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

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

  Copyright (c) 2002 Insight Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmGlobalGenerator.h"
#include "cmLocalGenerator.h"
#include "cmake.h"
#include "cmMakefile.h"

cmGlobalGenerator::cmGlobalGenerator()
{
}

cmGlobalGenerator::~cmGlobalGenerator()
{
  // Delete any existing cmLocalGenerators
  unsigned int i;
  for (i = 0; i < m_LocalGenerators.size(); ++i)
    {
    delete m_LocalGenerators[i];
    }
  m_LocalGenerators.clear();
}

void cmGlobalGenerator::SetLanguageEnabled(const char* l)
{
  m_LanguageEnabled[l] = true;
}

bool cmGlobalGenerator::GetLanguageEnabled(const char* l)
{
  return (m_LanguageEnabled.count(l) > 0);
}

void cmGlobalGenerator::ClearEnabledLanguages()
{
  m_LanguageEnabled.clear();
}

void cmGlobalGenerator::Configure()
{
  // Delete any existing cmLocalGenerators
  unsigned int i;
  for (i = 0; i < m_LocalGenerators.size(); ++i)
    {
    delete m_LocalGenerators[i];
    }
  m_LocalGenerators.clear();
  
  // start with this directory
  cmLocalGenerator *lg = this->CreateLocalGenerator();
  m_LocalGenerators.push_back(lg);

  // set the Start directories
  lg->GetMakefile()->SetStartDirectory(m_CMakeInstance->GetStartDirectory());
  lg->GetMakefile()->SetStartOutputDirectory(m_CMakeInstance->GetStartOutputDirectory());
  lg->GetMakefile()->MakeStartDirectoriesCurrent();
  
  // now do it
  this->RecursiveConfigure(lg,0.0f,0.9f);

  // after it is all done do a ConfigureFinalPass
  for (i = 0; i < m_LocalGenerators.size(); ++i)
    {
    m_LocalGenerators[i]->ConfigureFinalPass();
    m_CMakeInstance->UpdateProgress("Configuring", 
                                    0.9f+0.1f*(i+1.0f)/m_LocalGenerators.size());
    }
  m_CMakeInstance->UpdateProgress("Configuring done", -1);
}

// loop through the directories creating cmLocalGenerators and Configure()
void cmGlobalGenerator::RecursiveConfigure(cmLocalGenerator *lg, 
                                           float startProgress, 
                                           float endProgress)
{
  // configure the current directory
  lg->Configure();
                                  
  // get all the subdirectories
  std::vector<std::string> subdirs = lg->GetMakefile()->GetSubDirectories();
  float progressPiece = (endProgress - startProgress)/(1.0f+subdirs.size());
  m_CMakeInstance->UpdateProgress("Configuring",
                                  startProgress + progressPiece);
  
  // for each subdir recurse
  unsigned int i;
  for (i = 0; i < subdirs.size(); ++i)
    {
    cmLocalGenerator *lg2 = this->CreateLocalGenerator();
    m_LocalGenerators.push_back(lg2);
    
    // add the subdir to the start output directory
    std::string outdir = lg->GetMakefile()->GetStartOutputDirectory();
    outdir += "/";
    outdir += subdirs[i];
    lg2->GetMakefile()->SetStartOutputDirectory(outdir.c_str());
    
    // add the subdir to the start source directory
    std::string currentDir = lg->GetMakefile()->GetStartDirectory();
    currentDir += "/";
    currentDir += subdirs[i];
    lg2->GetMakefile()->SetStartDirectory(currentDir.c_str());
    lg2->GetMakefile()->MakeStartDirectoriesCurrent();
  
    this->RecursiveConfigure(lg2, 
                             startProgress + (i+1.0f)*progressPiece,
                             startProgress + (i+2.0f)*progressPiece);
    }
}

void cmGlobalGenerator::Generate()
{
  // For each existing cmLocalGenerator
  unsigned int i;
  for (i = 0; i < m_LocalGenerators.size(); ++i)
    {
    m_LocalGenerators[i]->Generate(true);
    m_CMakeInstance->UpdateProgress("Generating", 
                                    (i+1.0f)/m_LocalGenerators.size());
    }
  m_CMakeInstance->UpdateProgress("Generating done", -1);
}

void cmGlobalGenerator::LocalGenerate()
{
  // for this case we create one LocalGenerator
  // configure it, and then Generate it
  // start with this directory
  cmLocalGenerator *lg = this->CreateLocalGenerator();

  // set the Start directories
  lg->GetMakefile()->SetStartDirectory(m_CMakeInstance->GetStartDirectory());
  lg->GetMakefile()->SetStartOutputDirectory(m_CMakeInstance->GetStartOutputDirectory());
  lg->GetMakefile()->MakeStartDirectoriesCurrent();
  
  // now do trhe configure
  lg->Configure();
  lg->ConfigureFinalPass();
  lg->Generate(false);
  delete lg;
}

int cmGlobalGenerator::TryCompile(const char *, const char *bindir, 
                                  const char *, const char *target,
                                  std::string *output)
{
  // now build the test
  std::string makeCommand = 
    m_CMakeInstance->GetCacheManager()->GetCacheValue("CMAKE_MAKE_PROGRAM");
  if(makeCommand.size() == 0)
    {
    cmSystemTools::Error(
      "Generator cannot find the appropriate make command.");
    return 1;
    }
  makeCommand = cmSystemTools::ConvertToOutputPath(makeCommand.c_str());

  /**
   * Run an executable command and put the stdout in output.
   */
  std::string cwd = cmSystemTools::GetCurrentWorkingDirectory();
  cmSystemTools::ChangeDirectory(bindir);

  // Since we have full control over the invocation of nmake, let us
  // make it quiet.
  if ( strcmp(this->GetName(), "NMake Makefiles") == 0 )
    {
    makeCommand += " /NOLOGO ";
    }
  
  // now build
  if (target)
    {
    makeCommand += " ";
    makeCommand += target;
#if defined(_WIN32) || defined(__CYGWIN__)
    makeCommand += ".exe";
#endif // WIN32
    }
  else
    {
    makeCommand += " all";
    }
  int retVal;
  if (!cmSystemTools::RunCommand(makeCommand.c_str(), *output, retVal, 0, false))
    {
    cmSystemTools::Error("Generator: execution of make failed.");
    // return to the original directory
    cmSystemTools::ChangeDirectory(cwd.c_str());
    return 1;
    }
  cmSystemTools::ChangeDirectory(cwd.c_str());
  return retVal;
}

cmLocalGenerator *cmGlobalGenerator::CreateLocalGenerator()
{
  cmLocalGenerator *lg = new cmLocalGenerator;
  lg->SetGlobalGenerator(this);
  return lg;
}

void cmGlobalGenerator::EnableLanguagesFromGenerator(cmGlobalGenerator *gen, 
                                                     cmMakefile *)
{
  // create a temp generator
  cmLocalGenerator *lg = this->CreateLocalGenerator();
  lg->GetMakefile()->SetStartDirectory(m_CMakeInstance->GetStartDirectory());
  lg->GetMakefile()->SetStartOutputDirectory(m_CMakeInstance->GetStartOutputDirectory());
  lg->GetMakefile()->MakeStartDirectoriesCurrent();

  // for each existing language call enable Language
  std::map<cmStdString, bool>::const_iterator i = 
    gen->m_LanguageEnabled.begin();
  for (;i != gen->m_LanguageEnabled.end(); ++i)
    {
    this->EnableLanguage(i->first.c_str(),lg->GetMakefile());
    }
  delete lg;
}