Merge pull request #94 from manifoldjs/v0.3.1

V0.3.1

lib/common/version.js

@@ -0,0 +1,53 @@
+'use strict';
+
+var http = require('http'),
+    semver = require('semver'),
+    pkg = require('../../package.json');
+
+var getCurrentPackageVersion = function () {
+  return pkg.version;
+};
+
+var getCurrentPackageName = function () {
+  return pkg.name;
+};
+
+var getNpmPackageLatestVersion = function (packageName, callback) {
+  http.get('http://registry.npmjs.org/' + packageName + '/latest', function (res) {
+    var data = '';
+
+    res.on('data', function (chunk) {
+      data += chunk;
+    });
+
+    res.on('end', function () {
+      try {
+        var packageJson = JSON.parse(data);
+        callback(undefined, packageJson.version);
+      } catch (err) {
+        callback(err);
+      }
+    });
+  }).on('error', function (err) {
+    callback(err);
+  });
+};
+
+var checkForUpdate = function (callback) {
+  var name = getCurrentPackageName();
+  getNpmPackageLatestVersion(name, function (err, latestVersion) {
+    if (err) {
+      return callback && callback(err);
+    }
+
+    var currentVersion = getCurrentPackageVersion();
+    return callback && callback(undefined, semver.lt(currentVersion, latestVersion) ? latestVersion : undefined);
+  });
+};
+
+module.exports = {
+  getCurrentPackageName : getCurrentPackageName,
+  getCurrentPackageVersion: getCurrentPackageVersion,
+  getNpmPackageLatestVersion: getNpmPackageLatestVersion,
+  checkForUpdate : checkForUpdate
+};