/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) 2000 National Library of Medicine
  All rights reserved.

  See COPYRIGHT.txt for copyright details.

=========================================================================*/
#ifndef cmFindProgramRule_h
#define cmFindProgramRule_h

#include "cmStandardIncludes.h"
#include "cmRuleMaker.h"

/** \class cmFindProgramRule
 * \brief Define a rule to search for an executable program.
 *
 * cmFindProgramRule is used to define a CMake variable
 * that specifies an executable program. The rule searches 
 * in the current path (e.g., PATH environment variable) for
 * an executable that matches one of the supplied names.
 */
class cmFindProgramRule : public cmRuleMaker
{
public:
  /**
   * This is a virtual constructor for the rule.
   */
  virtual cmRuleMaker* Clone() 
    {
    return new cmFindProgramRule;
    }

  /**
   * This is called when the rule is first encountered in
   * the CMakeLists.txt file.
   */
  virtual bool Invoke(std::vector<std::string>& args);

  /**
   * This is called at the end after all the information
   * specified by the rules is accumulated.
   */
  virtual void FinalPass() { }

  /**
   * This determines if the rule gets propagated down
   * to makefiles located in subdirectories.
   */
  virtual bool IsInherited() { return true;  }

  /**
   * The name of the rule as specified in CMakeList.txt.
   */
  virtual const char* GetName() { return "FIND_PROGRARM";}

  /**
   * Succinct documentation.
   */
  virtual const char* TerseDocumentation() 
    {
    return "Find an executable program.";
    }
  
  /**
   * More documentation.
   */
  virtual const char* FullDocumentation()
    {
    return
      "FIND_PROGRAM(NAME executable1 executable2 ...)";
    }
};



#endif