# # # # sol2
# The MIT License (MIT)
# 
# Copyright (c) 2013-2017 Rapptz, ThePhD, and contributors
# 
# 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.

# import necessary standard modules
include(ExternalProject)


# Latest versions for specific sub-versions of Lua
set(LUA_VANILLA_5.1_LATEST_VERSION 5.1.5)
set(LUA_VANILLA_5.2_LATEST_VERSION 5.2.4)
set(LUA_VANILLA_5.3_LATEST_VERSION 5.3.4)

# exact version, coming from CI: pull directly from Lua and use external project to build
# list of known md5 / sha1: must update when there are changes
set(LUA_VANILLA_MD5_5.3.4 53a9c68bcc0eda58bdc2095ad5cdfc63)
set(LUA_VANILLA_SHA1_5.3.4 79790cfd40e09ba796b01a571d4d63b52b1cd950)
set(LUA_VANILLA_MD5_5.3.3 703f75caa4fdf4a911c1a72e67a27498)
set(LUA_VANILLA_SHA1_5.3.3 a0341bc3d1415b814cc738b2ec01ae56045d64ef)
set(LUA_VANILLA_MD5_5.3.2 33278c2ab5ee3c1a875be8d55c1ca2a1)
set(LUA_VANILLA_SHA1_5.3.2 7a47adef554fdca7d0c5536148de34579134a973)
set(LUA_VANILLA_MD5_5.3.1 797adacada8d85761c079390ff1d9961)
set(LUA_VANILLA_SHA1_5.3.1 1676c6a041d90b6982db8cef1e5fb26000ab6dee)
set(LUA_VANILLA_MD5_5.3.0 a1b0a7e92d0c85bbff7a8d27bf29f8af)
set(LUA_VANILLA_SHA1_5.3.0 1c46d1c78c44039939e820126b86a6ae12dadfba)
set(LUA_VANILLA_MD5_5.2.4 913fdb32207046b273fdb17aad70be13)
set(LUA_VANILLA_SHA1_5.2.4 ef15259421197e3d85b7d6e4871b8c26fd82c1cf)
set(LUA_VANILLA_MD5_5.2.3 dc7f94ec6ff15c985d2d6ad0f1b35654)
set(LUA_VANILLA_SHA1_5.2.3 926b7907bc8d274e063d42804666b40a3f3c124c)
set(LUA_VANILLA_MD5_5.2.2 efbb645e897eae37cad4344ce8b0a614)
set(LUA_VANILLA_SHA1_5.2.2 0857e41e5579726a4cb96732e80d7aa47165eaf5)
set(LUA_VANILLA_MD5_5.2.1 ae08f641b45d737d12d30291a5e5f6e3)
set(LUA_VANILLA_SHA1_5.2.1 6bb1b0a39b6a5484b71a83323c690154f86b2021)
set(LUA_VANILLA_MD5_5.2.0 f1ea831f397214bae8a265995ab1a93e)
set(LUA_VANILLA_SHA1_5.2.0 08f84c355cdd646f617f09cebea48bd832415829)
set(LUA_VANILLA_MD5_5.1.5 2e115fe26e435e33b0d5c022e4490567)
set(LUA_VANILLA_SHA1_5.1.5 b3882111ad02ecc6b972f8c1241647905cb2e3fc)
set(LUA_VANILLA_MD5_5.1.4 d0870f2de55d59c1c8419f36e8fac150)
set(LUA_VANILLA_SHA1_5.1.4 2b11c8e60306efb7f0734b747588f57995493db7)
set(LUA_VANILLA_MD5_5.1.3 a70a8dfaa150e047866dc01a46272599)
set(LUA_VANILLA_SHA1_5.1.3 89bc9f5a351402565b8077e8123327e7cd15f004)
set(LUA_VANILLA_MD5_5.1.2 687ce4c2a1ddff18f1008490fdc4e5e0)
set(LUA_VANILLA_SHA1_5.1.2 8a460d2d7e70e93cb72bf3d584405464763cb5f0)
