Delegates `layout_*' messages as Layout#handle_*

features/actions/layout_delegation.feature

@@ -0,0 +1,31 @@
+Feature: `layout_*' action keywords
+
+  Background:
+    Given a file named layout.rb with:
+      """
+      class Layout
+        def register _; end
+
+        def handle_some_action arg
+          puts arg
+        end
+      end
+      """
+
+  Scenario: delegates messages matching `layout_*' to `layout_handle_*'
+    Given a run control file with:
+      """
+      key(:f) { layout_some_action :testing_some_action }
+      """
+    And uhwm is running
+    When I press the alt+f keys
+    Then the output must contain ":testing_some_action"
+
+  Scenario: logs an error about unimplemented messages
+    Given a run control file with:
+      """
+      key(:f) { layout_unknown_action }
+      """
+    And uhwm is running
+    When I press the alt+f keys
+    Then the output must match /layout.+no.+implem.+handle_unknown_action/i

lib/uh/wm/actions_handler.rb

@@ -3,6 +3,9 @@ module Uh
     class ActionsHandler
       include EnvLogging
 
+      extend Forwardable
+      def_delegator :@env, :layout
+
       def initialize env, events
         @env, @events = env, events
       end
@@ -30,6 +33,31 @@ module Uh
         end
         Process.waitpid pid
       end
+
+      def method_missing(m, *args, &block)
+        if respond_to? m
+          meth = layout_method m
+          log "#{layout.class.name}##{meth} #{args.inspect}"
+          begin
+            layout.send(meth, *args)
+          rescue NoMethodError
+            log_error "Layout does not implement `#{meth}'"
+          end
+        else
+          super
+        end
+      end
+
+      def respond_to_missing?(m, *)
+        m.to_s =~ /\Alayout_/ || super
+      end
+
+
+      private
+
+      def layout_method(m)
+        m.to_s.gsub(/\Alayout_/, 'handle_').to_sym
+      end
     end
   end
 end

spec/uh/wm/actions_handler_spec.rb

@@ -18,6 +18,13 @@ module Uh
           actions.quit
         end
       end
+
+      describe '#layout_*' do
+        it 'delegates messages to the layout with handle_ prefix' do
+          expect(env.layout).to receive :handle_screen_sel
+          actions.layout_screen_sel :succ
+        end
+      end
     end
   end
 end