# FindGLib.cmake
# <https://github.com/nemequ/gnome-cmake>
#
# CMake support for GLib/GObject/GIO.
#
# License:
#
#   Copyright (c) 2016 Evan Nemerson <evan@nemerson.com>
#
#   Permission is hereby granted, free of charge, to any person
#   obtaining a copy of this software and associated documentation
#   files (the "Software"), to deal in the Software without
#   restriction, including without limitation the rights to use, copy,
#   modify, merge, publish, distribute, sublicense, and/or sell copies
#   of the Software, and to permit persons to whom the Software is
#   furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be
#   included in all copies or substantial portions of the Software.
#
#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
#   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
#   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
#   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
#   DEALINGS IN THE SOFTWARE.

find_package(PkgConfig)

if(PKG_CONFIG_FOUND)
	pkg_search_module(GLib_PKG glib-2.0)
endif()

find_library(GLib_LIBRARY glib-2.0 HINTS ${GLib_PKG_LIBRARY_DIRS})
find_library(GLib_GOBJECT_LIBRARY gobject-2.0 HINTS ${GLib_PKG_LIBRARY_DIRS})
set(GLib glib-2.0)

if(GLib_LIBRARY AND NOT GLib_FOUND)
	add_library(${GLib} SHARED IMPORTED)
	set_property(TARGET ${GLib} PROPERTY IMPORTED_LOCATION "${GLib_LIBRARY}")
	set_property(TARGET ${GLib} PROPERTY INTERFACE_COMPILE_OPTIONS "${GLib_PKG_CFLAGS_OTHER}")

	find_path(GLib_INCLUDE_DIRS "glib.h"
		HINTS ${GLib_PKG_INCLUDE_DIRS}
		PATH_SUFFIXES "glib-2.0")

	get_filename_component(GLib_LIBDIR "${GLib_LIBRARY}" DIRECTORY)
	find_path(GLib_CONFIG_INCLUDE_DIR "glibconfig.h"
		HINTS
		${GLib_LIBDIR}
		${GLib_PKG_INCLUDE_DIRS}
		PATHS
		"${CMAKE_LIBRARY_PATH}"
		PATH_SUFFIXES
		"glib-2.0/include"
		"glib-2.0")
	unset(GLib_LIBDIR)

	if(GLib_CONFIG_INCLUDE_DIR)
		file(STRINGS "${GLib_CONFIG_INCLUDE_DIR}/glibconfig.h" GLib_MAJOR_VERSION REGEX "^#define GLIB_MAJOR_VERSION +([0-9]+)")
		string(REGEX REPLACE "^#define GLIB_MAJOR_VERSION ([0-9]+)$" "\\1" GLib_MAJOR_VERSION "${GLib_MAJOR_VERSION}")
		file(STRINGS "${GLib_CONFIG_INCLUDE_DIR}/glibconfig.h" GLib_MINOR_VERSION REGEX "^#define GLIB_MINOR_VERSION +([0-9]+)")
		string(REGEX REPLACE "^#define GLIB_MINOR_VERSION ([0-9]+)$" "\\1" GLib_MINOR_VERSION "${GLib_MINOR_VERSION}")
		file(STRINGS "${GLib_CONFIG_INCLUDE_DIR}/glibconfig.h" GLib_MICRO_VERSION REGEX "^#define GLIB_MICRO_VERSION +([0-9]+)")
		string(REGEX REPLACE "^#define GLIB_MICRO_VERSION ([0-9]+)$" "\\1" GLib_MICRO_VERSION "${GLib_MICRO_VERSION}")
		set(GLib_VERSION "${GLib_MAJOR_VERSION}.${GLib_MINOR_VERSION}.${GLib_MICRO_VERSION}")
		unset(GLib_MAJOR_VERSION)
		unset(GLib_MINOR_VERSION)
		unset(GLib_MICRO_VERSION)

		list(APPEND GLib_INCLUDE_DIRS ${GLib_CONFIG_INCLUDE_DIR})
		set_property(TARGET ${GLib} PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${GLib_INCLUDE_DIRS}")
	endif()
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GLib
	REQUIRED_VARS
	GLib_LIBRARY
	GLib_INCLUDE_DIRS
	VERSION_VAR
	GLib_VERSION)