set(LUA_VANILLA_MD5_5.1.1 22f4f912f20802c11006fe9b84d5c461)
set(LUA_VANILLA_SHA1_5.1.1 be13878ceef8e1ee7a4201261f0adf09f89f1005)
set(LUA_VANILLA_MD5_5.1 3e8dfe8be00a744cec2f9e766b2f2aee)
set(LUA_VANILLA_SHA1_5.1 1ae9ec317511d525c7999c842ca0b1ddde84e374)
set(LUA_VANILLA_MD5_5.0.3 feee27132056de2949ce499b0ef4c480)
set(LUA_VANILLA_SHA1_5.0.3 e7e91f78b8a8deb09b13436829bed557a46af8ae)
set(LUA_VANILLA_MD5_5.0.2 dea74646b7e5c621fef7174df83c34b1)
set(LUA_VANILLA_SHA1_5.0.2 a200cfd20a9a4c7da1206ae45dddf26186a9e0e7)
set(LUA_VANILLA_MD5_5.0.1 e0a450d84971a3f4563b98172d1e382c)
set(LUA_VANILLA_SHA1_5.0.1 03b47b4785178aca583333f01d8726a8ab9f7ae7)
set(LUA_VANILLA_MD5_5.0 6f14803fad389fb1cb15d17edfeddd91)
set(LUA_VANILLA_SHA1_5.0 88b1bc057857c0db5ace491c4af2c917a2b803bf)
set(LUA_VANILLA_MD5_4.0.1 a31d963dbdf727f9b34eee1e0d29132c)
set(LUA_VANILLA_SHA1_4.0.1 12f1864a7ecd4b8011862a07fa3f177b2e80e7d3)
set(LUA_VANILLA_MD5_4.0 be11522d46d33a931868c03694aaeeef)
set(LUA_VANILLA_SHA1_4.0 8d432c73ef6e98b81d252114be1a83182cc9607a)
set(LUA_VANILLA_MD5_3.2.2 374ba5c4839709922de40b8d10382705)
set(LUA_VANILLA_SHA1_3.2.2 fa50ff14c00d8523c8a3d1d3f4887ecc4400d0c3)
set(LUA_VANILLA_MD5_3.2.1 47264a1978df49fc1dea6ffcddb05b21)
set(LUA_VANILLA_SHA1_3.2.1 d43af5a1c7a65c0ddb4b0ac06c29ecf4cdd22367)
set(LUA_VANILLA_MD5_3.2 a6552da3d40ae9b04489a788262279e8)
set(LUA_VANILLA_SHA1_3.2 84cf9f0e7d00eed3ea8b4ac2b84254b714510b34)
set(LUA_VANILLA_MD5_3.1 d677f3827167eefdefc7b211397cfdfb)
set(LUA_VANILLA_SHA1_3.1 509485e3baafd946f4ffe2a984f8a63746adc32a)
set(LUA_VANILLA_MD5_3.0 997558ae76c2f1cd1e10fd3835c45c6a)
set(LUA_VANILLA_SHA1_3.0 5c8c910353f717ba29b4fe7d538994454229b335)
set(LUA_VANILLA_MD5_2.5 da915d58904e75b9b0fc18147e19b0bb)
set(LUA_VANILLA_SHA1_2.5 7920e12c40242932c22fa261ff114cc485a39d99)
set(LUA_VANILLA_MD5_2.4 5d035cc244285c1dbbcaaa0908b58965)
set(LUA_VANILLA_SHA1_2.4 74036935b36e6ae4ed17bd7a9408154f9a4a6b17)
set(LUA_VANILLA_MD5_2.2 a298b58e197ff8168ec907d6145252ef)
set(LUA_VANILLA_SHA1_2.2 2d8b1df94b2fb76f0f16ca1ddc54d5186b10df4b)
set(LUA_VANILLA_MD5_2.1 053a9f6728cc56f6a23716a6a1ede595)
set(LUA_VANILLA_SHA1_2.1 b9a797547f480bcb58b5d3da846c8ac8d2201df0)
set(LUA_VANILLA_MD5_1.1 9f83141cc8ea362497e272071eda5cf6)
set(LUA_VANILLA_SHA1_1.1 67209701eec5cc633e829d023fbff62d5d6c8e5e)
set(LUA_VANILLA_MD5_1.0 96e8399fc508d128badd8ac3aa8f2119)
set(LUA_VANILLA_SHA1_1.0 6a82d2ae7ce9ad98c7b4824a325b91522c0d6ebb)

