Source/cmUnsetCommand.h

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmUnsetCommand.h,v $
   5   Language:  C++
   6   Date:      $Date: 2008-08-25 14:31:28 $
   7   Version:   $Revision: 1.1 $
   8
   9   Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  10   See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #ifndef cmUnsetCommand_h
  18 #define cmUnsetCommand_h
  19
  20 #include "cmCommand.h"
  21
  22 /** \class cmUnsetCommand
  23  * \brief Unset a CMAKE variable
  24  *
  25  * cmUnsetCommand unsets or removes a variable.
  26  */
  27 class cmUnsetCommand : public cmCommand
  28 {
  29 public:
  30   /**
  31    * This is a virtual constructor for the command.
  32    */
  33   virtual cmCommand* Clone()
  34     {
  35     return new cmUnsetCommand;
  36     }
  37
  38   /**
  39    * This is called when the command is first encountered in
  40    * the CMakeLists.txt file.
  41    */
  42   virtual bool InitialPass(std::vector<std::string> const& args,
  43                            cmExecutionStatus &status);
  44
  45   /**
  46    * This determines if the command is invoked when in script mode.
  47    */
  48   virtual bool IsScriptable() { return true; }
  49
  50   /**
  51    * The name of the command as specified in CMakeList.txt.
  52    */
  53   virtual const char* GetName() {return "unset";}
  54
  55   /**
  56    * Succinct documentation.
  57    */
  58   virtual const char* GetTerseDocumentation()
  59     {
  60     return "Unset a variable, cache variable, or environment variable.";
  61     }
  62
  63   /**
  64    * More documentation.
  65    */
  66   virtual const char* GetFullDocumentation()
  67     {
  68     return
  69       "  unset(<variable> [CACHE])\n"
  70       "Removes the specified variable causing it to become undefined.  "
  71       "If CACHE is present then the variable is removed from the cache "
  72       "instead of the current scope.\n"
  73       "<variable> can be an environment variable such as:\n"
  74       "  unset(ENV{LD_LIBRARY_PATH})\n"
  75       "in which case the variable will be removed from the current "
  76       "environment.";
  77     }
  78
  79   cmTypeMacro(cmUnsetCommand, cmCommand);
  80 };
  81
  82
  83
  84 #endif