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

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile: cmCPackNSISGenerator.cxx,v $
  Language:  C++
  Date:      $Date: 2009-02-04 16:44:18 $
  Version:   $Revision: 1.31.2.4 $

  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 "cmCPackNSISGenerator.h"

#include "cmGlobalGenerator.h"
#include "cmLocalGenerator.h"
#include "cmSystemTools.h"
#include "cmMakefile.h"
#include "cmGeneratedFileStream.h"
#include "cmCPackLog.h"
#include "cmCPackComponentGroup.h"

#include <cmsys/SystemTools.hxx>
#include <cmsys/Glob.hxx>
#include <cmsys/Directory.hxx>
#include <cmsys/RegularExpression.hxx>

/* NSIS uses different command line syntax on Windows and others */
#ifdef _WIN32
# define NSIS_OPT "/"
#else
# define NSIS_OPT "-"
#endif

//----------------------------------------------------------------------
cmCPackNSISGenerator::cmCPackNSISGenerator()
{
}

//----------------------------------------------------------------------
cmCPackNSISGenerator::~cmCPackNSISGenerator()
{
}

//----------------------------------------------------------------------
int cmCPackNSISGenerator::CompressFiles(const char* outFileName,
  const char* toplevel, const std::vector<std::string>& files)
{
  (void)outFileName; // TODO: Fix nsis to force out file name
  (void)toplevel;
  std::string nsisInFileName = this->FindTemplate("NSIS.template.in");
  if ( nsisInFileName.size() == 0 )
    {
    cmCPackLogger(cmCPackLog::LOG_ERROR,
      "CPack error: Could not find NSIS installer template file."
      << std::endl);
    return false;
    }
  std::string nsisInInstallOptions
    = this->FindTemplate("NSIS.InstallOptions.ini.in");
  if ( nsisInInstallOptions.size() == 0 )
    {
    cmCPackLogger(cmCPackLog::LOG_ERROR,
      "CPack error: Could not find NSIS installer options file."
      << std::endl);
    return false;
    }
  std::string nsisFileName = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
  std::string tmpFile = nsisFileName;
  tmpFile += "/NSISOutput.log";
  std::string nsisInstallOptions = nsisFileName + "/NSIS.InstallOptions.ini";
  nsisFileName += "/project.nsi";
  cmOStringStream str;
  std::vector<std::string>::const_iterator it;
  for ( it = files.begin(); it != files.end(); ++ it )
    {
    std::string fileN = cmSystemTools::RelativePath(toplevel,
                                                    it->c_str());
    if (!this->Components.empty())
      {
      // Strip off the component part of the path.
      fileN = fileN.substr(fileN.find('/')+1, std::string::npos);
      }
    cmSystemTools::ReplaceString(fileN, "/", "\\");
    str << "  Delete \"$INSTDIR\\" << fileN.c_str() << "\"" << std::endl;
    }
  cmCPackLogger(cmCPackLog::LOG_DEBUG, "Uninstall Files: "
    << str.str().c_str() << std::endl);
  this->SetOptionIfNotSet("CPACK_NSIS_DELETE_FILES", str.str().c_str());
  std::vector<std::string> dirs;
  this->GetListOfSubdirectories(toplevel, dirs);
  std::vector<std::string>::const_iterator sit;
  cmOStringStream dstr;
  for ( sit = dirs.begin(); sit != dirs.end(); ++ sit )
    {
    std::string componentName;
    std::string fileN = cmSystemTools::RelativePath(toplevel, sit->c_str());
    if ( fileN.empty() )
      {
      continue;
      }
    if (!Components.empty())
      {
      // If this is a component installation, strip off the component 
      // part of the path.
      std::string::size_type slash = fileN.find('/');
      if (slash != std::string::npos)
        {
        // If this is a component installation, determine which component it
        // is.
        componentName = fileN.substr(0, slash);

        // Strip off the component part of the path.
        fileN = fileN.substr(slash+1, std::string::npos);
        }
      }
    cmSystemTools::ReplaceString(fileN, "/", "\\");
    dstr << "  RMDir \"$INSTDIR\\" << fileN.c_str() << "\"" << std::endl;
    if (!componentName.empty())
      {
      this->Components[componentName].Directories.push_back(fileN);
      }
    }
  cmCPackLogger(cmCPackLog::LOG_DEBUG, "Uninstall Dirs: "
    << dstr.str().c_str() << std::endl);
  this->SetOptionIfNotSet("CPACK_NSIS_DELETE_DIRECTORIES", 
                          dstr.str().c_str());

