fix coderay -HTML option

Author: korny

Changes.textile

@@ -33,6 +33,7 @@ h2. Changes in 1.1
 * The @Debug@ scanner maps unknown token kinds to @:unknown@ (to avoid creating Symbols based on possibly unsafe input)
 * The @Raydebug@ scanner highlights unknown token kinds as @:plain@
 * @Plugin@ does not warn about fallback when default is defined
+* Fixed @HTML@ encoder when output is a StringIO (eg. when using @-HTML@)
 * @HTML@ encoder will not warn about unclosed token groups at the end of the stream
 * @Debug@ encoder refactored; use @DebugLint@ if you want strict checking now
 * @Debug@ encoder will not warn about errors in the token stream

lib/coderay/encoders/html.rb

@@ -197,13 +197,15 @@ def finish options
         @last_opened = nil
       end
 
-      @out.extend Output
-      @out.css = @css
-      if options[:line_numbers]
-        Numbering.number! @out, options[:line_numbers], options
+      if @out.respond_to? :to_str
+        @out.extend Output
+        @out.css = @css
+        if options[:line_numbers]
+          Numbering.number! @out, options[:line_numbers], options
+        end
+        @out.wrap! options[:wrap]
+        @out.apply_title! options[:title]
       end
-      @out.wrap! options[:wrap]
-      @out.apply_title! options[:title]
 
       if defined?(@real_out) && @real_out
         @real_out << @out