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# highlight.py - highlight extension implementation file
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#
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# Copyright 2007-2009 Adam Hupp <adam@hupp.org> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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#
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# The original module was split in an interface and an implementation
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# file to defer pygments loading and speedup extension setup.
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from __future__ import absolute_import
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import pygments
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import pygments.formatters
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import pygments.lexers
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import pygments.util
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from mercurial import demandimport
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demandimport.ignore.extend(['pkgutil', 'pkg_resources', '__main__'])
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from mercurial import (
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encoding,
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util,
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)
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highlight = pygments.highlight
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ClassNotFound = pygments.util.ClassNotFound
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guess_lexer = pygments.lexers.guess_lexer
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guess_lexer_for_filename = pygments.lexers.guess_lexer_for_filename
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TextLexer = pygments.lexers.TextLexer
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HtmlFormatter = pygments.formatters.HtmlFormatter
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SYNTAX_CSS = ('\n<link rel="stylesheet" href="{url}highlightcss" '
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'type="text/css" />')
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def pygmentize(field, fctx, style, tmpl, guessfilenameonly=False):
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# append a <link ...> to the syntax highlighting css
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old_header = tmpl.load('header')
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if SYNTAX_CSS not in old_header:
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new_header = old_header + SYNTAX_CSS
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tmpl.cache['header'] = new_header
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text = fctx.data()
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if util.binary(text):
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return
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# str.splitlines() != unicode.splitlines() because "reasons"
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for c in "\x0c\x1c\x1d\x1e":
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if c in text:
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text = text.replace(c, '')
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# Pygments is best used with Unicode strings:
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# <http://pygments.org/docs/unicode/>
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text = text.decode(encoding.encoding, 'replace')
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# To get multi-line strings right, we can't format line-by-line
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try:
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lexer = guess_lexer_for_filename(fctx.path(), text[:1024],
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stripnl=False)
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except (ClassNotFound, ValueError):
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# guess_lexer will return a lexer if *any* lexer matches. There is
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# no way to specify a minimum match score. This can give a high rate of
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# false positives on files with an unknown filename pattern.
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if guessfilenameonly:
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return
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try:
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lexer = guess_lexer(text[:1024], stripnl=False)
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except (ClassNotFound, ValueError):
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# Don't highlight unknown files
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return
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# Don't highlight text files
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if isinstance(lexer, TextLexer):
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return
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formatter = HtmlFormatter(nowrap=True, style=style)
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colorized = highlight(text, lexer, formatter)
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coloriter = (s.encode(encoding.encoding, 'replace')
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for s in colorized.splitlines())
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tmpl.filters['colorize'] = lambda x: next(coloriter)
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oldl = tmpl.cache[field]
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newl = oldl.replace('line|escape', 'line|colorize')
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tmpl.cache[field] = newl
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