#debad7} ' + name + ' %{-o}%{-u}%{B-}%{U-}%{F-}%{c}';
  for (let i = 0; i < 10; i++) {
    str += i === active ? '◆' : '◇';
  }
  run('pactl list sinks | grep "Volume: fr" | awk \'{print $5}\' | head -1').then(vol => {

    const load = os.loadavg()[0];
    const total = os.totalmem();
    const used = total - os.freemem();
    const mem = used / total * 100;
    str += '%{r}';
    str += '%{+u}%{+o}%{B#bf616a}%{U#e29ca3}%{F#2b303b} load ' + load.toFixed(2) + ' %{B-}%{F-}%{-o}%{-u}  ';
    str += '%{+u}%{+o}%{B#d08770}%{U#e9a996}%{F#2b303b} mem ' + mem.toFixed(0) + '% %{B-}%{F-}%{-o}%{-u}  ';
    str += '%{+u}%{+o}%{A4:v+:}%{A5:v-:}%{B#a3be8c}%{U#bce996}%{F#2b303b} %{T2}\uf028%{T1} ';
    vol = +vol.match(/\d+/)[0] / 100;

    for (let i = 0; i < 10; i++) {
      if ((i + 1) / 10 < vol) str += '━';
      else if (i / 10 < vol) str += '╉';
      else str += '─';
    }
    str += ` ${(vol * 100).toFixed(0)}%`;
    return run(`date +'%Y-%m-%d %H:%M'`);
  }).then(date => {
    date = date.trim();
    str += ' %{B-}%{F-}%{-o}%{-u}%{A}%{A}';

    str += '  %{B#ebcb8b}%{F#2b303b} ' + date + ' %{B-}%{F-} '

    console.log(str);
  }).catch(e => console.error(e.stack));
}

const s = net.connect(process.argv[2], () => {
  s.write(format(1));
  s.write(format(2, ['workspace', 'window']));

  let buf = new Buffer(0);
  s.on('data', chunk => {
    buf = Buffer.concat([buf, chunk]);
    while (buf.length) {
      try {
        const msg = parse(buf);
        console.error(msg.type);
        buf = buf.slice(msg.length + 14);
        switch (msg.type) {
          case 2147483648:
          if (msg.payload.change !== 'focus') {
            continue;
          }
          active = msg.payload.current.num - 1;
          break;

          case 1:
          active = msg.payload.reduce((active, curr) => curr.visible ? curr.num - 1 : active, 0);
          break;

          case 2147483651:
          if (msg.payload.change !== 'focus') {
            continue;
          }
          name = msg.payload.container.name;
          break;
          default:
          console.error(msg);
          continue;
        }
        print();
      } catch (e) {
        console.error(e.stack);
        console.error(buf, buf.toString());
        buf = new Buffer(0);
      }
    }
  });
});

setInterval(print, 1000);

client.js

const exec = require('child_process').exec;

function run(cmd) {
  return new Promise((resolve, reject) => {
    exec(cmd, (err, stdout) => {
      if (err) {
        return reject(err);
      }
      resolve(stdout.toString());
    });
  });
}

process.stdin.on('data', chunk => {
  chunk = chunk.toString();
  if (chunk.match(/v\+/)) {
    console.log('v+');
    return run('pactl set-sink-volume 0 +3%');
  }
  if (chunk.match(/v-/)) {
    console.log('v-');
    return run('pactl set-sink-volume 0 -3%');
  }
});