Move the t alias to its own extension file

README.rdoc

@@ -12,9 +12,19 @@ License::   MIT
 
 RedCloth is a Ruby library for converting Textile into HTML.
 
-== Attention - Deprecating JRuby and Windows support in version 4.3
+== Attention: **BREAKING CHANGE** RedCloth 5.x series
 
-In order to prioritize merging a fix for the long standing vulnerability *CVE-2012-6684*, our {new maintainer}[https://github.com/joshuasiler] has elected to stop maintaining the precompiled versions for Windows and JRuby. 
+RedCloth 5.x series will not create the the <tt>t</tt> alias by default, but will provide an extension file if you wish to continue that behavior.
+
+Keep in mind the long term plan is to drop this all together.
+
+== JRuby and Windows support in version 4.3
+
+A while ago, around the time *CVE-2012-6684* was open, the {maintainer at that time}[https://github.com/joshuasiler], has elected to stop maintaining the precompiled versions for Windows and JRuby.
+
+But there is an ongoing effort to restore JRuby support.
+
+If this interests you, please :+1: {Issue #44}[https://github.com/jgarber/redcloth/issues/44].
 
 == Installing
 

lib/redcloth.rb

@@ -28,23 +28,16 @@
 require 'redcloth/formatters/latex'
 
 module RedCloth
-  
+
   # A convenience method for creating a new TextileDoc. See
   # RedCloth::TextileDoc.
   def self.new( *args, &block )
     RedCloth::TextileDoc.new( *args, &block )
   end
-  
+
   # Include extension modules (if any) in TextileDoc.
   def self.include(*args)
     RedCloth::TextileDoc.send(:include, *args)
   end
-
-end
 
-begin
-  require 'erb'
-  require 'redcloth/erb_extension'
-  include ERB::Util
-rescue LoadError
 end

lib/redcloth/erb_alias_extension.rb

@@ -0,0 +1,15 @@
+
+require 'erb'
+require 'redcloth/erb_extension'
+
+class ERB
+  module Util
+    alias t textilize
+    module_function :t
+  end
+end
+
+begin
+  include ERB::Util
+rescue LoadError
+end

lib/redcloth/erb_extension.rb

@@ -19,8 +19,6 @@ def textilize( s )
       end
     end
 
-    alias t textilize
-    module_function :t
     module_function :textilize
 
   end

redcloth.gemspec

@@ -43,4 +43,10 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rspec', '~> 3.12')
   s.add_development_dependency('diff-lcs', '~> 1.5')
 
+  s.post_install_message = %q{
+    **BREAKING CHANGE**: RedCloth 5.x series
+    RedCloth 5.x series has one breaking change related to alias `t`
+    Please see https://github.com/jgarber/redcloth#attention-breaking-change-redcloth-5x-series-
+  }
+
 end

spec/erb_spec.rb

@@ -1,4 +1,5 @@
 require File.dirname(__FILE__) + '/spec_helper'
+require 'redcloth/erb_alias_extension'
 
 describe "ERB helper" do
   it "should add a textile tag to ERB" do