diff --git a/examples/contexts.php b/examples/contexts.php
new file mode 100644
index 0000000..424567c
--- /dev/null
+++ b/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();
+
diff --git a/examples/simple.php b/examples/simple.php
index acd1d07..3fbdf4a 100644
--- a/examples/simple.php
+++ b/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()
diff --git a/lib/Command.php b/lib/Command.php
index ce036fe..6de03e0 100644
--- a/lib/Command.php
+++ b/lib/Command.php
@@ -23,7 +23,8 @@ abstract class Command
         $this->shell->writeln($str);
     }
 
-    abstract public function getName();
+    public function getName()
+    {}
 
     public function getDescription()
     {}
@@ -31,8 +32,8 @@ abstract class Command
     public function getHelp()
     {}
 
-    public function run(array $args)
+    public function __invoke(...$args)
     {
-        call_user_func_array([$this,"execute"], $args);
+        call_user_func([$this,"execute"], ...$args);
     }
 }
diff --git a/lib/Context.php b/lib/Context.php
new file mode 100644
index 0000000..ab7d0ce
--- /dev/null
+++ b/lib/Context.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace NoccyLabs\Shell;
+
+class Context
+{
+    protected $name;
+
+    protected $commands = [];
+
+    protected $data = [];
+
+
+    public function __construct($name=null, array $data=[])
+    {
+        $this->name = $name;
+        $this->data = $data;
+        $this->configure();
+    }
+
+    protected function configure()
+    {
+        // Override this to do setup stuff
+    }
+
+    public function addCommand($command, callable $handler)
+    {
+        $this->commands[$command] = $handler;
+    }
+
+    public function addCommands(array $commands)
+    {
+        foreach ($commands as $command=>$handler) {
+            // Make it easier to connect commands direct to local functions
+            if (is_string($handler) && is_callable([$this,$handler])) {
+                $handler = [ $this,$handler ];
+            }
+            // Add the command to the command list
+            $this->addCommand($handler);
+        }
+    }
+
+    public function hasCommand($command)
+    {
+        return array_key_exists($command, $this->commands);
+    }
+
+    public function getCommand($command)
+    {
+        return $this->commands[$command];
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function __get($key)
+    {
+        if (!array_key_exists($key,$this->data)) {
+            return false;
+        }
+        return $this->data[$key];
+    }
+
+    public function __set($key,$value)
+    {
+        $this->data[$key] = $value;
+    }
+
+    public function __isset($key)
+    {
+        return array_key_exists($key);
+    }
+
+    public function __unset($key)
+    {
+        unset($this->data[$key]);
+    }
+
+    public function getData()
+    {
+        return $this->data;
+    }
+
+}
\ No newline at end of file
diff --git a/lib/Exception/BadCommandException.php b/lib/Exception/BadCommandException.php
new file mode 100644
index 0000000..f6c2922
--- /dev/null
+++ b/lib/Exception/BadCommandException.php
@@ -0,0 +1,6 @@
+<?php
+
+namespace NoccyLabs\Shell\Exception;
+
+class BadCommandException extends ShellException
+{}
\ No newline at end of file
diff --git a/lib/Exception/ShellException.php b/lib/Exception/ShellException.php
new file mode 100644
index 0000000..4a85aa5
--- /dev/null
+++ b/lib/Exception/ShellException.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace NoccyLabs\Shell\Exception;
+
+use Exception;
+
+class ShellException extends Exception
+{}
\ No newline at end of file
diff --git a/lib/LineRead.php b/lib/LineRead.php
index 674933a..bf991f6 100644
--- a/lib/LineRead.php
+++ b/lib/LineRead.php
@@ -34,7 +34,7 @@ class LineRead
     {
         stream_set_blocking(STDIN, false);
         $this->sttyOld = trim(exec('stty -g'));
-        exec('stty raw -echo'); // isig');
+        exec('stty raw -echo opost onlret'); // isig');
     }
     
     public function __destruct()
@@ -63,11 +63,9 @@ class LineRead
         $buffer = $this->buffer;
         $cursor = strlen($this->prompt) + 1 + $this->posCursor - $this->posScroll;
         
