Adding first draft option

src/cli.js

@@ -1,14 +1,16 @@
 'use strict';
 
-var cocktail = require('cocktail');
+var cocktail   = require('cocktail');
 
 var senchaCmd  = require('./cmd/sencha'); 
 var listCmd    = require('./cmd/list');
+var useCmd     = require('./cmd/use');
 var noOpCmd    = require('./cmd/noop.js');
 
 //TODO: Review this, maybe using nopts
 var CMD_OPTIONS = {
-    'use'  : [noOpCmd],
+    'noop' : [noOpCmd],
+    'use'  : [useCmd],
     'list' : [listCmd]
 };
 

src/cmd/use.js

@@ -0,0 +1,42 @@
+'use strict';
+
+var cocktail        = require('cocktail');
+var path            = require('path');
+var fs              = require('fs');
+
+var withSpawn       = require('./withSpawn');
+var withCmdVersions = require('./withCmdVersions');
+
+cocktail.mix({
+    '@exports': module,
+    '@as': 'class',
+
+    '@requires': [
+        'getArgs'
+    ],
+
+    '@traits': [
+        withSpawn,
+        withCmdVersions
+    ],
+
+    resolveCmd: function () {
+        var fromCfg = this.retrieveFromArgs(),
+            cmd = 'sencha';
+
+        if (fromCfg && fs.existsSync(fromCfg)) {
+            cmd = fromCfg;
+        }
+
+        return cmd;
+    },
+
+    retrieveFromArgs: function () {
+        var args    = this.getArgs().splice(0,2),
+            bin     = this.retrieveCmdBinPath();
+
+        return path.join(bin, args.pop(), 'sencha');
+
+    }
+
+});