Implemented contexts, optimizations

examples/contexts.php

@@ -0,0 +1,27 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Shell\Shell;
+use NoccyLabs\Shell\Context;
+
+$shell = new Shell();
+$shell->addListener("prompt", function ($event, $shell) {
+    $name = $shell->getContextPath();
+    $shell->setPrompt("shell{$name}> ");
+});
+
+$root = new Context();
+$root->addCommand("test", function () {
+    echo "It works!\n";
+});
+$root->addCommand("context", function ($name) {
+    $context = new Context($name);
+    $context->name = $name;
+    return $context;
+});
+$shell->pushContext($root);
+
+
+$shell->run();
+

examples/simple.php

@@ -7,13 +7,9 @@ use NoccyLabs\Shell\Command;
 
 class MyCommand extends Command
 {
-    public function getName()
-    {
-        return "mycommand";
-    }
     public function execute()
     {
-        $this->writeln("Executing command");
+        echo "Executing command";
     }
 }
 
@@ -22,20 +18,19 @@ class MyShell extends Shell
 
     protected $seq = 0;
 
-    protected function configure(array $config)
+    protected function configure()
     {
-        $this->addCommand("hello", function () {
-            echo "world\n\rthis\n\ris\n\ra\ntest\n\r";
+        $context = $this->createContext();
+        $context->addCommand("hello", function () {
+            echo "world\nthis\nis\na\ntest\n";
         });
-        $this->addCommand(new MyCommand());
+        $context->addCommand("mycommand", new MyCommand());
         $this->updatePrompt();
     }
     
     protected function updatePrompt()
     {
         $this->setPrompt("test[{$this->seq}]: ");
-        $fg = ($this->seq % 7) + 1;
-        $this->setPromptStyle("3{$fg}");
     }
 
     protected function onUpdate()