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-rw-r--r--danger/only_documentation/Dangerfile24
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diff --git a/danger/only_documentation/Dangerfile b/danger/only_documentation/Dangerfile
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+++ b/danger/only_documentation/Dangerfile
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+# rubocop:disable Style/SignalException
+# frozen_string_literal: true
+
+has_only_docs_changes = helper.all_changed_files.all? { |file| file.start_with?('doc/') }
+is_docs_only_branch = gitlab.branch_for_head =~ /(^docs[\/-].*|.*-docs$)/
+
+if is_docs_only_branch && !has_only_docs_changes
+ fail "It seems like your branch name has a `docs` prefix or suffix. "\
+ "The CI won't run the full pipeline, but you also have changed non-docs files. "\
+ "Please recreate this MR with a new branch name."
+end
+
+if has_only_docs_changes && !is_docs_only_branch
+ markdown(<<~MARKDOWN)
+
+ ## Documentation only changes
+
+ Hey! Seems your merge request contains only docs changes.
+ Tired of waiting 2 hours for the pipeline to finish?
+ Next time, prepend `docs-` to [your branch name](https://docs.gitlab.com/ee/development/documentation/#branch-naming)
+ and the pipeline will finish before you say GitLab (x300)!
+
+ MARKDOWN
+end