Add debug tag that shows the assigned variables.

Environment.php

@@ -116,7 +116,8 @@ public function __construct(array $options = array())
 			'else' => 'Spoon\Template\Parser\ElseNode',
 			'endif' => 'Spoon\Template\Parser\EndIfNode',
 			'for' => 'Spoon\Template\Parser\ForNode',
-			'endfor' => 'Spoon\Template\Parser\EndForNode'
+			'endfor' => 'Spoon\Template\Parser\EndForNode',
+			'debug' => 'Spoon\Template\Parser\DebugNode'
 		);
 	}
 

Parser/DebugNode.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+* This file is part of Spoon Library.
+*
+* (c) Davy Hellemans <davy@spoon-library.com>
+*
+* For the full copyright and license information, please view the license
+* file that was distributed with this source code.
+*/
+
+namespace Spoon\Template\Parser;
+use Spoon\Template\TokenStream;
+use Spoon\Template\Environment;
+use Spoon\Template\Writer;
+
+/**
+ * Writes the debug node to the writer.
+ *
+ * @author Davy Hellemans <davy@spoon-library.com>
+ */
+class DebugNode extends Node
+{
+	/**
+	 * Writes the compiled PHP code to the writer object.
+	 *
+	 * @param Spoon\Template\Writer $writer
+	 */
+	public function compile(Writer $writer)
+	{
+		$writer->write("var_dump(\$context);\n", $this->line);
+	}
+}

README.md

@@ -162,4 +162,11 @@ These extra variables might come in handy for template designers. A brief exampl
 				</li>
 			{% endfor %}
 		</ul>
-	{% endif %}
+	{% endif %}
+
+##Debug
+You can see which variables are available in the current template by using the debug tag.
+This will use var_dump to show the contents of the assigned template variables.
+
+	{% debug %}
+

Tests/DebugNodeTest.php

@@ -0,0 +1,65 @@
+<?php
+
+/*
+* This file is part of Spoon Library.
+*
+* (c) Davy Hellemans <davy@spoon-library.com>
+*
+* For the full copyright and license information, please view the license
+* file that was distributed with this source code.
+*/
+
+namespace Spoon\Template\Tests;
+use Spoon\Template\Autoloader;
+use Spoon\Template\Writer;
+use Spoon\Template\TokenStream;
+use Spoon\Template\Token;
+use Spoon\Template\Environment;
+use Spoon\Template\Parser\DebugNode;
+
+require_once realpath(dirname(__FILE__) . '/../') . '/Autoloader.php';
+require_once 'PHPUnit/Framework/TestCase.php';
+
+class DebugNodeTest extends \PHPUnit_Framework_TestCase
+{
+	/**
+	 * @var Spoon\Template\Parser\DebugNode
+	 */
+	protected $node;
+
+	/**
+	 * @var Spoon\Template\Writer
+	 */
+	protected $writer;
+
+	public function setUp()
+	{
+		Autoloader::register();
+		$this->writer = new Writer();
+
+		// {endif}
+		$stream = new TokenStream(
+			array(
+				new Token(Token::BLOCK_START, null, 1),
+				new Token(Token::NAME, 'endif', 1),
+				new Token(Token::BLOCK_END, null, 1)
+			)
+		);
+		$this->node = new DebugNode($stream, new Environment());
+	}
+
+	public function tearDown()
+	{
+		$this->writer = null;
+		$this->node = null;
+	}
+
+	public function testCompile()
+	{
+		$this->node->compile($this->writer);
+		$this->assertEquals(
+			"// line 1\nvar_dump(\$context);\n",
+			$this->writer->getSource()
+		);
+	}
+}