Working model finished

cmake/AddGitSubmodule.cmake

@@ -0,0 +1,39 @@
+function(add_git_submodule relative_dir lib link)
+    find_package(Git REQUIRED)
+
+    set(FULL_DIR ${CMAKE_SOURCE_DIR}/${relative_dir})
+
+    #For intializing git if not already initialized.
+    if(NOT EXISTS "${CMAKE_SOURCE_DIR}/.git")
+        # If .git directory does not exist, execute git init
+        execute_process(
+            COMMAND git init
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+            RESULT_VARIABLE result
+        )
+
+        if(result)
+            message(FATAL_ERROR "Failed to initialize git repository.")
+        endif()
+    endif()
+
+    #For adding the external deps if not added yet
+    if (NOT EXISTS ${FULL_DIR}/${lib})
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE}
+            submodule add -- ${link}
+            WORKING_DIRECTORY ${FULL_DIR}
+        )
+    elseif (NOT EXISTS ${FULL_DIR}/CMakeLists.txt)
+        execute_process(COMMAND ${GIT_EXECUTABLE}
+            submodule update --init  -- ${relative_dir}
+            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
+    endif()
+
+    if (EXISTS ${FULL_DIR}/CMakeLists.txt)
+        message("Submodule is CMake Project: ${FULL_DIR}/CMakeLists.txt")
+        add_subdirectory(${FULL_DIR})
+    else()
+        message("Submodule is NO CMake Project: ${FULL_DIR}")
+    endif()
+endfunction(add_git_submodule)