  cmCPackLogger(cmCPackLog::LOG_VERBOSE, "Configure file: " << nsisInFileName
    << " to " << nsisFileName << std::endl);
  if(this->IsSet("CPACK_NSIS_MUI_ICON") 
     && this->IsSet("CPACK_NSIS_MUI_UNIICON"))
    {
    std::string installerIconCode="!define MUI_ICON \"";
    installerIconCode += this->GetOption("CPACK_NSIS_MUI_ICON");
    installerIconCode += "\"\n";
    installerIconCode += "!define MUI_UNICON \"";
    installerIconCode += this->GetOption("CPACK_NSIS_MUI_UNIICON");
    installerIconCode += "\"\n";
    this->SetOptionIfNotSet("CPACK_NSIS_INSTALLER_MUI_ICON_CODE",
                            installerIconCode.c_str());
    }
  if(this->IsSet("CPACK_PACKAGE_ICON"))
    {
    std::string installerIconCode = "!define MUI_HEADERIMAGE_BITMAP \"";
    installerIconCode += this->GetOption("CPACK_PACKAGE_ICON");
    installerIconCode += "\"\n";
    this->SetOptionIfNotSet("CPACK_NSIS_INSTALLER_ICON_CODE",
                            installerIconCode.c_str());
    }

  // Setup all of the component sections
  if (this->Components.empty())
    {
    this->SetOptionIfNotSet("CPACK_NSIS_INSTALLATION_TYPES", "");
    this->SetOptionIfNotSet("CPACK_NSIS_INSTALLER_MUI_COMPONENTS_DESC", "");
    this->SetOptionIfNotSet("CPACK_NSIS_PAGE_COMPONENTS", "");
    this->SetOptionIfNotSet("CPACK_NSIS_FULL_INSTALL", 
                            "File /r \"${INST_DIR}\\*.*\"");
    this->SetOptionIfNotSet("CPACK_NSIS_COMPONENT_SECTIONS", "");
    this->SetOptionIfNotSet("CPACK_NSIS_COMPONENT_SECTION_LIST", "");
    this->SetOptionIfNotSet("CPACK_NSIS_SECTION_SELECTED_VARS", "");
    }
  else
    {
    std::string componentCode;
    std::string sectionList;
    std::string selectedVarsList;
    std::string componentDescriptions;
    std::string groupDescriptions;
    std::string installTypesCode;
    std::string defines;
    cmOStringStream macrosOut;
    bool anyDownloadedComponents = false;

    // Create installation types. The order is significant, so we first fill
    // in a vector based on the indices, and print them in that order.
    std::vector<cmCPackInstallationType *> 
      installTypes(this->InstallationTypes.size());
    std::map<std::string, cmCPackInstallationType>::iterator installTypeIt;
    for (installTypeIt = this->InstallationTypes.begin();
         installTypeIt != this->InstallationTypes.end();
         ++installTypeIt)
      {
      installTypes[installTypeIt->second.Index-1] = &installTypeIt->second;
      }
    std::vector<cmCPackInstallationType *>::iterator installTypeIt2;
    for (installTypeIt2 = installTypes.begin();
         installTypeIt2 != installTypes.end();
         ++installTypeIt2)
      {
      installTypesCode += "InstType \"";
      installTypesCode += (*installTypeIt2)->DisplayName;
      installTypesCode += "\"\n";
      }

    // Create installation groups first
    std::map<std::string, cmCPackComponentGroup>::iterator groupIt;
    for (groupIt = this->ComponentGroups.begin();
         groupIt != this->ComponentGroups.end();
         ++groupIt)
      {
      if (groupIt->second.ParentGroup == 0)
        {
        componentCode += 
          this->CreateComponentGroupDescription(&groupIt->second, macrosOut);
        }

      // Add the group description, if any.
      if (!groupIt->second.Description.empty())
        {
        groupDescriptions += "  !insertmacro MUI_DESCRIPTION_TEXT ${" 
          + groupIt->first + "} \"" 
          + this->TranslateNewlines(groupIt->second.Description) + "\"\n";
        }
      }

    // Create the remaining components, which aren't associated with groups.
    std::map<std::string, cmCPackComponent>::iterator compIt;
    for (compIt = this->Components.begin();
         compIt != this->Components.end();
         ++compIt)
      {
      if (compIt->second.Files.empty())
        {
        // NSIS cannot cope with components that have no files.
        continue;
        }

      anyDownloadedComponents =
        anyDownloadedComponents || compIt->second.IsDownloaded;

      if (!compIt->second.Group)
        {
        componentCode 
          += this->CreateComponentDescription(&compIt->second, macrosOut);
        }

