1 files changed, 49 insertions, 0 deletions
diff --git a/railties/lib/rails/commands/rake/rake_command.rb b/railties/lib/rails/commands/rake/rake_command.rb
new file mode 100644
index 0000000000..a4a2464445
--- /dev/null
+++ b/railties/lib/rails/commands/rake/rake_command.rb
@@ -0,0 +1,49 @@
+module Rails
+  module Command
+    class RakeCommand < Base
+      namespace "rake"
+
+      class << self
+        def printing_commands
+          formatted_rake_tasks.map(&:first)
+        end
+
+        def perform(task, *)
+          require_rake
+
+          ARGV.unshift(task) # Prepend the task, so Rake knows how to run it.
+
+          Rake.application.standard_exception_handling do
+            Rake.application.init("rails")
+            Rake.application.load_rakefile
+            Rake.application.top_level
+          end
+        end
+
+        private
+          def rake_tasks
+            require_rake
+
+            return @rake_tasks if defined?(@rake_tasks)
+
+            ActiveSupport::Deprecation.silence do
+              Rails::Command.require_application_and_environment!
+            end
+
+            Rake::TaskManager.record_task_metadata = true
+            Rake.application.instance_variable_set(:@name, "rails")
+            Rails.application.load_tasks
+            @rake_tasks = Rake.application.tasks.select(&:comment)
+          end
+
+          def formatted_rake_tasks
+            rake_tasks.map { |t| [ t.name_with_args, t.comment ] }
+          end
+
+          def require_rake
+            require "rake" # Defer booting Rake until we know it's needed.
+          end
+      end
+    end
+  end
+end