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# 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 or any later version.
#
# The original module was split in an interface and an implementation
# file to defer pygments loading and speedup extension setup.
from mercurial import demandimport
demandimport.ignore.extend(['pkgutil', 'pkg_resources', '__main__'])
from mercurial import util, encoding
from pygments import highlight
from pygments.util import ClassNotFound
from pygments.lexers import guess_lexer, guess_lexer_for_filename, TextLexer
from 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 = tmpl.load('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
# Pygments is best used with Unicode strings:
# <http://pygments.org/docs/unicode/>
text = text.decode(encoding.encoding, 'replace')
# To get multi-line strings right, we can't format line-by-line
try:
lexer = guess_lexer_for_filename(fctx.path(), text[:1024])
except (ClassNotFound, ValueError):
try:
lexer = guess_lexer(text[:1024])
except (ClassNotFound, ValueError):
lexer = TextLexer()
formatter = HtmlFormatter(style=style)
colorized = highlight(text, lexer, formatter)
# strip wrapping div
colorized = colorized[:colorized.find('\n</pre>')]
colorized = colorized[colorized.find('<pre>')+5:]
coloriter = (s.encode(encoding.encoding, 'replace')
for s in colorized.splitlines())
tmpl.filters['colorize'] = lambda x: coloriter.next()
oldl = tmpl.cache[field]
newl = oldl.replace('line|escape', 'line|colorize')
tmpl.cache[field] = newl
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