LestaD/os.js

var os = require("os");

// Declare variables instead function calls
var Platform = os.platform();
var Release = os.release().split(".");
var Architecture = os.arch().replace("x", "");
var OSMap = require("../lib/map");


// Structure of response
var Tags = {
  os: "",
  version: {
    major: -1,
    minor: -1,
    codename: ""
  },
  arch: Number(Architecture.replace("x"))
};


// Set variables from `set` object to base version
function applySet(from, to) {
  if (typeof from.set !== "undefined") {
    if (from.set.major) {
      to.major = from.set.major;
    }
    if (from.set.minor) {
      to.minor = from.set.minor;
    }
    if (from.set.codename) {
      to.codename = from.set.codename;
    }
  }
  return to;
}


// Select basics info about versions from map
function selectFromMap(platform, major, minor) {
  var osc = OSMap["os=" + platform] || {};
  var version = {
    major: -1,
    minor: -1,
    codename: ""
  };
  // Apply current version set
  version = applySet(osc, version);

  // Apply by major define
  var curMajor = osc["major=" + major];
  if (typeof curMajor !== "undefined") {
    version = applySet(curMajor, version);

    // Apply by minor version
    var curMinor = curMajor["minor=" + minor];
    if (typeof curMinor !== "undefined") {
      version = applySet(curMinor, version);
    }
  }
  return version;
}

// Set concrete version to response
Tags.version = selectFromMap(Platform, Release[0], Release[1]);

// Select platform
switch(Platform) {
  case "darwin": Tags.os = "OS X"; break;
  case "linux": Tags.os = "Linux"; break;
  case "win": Tags.os = "Windows"; break;
}

Object.defineProperty(Tags.version, "toString", {
  value: function(){
    "use strict";
    return this.major + "." + this.minor;
  }
});

module.exports = Tags;