highlight: make div trimmer work when lexer fails to identify text.

In this case, there is no initial <span> tag.

hgext/highlight.py

@@ -1,100 +1,100 b''
 """
 This is Mercurial extension for syntax highlighting in the file
 revision view of hgweb.
 
 It depends on the pygments syntax highlighting library:
 http://pygments.org/
 
 To enable the extension add this to hgrc:
 
 [extensions]
 hgext.highlight =
 
 There is a single configuration option:
 
 [web]
 pygments_style = <style>
 
 The default is 'colorful'.  If this is changed the corresponding CSS
 file should be re-generated by running
 
 # pygmentize -f html -S <newstyle>
 
 
 -- Adam Hupp <[e-mail]>
 
 
 """
 
 from mercurial import demandimport
 demandimport.ignore.extend(['pkgutil',
                             'pkg_resources',
                             '__main__',])
 
 import mimetypes
 
 from mercurial.hgweb import hgweb_mod
 from mercurial.hgweb.hgweb_mod import hgweb
 from mercurial import util
 from mercurial.hgweb.common import paritygen
 from mercurial.node import hex
 from mercurial.templatefilters import filters
 
 from pygments import highlight
 from pygments.util import ClassNotFound
 from pygments.lexers import guess_lexer_for_filename, TextLexer
 from pygments.formatters import HtmlFormatter
 
 SYNTAX_CSS = ('\n<link rel="stylesheet" href="#staticurl#highlight.css" '
               'type="text/css" />')
 
 def pygmentize(self, tmpl, fctx, field):
     # append a <link ...> to the syntax highlighting css
     old_header = ''.join(tmpl('header'))
     if SYNTAX_CSS not in old_header:
         new_header =  old_header + SYNTAX_CSS
         tmpl.cache['header'] = new_header
 
     text = fctx.data()
     if util.binary(text):
         return
 
     style = self.config("web", "pygments_style", "colorful")
     # To get multi-line strings right, we can't format line-by-line
     try:
         lexer = guess_lexer_for_filename(fctx.path(), text,
                                          encoding=util._encoding)
     except ClassNotFound:
         lexer = TextLexer(encoding=util._encoding)
 
     formatter = HtmlFormatter(style=style, encoding=util._encoding)
 
     colorized = highlight(text, lexer, formatter)
     # strip wrapping div
     colorized = colorized[:colorized.find('\n</pre>')]
-    colorized = colorized[colorized.find('<span'):]
+    colorized = colorized[colorized.find('<pre>')+5:]
     coloriter = iter(colorized.splitlines())
 
     filters['colorize'] = lambda x: coloriter.next()
 
     oldl = tmpl.cache[field]
     newl = oldl.replace('line|escape', 'line|colorize')
     tmpl.cache[field] = newl
 
 def filerevision_highlight(self, tmpl, fctx):
     pygmentize(self, tmpl, fctx, 'fileline')
 
     return realrevision(self, tmpl, fctx)
 
 def fileannotate_highlight(self, tmpl, fctx):
     pygmentize(self, tmpl, fctx, 'annotateline')
 
     return realannotate(self, tmpl, fctx)
 
 # monkeypatch in the new version
 # should be safer than overriding the method in a derived class
 # and then patching the class
 realrevision = hgweb.filerevision
 hgweb.filerevision = filerevision_highlight
 realannotate = hgweb.fileannotate
 hgweb.fileannotate = fileannotate_highlight