1 files changed, 44 insertions, 0 deletions
diff --git a/actionview/lib/action_view/log_subscriber.rb b/actionview/lib/action_view/log_subscriber.rb
new file mode 100644
index 0000000000..6c8d9cb5bf
--- /dev/null
+++ b/actionview/lib/action_view/log_subscriber.rb
@@ -0,0 +1,44 @@
+require 'active_support/log_subscriber'
+
+module ActionView
+  # = Action View Log Subscriber
+  #
+  # Provides functionality so that Rails can output logs from Action View.
+  class LogSubscriber < ActiveSupport::LogSubscriber
+    VIEWS_PATTERN = /^app\/views\//
+
+    def initialize
+      @root = nil
+      super
+    end
+
+    def render_template(event)
+      return unless logger.info?
+      message = "  Rendered #{from_rails_root(event.payload[:identifier])}"
+      message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
+      message << " (#{event.duration.round(1)}ms)"
+      info(message)
+    end
+    alias :render_partial :render_template
+    alias :render_collection :render_template
+
+    def logger
+      ActionView::Base.logger
+    end
+
+  protected
+
+    EMPTY = ''
+    def from_rails_root(string)
+      string = string.sub(rails_root, EMPTY)
+      string.sub!(VIEWS_PATTERN, EMPTY)
+      string
+    end
+
+    def rails_root
+      @root ||= "#{Rails.root}/"
+    end
+  end
+end
+
+ActionView::LogSubscriber.attach_to :action_view