From 0abfdc7a435eb0b60917be62ba6a563147e349eb Mon Sep 17 00:00:00 2001
From: Mateja <mail@matejamaric.com>
Date: Sun, 14 Feb 2021 15:11:39 +0100
Subject: Auto-update git submodules.

---
 CMakeLists.txt | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ca28adf..ba76fa7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,25 @@ set( CMAKE_CXX_STANDARD 17 )
 aux_source_directory(./src/ SRC_LIST)
 add_executable(${PROJECT_NAME} ${SRC_LIST})
 
+find_package(Git QUIET)
+if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
+# Update submodules as needed
+    option(GIT_SUBMODULE "Check submodules during build" ON)
+    if(GIT_SUBMODULE)
+        message(STATUS "Submodule update")
+        execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+                        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                        RESULT_VARIABLE GIT_SUBMOD_RESULT)
+        if(NOT GIT_SUBMOD_RESULT EQUAL "0")
+            message(FATAL_ERROR "git submodule update --init failed with ${GIT_SUBMOD_RESULT}, please checkout submodules")
+        endif()
+    endif()
+endif()
+
+if(NOT EXISTS "${PROJECT_SOURCE_DIR}/external/SFML/CMakeLists.txt")
+    message(FATAL_ERROR "The submodules were not downloaded! GIT_SUBMODULE was turned off or failed. Please update submodules and try again.")
+endif()
+
 add_subdirectory(external/SFML)
 target_include_directories(${PROJECT_NAME} PUBLIC external/SFML/include)
 target_link_directories(${PROJECT_NAME} PUBLIC external/SFML/lib)
-- 
cgit v1.2.3