      // Add this component to the various section lists.
      sectionList += "  !insertmacro \"${MacroName}\" \"";
      sectionList += compIt->first;
      sectionList += "\"\n";
      selectedVarsList += "Var " + compIt->first + "_selected\n";
      selectedVarsList += "Var " + compIt->first + "_was_installed\n";

      // Add the component description, if any.
      if (!compIt->second.Description.empty())
        {
        componentDescriptions += "  !insertmacro MUI_DESCRIPTION_TEXT ${" 
          + compIt->first + "} \"" 
          + this->TranslateNewlines(compIt->second.Description) + "\"\n";
        }
      }

    componentCode += macrosOut.str();

    if (componentDescriptions.empty() && groupDescriptions.empty())
      {
      // Turn off the "Description" box
      this->SetOptionIfNotSet("CPACK_NSIS_INSTALLER_MUI_COMPONENTS_DESC", 
                              "!define MUI_COMPONENTSPAGE_NODESC");
      }
    else
      {
      componentDescriptions = 
        "!insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN\n"
        + componentDescriptions
        + groupDescriptions
        + "!insertmacro MUI_FUNCTION_DESCRIPTION_END\n";
      this->SetOptionIfNotSet("CPACK_NSIS_INSTALLER_MUI_COMPONENTS_DESC", 
                              componentDescriptions.c_str());
      }

    if (anyDownloadedComponents)
      {
      defines += "!define CPACK_USES_DOWNLOAD\n";
      if (cmSystemTools::IsOn(this->GetOption("CPACK_ADD_REMOVE")))
        {
        defines += "!define CPACK_NSIS_ADD_REMOVE\n";
        }
      }

    this->SetOptionIfNotSet("CPACK_NSIS_INSTALLATION_TYPES",
                            installTypesCode.c_str());
    this->SetOptionIfNotSet("CPACK_NSIS_PAGE_COMPONENTS",
                            "!insertmacro MUI_PAGE_COMPONENTS");
    this->SetOptionIfNotSet("CPACK_NSIS_FULL_INSTALL", "");
    this->SetOptionIfNotSet("CPACK_NSIS_COMPONENT_SECTIONS",
                            componentCode.c_str());
    this->SetOptionIfNotSet("CPACK_NSIS_COMPONENT_SECTION_LIST",
                            sectionList.c_str());
    this->SetOptionIfNotSet("CPACK_NSIS_SECTION_SELECTED_VARS", 
                            selectedVarsList.c_str());
    this->SetOption("CPACK_NSIS_DEFINES", defines.c_str());
    }

  this->ConfigureFile(nsisInInstallOptions.c_str(), 
                      nsisInstallOptions.c_str());
  this->ConfigureFile(nsisInFileName.c_str(), nsisFileName.c_str());
  std::string nsisCmd = "\"";
  nsisCmd += this->GetOption("CPACK_INSTALLER_PROGRAM");
  nsisCmd += "\" \"" + nsisFileName + "\"";
  cmCPackLogger(cmCPackLog::LOG_VERBOSE, "Execute: " << nsisCmd.c_str()
    << std::endl);
  std::string output;
  int retVal = 1;
  bool res = cmSystemTools::RunSingleCommand(nsisCmd.c_str(), &output,
    &retVal, 0, this->GeneratorVerbose, 0);
  if ( !res || retVal )
    {
    cmGeneratedFileStream ofs(tmpFile.c_str());
    ofs << "# Run command: " << nsisCmd.c_str() << std::endl
      << "# Output:" << std::endl
      << output.c_str() << std::endl;
    cmCPackLogger(cmCPackLog::LOG_ERROR, "Problem running NSIS command: "
      << nsisCmd.c_str() << std::endl
      << "Please check " << tmpFile.c_str() << " for errors" << std::endl);
    return 0;
    }
  return 1;
}

//----------------------------------------------------------------------
int cmCPackNSISGenerator::InitializeInternal()
{
  if ( cmSystemTools::IsOn(this->GetOption(
        "CPACK_INCLUDE_TOPLEVEL_DIRECTORY")) )
    {
    cmCPackLogger(cmCPackLog::LOG_ERROR,
      "NSIS Generator cannot work with CPACK_INCLUDE_TOPLEVEL_DIRECTORY. "
      "This option will be ignored."
      << std::endl);
    this->SetOption("CPACK_INCLUDE_TOPLEVEL_DIRECTORY", 0);
    }

  cmCPackLogger(cmCPackLog::LOG_DEBUG, "cmCPackNSISGenerator::Initialize()"
    << std::endl);
  std::vector<std::string> path;
  std::string nsisPath;

