Remove last vestiges of Sass and simplifiy loading

init.rb

@@ -1,18 +1 @@
-begin
+require "haml"
-  require File.join(File.dirname(__FILE__), 'lib', 'haml') # From here
-rescue LoadError
-  begin
-    require 'haml' # From gem
-  rescue LoadError => e
-    # gems:install may be run to install Haml with the skeleton plugin
-    # but not the gem itself installed.
-    # Don't die if this is the case.
-    raise e unless defined?(Rake) &&
-      (Rake.application.top_level_tasks.include?('gems') ||
-        Rake.application.top_level_tasks.include?('gems:install'))
-  end
-end
-
-# Load Haml.
-# Haml may be undefined if we're running gems:install.
-Haml.init_rails(binding) if defined?(Haml)

lib/haml.rb

@@ -1,6 +1,3 @@
-dir = File.dirname(__FILE__)
-$LOAD_PATH.unshift dir unless $LOAD_PATH.include?(dir)
-
 require 'haml/version'
 
 # The module that contains everything Haml-related:
@@ -13,35 +10,8 @@ require 'haml/version'
 #
 # Also see the {file:REFERENCE.md full Haml reference}.
 module Haml
-  # Initializes Haml for Rails.
-  #
-  # This method is called by `init.rb`,
-  # which is run by Rails on startup.
-  # We use it rather than putting stuff straight into `init.rb`
-  # so we can change the initialization behavior
-  # without modifying the file itself.
-  #
-  # @param binding [Binding] The context of the `init.rb` file.
-  #   This isn't actually used;
-  #   it's just passed in in case it needs to be used in the future
-  def self.init_rails(binding)
-    # 2.2 <= Rails < 3
-    if defined?(Rails) && Rails.respond_to?(:configuration) &&
-        Rails.configuration.respond_to?(:after_initialize) &&
-        !Haml::Util.ap_geq_3?
-      Rails.configuration.after_initialize do
-        next if defined?(Sass)
-        autoload(:Sass, 'sass/rails2_shim')
-        # resolve autoload if it looks like they're using Sass without options
-        Sass if File.exist?(File.join(RAILS_ROOT, 'public/stylesheets/sass'))
-      end
-    end
-
-    # No &method here for Rails 2.1 compatibility
-    %w[haml/template].each {|f| require f}
-  end
 end
 
 require 'haml/util'
 require 'haml/engine'
-require 'haml/railtie'
+require 'haml/railtie' if defined?(Rails)

lib/haml/filters.rb

@@ -16,7 +16,7 @@ module Haml
     # Loads an external template engine from
     # [Tilt](https://github.com/rtomayko/tilt) as a filter.
     def register_tilt_filter(name, options = {})
-      if const_defined?(name.to_s, false)
+      if const_defined?(name.to_s)
         raise "#{name} filter already defined"
       end
 

lib/haml/railtie.rb

@@ -1,16 +1,8 @@
-if Haml::Util.ap_geq_3? && !Haml::Util.ap_geq?("3.0.0.beta4")
-  raise <<ERROR
-Haml no longer supports Rails 3 versions before beta 4.
-  Please upgrade to Rails 3.0.0.beta4 or later.
-ERROR
-end
-
-# Rails 3.0.0.beta.2+
 if defined?(ActiveSupport) && Haml::Util.has?(:public_method, ActiveSupport, :on_load)
   require 'haml/template/options'
   ActiveSupport.on_load(:before_initialize) do
     ActiveSupport.on_load(:action_view) do
-      Haml.init_rails(binding)
+      require "haml/template"
     end
   end
 end