-        $promptStyle = $this->styleToAnsi($this->promptStyle);
-        $commandStyle = $this->styleToAnsi($this->commandStyle);
         $endStyle = "\e[0m";
         
-        fprintf(STDOUT, "\r\e[2K{$promptStyle}%s{$commandStyle}%s\e[%dG{$endStyle}", $prompt, $buffer, $cursor);
+        fprintf(STDOUT, "\r\e[2K%s%s\e[%dG{$endStyle}", ($this->promptStyle)($prompt), ($this->commandStyle)($buffer), $cursor);
     }
     
     protected function styleToAnsi($style)
@@ -160,12 +158,14 @@ class LineRead
         $this->commandStyle = $style;
     }
 
-    public function setPrompt($prompt, $style=null)
+    public function setPromptText($prompt)
     {
         $this->prompt = $prompt;
-        if ($style) {
-            $this->promptStyle = $style;
-        }
+    }
+
+    public function setPromptStyle($style)
+    {
+        $this->promptStyle = $style;
     }
 
 }
diff --git a/lib/Shell.php b/lib/Shell.php
index 3d6ea81..03ab2f4 100644
--- a/lib/Shell.php
+++ b/lib/Shell.php
@@ -4,58 +4,234 @@ namespace NoccyLabs\Shell;
 
 use NoccyLabs\Shell\LineRead;
 
-abstract class Shell
+class Shell
 {
-    protected $prompt;
+    const EV_PROMPT = "prompt";
+    const EV_COMMAND = "command";
 
-    protected $promptStyle;
-    
-    protected $commandStyle;
+    protected $lineReader = null;
 
-    public function __construct(array $config=[])
+    protected $context = null;
+
+    protected $contextStack = [];
+
+    protected $listeners = [];
+
+    public function __construct()
     {
-        $this->configure($config);
+        $this->configure();
     }
 
-    abstract protected function configure(array $config);
-
-    public function addCommand($command, callable $handler=null)
+    protected function configure()
     {
-        if (!$handler) {
-            if (!($command instanceof Command)) {
-                throw new \RuntimeException("Handler is not callable nor a Command");
-            }
-            $command->setShell($this);
-            $this->commands[$command->getName()] = $command;
+
+    }
+
+    /**
+     * Push a new primary context, saving the previous contexts on a stack.
+     *
+     * @param Context $context
+     */
+    public function pushContext(Context $context)
+    {
+        if ($this->context) {
+            array_unshift($this->contextStack, $this->context);
+        }
+        $this->context = $context;
+        $this->dispatchEvent("context.update", [ "context"=>$this->context ]);
+    }
+
+    /**
+     * Pop the current context.
+     *
+     * @return Context
+     */
+    public function popContext()
+    {
+        $previous = $this->context;
+        if (count($this->contextStack)>0) {
+            $this->context = array_shift($this->contextStack);
         } else {
-            $this->commands[$command] = $handler;
+            $this->context = null;
+        }
+        $this->dispatchEvent("context.update", [ "context"=>$this->context ]);
+        return $previous;
+    }
+
+    public function getContextPath($separator=":")
+    {
+        $stack = [ $this->context->getName() ];
+        foreach ($this->contextStack as $context) {
+            $stack[] = $context->getName();
+        }
+        $stack = array_reverse($stack);
+        return join($separator,$stack);
+    }
+
+    public function createContext()
+    {
+        $context = new Context();
+        $this->pushContext($context);
+        return $context;
+    }
+
+    /**
+     * Add a handler to be called when an event fires.
+     *
+     * @param string $event
+     * @param callable $handler
+     */ 
+    public function addListener($event, callable $handler)
+    {
+        if (!array_key_exists($event,$this->listeners)) {
+            $this->listeners[$event] = [];
+        }
+        $this->listeners[$event][] = $handler;
+    }
+
+    /**
+     * Invoke event handlers for event.
+     *
+     * @param string $event
+     * @param callable $handler
+     */
+    protected function dispatchEvent($event, array $data=[])
+    {
+        if (!array_key_exists($event,$this->listeners)) {
+            return;
+        }
+        foreach ($this->listeners[$event] as $handler) {
+            call_user_func($handler, (object)$data, $this);
         }
     }
 
