ENH: add return and break support to cmake, also change basic command invocation signature to be able to return extra informaiton via the cmExecutionStatus class

Source/cmReturnCommand.h

@@ -0,0 +1,82 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmReturnCommand_h
+#define cmReturnCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmReturnCommand
+ * \brief Return from a directory or function
+ *
+ * cmReturnCommand returns from a directory or function
+ */
+class cmReturnCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmReturnCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args,
+                           cmExecutionStatus &status);
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() {return "return";}
+  
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Return from a directory or function.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "  return()\n"
+      "Returns from a directory or function. When this command is "
+      "encountered, it caused process of the current function or "
+      "directory to stop and control is return to the caller of the "
+      "function, or the parent directory if any. Note that a macro "
+      "is not a function and does not handle return liek a function does.";
+    }
+  
+  cmTypeMacro(cmReturnCommand, cmCommand);
+};
+
+
+
+#endif