Adding command line helper (cli.js) and path helper (pathExt.js)

lib/cli.js

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+var nopt = require('nopt');
+
+/**
+ * Parse command line arguments
+ * @param {Array} args the command line arguments array
+ */
+exports.parseCommandLineArgs = function( args ) {
+  var options = {
+        'port':   Number
+      },
+      shorthand = {
+        'p':    '--port'
+      };
+
+  return nopt(options, shorthand, args);
+};

lib/pathExt.js

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+var path = require('path');
+
+/**
+ * Resolves a pathname to an absolute pathname.
+ * Handles ~/ references and environmental variables.
+ *
+ * Example:
+ *  Say you have the $DATA environmental variable set to 'app/config'
+ *
+ *  You call: resolve('~/$DATA/file.log')
+ *  Result would be something like: '/home/username/app/config/file.log'
+ */
+exports.resolve = function(pathname) {
+  if(typeof pathname !== 'string') {
+    pathname = '';
+  }
+
+  // resolve ~/
+  pathname = pathname.replace('~/', process.env.HOME + '/');
+
+  // resolve env variables
+  pathname = pathname.replace(/\$(\w*)/g, function() { 
+    var env = process.env[arguments[1]];
+    if(env) {
+      return env;
+    } else {
+      return '';
+    }
+  });
+
+  return path.resolve(pathname);
+};