Added an 'exceptions' method to the UpgradeShell.

This just replaces some of the basic cakeError() calls with
equivalent exceptions.

lib/Cake/Console/Command/UpgradeShell.php

@@ -516,6 +516,43 @@ public function components() {
 		$this->_filesRegexpUpdate($patterns);
 	}
 
+/**
+ * Replace cakeError with built-in exceptions.
+ * NOTE: this ignores calls where you've passed your own secondary parameters to cakeError().
+ * @return void
+ */
+	public function exceptions() {
+		$controllers = array_diff(App::path('controllers'), App::core('controllers'), array(APP));
+		$components = array_diff(App::path('components'), App::core('components'));
+
+		$this->_paths = array_merge($controllers, $components);
+
+		if (!empty($this->params['plugin'])) {
+			$pluginPath = App::pluginPath($this->params['plugin']);
+			$this->_paths = array(
+				$pluginPath . 'controllers' . DS,
+				$pluginPath . 'controllers' . DS . 'components' .DS,
+			);
+		}
+		$patterns = array(
+			array(
+				'$this->cakeError("error400") -> throw new BadRequestException()',
+				'/(\$this->cakeError\(["\']error400["\']\));/',
+				'throw new BadRequestException();'
+			),
+			array(
+				'$this->cakeError("error404") -> throw new NotFoundException()',
+				'/(\$this->cakeError\(["\']error404["\']\));/',
+				'throw new NotFoundException();'
+			),
+			array(
+				'$this->cakeError("error500") -> throw new InternalErrorException()',
+				'/(\$this->cakeError\(["\']error404["\']\));/',
+				'throw new InternalErrorException();'
+			),
+		);
+		$this->_filesRegexpUpdate($patterns);
+	}
 /**
  * Move application views files to where they now should be
  *
@@ -776,6 +813,10 @@ public function getOptionParser() {
 			->addSubcommand('components', array(
 				'help' => __d('cake_console', 'Update components to extend Component class.'),
 				'parser' => $subcommandParser
+			))
+			->addSubcommand('exceptions', array(
+				'help' => __d('cake_console', 'Replace use of cakeError with exceptions.'),
+				'parser' => $subcommandParser
 			));
 	}
 }