Enforce space only indendation in CMake files

.gitlab-ci.yml

@@ -132,6 +132,7 @@ Clang_Format:
   before_script:
     - CI/install_debian_deps.sh openmw-clang-format
   script:
+    - CI/check_cmake_format.sh
     - CI/check_file_names.sh
     - CI/check_clang_format.sh
 

CI/check_cmake_format.sh

@@ -0,0 +1,6 @@
+#!/bin/bash -ex
+
+git ls-files -- ':(exclude)extern/' 'CMakeLists.txt' '*.cmake' |
+    xargs grep -P '^\s*\t' &&
+    ( echo 'CMake files contain leading tab character. Use only spaces for indentation'; exit -1 )
+exit 0