#ifdef _WIN32
  if ( !cmsys::SystemTools::ReadRegistryValue(
      "HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS", nsisPath,
      cmsys::SystemTools::KeyWOW64_32) )
    {
    if ( !cmsys::SystemTools::ReadRegistryValue(
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS", nsisPath) )
      {
      cmCPackLogger
        (cmCPackLog::LOG_ERROR,
         "Cannot find NSIS registry value. This is usually caused by NSIS "
         "not being installed. Please install NSIS from "
         "http://nsis.sourceforge.net"
         << std::endl);
      return 0;
      }
    }
  path.push_back(nsisPath);
#endif
  nsisPath = cmSystemTools::FindProgram("makensis", path, false);
  if ( nsisPath.empty() )
    {
    cmCPackLogger(cmCPackLog::LOG_ERROR, "Cannot find NSIS compiler"
      << std::endl);
    return 0;
    }
  std::string nsisCmd = "\"" + nsisPath + "\" " NSIS_OPT "VERSION";
  cmCPackLogger(cmCPackLog::LOG_VERBOSE, "Test NSIS version: "
    << nsisCmd.c_str() << std::endl);
  std::string output;
  int retVal = 1;
  bool resS = cmSystemTools::RunSingleCommand(nsisCmd.c_str(),
    &output, &retVal, 0, this->GeneratorVerbose, 0);

  cmsys::RegularExpression versionRex("v([0-9]+.[0-9]+)");
  if ( !resS || retVal || !versionRex.find(output))
    {
    std::string tmpFile = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
    tmpFile += "/NSISOutput.log";
    cmGeneratedFileStream ofs(tmpFile.c_str());
    ofs << "# Run command: " << nsisCmd.c_str() << std::endl
      << "# Output:" << std::endl
      << output.c_str() << std::endl;
    cmCPackLogger(cmCPackLog::LOG_ERROR,
      "Problem checking NSIS version with command: "
      << nsisCmd.c_str() << std::endl
      << "Please check " << tmpFile.c_str() << " for errors" << std::endl);
    return 0;
    }
  double nsisVersion = atof(versionRex.match(1).c_str());
  double minNSISVersion = 2.09;
  cmCPackLogger(cmCPackLog::LOG_DEBUG, "NSIS Version: "
    << nsisVersion << std::endl);
  if ( nsisVersion < minNSISVersion )
    {
    cmCPackLogger(cmCPackLog::LOG_ERROR,
      "CPack requires NSIS Version 2.09 or greater. NSIS found on the system "
      "was: "
      << nsisVersion << std::endl);
    return 0;
    }
  this->SetOptionIfNotSet("CPACK_INSTALLER_PROGRAM", nsisPath.c_str());
  const char* cpackPackageExecutables
    = this->GetOption("CPACK_PACKAGE_EXECUTABLES");
  const char* cpackPackageDeskTopLinks
    = this->GetOption("CPACK_CREATE_DESKTOP_LINKS");
  std::vector<std::string> cpackPackageDesktopLinksVector;
  if(cpackPackageDeskTopLinks)
    {
    cmCPackLogger(cmCPackLog::LOG_DEBUG, "CPACK_CREATE_DESKTOP_LINKS: "
                << cpackPackageDeskTopLinks << std::endl);
    
