]> git.lizzy.rs Git - plan9front.git/blob - sys/lib/python/hgext/highlight/highlight.py
added factotum support for python and hg
[plan9front.git] / sys / lib / python / hgext / highlight / highlight.py
1 # highlight.py - highlight extension implementation file
2 #
3 #  Copyright 2007-2009 Adam Hupp <adam@hupp.org> and others
4 #
5 # This software may be used and distributed according to the terms of the
6 # GNU General Public License version 2, incorporated herein by reference.
7 #
8 # The original module was split in an interface and an implementation
9 # file to defer pygments loading and speedup extension setup.
10
11 from mercurial import demandimport
12 demandimport.ignore.extend(['pkgutil', 'pkg_resources', '__main__',])
13 from mercurial import util, encoding
14
15 from pygments import highlight
16 from pygments.util import ClassNotFound
17 from pygments.lexers import guess_lexer, guess_lexer_for_filename, TextLexer
18 from pygments.formatters import HtmlFormatter
19
20 SYNTAX_CSS = ('\n<link rel="stylesheet" href="{url}highlightcss" '
21               'type="text/css" />')
22
23 def pygmentize(field, fctx, style, tmpl):
24
25     # append a <link ...> to the syntax highlighting css
26     old_header = ''.join(tmpl('header'))
27     if SYNTAX_CSS not in old_header:
28         new_header =  old_header + SYNTAX_CSS
29         tmpl.cache['header'] = new_header
30
31     text = fctx.data()
32     if util.binary(text):
33         return
34
35     # avoid UnicodeDecodeError in pygments
36     text = encoding.tolocal(text)
37
38     # To get multi-line strings right, we can't format line-by-line
39     try:
40         lexer = guess_lexer_for_filename(fctx.path(), text[:1024],
41                                          encoding=encoding.encoding)
42     except (ClassNotFound, ValueError):
43         try:
44             lexer = guess_lexer(text[:1024], encoding=encoding.encoding)
45         except (ClassNotFound, ValueError):
46             lexer = TextLexer(encoding=encoding.encoding)
47
48     formatter = HtmlFormatter(style=style, encoding=encoding.encoding)
49
50     colorized = highlight(text, lexer, formatter)
51     # strip wrapping div
52     colorized = colorized[:colorized.find('\n</pre>')]
53     colorized = colorized[colorized.find('<pre>')+5:]
54     coloriter = iter(colorized.splitlines())
55
56     tmpl.filters['colorize'] = lambda x: coloriter.next()
57
58     oldl = tmpl.cache[field]
59     newl = oldl.replace('line|escape', 'line|colorize')
60     tmpl.cache[field] = newl