##=============================================================================
##
##  Copyright (c) Kitware, Inc.
##  All rights reserved.
##  See LICENSE.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 above copyright notice for more information.
##
##  Copyright 2012 Sandia Corporation.
##  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
##  the U.S. Government retains certain rights in this software.
##
##=============================================================================

#
# FindThrust
#
# This module finds the Thrust header files and extrats their version.  It
# sets the following variables.
#
# THRUST_INCLUDE_DIR -  Include directory for thrust header files.  (All header
#                       files will actually be in the thrust subdirectory.)
# THRUST_VERSION -      Version of thrust in the form "major.minor.patch".
#

find_path( THRUST_INCLUDE_DIR
  HINTS
    /usr/include/cuda
    /usr/local/include
    /usr/local/cuda/include
    ${CUDA_INCLUDE_DIRS}
  NAMES thrust/version.h
  DOC "Thrust headers"
  )
if( THRUST_INCLUDE_DIR )
  list( REMOVE_DUPLICATES THRUST_INCLUDE_DIR )
  include_directories( ${THRUST_INCLUDE_DIR} )
endif()

# Find thrust version
file( STRINGS ${THRUST_INCLUDE_DIR}/thrust/version.h
  version
  REGEX "#define THRUST_VERSION[ \t]+([0-9x]+)"
  )
string( REGEX REPLACE
  "#define THRUST_VERSION[ \t]+"
  ""
  version
  "${version}"
  )

string( REGEX MATCH "^[0-9]" major ${version} )
string( REGEX REPLACE "^${major}00" "" version "${version}" )
string( REGEX MATCH "^[0-9]" minor ${version} )
string( REGEX REPLACE "^${minor}0" "" version "${version}" )
set( THRUST_VERSION "${major}.${minor}.${version}")

# Check for required components
include( FindPackageHandleStandardArgs )
find_package_handle_standard_args( Thrust
  REQUIRED_VARS THRUST_INCLUDE_DIR
  VERSION_VAR THRUST_VERSION
  )
