add output of escaped erb <%== into haml's !=

issue #44

lib/html2haml/html.rb

@@ -286,7 +286,12 @@ def to_haml(tabs, options)
           when "haml_loud"
             lines = CGI.unescapeHTML(inner_text).split("\n").
               map {|s| s.rstrip}.reject {|s| s.strip.empty?}
-            lines.first.gsub!(/^[ \t]*/, "= ")
+
+            if attribute("raw")
+              lines.first.gsub!(/^[ \t]*/, "!= ")
+            else
+              lines.first.gsub!(/^[ \t]*/, "= ")
+            end
 
             if lines.size > 1 # Multiline script block
               # Normalize the indentation so that the last line is the base

lib/html2haml/html/erb.rb

@@ -15,6 +15,7 @@ class HTML
     # The ERB tags are converted to HTML tags in the following way.
     # `<% ... %>` is converted into `<haml_silent> ... </haml_silent>`.
     # `<%= ... %>` is converted into `<haml_loud> ... </haml_loud>`.
+    # `<%== ... %>` is converted into `<haml_loud raw=raw> ... </haml_loud>`.
     # Finally, if either of these opens a Ruby block,
     # `<haml_block> ... </haml_block>` will wrap the entire contents of the block -
     # that is, everything that should be indented beneath the previous silent or loud tag.
@@ -28,11 +29,6 @@ def self.compile(template)
         new(template).src
       end
 
-      # `html2haml` doesn't support HTML-escaped expressions.
-      def escaped_expr(code)
-        raise Haml::Error.new("html2haml doesn't support escaped expressions.")
-      end
-
       # The ERB-to-Hamlized-HTML conversion has no preamble.
       def add_preamble(src); end
 
@@ -77,6 +73,10 @@ def add_expr_literal(src, code)
         src << '<haml_block>' if block_opener?(code)
       end
 
+      def add_expr_escaped(src, code)
+        src << "<haml_loud raw=raw>" << h(code) << "</haml_loud>"
+      end
+
       # `html2haml` doesn't support debugging expressions.
       def add_expr_debug(src, code)
         raise Haml::Error.new("html2haml doesn't support debugging expressions.")