    cmSystemTools::
      ExpandListArgument(cpackPackageDeskTopLinks,
                         cpackPackageDesktopLinksVector);
    for(std::vector<std::string>::iterator i = 
          cpackPackageDesktopLinksVector.begin(); i !=
          cpackPackageDesktopLinksVector.end(); ++i)
      {
       cmCPackLogger(cmCPackLog::LOG_DEBUG, "CPACK_CREATE_DESKTOP_LINKS: "
                << *i << std::endl);
      }
    }
  else
    {
    cmCPackLogger(cmCPackLog::LOG_DEBUG, "CPACK_CREATE_DESKTOP_LINKS: "
                  << "not set" << std::endl);
    }
  if ( cpackPackageExecutables )
    {
    cmCPackLogger(cmCPackLog::LOG_DEBUG, "The cpackPackageExecutables: "
      << cpackPackageExecutables << "." << std::endl);
    cmOStringStream str;
    cmOStringStream deleteStr;
    std::vector<std::string> cpackPackageExecutablesVector;
    cmSystemTools::ExpandListArgument(cpackPackageExecutables,
      cpackPackageExecutablesVector);
    if ( cpackPackageExecutablesVector.size() % 2 != 0 )
      {
      cmCPackLogger(cmCPackLog::LOG_ERROR,
        "CPACK_PACKAGE_EXECUTABLES should contain pairs of <executable> and "
        "<icon name>." << std::endl);
      return 0;
      }
    std::vector<std::string>::iterator it;
    for ( it = cpackPackageExecutablesVector.begin();
          it != cpackPackageExecutablesVector.end();
          ++it )
      {
      std::string execName = *it;
      ++ it;
      std::string linkName = *it;
      str << "  CreateShortCut \"$SMPROGRAMS\\$STARTMENU_FOLDER\\"
        << linkName << ".lnk\" \"$INSTDIR\\bin\\" << execName << ".exe\""
        << std::endl;
      deleteStr << "  Delete \"$SMPROGRAMS\\$MUI_TEMP\\" << linkName
        << ".lnk\"" << std::endl;
      // see if CPACK_CREATE_DESKTOP_LINK_ExeName is on
      // if so add a desktop link
      if(cpackPackageDesktopLinksVector.size() &&
         std::find(cpackPackageDesktopLinksVector.begin(),
                   cpackPackageDesktopLinksVector.end(),
                   execName) 
         != cpackPackageDesktopLinksVector.end())
        {
        str << "  StrCmp \"$INSTALL_DESKTOP\" \"1\" 0 +2\n";
        str << "    CreateShortCut \"$DESKTOP\\"
            << linkName << ".lnk\" \"$INSTDIR\\bin\\" << execName << ".exe\""
            << std::endl;
        deleteStr << "  StrCmp \"$INSTALL_DESKTOP\" \"1\" 0 +2\n";
        deleteStr << "    Delete \"$DESKTOP\\" << linkName
                  << ".lnk\"" << std::endl;
        }
      }
    this->CreateMenuLinks(str, deleteStr);
    this->SetOptionIfNotSet("CPACK_NSIS_CREATE_ICONS", str.str().c_str());
    this->SetOptionIfNotSet("CPACK_NSIS_DELETE_ICONS", 
                            deleteStr.str().c_str());
    }
  this->SetOptionIfNotSet("CPACK_NSIS_COMPRESSOR", "lzma");

  return this->Superclass::InitializeInternal();
}

//----------------------------------------------------------------------
void cmCPackNSISGenerator::CreateMenuLinks( cmOStringStream& str,
                                            cmOStringStream& deleteStr)
{
  const char* cpackMenuLinks
    = this->GetOption("CPACK_NSIS_MENU_LINKS");
  if(!cpackMenuLinks)
    {
    return;
    }
  cmCPackLogger(cmCPackLog::LOG_DEBUG, "The cpackMenuLinks: "
                << cpackMenuLinks << "." << std::endl);
  std::vector<std::string> cpackMenuLinksVector;
  cmSystemTools::ExpandListArgument(cpackMenuLinks,
                                    cpackMenuLinksVector);
  if ( cpackMenuLinksVector.size() % 2 != 0 )
    {
    cmCPackLogger(
      cmCPackLog::LOG_ERROR,
      "CPACK_PACKAGE_EXECUTABLES should contain pairs of <executable> and "
      "<icon name>." << std::endl);
    return;
    }
  std::vector<std::string>::iterator it;
  for ( it = cpackMenuLinksVector.begin();
        it != cpackMenuLinksVector.end();
        ++it )
    {
    std::string sourceName = *it;
    bool url = false;
    if(sourceName.find("http:") == 0)
      {
      url = true;
      }
    /* convert / to \\ */
    if(!url)
      {
      cmSystemTools::ReplaceString(sourceName, "/", "\\");
      }
    ++ it;
    std::string linkName = *it;
    if(!url)
      {
      str << "  CreateShortCut \"$SMPROGRAMS\\$STARTMENU_FOLDER\\"
          << linkName << ".lnk\" \"$INSTDIR\\" << sourceName << "\""
          << std::endl;
      deleteStr << "  Delete \"$SMPROGRAMS\\$MUI_TEMP\\" << linkName
                << ".lnk\"" << std::endl;
      }
    else
      {
      str << "  WriteINIStr \"$SMPROGRAMS\\$STARTMENU_FOLDER\\"
          << linkName << ".url\" \"InternetShortcut\" \"URL\" \"" 
          << sourceName << "\""
          << std::endl;
      deleteStr << "  Delete \"$SMPROGRAMS\\$MUI_TEMP\\" << linkName
                << ".url\"" << std::endl;
      }
    // see if CPACK_CREATE_DESKTOP_LINK_ExeName is on
    // if so add a desktop link
    std::string desktop = "CPACK_CREATE_DESKTOP_LINK_";
    desktop += linkName;
    if(this->IsSet(desktop.c_str()))
      {
      str << "  StrCmp \"$INSTALL_DESKTOP\" \"1\" 0 +2\n";
      str << "    CreateShortCut \"$DESKTOP\\"
          << linkName << ".lnk\" \"$INSTDIR\\" << sourceName << "\""
          << std::endl;
      deleteStr << "  StrCmp \"$INSTALL_DESKTOP\" \"1\" 0 +2\n";
      deleteStr << "    Delete \"$DESKTOP\\" << linkName
                << ".lnk\"" << std::endl;
      }
    }
}