# Clean up some variables
if (LUA_VERSION MATCHES "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$")
	# probably okay!
	set(LUA_VANILLA_VERSION ${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3})
elseif (LUA_VERSION MATCHES "([0-9]+)\\.([0-9]+)")
	# extend version number with prefix
	if (${CMAKE_MATCH_1} EQUAL 5)
		if (${CMAKE_MATCH_2} EQUAL 1)
			set(LUA_VANILLA_VERSION LUA_VANILLA_5.1_LATEST_VERSION)
		elseif (${CMAKE_MATCH_2} EQUAL 2)
			set(LUA_VANILLA_VERSION LUA_VANILLA_5.2_LATEST_VERSION)
		elseif (${CMAKE_MATCH_2} EQUAL 3)
			set(LUA_VANILLA_VERSION LUA_VANILLA_5.3_LATEST_VERSION)
		else()			
			# default to whatever the first two
			# numbers happen to be, plus build 0
			set(LUA_VANILLA_VERSION ${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.0)
		endif()
	endif()
	if(NOT LUA_VANILLA_VERSION)			
		# default to whatever the first two
		# numbers happen to be, plus build 0
		set(LUA_VANILLA_VERSION ${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.0)
	endif()
else()
	message(FATAL "Cannot deduce the proper Lua version from ${LUA_VERSION}")
endif()

message(STATUS "Selecting PUC-RIO Lua ${LUA_VANILLA_VERSION} from '${LUA_VERSION}' and building a ${LUA_BUILD_LIBRARY_TYPE} library...")

# Get Hashes to use for download
set(LUA_VANILLA_SHA1 ${LUA_VANILLA_SHA1_${LUA_VANILLA_VERSION}})
set(LUA_VANILLA_MD5 ${LUA_VANILLA_MD5_${LUA_VANILLA_VERSION}})

if (LUA_VANILLA_MD5)
	set(LUA_VANILLA_DOWNLOAD_MD5_COMMAND URL_MD5 ${LUA_VANILLA_MD5})
else ()
	set(LUA_VANILLA_DOWNLOAD_MD5_COMMAND "")
endif()
if (LUA_VANILLA_SHA1)
	set(LUA_VANILLA_DOWNLOAD_SHA1_COMMAND URL_HASH SHA1=${LUA_VANILLA_SHA1})
else ()
	set(LUA_VANILLA_DOWNLOAD_SHA1_COMMAND "")
endif()

function(prepend var prefix)
   set(l "")
   foreach(f ${ARGN})
      list(APPEND l "${prefix}${f}")
   endforeach(f)
   SET(${var} "${l}" PARENT_SCOPE)
ENDFUNCTION(prepend)

# # # Makefile and self-build configurations

# # Final outputs for lib and dll files in the case we're using the makefile directly
set(LUA_VANILLA_LIB_FILE "${LUA_LIB_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${LUA_LIBRARY}${CMAKE_STATIC_LIBRARY_SUFFIX}")
set(LUA_VANILLA_DLL_FILE "${LUA_BIN_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}${LUA_LIBRARY}${CMAKE_SHARED_LIBRARY_SUFFIX}")
if (BUILD_LUA_AS_DLL)
	set(LUA_VANILLA_BYPRODUCTS ${LUA_VANILLA_LIB_FILE} ${LUA_VANILLA_DLL_FILE})
else()
	set(LUA_VANILLA_BYPRODUCTS ${LUA_VANILLA_LIB_FILE})
endif()

