danger: Move rules into subdirectory

It's best practice for Danger rules to live in a separate "rules/"
directory. Let's move them there, which also allows us to use globs to
import all rules.

1 files changed, 48 insertions, 0 deletions

diff --git a/danger/rules/labels/Dangerfile b/danger/rules/labels/Dangerfile
new file mode 100644
index 000000000..6bfee7178
--- /dev/null
+++ b/danger/rules/labels/Dangerfile
@@ -0,0 +1,48 @@
+def changelog_entry
+  @changelog_entry ||=
+    begin
+      file = git.added_files.find { |path| path =~ %r{\Achangelogs/unreleased/} }
+
+      YAML.safe_load(File.read(file))
+    rescue
+      # The change log danger file will handle this
+      {}
+    end
+end
+
+required_labels = %w[devops::create]
+required_labels << "group::gitaly" if GITALY_TEAM.include?(gitlab.mr_author)
+
+TYPE_TO_LABEL = {
+  'added' => %w[type::feature feature::addition],
+  'fixed' => ['type::bug'],
+  'changed' => ['type::maintenance'],
+  'deprecated' => ['type::maintenance'],
+  'security' => ['security'],
+  'removed' => ['type::maintenance'],
+  'performance' => %w[type::maintenance performance],
+  'other' => ['type::tooling'],
+  nil => []
+}
+
+INHERITABLE_LABELS = TYPE_TO_LABEL.values.flatten + %w[Deliverable]
+
+def inherited_labels
+  gitlab.api
+    .merge_request_closes_issues( gitlab.mr_json['project_id'], gitlab.mr_json['iid'])
+    .flat_map { |i| i.labels }
+    .compact
+    .uniq
+    .select { |label| INHERITABLE_LABELS.include?(label) }
+end
+
+required_labels.concat(TYPE_TO_LABEL[changelog_entry["type"]])
+
+mr_labels = gitlab.mr_labels | required_labels | inherited_labels
+gitlab.api.update_merge_request(
+  gitlab.mr_json['project_id'],
+  gitlab.mr_json['iid'],
+  labels: mr_labels.join(",")
+)
+
+# vim: ft=ruby