//----------------------------------------------------------------------
bool cmCPackNSISGenerator::GetListOfSubdirectories(const char* topdir,
  std::vector<std::string>& dirs)
{
  cmsys::Directory dir;
  dir.Load(topdir);
  size_t fileNum;
  for (fileNum = 0; fileNum <  dir.GetNumberOfFiles(); ++fileNum)
    {
    if (strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".") &&
        strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".."))
      {
      cmsys_stl::string fullPath = topdir;
      fullPath += "/";
      fullPath += dir.GetFile(static_cast<unsigned long>(fileNum));
      if(cmsys::SystemTools::FileIsDirectory(fullPath.c_str()) &&
        !cmsys::SystemTools::FileIsSymlink(fullPath.c_str()))
        {
        if (!this->GetListOfSubdirectories(fullPath.c_str(), dirs))
          {
          return false;
          }
        }
      }
    }
  dirs.push_back(topdir);
  return true;
}

//----------------------------------------------------------------------
bool cmCPackNSISGenerator::SupportsComponentInstallation() const
{
        return true;
}

//----------------------------------------------------------------------
std::string 
cmCPackNSISGenerator::
CreateComponentDescription(cmCPackComponent *component, 
                           cmOStringStream& macrosOut)
{
  // Basic description of the component
  std::string componentCode = "Section ";
  if (component->IsDisabledByDefault)
    {
    componentCode += "/o ";
    }
  componentCode += "\"";
  if (component->IsHidden)
    {
    componentCode += "-";
    }
  componentCode += component->DisplayName + "\" " + component->Name + "\n";
  if (component->IsRequired) 
    {
    componentCode += "  SectionIn RO\n";
    }
  else if (!component->InstallationTypes.empty())
    {
    cmOStringStream out;
    std::vector<cmCPackInstallationType *>::iterator installTypeIter;
    for (installTypeIter = component->InstallationTypes.begin();
         installTypeIter != component->InstallationTypes.end();
         ++installTypeIter)
      {
      out << " " << (*installTypeIter)->Index;
      }
    componentCode += "  SectionIn" + out.str() + "\n";
    }
  componentCode += "  SetOutPath \"$INSTDIR\"\n";

  componentCode += "  IntCmp $" + component->Name 
    + "_was_installed ${SF_SELECTED} noinstall_" + component->Name + "\n";

  // Create the actual installation commands
  if (component->IsDownloaded)
    {
    if (component->ArchiveFile.empty())
      {
      // Compute the name of the archive.
      std::string packagesDir = this->GetOption("CPACK_TEMPORARY_DIRECTORY");
      packagesDir += ".dummy";
      cmOStringStream out;
      out << cmSystemTools::GetFilenameWithoutLastExtension(packagesDir)
        << "-" << component->Name << ".zip";
      component->ArchiveFile = out.str();
      }

    // Create the directory for the upload area
    const char* userUploadDirectory = 
      this->GetOption("CPACK_UPLOAD_DIRECTORY");
    std::string uploadDirectory;
    if (userUploadDirectory && *userUploadDirectory)
      {
      uploadDirectory = userUploadDirectory;
      }
    else
      {
      uploadDirectory= this->GetOption("CPACK_PACKAGE_DIRECTORY");
      uploadDirectory += "/CPackUploads";
      }
    if(!cmSystemTools::FileExists(uploadDirectory.c_str()))
      {
      if (!cmSystemTools::MakeDirectory(uploadDirectory.c_str()))
        {
        cmCPackLogger(cmCPackLog::LOG_ERROR,
          "Unable to create NSIS upload directory " << uploadDirectory
          << std::endl);
        return "";
        }
      }

    // Remove the old archive, if one exists
    std::string archiveFile = uploadDirectory + '/' + component->ArchiveFile;
    cmCPackLogger(cmCPackLog::LOG_OUTPUT,
                  "-   Building downloaded component archive: " 
                  << archiveFile << std::endl);
    if (cmSystemTools::FileExists(archiveFile.c_str(), true))
      {
        if (!cmSystemTools::RemoveFile(archiveFile.c_str()))
        {
        cmCPackLogger(cmCPackLog::LOG_ERROR,
          "Unable to remove archive file " << archiveFile
          << std::endl);
        return "";
        }
      }