# # Potential compiler variables
if (MSVC)
	set(LUA_VANILLA_LUA_LUAC_COMPILER_OPTIONS "")
	if (BUILD_LUA_AS_DLL)
		set(LUA_VANILLA_DLL_DEFINE LUA_BUILD_AS_DLL)
	else()
		set(LUA_VANILLA_DLL_DEFINE "")
	endif()
else()
	set(LUA_VANILLA_LUALIB_COMPILER_OPTIONS "")
	set(LUA_VANILLA_DLL_DEFINE "")
endif()

# # Source files for natural build, if we have to go that far
# retrieve source files
if (LUA_VANILLA_VERSION MATCHES "^5.1")
	set(LUA_VANILLA_LIB_SOURCES lapi.c lcode.c ldebug.c ldo.c ldump.c lfunc.c 
		lgc.c llex.c lmem.c lobject.c lopcodes.c lparser.c lstate.c 
		lstring.c ltable.c ltm.c lundump.c lvm.c lzio.c lauxlib.c 
		lbaselib.c ldblib.c liolib.c lmathlib.c loslib.c ltablib.c 
		lstrlib.c linit.c)
	set(LUA_VANILLA_LUA_SOURCES lua.c )
	set(LUA_VANILLA_LUAC_SOURCES luac.c print.c )
elseif (LUA_VANILLA_VERSION MATCHES "^5.2")
	set(LUA_VANILLA_LIB_SOURCES lapi.c lcode.c lctype.c ldebug.c ldo.c ldump.c 
		lfunc.c lgc.c llex.c lmem.c lobject.c lopcodes.c lparser.c 
		lstate.c lstring.c ltable.c ltm.c lundump.c lvm.c lzio.c
		lauxlib.c lbaselib.c lbitlib.c lcorolib.c ldblib.c 
		liolib.c lmathlib.c loslib.c lstrlib.c ltablib.c linit.c)
	set(LUA_VANILLA_LUA_SOURCES lua.c )
	set(LUA_VANILLA_LUAC_SOURCES luac.c )
else()
	if (NOT LUA_VANILLA_VERSION MATCHES "^5.3")
		message(STATUS "Using the Lua 5.3 sources list for a version of Lua that is not 5.3: may result in an incomplete build or errors later")
	endif()
	set(LUA_VANILLA_LIB_SOURCES lapi.c lcode.c lctype.c ldebug.c ldo.c ldump.c 
		lfunc.c lgc.c llex.c lmem.c lobject.c lopcodes.c lparser.c lstate.c 
		lstring.c ltable.c ltm.c lundump.c lvm.c lzio.c lauxlib.c 
		lbaselib.c lbitlib.c lcorolib.c ldblib.c liolib.c lmathlib.c 
		loslib.c lstrlib.c ltablib.c lutf8lib.c loadlib.c linit.c)
	set(LUA_VANILLA_LUA_SOURCES lua.c )
	set(LUA_VANILLA_LUAC_SOURCES luac.c )
endif()

if (BUILD_LUA_AS_DLL)
	set(LUA_VANILLA_LUAC_SOURCES ${LUA_VANILLA_LUAC_SOURCES} ${LUA_VANILLA_LIB_SOURCES})
endif()

set(LUA_VANILLA_SOURCE_DIR "${LUA_BUILD_TOPLEVEL}/src")
prepend(LUA_VANILLA_LIB_SOURCES "${LUA_VANILLA_SOURCE_DIR}/" ${LUA_VANILLA_LIB_SOURCES})
prepend(LUA_VANILLA_LUA_SOURCES "${LUA_VANILLA_SOURCE_DIR}/" ${LUA_VANILLA_LUA_SOURCES})
prepend(LUA_VANILLA_LUAC_SOURCES "${LUA_VANILLA_SOURCE_DIR}/" ${LUA_VANILLA_LUAC_SOURCES})
STRING(REGEX REPLACE "\\.c" ${LUA_BUILD_OBJECT_FILE_SUFFIX} LUA_VANILLA_LIB_OBJECTS ${LUA_VANILLA_LIB_SOURCES})
STRING(REGEX REPLACE "\\.c" ${LUA_BUILD_OBJECT_FILE_SUFFIX} LUA_VANILLA_LUA_OBJECTS ${LUA_VANILLA_LUA_SOURCES})
STRING(REGEX REPLACE "\\.c" ${LUA_BUILD_OBJECT_FILE_SUFFIX} LUA_VANILLA_LUAC_OBJECTS ${LUA_VANILLA_LUAC_SOURCES})