-    public function execute($command)
+    /**
+     * Add a callback to be called at a regular interval during the update phase.
+     * Adding timers with a low interval (less than 200 i.e. 0.2s) may have an
+     * impact on performance.
+     *
+     * @param int $interval Interval in ms
+     * @param callable $handler The handler
+     * @param array $userdata Data to be passed to the handler
+     * @return Timer 
+     */
+    public function addTimer($interval, callable $handler, array $userdata=[])
     {
-        if (is_array($command)) {
-            foreach ($command as $cmd) {
-                $this->execute($cmd);
+
+    }
+
+    /**
+     * Remove a created timer.
+     *
+     * @param Timer $timer
+     */
+    public function removeTimer(Timer $timer)
+    {
+
+    }
+
+    public function setPrompt($text)
+    {
+        if (!$this->lineReader) {
+            return;
+        }
+        $this->lineReader->setPromptText($text);
+    }
+
+    /**
+     * Find a command and return a closure.
+     *
+     * @return callable The command
+     */ 
+    private function findCommand($command)
+    {
+        // Go over current context and walk through stack until finding command
+        foreach(array_merge([ $this->context ] , $this->contextStack) as $context) {
+            if ($context->hasCommand($command)) {
+                $handler = $context->getCommand($command);
+                break;
             }
+        }
+        if (empty($handler)) {
+            return false;
+        }
+
+        // Return closure
+        return function (...$args) use ($handler) {
+            return call_user_func($handler, ...$args);
+        };
+    }
+
+    /**
+     * Execute a command with arguments.
+     *
+     * @param string $command The command name to execute
+     * @param string.. $args Arguments
+     * @return mixed 
+     * @throws Exception\BadCommandExcception
+     */
+    public function executeCommand($command, ...$args)
+    {
+        if ($this->executeBuiltin($command, ...$args)) {
             return;
         }
 
-        $buffer = str_getcsv($command, " ", "\"", "\\");
-
-        if (count($buffer)>0) {
-            $this->onCommand($buffer);
+        // Call the handler if the command was found
+        if (($target = $this->findCommand($command))) {
+            $ret = $target(...$args);
+            if ($ret instanceof Context) {
+                $this->pushContext($ret);
+            }
+            return;
         }
-    }
-    
-    protected function onCommand($buffer)
-    {
-        $this->executeBuffer($buffer);
+        // Throw error if the command could not be found
+        throw new Exception\BadCommandException("Command {$command} not found");
     }
 
-    protected function executeBuffer(array $buffer)
+    public function executeBuiltin($command, ...$args)
     {
-        $commandName = array_shift($buffer);
+        switch ($command) {
+            case '.':
+                printf("context<%s>:\n", $this->context->getName());
+                echo "  ".join("\n  ",explode("\n",json_encode($this->context->getData(),JSON_PRETTY_PRINT)))."\n";
+                break;
+            case '..':
+                if (count($this->contextStack)>0)
+                    $this->popContext();
+                break;
+            case 'help':
+                echo
+                    "Built in commands:\n".
+                    "  .        Show current context\n".
+                    "  ..       Go to parent context\n".
+                    "  exit     Exit the shell\n";
+                break;
+            case 'exit':
+                $this->stop();
+                break;
+            default:
+                return false;
+        }        
+        return true;
+    }
+
+    /**
+     * Parse a string and execute the resulting command.
+     *
+     * @param string $command The string to parse
+     * @return mixed
+     */ 
+    public function executeBuffer(string $command)
+    {
+        $args = str_getcsv($command, " ", "\"", "\\");
+        $command = array_shift($args);
+
+        try {
+            $this->executeCommand($command, ...$args);
+        } catch (Exception\ShellException $e) {
+            echo "\e[31;91;1m{$e->getMessage()}\e[0m\n";
+        }
+        /*
         if (array_key_exists($commandName, $this->commands)) {
             $command = $this->commands[$commandName];
             if ($command instanceof Command) {
@@ -66,61 +242,52 @@ abstract class Shell
             return;
         }
         $this->writeln("Bad command: ".$commandName);
-    }
-
-    public function writeln($output)
-    {
-        echo "\r\e[K\e[0m".$output."\n";
-    }
-    
-    protected function onUpdate()
-    {
-    }
-
-    public function setPrompt($prompt)
-    {
-        $this->prompt = $prompt;
-    }
-
-    public function setPromptStyle($style)
-    {
-        $this->promptStyle = $style;
-    }
-    
-    public function setCommandStyle($style)
-    {
-        $this->commandStyle = $style;
+        */
     }
 
