CMake/Source/cmSetCommand.h

/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#ifndef cmSetCommand_h
#define cmSetCommand_h

#include "cmCommand.h"

/** \class cmSetCommand
 * \brief Set a CMAKE variable
 *
 * cmSetCommand sets a variable to a value with expansion.  
 */
class cmSetCommand : public cmCommand
{
public:
  /**
   * This is a virtual constructor for the command.
   */
  virtual cmCommand* Clone() 
    {
    return new cmSetCommand;
    }

  /**
   * 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() const { return true; }

  /**
   * The name of the command as specified in CMakeList.txt.
   */
  virtual const char* GetName() const {return "set";}
  
  /**
   * Succinct documentation.
   */
  virtual const char* GetTerseDocumentation() const
    {
    return "Set a CMAKE variable to a given value.";
    }
  
  /**
   * More documentation.
   */
  virtual const char* GetFullDocumentation() const
    {
    return
      "  set(<variable> <value>\n"
      "      [[CACHE <type> <docstring> [FORCE]] | PARENT_SCOPE])\n"
      "Within CMake sets <variable> to the value <value>.  <value> is expanded"
      "  before <variable> is set to it.  If CACHE is present, then the "
      "<variable> is put in the cache. <type> and <docstring> are then "
      "required. <type> is used by the CMake GUI to choose a widget with "
      "which the user sets a value.  The value for <type> may be one of\n"
      "  FILEPATH = File chooser dialog.\n"
      "  PATH     = Directory chooser dialog.\n"
      "  STRING   = Arbitrary string.\n"
      "  BOOL     = Boolean ON/OFF checkbox.\n"
      "  INTERNAL = No GUI entry (used for persistent variables).\n"
      "If <type> is INTERNAL, then the <value> is always written into the "
      "cache, replacing any values existing in the cache.  If it is not a "
      "cache variable, then this always writes into the current makefile. The "
      "FORCE option will overwrite the cache value removing any changes by "
      "the user.\n"
      "If PARENT_SCOPE is present, the variable will be set in the scope "
      "above the current scope. Each new directory or function creates a new "
      "scope. This command will set the value of a variable into the parent "
      "directory or calling function (whichever is applicable to the case at "
      "hand).\n"
      "If <value> is not specified then the variable is removed "
      "instead of set.  See also: the unset() command.\n"
      "  set(<variable> <value1> ... <valueN>)\n"
      "In this case <variable> is set to a semicolon separated list of "
      "values.\n"
      "<variable> can be an environment variable such as:\n"
      "  set( ENV{PATH} /home/martink )\n"
      "in which case the environment variable will be set.";
    }
  
  cmTypeMacro(cmSetCommand, cmCommand);
};



#endif