if (WIN32 OR MSVC OR BUILD_LUA_AS_DLL)
	set(LUA_VANILLA_BUILD_DIRECTLY TRUE)
else()
	set(LUA_VANILLA_BUILD_DIRECTLY FALSE)
endif()

# download, just for the sake of download + extract
# we can get additional mileage if we're just doing the static build...
if (LUA_VANILLA_BUILD_DIRECTLY)
	# have to use 2 different commands just to have an empty command
	# that results in nothing being run
	# TODO: talk to smarter CMake people...?

	ExternalProject_Add(LUA_VANILLA
		BUILD_IN_SOURCE TRUE
		BUILD_ALWAYS TRUE
		TLS_VERIFY TRUE
		PREFIX ${LUA_BUILD_TOPLEVEL}
		SOURCE_DIR ${LUA_BUILD_TOPLEVEL}
		DOWNLOAD_DIR ${LUA_BUILD_TOPLEVEL}
		TMP_DIR "${LUA_BUILD_TOPLEVEL}-tmp"
		STAMP_DIR "${LUA_BUILD_TOPLEVEL}-stamp"
		INSTALL_DIR "${LUA_BUILD_INSTALL_DIR}"
		URL https://www.lua.org/ftp/lua-${LUA_VANILLA_VERSION}.tar.gz
		URL_MD5 ${LUA_VANILLA_MD5}
		URL_HASH SHA1=${LUA_VANILLA_SHA1}
		CONFIGURE_COMMAND ""
		BUILD_COMMAND ""
		INSTALL_COMMAND ""
		TEST_COMMAND ""
		BUILD_BYPRODUCTS ${LUA_VANILLA_BYPRODUCTS} "${LUA_VANILLA_LIB_SOURCES}" "${LUA_VANILLA_LUA_SOURCES}" "${LUA_VANILLA_LUAC_SOURCES}")
else()
	# targets if we're building using the makefile
	if (MINGW)
		set(LUA_VANILLA_MAKE_TARGET generic)
	elseif(APPLE)
		set(LUA_VANILLA_MAKE_TARGET macosx)
	elseif(UNIX AND NOT APPLE)
		set(LUA_VANILLA_MAKE_TARGET linux)
	else()
		set(LUA_VANILLA_MAKE_TARGET generic)
	endif()

