/*============================================================================
  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.
============================================================================*/
#include "cmOptionCommand.h"

// cmOptionCommand
bool cmOptionCommand::InitialPass(std::vector<std::string> const& args,
                                  cmExecutionStatus&)
{
  bool argError = false;
  if (args.size() < 2) {
    argError = true;
  }
  // for VTK 4.0 we have to support the option command with more than 3
  // arguments if CMAKE_MINIMUM_REQUIRED_VERSION is not defined, if
  // CMAKE_MINIMUM_REQUIRED_VERSION is defined, then we can have stricter
  // checking.
  if (this->Makefile->GetDefinition("CMAKE_MINIMUM_REQUIRED_VERSION")) {
    if (args.size() > 3) {
      argError = true;
    }
  }
  if (argError) {
    std::string m = "called with incorrect number of arguments: ";
    m += cmJoin(args, " ");
    this->SetError(m);
    return false;
  }

  std::string initialValue = "Off";
  // Now check and see if the value has been stored in the cache
  // already, if so use that value and don't look for the program
  cmState* state = this->Makefile->GetState();
  const char* existingValue = state->GetCacheEntryValue(args[0]);
  if (existingValue) {
    if (state->GetCacheEntryType(args[0]) != cmState::UNINITIALIZED) {
      state->SetCacheEntryProperty(args[0], "HELPSTRING", args[1]);
      return true;
    }
    initialValue = existingValue;
  }
  if (args.size() == 3) {
    initialValue = args[2];
  }
  bool init = cmSystemTools::IsOn(initialValue.c_str());
  this->Makefile->AddCacheDefinition(args[0], init ? "ON" : "OFF",
                                     args[1].c_str(), cmState::BOOL);
  return true;
}