"""

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 <adam@hupp.org>

"""

from mercurial import demandimport

demandimport.ignore.extend(['pkgutil',

                            'pkg_resources',

                            '__main__',])

from mercurial import util

from mercurial.templatefilters import filters

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="#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:

        try:

            lexer = guess_lexer(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('<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

# monkeypatch in the new version