Refactoring Cmake

cleaning up the Cmake code

cmake/git_update_submodules.cmake

@@ -0,0 +1,35 @@
+# Copyright 2006 The QElectroTech Team
+# This file is part of QElectroTech.
+#
+# QElectroTech is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# QElectroTech is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
+
+message(" - git_update_submodules")
+
+find_package(Git QUIET)
+
+if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
+  # updates all git submodules
+  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()