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cmake_minimum_required(VERSION 3.15)
include(FetchContent)
# Simple function to abstract fetching a dependency from Git.
# It produces similar output as what libfind_pkg_detect would return:
# - ${PREFIX}_VERSION
# - ${PREFIX}_INCLUDE_DIRS
# - ${PREFIX}_FOUND
# The following attribute are required:
# - PREFIX
# - REPOSITORY <address>: the git repository address
# - REFERENCE <reference>: a git reference for this repository (tag, branch, or hash)
# The following attributes are optional:
# - FIND_PATH <header path>: the path of a file that should be located.
# Eg: libfetch_git_pkg(Json NAME json REPOSITORY https://github.com/performous/json.git REFERENCE master FIND_PATH json/json.hpp)
function (libfetch_git_pkg PREFIX)
# parse arguments
set(argname pkgargs)
foreach(i ${ARGN})
if ("${i}" STREQUAL "REPOSITORY")
set(argname pkgrepository)
elseif ("${i}" STREQUAL "FIND_PATH")
set(argname pkgfindpath)
elseif ("${i}" STREQUAL "REFERENCE")
set(argname pkgreference)
else ()
set(${argname} ${${argname}} ${i})
endif()
endforeach()
string(TOLOWER ${PREFIX}-src pkgname)
if (NOT pkgrepository OR NOT pkgreference)
message(FATAL_ERROR "libfetch_git_pkg requires attributes REPOSITORY and REFERENCE.")
endif()
if (pkgargs)
message(FATAL_ERROR "libfetch_git_pkg requires no extra parameter.")
endif()
message(STATUS "Fetching and making available ${pkgname}...")
set(${PREFIX}_VERSION ${pkgreference} PARENT_SCOPE)
FetchContent_Declare(${pkgname}
GIT_REPOSITORY ${pkgrepository}
GIT_SHALLOW TRUE
GIT_TAG ${pkgreference}
SOURCE_DIR ${pkgname}-src
)
FetchContent_MakeAvailable(${pkgname})
if (pkgfindpath)
find_path(${PREFIX}_INCLUDE_DIR NAMES ${pkgfindpath} HINTS ${${pkgname}_SOURCE_DIR} ${${pkgname}_SOURCE_DIR}/include)
set(${PREFIX}_INCLUDE_DIRS ${${PREFIX}_INCLUDE_DIR} PARENT_SCOPE)
else()
set(${PREFIX}_INCLUDE_DIRS ${${pkgname}_SOURCE_DIR}/include/ PARENT_SCOPE)
endif()
set(${PREFIX}_FOUND TRUE PARENT_SCOPE)
endfunction ()
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