1 files changed, 23 insertions, 0 deletions
diff --git a/actionview/lib/action_view/tasks/cache_digests.rake b/actionview/lib/action_view/tasks/cache_digests.rake
new file mode 100644
index 0000000000..045bdf5691
--- /dev/null
+++ b/actionview/lib/action_view/tasks/cache_digests.rake
@@ -0,0 +1,23 @@
+namespace :cache_digests do
+  desc 'Lookup nested dependencies for TEMPLATE (like messages/show or comments/_comment.html)'
+  task :nested_dependencies => :environment do
+    abort 'You must provide TEMPLATE for the task to run' unless ENV['TEMPLATE'].present?
+    puts JSON.pretty_generate ActionView::Digestor.tree(CacheDigests.template_name, CacheDigests.finder).children.map(&:to_dep_map)
+  end
+
+  desc 'Lookup first-level dependencies for TEMPLATE (like messages/show or comments/_comment.html)'
+  task :dependencies => :environment do
+    abort 'You must provide TEMPLATE for the task to run' unless ENV['TEMPLATE'].present?
+    puts JSON.pretty_generate ActionView::Digestor.tree(CacheDigests.template_name, CacheDigests.finder).children.map(&:name)
+  end
+
+  class CacheDigests
+    def self.template_name
+      ENV['TEMPLATE'].split('.', 2).first
+    end
+
+    def self.finder
+      ApplicationController.new.lookup_context
+    end
+  end
+end