Add documentation metadata check to lefthook

doc/development/contributing/style_guides.md

@@ -62,6 +62,7 @@ Before you push your changes, Lefthook automatically runs the following checks:
 - SCSS lint: Run `yarn lint:stylelint` checks (with the [`.stylelintrc`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.stylelintrc) configuration) on the modified `*.scss{,.css}` files. Tags: `stylesheet`, `css`, `style`.
 - RuboCop: Run `bundle exec rubocop` checks (with the [`.rubocop.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.rubocop.yml) configuration) on the modified `*.rb` files. Tags: `backend`, `style`.
 - Vale: Run `vale` checks (with the [`.vale.ini`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.vale.ini) configuration) on the modified `*.md` files. Tags: `documentation`, `style`.
+- Documentation metadata: Run checks for the absence of [documentation metadata](../documentation/index.md#metadata).
 
 In addition to the default configuration, you can define a [local configuration](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#local-config).
 

lefthook.yml

@@ -38,3 +38,7 @@ pre-push:
       files: git diff --name-only --diff-filter=d $(git merge-base origin/master HEAD)..HEAD
       glob: 'doc/*.md'
       run: if command -v vale 2> /dev/null; then vale --config .vale.ini --minAlertLevel error {files}; else echo "Vale not found. Install Vale"; fi
+    docs-metadata:  # https://docs.gitlab.com/ee/development/documentation/#metadata
+      tags: documentation style
+      files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD | grep '.md'
+      run: if [[ $(head -n1 {files} | grep -v --count -- '---') -ge 1 ]]; then echo "$(tput setaf 1)Documentation metadata missing in changed Markdown files.$(tput sgr0) For more information, see https://docs.gitlab.com/ee/development/documentation/#metadata."; false; else echo "$(tput sgr0)Metadata found in {files}."; fi;