	set(LUA_VANILLA_LIBNAME ${CMAKE_STATIC_LIBRARY_PREFIX}${LUA_LIBRARY}${CMAKE_STATIC_LIBRARY_SUFFIX})
	set(LUA_VANILLA_MAKE_MODIFICATIONS TO_LIB="${LUA_VANILLA_LIBNAME}" LUA_A="${LUA_VANILLA_LIBNAME}" SYSCFLAGS=-DLUA_COMPAT_ALL)
	set(LUA_VANILLA_MAKE_INSTALL_TOOL "copy /B /Y")
	set(LUA_VANILLA_MAKE_INSTALL_TOP "${LUA_BUILD_INSTALL_DIR}")
	set(LUA_VANILLA_MAKE_INSTALL_BIN "${LUA_BIN_DIR}")
	set(LUA_VANILLA_MAKE_INSTALL_INC "${LUA_INCLUDE_DIR}")
	set(LUA_VANILLA_MAKE_INSTALL_LIB "${LUA_LIB_DIR}") 
	set(LUA_VANILLA_MAKE_INSTALL_MAN "${LUA_BUILD_INSTALL_DIR}/man/man1") 
	set(LUA_VANILLA_MAKE_INSTALL_LMOD "${LUA_BUILD_INSTALL_DIR}/share/lua/$V") 
	set(LUA_VANILLA_MAKE_INSTALL_CMOD "${LUA_BUILD_INSTALL_DIR}/lib/lua/$V")
	file(TO_NATIVE_PATH  "${LUA_VANILLA_MAKE_INSTALL_TOP}" LUA_VANILLA_MAKE_INSTALL_TOP)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_BIN}" LUA_VANILLA_MAKE_INSTALL_BIN)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_INC}" LUA_VANILLA_MAKE_INSTALL_INC)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_LIB}" LUA_VANILLA_MAKE_INSTALL_LIB)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_MAN}" LUA_VANILLA_MAKE_INSTALL_MAN)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_LMOD}" LUA_VANILLA_MAKE_INSTALL_LMOD)
	file(TO_NATIVE_PATH "${LUA_VANILLA_MAKE_INSTALL_CMOD}" LUA_VANILLA_MAKE_INSTALL_CMOD)
	if (WIN32)
		# powershell invokes too many rules and stupid errors,
		# and mkdir freaks out when the directory exists because it doesn't have a -p options
		# all in all, windows cmd tools SUCK
		# set(LUA_VANILLA_MAKE_MKDIR_TOOL "powershell -c New-Item -ItemType directory -force -Name")
		#set(LUA_VANILLA_MAKE_MKDIR_TOOL "powershell -c New-Item -ItemType directory -force -Name")
		set(LUA_VANILLA_MAKE_MKDIR_TOOL "mkdir")
		set(LUA_VANILLA_MAKE_MODIFICATIONS ${LUA_VANILLA_MAKE_MODIFICATIONS} RM=del MKDIR=${LUA_VANILLA_MAKE_MKDIR_TOOL})
		set(LUA_VANILLA_MAKE_MODIFICATIONS ${LUA_VANILLA_MAKE_MODIFICATIONS} INSTALL="${LUA_VANILLA_MAKE_INSTALL_TOOL}" INSTALL_EXEC="${LUA_VANILLA_MAKE_INSTALL_TOOL}" INSTALL_DATA="${LUA_VANILLA_MAKE_INSTALL_TOOL}")
	endif()
	set(LUA_VANILLA_MAKE_MODIFICATIONS ${LUA_VANILLA_MAKE_MODIFICATIONS} INSTALL_TOP="${LUA_VANILLA_MAKE_INSTALL_TOP}" INSTALL_BIN="${LUA_VANILLA_MAKE_INSTALL_BIN}" INSTALL_INC="${LUA_VANILLA_MAKE_INSTALL_INC}" INSTALL_LIB="${LUA_VANILLA_MAKE_INSTALL_LIB}" INSTALL_MAN="${LUA_VANILLA_MAKE_INSTALL_MAN}" INSTALL_LMOD="${LUA_VANILLA_MAKE_INSTALL_LMOD}" INSTALL_CMOD="${LUA_VANILLA_MAKE_INSTALL_CMOD}")

	set(LUA_VANILLA_BUILD_COMMAND make ${LUA_VANILLA_MAKE_TARGET} ${LUA_VANILLA_MAKE_MODIFICATIONS})
	set(LUA_VANILLA_INSTALL_COMMAND make install ${LUA_VANILLA_MAKE_MODIFICATIONS})
	set(LUA_VANILLA_TEST_COMMAND make test ${LUA_VANILLA_MAKE_MODIFICATIONS})

