procstat for android parser for adbkit

procstat.js

var _  = require('lodash');
var Promise = require('bluebird');
var readAll = require('adbkit').util.readAll;

var RE_COLSEP = /\ +/g;
var RE_CPU = /^cpu[0-9]*$/;

module.exports = function(client, serial) {
  return client.shell(serial, "cat /proc/stat")
  .then(readAll)
  .then(function (output) {
    return _.chain(output.toString('utf8').split("\n"))
    .without('', "\n", ' ')
    .transform(function (accum, line, key) {
      var cols = line.split(RE_COLSEP);
      var type = cols.shift();
      if (RE_CPU.test(type)) {
        accum.push({
          type:      type,
          user:      +cols[0] || 0,
          nice:      +cols[1] || 0,
          system:    +cols[2] || 0,
          idle:      +cols[3] || 0,
          iowait:    +cols[4] || 0,
          irq:       +cols[5] || 0,
          softirq:   +cols[6] || 0,
          steal:     +cols[7] || 0,
          guest:     +cols[8] || 0,
          guestnice: +cols[9] || 0,
          line:      {linenum: key, raw: line}
        });
      }
    }, []).value();
  });
};