highlight: guess by text when path name is ambiguous

highlight: guess by text when path name is ambiguous
Although the docs claim that guess_lexer_for_filename will fall back
to using file data, my ubuntu 7.10 pygments library seems to ignore
the text argument. So call guess_lexer explicitly on failure.

--- a/hgext/highlight.py	Fri Feb 29 14:21:15 2008 -0800
+++ b/hgext/highlight.py	Fri Feb 29 14:47:07 2008 -0800
@@ -65,7 +65,10 @@
         lexer = guess_lexer_for_filename(fctx.path(), text,
                                          encoding=util._encoding)
     except ClassNotFound:
-        lexer = TextLexer(encoding=util._encoding)
+        try:
+            lexer = guess_lexer(text, encoding=util._encoding)
+        except ClassNotFound:
+            lexer = TextLexer(encoding=util._encoding)
 
     formatter = HtmlFormatter(style=style, encoding=util._encoding)