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

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html 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 "cmAddSubDirectoryCommand.h"

// cmAddSubDirectoryCommand
bool cmAddSubDirectoryCommand::InitialPass
(std::vector<std::string> const& args)
{
  if(args.size() < 1 )
    {
    this->SetError("called with incorrect number of arguments");
    return false;
    }
  
  // store the binpath
  std::string srcArg = args[0];
  std::string binArg;
  
  bool intoplevel = true;

  // process the rest of the arguments looking for optional args
  std::vector<std::string>::const_iterator i = args.begin();
  ++i;
  for(;i != args.end(); ++i)
    {
    if(*i == "EXCLUDE_FROM_ALL")
      {
      intoplevel = false;
      continue;
      }
    else if (!binArg.size())
      {
      binArg = *i;
      }
    else
      {
      this->SetError("called with incorrect number of arguments");
      return false;
      }
    }

  // check for relative arguments
  bool relativeSource = true;
  std::string binPath = binArg;
  std::string srcPath = std::string(this->Makefile->GetCurrentDirectory()) + 
    "/" + srcArg;
  // if the path does not exist then the arg was relative
  if (!cmSystemTools::FileIsDirectory(srcPath.c_str()))
    {
    relativeSource = false;
    srcPath = srcArg;
    if (!cmSystemTools::FileIsDirectory(srcPath.c_str()))
      {
      std::string error = "Incorrect ADD_SUBDIRECTORY command. Directory: ";
      error += srcArg + " does not exists.";
      this->SetError(error.c_str());   
      return false;
      }
    }
  
  // at this point srcPath has the full path to the source directory
  // now we need to compute the binPath if it was not provided
  
  // if the argument was provided then use it
  if (binArg.size())
    {
    if (!cmSystemTools::FileIsFullPath(binPath.c_str()))
      {
      binPath = std::string(this->Makefile->GetCurrentOutputDirectory()) + 
        "/" + binArg.c_str();
      }
    }
  // otherwise compute the binPath from the srcPath
  else
    {
    // if the srcArg was relative then we just do the same for the binPath
    if (relativeSource)
      {
      binPath = std::string(this->Makefile->GetCurrentOutputDirectory()) + 
        "/" + srcArg;
      }
    // otherwise we try to remove the CurrentDirectory from the srcPath and
    // replace it with the CurrentOutputDirectory. This may not really work
    // because the source dir they provided may not be "in" the source
    // tree. This is an error if this happens.
    else
      {
      // try replacing the home dir with the home output dir
      binPath = srcPath;
      if (!cmSystemTools::FindLastString(binPath.c_str(), 
                                         this->Makefile->GetHomeDirectory()))
        {
        this->SetError("A full source directory was specified that is not "
                       "in the source tree but no binary directory was "
                       "specified. If you specify an out of tree source "
                       "directory then you must provide the binary "
                       "directory as well.");   
        return false;
        }
      cmSystemTools::ReplaceString(binPath,
                                   this->Makefile->GetHomeDirectory(), 
                                   this->Makefile->GetHomeOutputDirectory());
      }
    }
  
  // now we have all the arguments
  this->Makefile->AddSubDirectory(srcPath.c_str(), binPath.c_str(),
                              intoplevel, false, true);

  return true;
}