Initial commit with first draft

README.md

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+# Git Module Manager for CMake
+
+A simple function which clones a git repository and includes it's CMake project
+
+## Usage
+
+1. download the file module-manager.cmake
+2. include the file in your CMakeLists.txt
+
+``include(module-manager.cmake)
+
+load_module(TestModule SOURCE "http://git.fritz.box/Patrick/cmake-module-manager.git" UPDATE)``

module-manager.cmake

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+cmake_minimum_required(VERSION 3.16)
+
+function(load_module MODULE_NAME)
+	set(keyword_optional_args UPDATE RECURSIVE)
+	set(keyword_single_arg_args SOURCE DESTINATION VERSION)
+	set(keyword_multi_arg_args)
+
+	cmake_parse_arguments(LOAD_MODULE ${keyword_optional_args} ${keyword_single_arg_args} ${keyword_multi_arg_args} ${ARGN})
+	
+	if (NOT LOAD_MODULE_DESTINATION)
+		set(LOAD_MODULE_DESTINATION "${CMAKE_CURRENT_LIST_DIR}/modules")
+	endif()
+	
+	if (LOAD_MODULE_VERSION)
+		set(MODULE_DIR_NAME "${MODULE_NAME}-${LOAD_MODULE_VERSION}")
+	else()
+		set(MODULE_DIR_NAME ${MODULE_NAME})
+	endif()
+	
+	set(MODULE_PATH "${LOAD_MODULE_DESTINATION}/${MODULE_DIR_NAME}")
+	
+	message(CHECK_START "Loading module ${MODULE_NAME}")
+
+	if (EXISTS ${MODULE_PATH})
+		message(CHECK_PASS "Module already installed")
+
+		if (LOAD_MODULE_UPDATE)
+			message(CHECK_START "Updating Module ${MODULE_NAME}")
+			execute_process(
+				COMMAND git pull 
+				WORKING_DIRECTORY ${MODULE_PATH}
+				RESULT_VARIABLE GIT_PULL_RESULT)
+
+			if (GIT_PULL_RESULT EQUAL 0)
+				message(CHECK_PASS "successful")
+			else()
+				message(CHECK_FAIL "failed")
+			endif()
+		endif()
+	else()
+	
+		message(CHECK_FAIL "Module not installed")
+		message(CHECK_START "Downloading module ${MODULE_NAME}")
+		
+		# Create module destination directory
+		file(MAKE_DIRECTORY ${LOAD_MODULE_DESTINATION})
+		execute_process(
+			COMMAND git clone ${LOAD_MODULE_SOURCE} ${MODULE_NAME} 
+			WORKING_DIRECTORY ${LOAD_MODULE_DESTINATION}
+			RESULT_VARIABLE GIT_CLONE_RESULT)
+
+		if (GIT_CLONE_RESULT EQUAL 0)
+			message(CHECK_PASS "successful")
+		else()
+			message(CHECK_FAIL "failed")
+			message(SEND_ERROR "Failed to load module ${MODULE_NAME}")
+
+			return()
+		endif()
+
+	endif()
+	
+	add_subdirectory(${MODULE_PATH})
+
+endfunction()
+