    // Find a ZIP program
    if (!this->IsSet("ZIP_EXECUTABLE"))
      {
      this->ReadListFile("CPackZIP.cmake");

      if (!this->IsSet("ZIP_EXECUTABLE"))
        {
        cmCPackLogger(cmCPackLog::LOG_ERROR,
          "Unable to find ZIP program"
          << std::endl);
        return "";
        }
      }

    // The directory where this component's files reside
    std::string dirName = this->GetOption("CPACK_TEMPORARY_DIRECTORY");
    dirName += '/';
    dirName += component->Name;
    dirName += '/';

    // Build the list of files to go into this archive, and determine the 
    // size of the installed component.
    std::string zipListFileName = this->GetOption("CPACK_TEMPORARY_DIRECTORY");
    zipListFileName += "/winZip.filelist";
    bool needQuotesInFile 
      = cmSystemTools::IsOn(this->GetOption("CPACK_ZIP_NEED_QUOTES"));
    unsigned long totalSize = 0;
    { // the scope is needed for cmGeneratedFileStream
      cmGeneratedFileStream out(zipListFileName.c_str());
      std::vector<std::string>::iterator fileIt;
      for (fileIt = component->Files.begin(); 
           fileIt != component->Files.end(); 
           ++fileIt)
        {
        if ( needQuotesInFile )
          {
          out << "\"";
          }
        out << *fileIt;
        if ( needQuotesInFile )
          {
          out << "\"";
          }
        out << std::endl;

        totalSize += cmSystemTools::FileLength((dirName + *fileIt).c_str());
        }
    }

    // Build the archive in the upload area
    std::string cmd = this->GetOption("CPACK_ZIP_COMMAND");
    cmsys::SystemTools::ReplaceString(cmd, "<ARCHIVE>", archiveFile.c_str());
    cmsys::SystemTools::ReplaceString(cmd, "<FILELIST>", 
                                      zipListFileName.c_str());
    std::string output;
    int retVal = -1;
    int res = cmSystemTools::RunSingleCommand(cmd.c_str(), &output, &retVal, 
                                              dirName.c_str(), false, 0);
    if ( !res || retVal )
    {
      std::string tmpFile = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
      tmpFile += "/CompressZip.log";
      cmGeneratedFileStream ofs(tmpFile.c_str());
      ofs << "# Run command: " << cmd.c_str() << std::endl
        << "# Output:" << std::endl
        << output.c_str() << std::endl;
      cmCPackLogger(cmCPackLog::LOG_ERROR, "Problem running zip command: "
        << cmd.c_str() << std::endl
        << "Please check " << tmpFile.c_str() << " for errors" << std::endl);
      return "";
    }
    
    // Create the NSIS code to download this file on-the-fly.
    unsigned totalSizeInKbytes = (totalSize + 512) / 1024;
    if (totalSizeInKbytes == 0)
      {
      totalSizeInKbytes = 1;
      }
    cmOStringStream out;
    out << "  AddSize " << totalSizeInKbytes << "\n"
        << "  Push \"" << component->ArchiveFile << "\"\n"
        << "  Call DownloadFile\n"
        << "  ZipDLL::extractall \"$INSTDIR\\" 
        << component->ArchiveFile << "\" \"$INSTDIR\"\n"
        <<  "  Pop $2 ; error message\n"
                     "  StrCmp $2 \"success\" +2 0\n"
                     "  MessageBox MB_OK \"Failed to unzip $2\"\n"
                     "  Delete $INSTDIR\\$0\n";
    componentCode += out.str();
    }
  else
    {
    componentCode += "  File /r \"${INST_DIR}\\" +
      component->Name + "\\*.*\"\n";
    }
  componentCode += "  noinstall_" + component->Name + ":\n";
  componentCode += "SectionEnd\n";

  // Macro used to remove the component
  macrosOut << "!macro Remove_${" << component->Name << "}\n";
  macrosOut << "  IntCmp $" << component->Name << "_was_installed 0 noremove_"
            << component->Name << "\n";
  std::vector<std::string>::iterator pathIt;
  std::string path;
  for (pathIt = component->Files.begin();
       pathIt != component->Files.end();
       ++pathIt)
    {
    path = *pathIt;
    cmSystemTools::ReplaceString(path, "/", "\\");
    macrosOut << "  Delete \"$INSTDIR\\"
              << path.c_str()
              << "\"\n";
    }
  for (pathIt = component->Directories.begin();
       pathIt != component->Directories.end();
       ++pathIt)
    {
    path = *pathIt;
    cmSystemTools::ReplaceString(path, "/", "\\");
    macrosOut << "  RMDir \"$INSTDIR\\"
              << path.c_str()
              << "\"\n";
    }
  macrosOut << "  noremove_" << component->Name << ":\n";
  macrosOut << "!macroend\n";

