nerding out a bit with haml

making a custom filter for LaTeX eqnarray divs

math-replay/lib/haml/filters-ext.rb

@@ -0,0 +1,22 @@
+require 'haml/filters'
+require 'haml/helpers'
+
+module Haml
+  module Filters
+    module Eqnarray
+      include Base
+
+      def render(text)
+        <<END
+<div class="eqnarray">
+    $$
+    \\begin{eqnarray}
+    #{Haml::Helpers.html_escape(text).rstrip.gsub("\n", "\n    ")}
+    \\end{eqnarray}
+    $$
+</div>
+END
+      end
+    end
+  end
+end