#
#
# Locate pcre
#
# This module accepts the following environment variables:
#
#    PCRE_DIR or PCRE_ROOT - Specify the location of PCRE
#
# This module defines the following CMake variables:
#
#    PCRE_FOUND - True if libpcre is found
#    PCRE_LIBRARY - A variable pointing to the PCRE library
#    PCRE_INCLUDE_DIR - Where to find the headers

#=============================================================================
# Inspired by FindGDAL
#
# 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 COPYING-CMAKE-SCRIPTS for more information.
#=============================================================================

# This makes the presumption that you are include pcre.h like
#
#include "pcre.h"

if (DEFINED PCRE_ROOT AND NOT PCRE_ROOT)
	set (PCRE_LIBRARY "" CACHE INTERNAL "")
	set (PCRE_INCLUDE_DIR "" CACHE INTERNAL "")
	return ()
endif (DEFINED PCRE_ROOT AND NOT PCRE_ROOT)

if (UNIX AND NOT PCRE_FOUND)
	# Use pcre-config to obtain the library version (this should hopefully
	# allow us to -lpcre1.x.y where x.y are correct version)
	# For some reason, libpcre development packages do not contain
	# libpcre.so...
	find_program (PCRE_CONFIG pcre-config
		HINTS
		${PCRE_DIR}
		${PCRE_ROOT}
		$ENV{PCRE_DIR}
		$ENV{PCRE_ROOT}
		PATH_SUFFIXES bin
		PATHS
		/sw # Fink
		/opt/local # DarwinPorts
		/opt/csw # Blastwave
		/opt
		/usr/local
	)

	if (PCRE_CONFIG)
		execute_process (COMMAND ${PCRE_CONFIG} --cflags
			ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
			OUTPUT_VARIABLE PCRE_CONFIG_CFLAGS)
		if (PCRE_CONFIG_CFLAGS)
			string (REGEX MATCHALL "-I[^ ]+" _pcre_dashI ${PCRE_CONFIG_CFLAGS})
			string (REGEX REPLACE "-I" "" _pcre_includepath "${_pcre_dashI}")
			string (REGEX REPLACE "-I[^ ]+" "" _pcre_cflags_other ${PCRE_CONFIG_CFLAGS})
		endif (PCRE_CONFIG_CFLAGS)
		execute_process (COMMAND ${PCRE_CONFIG} --libs
			ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
			OUTPUT_VARIABLE PCRE_CONFIG_LIBS)
		if (PCRE_CONFIG_LIBS)
			string (REGEX MATCHALL "-l[^ ]+" _pcre_dashl ${PCRE_CONFIG_LIBS})
			string (REGEX REPLACE "-l" "" _pcre_lib "${_pcre_dashl}")
			string (REGEX MATCHALL "-L[^ ]+" _pcre_dashL ${PCRE_CONFIG_LIBS})
			string (REGEX REPLACE "-L" "" _pcre_libpath "${_pcre_dashL}")
		endif (PCRE_CONFIG_LIBS)
	endif (PCRE_CONFIG)
endif (UNIX AND NOT PCRE_FOUND)

find_path (PCRE_INCLUDE_DIR pcre.h
	HINTS
	${_pcre_includepath}
	${PCRE_DIR}
	${PCRE_ROOT}
	$ENV{PCRE_DIR}
	$ENV{PCRE_ROOT}
	PATH_SUFFIXES
	include/pcre
	include/PCRE
	include
	PATHS
	~/Library/Frameworks/pcre.framework/Headers
	/Library/Frameworks/pcre.framework/Headers
	/sw # Fink
	/opt/local # DarwinPorts
	/opt/csw # Blastwave
	/opt
	/usr/local
)

find_library (PCRE_LIBRARY
	NAMES ${_pcre_lib} pcre pcre.0 PCRE
	HINTS
	${PCRE_DIR}
	${PCRE_ROOT}
	$ENV{PCRE_DIR}
	$ENV{PCRE_ROOT}
	${_pcre_libpath}
	PATH_SUFFIXES lib
	PATHS
	~/Library/Frameworks/pcre.framework
	/Library/Frameworks/pcre.framework
	/sw
	/opt/local
	/opt/csw
	/opt
	/usr/local
)

include (FindPackageHandleStandardArgs)
find_package_handle_standard_args (PCRE DEFAULT_MSG PCRE_LIBRARY PCRE_INCLUDE_DIR)

set (PCRE_LIBRARIES ${PCRE_LIBRARY})
set (PCRE_INCLUDE_DIRS ${PCRE_INCLUDE_DIR})