/*============================================================================
  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 "cmIncludeDirectoryCommand.h"

// cmIncludeDirectoryCommand
bool cmIncludeDirectoryCommand
::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
{
  if(args.size() < 1 )
    {
    return true;
    }

  std::vector<std::string>::const_iterator i = args.begin();

  bool before = this->Makefile->IsOn("CMAKE_INCLUDE_DIRECTORIES_BEFORE");
  bool system = false;

  if ((*i) == "BEFORE")
    {
    before = true;
    ++i;
    }
  else if ((*i) == "AFTER")
    {
    before = false;
    ++i;
    }

  std::vector<std::string> beforeIncludes;
  std::vector<std::string> afterIncludes;
  std::set<std::string> systemIncludes;

  for(; i != args.end(); ++i)
    {
    if(*i == "SYSTEM")
      {
      system = true;
      continue;
      }
    if(i->size() == 0)
      {
      this->SetError("given empty-string as include directory.");
      return false;
      }

    std::vector<std::string> includes;

    this->GetIncludes(*i, includes);

    if (before)
      {
      beforeIncludes.insert(beforeIncludes.end(),
                            includes.begin(),
                            includes.end());
      }
    else
      {
      afterIncludes.insert(afterIncludes.end(),
                           includes.begin(),
                           includes.end());
      }
    if (system)
      {
      systemIncludes.insert(includes.begin(), includes.end());
      }
    }
  std::reverse(beforeIncludes.begin(), beforeIncludes.end());

  this->Makefile->AddIncludeDirectories(afterIncludes);
  this->Makefile->AddIncludeDirectories(beforeIncludes, before);
  this->Makefile->AddSystemIncludeDirectories(systemIncludes);

  return true;
}

static bool StartsWithGeneratorExpression(const std::string &input)
{
  return input[0] == '$' && input[1] == '<';
}

// do a lot of cleanup on the arguments because this is one place where folks
// sometimes take the output of a program and pass it directly into this
// command not thinking that a single argument could be filled with spaces
// and newlines etc liek below:
//
// "   /foo/bar
//    /boo/hoo /dingle/berry "
//
// ideally that should be three separate arguments but when sucking the
// output from a program and passing it into a command the cleanup doesn't
// always happen
//
void cmIncludeDirectoryCommand::GetIncludes(const std::string &arg,
                                            std::vector<std::string> &incs)
{
  // break apart any line feed arguments
  std::string::size_type pos = 0;
  std::string::size_type lastPos = 0;
  while((pos = arg.find('\n', lastPos)) != std::string::npos)
    {
    if (pos)
      {
      std::string inc = arg.substr(lastPos,pos);
      this->NormalizeInclude(inc);
      if (!inc.empty())
        {
        incs.push_back(inc);
        }
      }
    lastPos = pos + 1;
    }
  std::string inc = arg.substr(lastPos);
  this->NormalizeInclude(inc);
  if (!inc.empty())
    {
    incs.push_back(inc);
    }
}

void cmIncludeDirectoryCommand::NormalizeInclude(std::string &inc)
{
  std::string::size_type b = inc.find_first_not_of(" \r");
  std::string::size_type e = inc.find_last_not_of(" \r");
  if ((b!=inc.npos) && (e!=inc.npos))
    {
    inc.assign(inc, b, 1+e-b);   // copy the remaining substring
    }
  else
    {
    inc = "";
    return;
    }

  if (!cmSystemTools::IsOff(inc.c_str()))
    {
    cmSystemTools::ConvertToUnixSlashes(inc);

    if(!cmSystemTools::FileIsFullPath(inc.c_str()))
      {
      if(!StartsWithGeneratorExpression(inc))
        {
        std::string tmp = this->Makefile->GetStartDirectory();
        tmp += "/";
        tmp += inc;
        inc = tmp;
        }
      }
    }
}