1.6.1dev: prevent uses of unnecessary lineno styles from Pygments 2.7…

….0+ (closes #13866)

git-svn-id: http://trac.edgewall.org/intertrac/log:/branches/1.6-stable@17877 af82e41b-90c4-0310-8c96-b1721e28e2e2

trac/mimeview/pygments.py

@@ -37,6 +37,20 @@
 __all__ = ['PygmentsRenderer']
 
 
+if hasattr(HtmlFormatter, 'get_background_style_defs') and \
+        hasattr(HtmlFormatter, 'get_token_style_defs'):
+    def _get_style_defs(style, arg):
+        lines = []
+        formatter = HtmlFormatter(style=style)
+        lines.extend(formatter.get_background_style_defs(arg))
+        lines.extend(formatter.get_token_style_defs(arg))
+        return '\n'.join(lines)
+else:
+    def _get_style_defs(style, arg):
+        formatter = HtmlFormatter(style=style)
+        return formatter.get_style_defs(arg)
+
+
 class PygmentsRenderer(Component):
     """HTML renderer for syntax highlighting based on Pygments."""
 
@@ -186,8 +200,7 @@ def process_request(self, req):
             req.end_headers()
             return
 
-        formatter = HtmlFormatter(style=style_cls)
-        content = formatter.get_style_defs(['div.code pre', 'table.code td'])
+        content = _get_style_defs(style_cls, ['div.code pre', 'table.code td'])
         content = content.encode('utf-8')
 
         req.send_response(200)