     public function run()
     {
-        $lineRead = new LineRead();
-        
-        $lineRead->setCommandStyle($this->commandStyle);
+        $this->lineReader = new LineRead();
+
+        $this->lineReader->setPromptText("shell>");
+        $this->lineReader->setPromptStyle(new Style(Style::BR_GREEN));
+        $this->lineReader->setCommandStyle(new Style(Style::GREEN));
 
         $this->running = true;
 
-        do {
-            $lineRead->setPrompt($this->prompt, $this->promptStyle);
-            $buffer = $lineRead->update();
+        $this->dispatchEvent("prompt", [ "context"=>$this->context ]);
+
+        while ($this->running) {
+            // Update the input stuff, sleep if nothing to do.
+            if (!($buffer = $this->lineReader->update())) {
+                usleep(10000);
+                continue;
+            }
+            // we get a ^C on ^C, so deal with the ^C.
             if ($buffer == "\x03") {
                 $this->stop();
                 continue;
             }
+            // Execute the buffer
             ob_start();
-            $this->onUpdate();
-            if ($buffer !== null) {
-                $this->execute($buffer);
-            }
-            $buf = ob_get_contents();
+            $this->executeBuffer($buffer);
+            $output = ob_get_contents();
             ob_end_clean();
-            if ($buf) {
-                $lineRead->erase();
-                echo str_replace("\n", "\r\n", rtrim($buf)."\n");
-                $lineRead->redraw();
+
+            if (trim($output)) {
+                $this->lineReader->erase();
+                echo rtrim($output)."\n";
+                $this->lineReader->redraw();
             }
-            usleep(10000);
-        } while ($this->running);
+
+            if (!$this->context) {
+                $this->stop();
+            }
+
+            $this->dispatchEvent("prompt", [ "context"=>$this->context ]);
+        }
+
+        $this->lineReader = null;
 
     }
 
diff --git a/lib/Style.php b/lib/Style.php
new file mode 100644
index 0000000..963e1d4
--- /dev/null
+++ b/lib/Style.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace NoccyLabs\Shell;
+
+class Style
+{
+    const NONE          = null;
+
+    const BLACK         = 0;
+    const RED           = 1;
+    const GREEN         = 2;
+    const YELLOW        = 3;
+    const BLUE          = 4;
+    const CYAN          = 5;
+    const MAGENTA       = 6;
+    const WHITE         = 7;
+    const GRAY          = 8;
+    const BR_RED        = 9;
+    const BR_GREEN      = 10;
+    const BR_YELLOW     = 11;
+    const BR_BLUE       = 12;
+    const BR_CYAN       = 13;
+    const BR_MAGENTA    = 14;
+    const BR_WHITE      = 15;
+
+    const A_INTENSE     = 1;
+    const A_UNDERLINE   = 4;
+    const A_INVERSE     = 7;
+
+    protected $fg = self::NONE;
+
+    protected $bg = self::NONE;
+
+    public function __construct($fg=self::NONE, $bg=self::NONE)
+    {
+        $this->fg = $fg;
+        $this->bg = $bg;
+    }
+
+    public function __invoke($string)
+    {
+        $pre = null; $post = null;
+        if ($this->fg !== self::NONE) {
+            $pre.= "\e[".(($this->fg > 7)?(90+($this->fg-8)):(30+$this->fg))."m"; 
+            $post.= "\e[39m";
+        }
+        if ($this->bg !== self::NONE) {
+            $pre.= "\e[".(($this->bg > 7)?(100+($this->bg-8)):(40+$this->bg))."m"; 
+            $post.= "\e[49m";
+        }
+        
+        return $pre . $string . $post;
+
+    }
+
+}
\ No newline at end of file