Adding pluginSplit and test case. pluginSplit consolidates a number o…

…f repeated code blocks.

cake/basics.php

@@ -212,6 +212,22 @@ function h($text, $charset = null) {
 		return htmlspecialchars($text, ENT_QUOTES, $charset);
 	}
 
+/**
+ * Splits a dot syntax plugin name into its plugin and classname.
+ * If $name does not have a dot, then index 0 will be null.
+ *
+ * Commonly used like `list($plugin, $name) = pluginSplit($name);
+ *
+ * @param string $name The name you want to plugin split.
+ * @return array Array with 2 indexes.  0 => plugin name, 1 => classname
+ */
+	function pluginSplit($name) {
+		if (strpos($name, '.') !== false) {
+			return explode('.', $name, 2);
+		}
+		return array(null, $name);
+	}
+
 /**
  * Returns an array of all the given parameters.
  *

cake/tests/cases/basics.test.php

@@ -764,5 +764,18 @@ function testIfe() {
 		$this->assertEqual(ife(0, 'a', 'b'), 'b');
 		$this->assertEqual(ife(array(), 'a', 'b'), 'b');
 	}
+
+/**
+ * test pluginSplit
+ *
+ * @return void
+ */
+	function testPluginSplit() {
+		$result = pluginSplit('Something.else');
+		$this->assertEqual($result, array('Something', 'else'));
+
+		$result = pluginSplit('Somethingelse');
+		$this->assertEqual($result, array(null, 'Somethingelse'));
+	}
 }
 ?>