  // Macro used to select each of the components that this component
  // depends on.
  std::set<cmCPackComponent *> visited;
  macrosOut << "!macro Select_" << component->Name << "_depends\n";
  macrosOut << CreateSelectionDependenciesDescription(component, visited);
  macrosOut << "!macroend\n";

  // Macro used to deselect each of the components that depend on this
  // component.
  visited.clear();
  macrosOut << "!macro Deselect_required_by_" << component->Name << "\n";
  macrosOut << CreateDeselectionDependenciesDescription(component, visited);
  macrosOut << "!macroend\n";
  return componentCode;
}

//----------------------------------------------------------------------
std::string cmCPackNSISGenerator::CreateSelectionDependenciesDescription
              (cmCPackComponent *component,
               std::set<cmCPackComponent *>& visited)
{
  // Don't visit a component twice
  if (visited.count(component)) 
    {
    return std::string();
    }
  visited.insert(component);

  cmOStringStream out;
  std::vector<cmCPackComponent *>::iterator dependIt;
  for (dependIt = component->Dependencies.begin();
       dependIt != component->Dependencies.end();
       ++dependIt)
    {
    // Write NSIS code to select this dependency
    out << "  SectionGetFlags ${" << (*dependIt)->Name << "} $0\n";
    out << "  IntOp $0 $0 | ${SF_SELECTED}\n";
    out << "  SectionSetFlags ${" << (*dependIt)->Name << "} $0\n";
    out << "  IntOp $" << (*dependIt)->Name
        << "_selected 0 + ${SF_SELECTED}\n";
    // Recurse
    out << CreateSelectionDependenciesDescription(*dependIt, visited).c_str();
    }

  return out.str();
}


//----------------------------------------------------------------------
std::string cmCPackNSISGenerator::CreateDeselectionDependenciesDescription
              (cmCPackComponent *component,
                   std::set<cmCPackComponent *>& visited)
{
  // Don't visit a component twice
  if (visited.count(component)) 
    {
    return std::string();
    }
  visited.insert(component);

  cmOStringStream out;
  std::vector<cmCPackComponent *>::iterator dependIt;
  for (dependIt = component->ReverseDependencies.begin();
       dependIt != component->ReverseDependencies.end();
       ++dependIt)
    {
    // Write NSIS code to deselect this dependency
    out << "  SectionGetFlags ${" << (*dependIt)->Name << "} $0\n";
    out << "  IntOp $1 ${SF_SELECTED} ~\n";
    out << "  IntOp $0 $0 & $1\n";
    out << "  SectionSetFlags ${" << (*dependIt)->Name << "} $0\n";
    out << "  IntOp $" << (*dependIt)->Name << "_selected 0 + 0\n";
    
    // Recurse
    out <<
      CreateDeselectionDependenciesDescription(*dependIt, visited).c_str();
    }

  return out.str();
}

//----------------------------------------------------------------------
std::string 
cmCPackNSISGenerator::
CreateComponentGroupDescription(cmCPackComponentGroup *group, 
                                cmOStringStream& macrosOut)
{
  if (group->Components.empty() && group->Subgroups.empty())
    {
    // Silently skip empty groups. NSIS doesn't support them.
    return std::string();
    }

  std::string code = "SectionGroup ";
  if (group->IsExpandedByDefault)
    {
    code += "/e ";
    }
  if (group->IsBold)
    {
    code += "\"!" + group->DisplayName + "\" " + group->Name + "\n";
    }
  else
    {
    code += "\"" + group->DisplayName + "\" " + group->Name + "\n";
    }

  std::vector<cmCPackComponentGroup*>::iterator groupIt;
  for (groupIt = group->Subgroups.begin(); groupIt != group->Subgroups.end();
       ++groupIt)
    {
    code += this->CreateComponentGroupDescription(*groupIt, macrosOut);
    }

  std::vector<cmCPackComponent*>::iterator comp;
  for (comp = group->Components.begin(); 
       comp != group->Components.end(); 
       ++comp)
    {
    if ((*comp)->Files.empty())
      {
      continue;
      }

    code += this->CreateComponentDescription(*comp, macrosOut);
    }
  code += "SectionGroupEnd\n";
  return code;
}

std::string cmCPackNSISGenerator::TranslateNewlines(std::string str)
{
  cmSystemTools::ReplaceString(str, "\n", "$\\r$\\n");
  return str;
}