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/*============================================================================
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 cmVariableWatchCommand_h
#define cmVariableWatchCommand_h
#include "cmCommand.h"
class cmVariableWatchCommandHandler
{
public:
typedef std::vector<std::string> VectorOfCommands;
VectorOfCommands Commands;
};
/** \class cmVariableWatchCommand
* \brief Watch when the variable changes and invoke command
*
*/
class cmVariableWatchCommand : public cmCommand
{
public:
/**
* This is a virtual constructor for the command.
*/
virtual cmCommand* Clone()
{
return new cmVariableWatchCommand;
}
//! Default constructor
cmVariableWatchCommand();
/**
* 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; }
/** This command does not really have a final pass but it needs to
stay alive since it owns variable watch callback information. */
virtual bool HasFinalPass() const { return true; }
/**
* The name of the command as specified in CMakeList.txt.
*/
virtual const char* GetName() const { return "variable_watch";}
/**
* Succinct documentation.
*/
virtual const char* GetTerseDocumentation() const
{
return "Watch the CMake variable for change.";
}
/**
* More documentation.
*/
virtual const char* GetFullDocumentation() const
{
return
" variable_watch(<variable name> [<command to execute>])\n"
"If the specified variable changes, the message will be printed about "
"the variable being changed. If the command is specified, the command "
"will be executed. The command will receive the following arguments:"
" COMMAND(<variable> <access> <value> <current list file> <stack>)";
}
cmTypeMacro(cmVariableWatchCommand, cmCommand);
void VariableAccessed(const std::string& variable, int access_type,
const char* newValue, const cmMakefile* mf);
protected:
std::map<std::string, cmVariableWatchCommandHandler> Handlers;
bool InCallback;
};
#endif
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