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# Adds a target that downloads an archive containing binary files that should be part of game distribution but are not
# part of the version control system. For example:
#
# add_downloadable_resource(
# resource_shatter
# ARCHIVE shatter.tar.xz
# DIRECTORY shatter.d
# BASE_URL https://ftp.ignore.pl/starshatter/resource/latest
# SHA1 bbed14649213a45499e0a158142f19fd619a54af
# )
#
# Will download 'shatter.tar.xz' from 'https://ftp.ignore.pl/starshatter/resouce/latest' and unpack it into 'shatter.d'
# subdirectory under respective binary directory. The archive will be validated for correctness with SHA1.
#
# Selected options provide default arguments:
# * ARCHIVE defaults to '<target_name>.tar.xz'
# * DIRECTORY defaults to '<target_name>.d'
# * BASE_URL defaults to 'https://ftp.ignore.pl/starshatter/resource/latest'
#
# ALL flag can be specified to include resource target in default build target.
#
# Targets are designed to be used with AddDatafile targets via their RESOURCES option:
#
# add_downloadable_resource(resource_shatter ...)
# add_datafile(
# shatter
# RESOURCES resource_shatter
# )
#
# This will automatically make the datafile generated by 'shatter' target to include files downloaded by
# 'resource_shatter'.
#
# Downloaded archives are not cleaned by default to avoid unnecessarily long build times. Instead they need to be
# cleaned explicitly either by removing them manually or by running 'clean_downloaded_<target_name>' target.
set(ADD_DOWNLOADABLE_RESOURCE_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/download_resource.cmake.in)
function(add_downloadable_resource RESOURCE_TARGET)
cmake_parse_arguments(
PARSE_ARGV 1
RESOURCE
"ALL"
"ARCHIVE;DIRECTORY;BASE_URL;SHA1"
""
)
if(RESOURCE_ALL)
set(RESOURCE_ALL_ARG ALL)
endif()
if(NOT DEFINED RESOURCE_ARCHIVE)
set(RESOURCE_ARCHIVE ${RESOURCE_TARGET}.tar.xz)
endif()
if(NOT DEFINED RESOURCE_BASE_URL)
set(RESOURCE_BASE_URL https://ftp.ignore.pl/starshatter/resources/latest)
endif()
if(NOT DEFINED RESOURCE_DIRECTORY)
set(RESOURCE_DIRECTORY ${RESOURCE_TARGET}.d)
endif()
cmake_path(ABSOLUTE_PATH RESOURCE_ARCHIVE NORMALIZE BASE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
cmake_path(ABSOLUTE_PATH RESOURCE_DIRECTORY NORMALIZE BASE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
cmake_path(GET RESOURCE_ARCHIVE FILENAME RESOURCE_ARCHIVE_BASENAME)
string(REGEX REPLACE "/$" "" RESOURCE_BASE_URL "${RESOURCE_BASE_URL}")
set(DOWNLOAD_SCRIPT ${CMAKE_CURRENT_BINARY_DIR}/download_${RESOURCE_TARGET}.cmake)
configure_file(${ADD_DOWNLOADABLE_RESOURCE_SCRIPT} ${DOWNLOAD_SCRIPT} @ONLY)
add_custom_target(
download_${RESOURCE_TARGET}
COMMENT "Downloading ${RESOURCE_TARGET}"
COMMAND ${CMAKE_COMMAND} -P ${DOWNLOAD_SCRIPT}
)
add_custom_target(
clean_downloaded_${RESOURCE_TARGET}
COMMENT "Removing downloaded ${RESOURCE_TARGET}"
COMMAND ${CMAKE_COMMAND} -E rm -f ${RESOURCE_ARCHIVE}
COMMAND ${CMAKE_COMMAND} -E remove_directory ${RESOURCE_DIRECTORY}
)
add_custom_command(
OUTPUT ${RESOURCE_DIRECTORY}
DEPENDS download_${RESOURCE_TARGET} ${RESOURCE_ARCHIVE}
COMMENT "Unpacking ${RESOURCE_TARGET}"
COMMAND ${CMAKE_COMMAND} -E make_directory ${RESOURCE_DIRECTORY}
COMMAND
${CMAKE_COMMAND} -E chdir ${RESOURCE_DIRECTORY}
${CMAKE_COMMAND} -E tar xf ${RESOURCE_ARCHIVE}
)
add_custom_target(${RESOURCE_TARGET} ${RESOURCE_ALL_ARG} DEPENDS ${RESOURCE_DIRECTORY})
set_property(
TARGET ${RESOURCE_TARGET}
PROPERTY RESOURCE_DIRECTORY ${RESOURCE_DIRECTORY}
)
endfunction()
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