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#############################################################################
# Copyright (c) 2017 Balabit
# Copyright (c) 2017 Kokan
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# As an additional exemption you are allowed to compile & link against the
# OpenSSL libraries as published by the OpenSSL project. See the file
# COPYING for details.
#
#############################################################################
include(CMakeParseArguments)
function(external_or_find_package LIB_NAME)
cmake_parse_arguments(EXTERNAL_OR_FIND_PACKAGE "REQUIRED" "" "" ${ARGN})
set(${LIB_NAME}_SOURCE "auto" CACHE STRING "${LIB_NAME} library source")
set_property(CACHE ${LIB_NAME}_SOURCE PROPERTY STRINGS internal system auto)
include(External${LIB_NAME} OPTIONAL RESULT_VARIABLE EXT_${LIB_NAME}_PATH)
if (NOT EXISTS ${EXT_${LIB_NAME}_PATH})
set(${LIB_NAME}_INTERNAL FALSE)
endif()
if (${LIB_NAME}_INTERNAL)
set_target_properties(${LIB_NAME} PROPERTIES EXCLUDE_FROM_ALL TRUE)
endif()
if (${${LIB_NAME}_INTERNAL} AND ("internal" STREQUAL ${${LIB_NAME}_SOURCE} OR "auto" STREQUAL ${${LIB_NAME}_SOURCE} ))
message(STATUS "Found ${LIB_NAME}: internal")
set(${LIB_NAME}_FOUND TRUE PARENT_SCOPE)
set(${LIB_NAME}_INCLUDE_DIR "${${LIB_NAME}_INTERNAL_INCLUDE_DIR}" CACHE STRING "${LIB_NAME} include path")
set(${LIB_NAME}_LIBRARY "${${LIB_NAME}_INTERNAL_LIBRARY}" CACHE STRING "${LIB_NAME} library path")
elseif ("system" STREQUAL ${${LIB_NAME}_SOURCE} OR "auto" STREQUAL ${${LIB_NAME}_SOURCE})
if (${EXTERNAL_OR_FIND_PACKAGE_REQUIRED})
find_package(${LIB_NAME} REQUIRED)
else()
find_package(${LIB_NAME} )
endif()
set(${LIB_NAME}_FOUND "${${LIB_NAME}_FOUND}" PARENT_SCOPE)
unset(${LIB_NAME}_INTERNAL)
else()
if (${EXTERNAL_OR_FIND_PACKAGE_REQUIRED})
message(FATAL_ERROR "Library ${LIB_NAME} is mandatory but NOTFOUND")
else()
message(STATUS "Library ${LIB_NAME} is NOTFOUND")
endif()
unset(${LIB_NAME}_INTERNAL)
endif()
if (${LIB_NAME}_INTERNAL)
set(${LIB_NAME}_INTERNAL "${${LIB_NAME}_INTERNAL}" PARENT_SCOPE)
endif()
endfunction()
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