	ExternalProject_Add(LUA_VANILLA
		BUILD_IN_SOURCE TRUE
		BUILD_ALWAYS TRUE
		TLS_VERIFY TRUE
		PREFIX ${LUA_BUILD_TOPLEVEL}
		SOURCE_DIR ${LUA_BUILD_TOPLEVEL}
		DOWNLOAD_DIR ${LUA_BUILD_TOPLEVEL}
		TMP_DIR "${LUA_BUILD_TOPLEVEL}-tmp"
		STAMP_DIR "${LUA_BUILD_TOPLEVEL}-stamp"
		INSTALL_DIR "${LUA_BUILD_INSTALL_DIR}"
		URL https://www.lua.org/ftp/lua-${LUA_VANILLA_VERSION}.tar.gz
		URL_MD5 ${LUA_VANILLA_MD5}
		URL_HASH SHA1=${LUA_VANILLA_SHA1}
		CONFIGURE_COMMAND ""
		BUILD_COMMAND ${LUA_VANILLA_BUILD_COMMAND}
		INSTALL_COMMAND ${LUA_VANILLA_INSTALL_COMMAND}
		TEST_COMMAND ${LUA_VANILLA_TEST_COMMAND}
		BUILD_BYPRODUCTS ${LUA_VANILLA_BYPRODUCTS} "${LUA_VANILLA_LIB_SOURCES}" "${LUA_VANILLA_LUA_SOURCES}" "${LUA_VANILLA_LUAC_SOURCES}")
endif()


# # Target names
set(lualib "lualib_${LUA_VANILLA_VERSION}")
set(luainterpreter "lua_${LUA_VANILLA_VERSION}")
set(luacompiler "luac_${LUA_VANILLA_VERSION}")

if (LUA_VANILLA_BUILD_DIRECTLY)
	# Lua does not out-of-the-box support building 
	# a shared library: http://lua-users.org/lists/lua-l/2006-10/msg00098.html
	# in this case, we essentially need to
	# build Lua for our purposes, which is annoying
	# the external project is just a dummy to get and extract the file:
	# after that, we define actual targets...!

	# make an actual, buildable target
	# that other parts of the code can depend on
	add_library(${lualib} ${LUA_BUILD_LIBRARY_TYPE} "${LUA_VANILLA_LIB_SOURCES}")
	set_target_properties(${lualib}
		PROPERTIES
		LANGUAGE C
		LINKER_LANGUAGE C
		C_STANDARD 99
		C_EXTENSIONS TRUE
		POSITION_INDEPENDENT_CODE TRUE
		INCLUDE_DIRECTORIES ${LUA_VANILLA_SOURCE_DIR}
		RUNTIME_OUTPUT_DIRECTORY ${LUA_BIN_DIR}
		LIBRARY_OUTPUT_DIRECTORY ${LUA_BIN_DIR}
		ARCHIVE_OUTPUT_DIRECTORY ${LUA_LIB_DIR}
		OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		RUNTIME_OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		LIBRARY_OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		ARCHIVE_OUTPUT_NAME ${LUA_BUILD_LIBNAME})
	target_include_directories(${lualib}
		PRIVATE ${LUA_VANILLA_SOURCE_DIR}
		PUBLIC ${LUA_VANILLA_SOURCE_DIR})
	target_compile_definitions(${lualib}
		PUBLIC LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE}
		PRIVATE LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE})
	if (WIN32)
		#target_compile_definitions(${lualib} 
		#	PRIVATE LUA_USE_WINDOWS)
	else()
		target_compile_definitions(${lualib} 
			PRIVATE LUA_USE_LINUX)
	endif()
	target_compile_options(${lualib}
		PRIVATE ${LUA_VANILLA_LUALIB_COMPILER_OPTIONS})
	add_dependencies(${lualib} LUA_VANILLA)
	if (CMAKE_DL_LIBS)
		target_link_libraries(${lualib} ${CMAKE_DL_LIBS})
	endif()
	if (UNIX)
		target_link_libraries(${lualib} m)
	endif()

