1 files changed, 63 insertions, 0 deletions
diff --git a/guides/rails_guides/textile_extensions.rb b/guides/rails_guides/textile_extensions.rb
new file mode 100644
index 0000000000..4677fae504
--- /dev/null
+++ b/guides/rails_guides/textile_extensions.rb
@@ -0,0 +1,63 @@
+require 'active_support/core_ext/object/inclusion'
+
+module RailsGuides
+  module TextileExtensions
+    def notestuff(body)
+      # The following regexp detects special labels followed by a
+      # paragraph, perhaps at the end of the document.
+      #
+      # It is important that we do not eat more than one newline
+      # because formatting may be wrong otherwise. For example,
+      # if a bulleted list follows the first item is not rendered
+      # as a list item, but as a paragraph starting with a plain
+      # asterisk.
+      body.gsub!(/^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO)[.:](.*?)(\n(?=\n)|\Z)/m) do |m|
+        css_class = case $1
+                    when 'CAUTION', 'IMPORTANT'
+                      'warning'
+                    when 'TIP'
+                      'info'
+                    else
+                      $1.downcase
+                    end
+        %Q(<div class="#{css_class}"><p>#{$2.strip}</p></div>)
+      end
+    end
+
+    def plusplus(body)
+      body.gsub!(/\+(.*?)\+/) do |m|
+        "<notextile><tt>#{$1}</tt></notextile>"
+      end
+
+      # The real plus sign
+      body.gsub!('<plus>', '+')
+    end
+
+    def brush_for(code_type)
+      case code_type
+        when 'ruby', 'sql', 'plain'
+          code_type
+        when 'erb'
+          'ruby; html-script: true'
+        when 'html'
+          'xml' # html is understood, but there are .xml rules in the CSS
+        else
+          'plain'
+      end
+    end
+
+    def code(body)
+      body.gsub!(%r{<(yaml|shell|ruby|erb|html|sql|plain)>(.*?)</\1>}m) do |m|
+        <<HTML
+<notextile>
+<div class="code_container">
+<pre class="brush: #{brush_for($1)}; gutter: false; toolbar: false">
+#{ERB::Util.h($2).strip}
+</pre>
+</div>
+</notextile>
+HTML
+      end
+    end
+  end
+end