# highlight.py - highlight extension implementation file##  Copyright 2007-2009 Adam Hupp <adam@hupp.org> and others## This software may be used and distributed according to the terms of the# GNU General Public License version 2, incorporated herein by reference.## The original module was split in an interface and an implementation# file to defer pygments loading and speedup extension setup. from mercurial import demandimportdemandimport.ignore.extend(['pkgutil', 'pkg_resources', '__main__',])from mercurial import util, encoding from pygments import highlightfrom pygments.util import ClassNotFoundfrom pygments.lexers import guess_lexer, guess_lexer_for_filename, TextLexerfrom pygments.formatters import HtmlFormatter SYNTAX_CSS = ('\n<link rel="stylesheet" href="{url}highlightcss" '              'type="text/css" />') def pygmentize(field, fctx, style, tmpl):     # 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     # avoid UnicodeDecodeError in pygments    text = encoding.tolocal(text)     # To get multi-line strings right, we can't format line-by-line    try:        lexer = guess_lexer_for_filename(fctx.path(), text[:1024],                                         encoding=encoding.encoding)    except (ClassNotFound, ValueError):        try:            lexer = guess_lexer(text[:1024], encoding=encoding.encoding)        except (ClassNotFound, ValueError):            lexer = TextLexer(encoding=encoding.encoding)     formatter = HtmlFormatter(style=style, encoding=encoding.encoding)     colorized = highlight(text, lexer, formatter)    # strip wrapping div    colorized = colorized[:colorized.find('\n</pre>')]    colorized = colorized[colorized.find('<pre>')+5:]    coloriter = iter(colorized.splitlines())     tmpl.filters['colorize'] = lambda x: coloriter.next()     oldl = tmpl.cache[field]    newl = oldl.replace('line|escape', 'line|colorize')    tmpl.cache[field] = newl