Fall back to guess the lexer by content

If we can't guess the lexer by the file name, try to guess based on the
content.

This allows pygments to colorize extension-less files, usually scripts.

Signed-off-by: Alberto Bertogli <[email protected]>

Author: albertito

utils.py

@@ -50,9 +50,13 @@ def colorize_diff(s):
 
 def colorize_blob(fname, s):
     try:
-        lexer = lexers.guess_lexer_for_filename(fname, s)
+        lexer = lexers.guess_lexer_for_filename(fname, s, encoding = 'utf-8')
     except lexers.ClassNotFound:
-        lexer = lexers.TextLexer(encoding = 'utf-8')
+        try:
+            lexer = lexers.guess_lexer(s[:200], encoding = 'utf-8')
+        except lexers.ClassNotFound:
+            lexer = lexers.TextLexer(encoding = 'utf-8')
+
     formatter = HtmlFormatter(encoding = 'utf-8',
                     cssclass = 'source_code',
                     linenos = 'table')