cmake_minimum_required ( VERSION 3.17 )

PROJECT ( RE2 CXX C )
#Parses Makefile and creates the own project based on it
#(actually we only use OFILES var from there)

if (NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/MakefileOrig")
	configure_file ( "${CMAKE_CURRENT_SOURCE_DIR}/Makefile" "${CMAKE_CURRENT_SOURCE_DIR}/MakefileOrig" COPYONLY )
endif ()

FILE ( STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/MakefileOrig" _CONTENT )
FOREACH (LINE ${_CONTENT})
	IF ("${LINE}" MATCHES "^(INSTALL_HFILES|HFILES|OFILES)=")
		STRING ( REPLACE ";" "" LINE "${LINE}" )
		separate_arguments ( SRCLIST UNIX_COMMAND "${LINE}" )
		foreach (SRC ${SRCLIST})
			IF ("${SRC}" MATCHES "=")
				STRING ( REPLACE "=" "" _NAME "${SRC}" )
				set ( ${_NAME} )
			else ()
				LIST ( APPEND ${_NAME} ${SRC} )
			endif ()
		endforeach ()
		if (_NAME STREQUAL "INSTALL_HFILES")
			source_group ( "Install headers" FILES ${INSTALL_HFILES} )
		endif ()
		if (_NAME STREQUAL "HFILES")
			source_group ( "Headers" FILES ${HFILES} )
		endif ()
	endif ()
endforeach ()

if (OFILES)
	set ( SOURCES )
	foreach (OBJ ${OFILES})
		STRING ( REPLACE "obj/" "" OBJ "${OBJ}" )
		get_filename_component ( NAME ${OBJ} NAME_WE )
		get_filename_component ( DIR ${OBJ} DIRECTORY )
		LIST ( APPEND SOURCES "${DIR}/${NAME}.cc" )
	endforeach ()
else (OFILES)
	MESSAGE ( FATAL_ERROR "No OFILE definition found in Makefile" )
endif (OFILES)


# Set a default build type for single-configuration CMake generators if no build type is set.
get_property ( isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG )
if (NOT isMultiConfig AND NOT CMAKE_BUILD_TYPE)
	set ( CMAKE_BUILD_TYPE RelWithDebInfo )
	message ( STATUS "Automatically set build type to RelWithDebInfo since no other provided" )
endif ()

# Select flags.
if (MSVC)
	SET ( CMAKE_CXX_FLAGS_RELWITHDEBINFO "/MD /Zi /O2 /D NDEBUG" )
else ()
	SET ( CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Wall -O3 -g -DNDEBUG" )
endif ()

set ( THREADS_PREFER_PTHREAD_FLAG ON )
find_package ( Threads REQUIRED )

add_library ( re2 ${SOURCES} ${HFILES} ${INSTALL_HFILES} )
target_link_libraries ( re2 PRIVATE Threads::Threads )
target_include_directories ( re2 PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>$<INSTALL_INTERFACE:include> )

if (WIN32)
	target_compile_definitions ( re2 PRIVATE NOMINMAX )
endif ()
target_compile_options ( re2 PRIVATE $<$<COMPILE_LANG_AND_ID:CXX,MSVC>:/Oi -wd4267> )
target_compile_options ( re2 PRIVATE $<$<NOT:$<COMPILE_LANG_AND_ID:CXX,MSVC>>:-Wsign-compare -c> )
target_compile_options ( re2 PRIVATE $<$<COMPILE_LANG_AND_ID:CXX,GNU>:-Wno-class-memaccess -Wno-parentheses> )

set_target_properties ( re2 PROPERTIES
		DEBUG_POSTFIX d
		PDB_NAME re2
		PDB_NAME_DEBUG re2d
		COMPILE_PDB_NAME re2
		COMPILE_PDB_NAME_DEBUG re2d
		)

# installation stuff
set ( CMAKE_CMAKE_DIR "lib/cmake/re2" )

# ensure ALL externally required headers are exported here
install ( FILES ${INSTALL_HFILES} DESTINATION include/re2 )
install ( TARGETS re2 EXPORT Re2Export RUNTIME DESTINATION lib LIBRARY DESTINATION lib )
install ( FILES "$<TARGET_FILE_DIR:re2>/re2$<$<CONFIG:Debug>:d>.pdb" EXPORT Re2Export DESTINATION lib OPTIONAL )

install ( EXPORT Re2Export FILE re2-targets.cmake DESTINATION "${CMAKE_CMAKE_DIR}" NAMESPACE re2:: )
include ( CMakePackageConfigHelpers )
file ( WRITE "re2-config.cmake.in"
		"\@PACKAGE_INIT@

if(NOT TARGET re2::re2)
    include(\"\${CMAKE_CURRENT_LIST_DIR}/re2-targets.cmake\")
    get_target_property ( configs re2::re2 IMPORTED_CONFIGURATIONS )
    foreach (config DEBUG RELEASE MINSIZEREL)
        if (NOT \${config} IN_LIST configs)
            set_property ( TARGET re2::re2 PROPERTY MAP_IMPORTED_CONFIG_\${config} RelWithDebInfo )
        endif ()
    endforeach ()
endif()
" )

configure_package_config_file ( "re2-config.cmake.in"
		"${CMAKE_CURRENT_BINARY_DIR}/re2-config.cmake" INSTALL_DESTINATION "${CMAKE_CMAKE_DIR}" )
install ( FILES "${CMAKE_CURRENT_BINARY_DIR}/re2-config.cmake" DESTINATION "${CMAKE_CMAKE_DIR}" )