1 # highlight extension implementation file

     2 #

     3 # The original module was split in an interface and an implementation

     4 # file to defer pygments loading and speedup extension setup.

     5 

     6 from mercurial import demandimport

     7 demandimport.ignore.extend(['pkgutil', 'pkg_resources', '__main__',])

     8 

     9 from mercurial import util

    10 from mercurial.templatefilters import filters

    11 

    12 from pygments import highlight

    13 from pygments.util import ClassNotFound

    14 from pygments.lexers import guess_lexer, guess_lexer_for_filename, TextLexer

    15 from pygments.formatters import HtmlFormatter

    16 

    17 SYNTAX_CSS = ('\n<link rel="stylesheet" href="{url}highlightcss" '

    18               'type="text/css" />')

    19 

    20 def pygmentize(field, fctx, style, tmpl):

    21 

    22     # append a <link ...> to the syntax highlighting css

    23     old_header = ''.join(tmpl('header'))

    24     if SYNTAX_CSS not in old_header:

    25         new_header =  old_header + SYNTAX_CSS

    26         tmpl.cache['header'] = new_header

    27 

    28     text = fctx.data()

    29     if util.binary(text):

    30         return

    31 

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

    33     try:

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

    35                                          encoding=util._encoding)

    36     except (ClassNotFound, ValueError):

    37         try:

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

    39         except (ClassNotFound, ValueError):

    40             lexer = TextLexer(encoding=util._encoding)

    41 

    42     formatter = HtmlFormatter(style=style, encoding=util._encoding)

    43 

    44     colorized = highlight(text, lexer, formatter)

    45     # strip wrapping div

    46     colorized = colorized[:colorized.find('\n</pre>')]

    47     colorized = colorized[colorized.find('<pre>')+5:]

    48     coloriter = iter(colorized.splitlines())

    49 

    50     filters['colorize'] = lambda x: coloriter.next()

    51 

    52     oldl = tmpl.cache[field]

    53     newl = oldl.replace('line|escape', 'line|colorize')

    54     tmpl.cache[field] = newl