ps-find/index.js

Find processes with ease

'use strict'

var spawn = require('child_process').spawn;

// ps aux output mapping
var MAPPING = {
  pid: 0,
  name: 1
};

var find = function (input, callback) {
  var pgrep = spawn('pgrep', ['-afl', input]);

  pgrep.stdout.on('data', function (data) {
    var result = parse(data);
    post(callback, null, result);
  });

  pgrep.stderr.on('data', function (data) {
    post(callback, data);
  });

  pgrep.on('close', function (code) {
    if (code !== 0) {

      // Nothing found
      post(callback, new Error('No process found.'));
    }
  });
};

var post = function (callback, error, result) {
  result = result || [];

  if (typeof callback === 'function') {
    callback(error, result);
  }
};

var parse = function (input) {
  var result = [],
  data = input.toString().split('\n'),
  proc = null;

  for (var i = 0, length = data.length; i < length; i++) {
    if (data[i].length > 0) {
      data[i] = data[i].replace(/  +/g, ' ');
      proc = parseRow(data[i]);
      result.push(proc);
    }
  }

  return result;
};

var parseRow = function (input) {
  var data = input.split(' ');

  return {
    pid: parseInt(data[MAPPING.pid]),
    name: data[MAPPING.name]
  };
};

module.exports.find = find;