	# we don't really need this section...
	# Lua Interpreter
	add_executable(${luainterpreter} ${LUA_VANILLA_LUA_SOURCES})
	set_target_properties(${luainterpreter}
		PROPERTIES
		LANGUAGE C
		LINKER_LANGUAGE C
		C_STANDARD 99
		C_EXTENSIONS TRUE
		OUTPUT_NAME lua-${LUA_VANILLA_VERSION})
	target_include_directories(${luainterpreter}
		PRIVATE ${LUA_VANILLA_SOURCE_DIR})
	target_compile_definitions(${luainterpreter}
		PUBLIC LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE}
		PRIVATE LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE})
	if (WIN32)
		#target_compile_definitions(${luainterpreter} 
		#	PRIVATE LUA_USE_WINDOWS)
	else()
		target_compile_definitions(${luainterpreter} 
			PRIVATE LUA_USE_LINUX)
	endif()
	target_compile_options(${luainterpreter}
		PRIVATE ${LUA_VANILLA_LUA_LUAC_COMPILER_OPTIONS})
	target_link_libraries(${luainterpreter} ${lualib})
	if (CMAKE_DL_LIBS)
		target_link_libraries(${luainterpreter} ${CMAKE_DL_LIBS})
	endif()
	if (UNIX)
		target_link_libraries(${luainterpreter} m readline)
	endif()

	# LuaC Compiler
	add_executable(${luacompiler} ${LUA_VANILLA_LUAC_SOURCES} ${LUA_VANILLA_LIB_SOURCES})
	set_target_properties(${luacompiler}
		PROPERTIES
		LANGUAGE C
		LINKER_LANGUAGE C
		C_STANDARD 99
		C_EXTENSIONS TRUE
		OUTPUT_NAME luac-${LUA_VANILLA_VERSION})
	target_include_directories(${luacompiler}
		PRIVATE ${LUA_VANILLA_SOURCE_DIR})
	target_compile_options(${luacompiler}
		PRIVATE ${LUA_VANILLA_LUA_LUAC_COMPILER_OPTIONS})
	target_compile_definitions(${luacompiler}
		PUBLIC LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE}
		PRIVATE LUA_COMPAT_ALL ${LUA_VANILLA_DLL_DEFINE})
	if (WIN32)
		#target_compile_definitions(${luacompiler} 
		#	PRIVATE LUA_USE_WINDOWS)
	else()
		target_compile_definitions(${luacompiler} 
			PRIVATE LUA_USE_LINUX)
	endif()
	target_link_libraries(${luacompiler} ${lualib})
	if (CMAKE_DL_LIBS)
		target_link_libraries(${luacompiler} ${CMAKE_DL_LIBS})
	endif()
	if (UNIX)
		target_link_libraries(${luacompiler} m readline)
	endif()

	# set externally-visible target indicator
	set(LUA_LIBRARIES ${lualib})
else ()
	# the proper build/install/test commands have generated the library for us
	# note that this only works for static libs (see above comment under other branch)
	add_library(${lualib} ${LUA_BUILD_LIBRARY_TYPE} IMPORTED)
	set_target_properties(lualib_${LUA_VANILLA_VERSION}
		PROPERTIES 
		LANGUAGE C
		LINKER_LANGUAGE C
		INCLUDE_DIRECTORIES ${LUA_INCLUDE_DIR}
		RUNTIME_OUTPUT_DIRECTORY ${LUA_BIN_DIR}
		LIBRARY_OUTPUT_DIRECTORY ${LUA_LIB_DIR}
		ARCHIVE_OUTPUT_DIRECTORY ${LUA_LIB_DIR}
		RUNTIME_OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		LIBRARY_OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		ARCHIVE_OUTPUT_NAME ${LUA_BUILD_LIBNAME}
		IMPORTED_LOCATION ${LUA_VANILLA_LIB_FILE}
		IMPORTED_SONAME ${LUA_VANILLA_DLL_FILE})
	
	# make sure the library we export really does depend on Lua
	add_dependencies(${lualib} LUA_VANILLA)
	
	# set externally-visible target indicator
	set(LUA_LIBRARIES ${lualib})		
endif()

set(LUA_FOUND TRUE)