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@@ -8,12 +8,12 @@ module Haml
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   module Helpers
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     self.extend self
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-    @@action_view = false
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+    @@action_view_defined = defined?(ActionView)
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     @@force_no_action_view = false
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     # Returns whether or not ActionView is installed on the system.
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     def self.action_view?
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-      @@action_view
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+      @@action_view_defined
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     end
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     # Isolates the whitespace-sensitive tags in the string and uses preserve
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@@ -186,11 +186,6 @@ module Haml
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     end
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     private
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-    
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-    # Sets whether or not ActionView is installed on the system.
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-    def self.action_view(value) # :nodoc:
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-      @@action_view = value
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-    end
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     # Gets a reference to the current Haml::Buffer object.
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     def buffer
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@@ -226,6 +221,7 @@ module Haml
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       end
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       result.to_s
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     end
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+    alias_method :capture_erb_with_buffer, :capture_haml_with_buffer
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     # Returns whether or not the current template is a Haml template.
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     # 
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@@ -235,8 +231,6 @@ module Haml
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     def is_haml?
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       @haml_stack ? @haml_stack.size > 0 : false
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     end
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-    
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-    include ActionViewMods if self.const_defined?  "ActionViewMods"
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   end
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 end
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@@ -9,42 +9,24 @@ rescue LoadError
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 end
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 if action_view_included
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-  class ActionView::Base
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-    alias_method :old_concat, :concat unless instance_methods.include? "old_concat"
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-    alias_method :old_form_tag, :form_tag unless instance_methods.include? "old_form_tag"
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-
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-    alias_method :old_form_for, :form_for unless instance_methods.include? "old_form_for"
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-  end
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-  
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-  module Haml
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+  module ActionView
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+    # This overrides various helpers in ActionView
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+    # to make them work more effectively with Haml.
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     module Helpers
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-      # This module overrides various helpers in ActionView
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-      # to make them work more effectively with Haml.
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-      # It also defines several helper methods,
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-      # available from a Haml template,
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-      # which are only useful within the context of ActionView.
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-      # It's not available unless ActionView is installed.
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-      #
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-      #--
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-      # Methods in this module should be nodoc'd.
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-      #++
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-      module ActionViewMods
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-        def self.included(othermod) # :nodoc:
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-          othermod.class_eval do
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-            action_view(true)
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-            alias_method :capture_erb_with_buffer, :capture_haml_with_buffer
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-          end
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-        end
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-        
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-        def concat(string, binding = nil) # :nodoc:
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+      # :stopdoc:
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+      module TextHelper
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+        def concat_with_haml(string, binding = nil)
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           if is_haml?
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             buffer.buffer.concat(string)
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           else
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-            old_concat(string, binding)
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+            concat_without_haml(string, binding)
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           end
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         end
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-        
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-        def form_tag(url_for_options = {}, options = {}, *parameters_for_url, &proc) # :nodoc:
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+        alias_method_chain :concat, :haml
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+      end
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+      
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+      module FormTagHelper
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+        def form_tag_with_haml(url_for_options = {}, options = {}, *parameters_for_url, &proc)
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           if block_given? && is_haml?
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             oldproc = proc 
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             proc = bind_proc do |*args|
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@@ -54,29 +36,33 @@ if action_view_included
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               tab_down
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             end
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           end
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-          res = old_form_tag(url_for_options, options, *parameters_for_url, &proc) + "\n"
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+          res = form_tag_without_haml(url_for_options, options, *parameters_for_url, &proc) + "\n"
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           concat "\n" if block_given? && is_haml?
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           res
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         end
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-
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-        def form_for(object_name, *args, &proc) # :nodoc:
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+        alias_method_chain :form_tag, :haml
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+      end
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+      
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+      module FormHelper
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+        def form_for_with_haml(object_name, *args, &proc)
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           if block_given? && is_haml?
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             oldproc = proc 
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             proc = bind_proc do |*args|
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               tab_up
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               oldproc.call(*args)
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               tab_down
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-            end            
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+            end
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           end
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-          old_form_for(object_name, *args, &proc)
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+          form_for_without_haml(object_name, *args, &proc)
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           concat "\n" if block_given? && is_haml?
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         end
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-
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-        def generate_content_class_names
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-          controller.controller_name + " " + controller.action_name
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-        end
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+        alias_method_chain :form_for, :haml
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+      end
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+      
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+      def generate_content_class_names
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+        controller.controller_name + " " + controller.action_name
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       end
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+      # :startdoc:
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     end
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   end
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 end
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-

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@@ -62,9 +62,9 @@ class HelperTest < Test::Unit::TestCase
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     begin
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       ActionView::Base.new.render(:inline => "<%= concat('foo') %>")
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-    rescue ArgumentError
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+    rescue ArgumentError, NameError
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       proper_behavior = true
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-    end    
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+    end
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     assert(proper_behavior)
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   end
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