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="{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

    # To get multi-line strings right, we can't format line-by-line

    try:

        lexer = guess_lexer_for_filename(fctx.path(), text[:1024],

                                         encoding=util._encoding)

    except (ClassNotFound, ValueError):

        try:

            lexer = guess_lexer(text[:1024], encoding=util._encoding)

        except (ClassNotFound, ValueError):

            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