highlight: fix encoding issues to enable Py3 compatibility

This commit fixes various encoding issues with the `highlight` extension
to enable compatibility with Python 3. Python `.encode()` and `.decode()`
requires the target encoding to be passed as a `str`, so the value of
`mercurial.encoding.encoding` must be converted before passing to the
function. Pygments also assumes the `str` type for values it works with,
so we must perform conversions before and after receiving values from its
APIs.

After applying this patch, `test-highlight.t` passes under Python 3. We
add it to `python3-whitelist` as well.

Tested with Pygments 2.4.2.

Differential Revision: https://phab.mercurial-scm.org/D6832

contrib/python3-whitelist

@@ -1,788 +1,789
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 test-win32text.t
 test-wireproto-caching.t
 test-wireproto-clientreactor.py
 test-wireproto-command-branchmap.t
 test-wireproto-command-capabilities.t
 test-wireproto-command-changesetdata.t
 test-wireproto-command-filedata.t
 test-wireproto-command-filesdata.t
 test-wireproto-command-heads.t
 test-wireproto-command-known.t
 test-wireproto-command-listkeys.t
 test-wireproto-command-lookup.t
 test-wireproto-command-manifestdata.t
 test-wireproto-command-pushkey.t
 test-wireproto-command-rawstorefiledata.t
 test-wireproto-content-redirects.t
 test-wireproto-exchangev2.t
 test-wireproto-framing.py
 test-wireproto-serverreactor.py
 test-wireproto.py
 test-wireproto.t
 test-worker.t
 test-wsgirequest.py
 test-xdg.t

hgext/highlight/__init__.py

@@ -1,96 +1,98
 # highlight - syntax highlighting in hgweb, based on Pygments
 #
 #  Copyright 2008, 2009 Patrick Mezard <[e-mail]> 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.
 
 """syntax highlighting for hgweb (requires Pygments)
 
 It depends on the Pygments syntax highlighting library:
 http://pygments.org/
 
 There are the following configuration options::
 
   [web]
   pygments_style = <style> (default: colorful)
   highlightfiles = <fileset> (default: size('<5M'))
   highlightonlymatchfilename = <bool> (default False)
 
 ``highlightonlymatchfilename`` will only highlight files if their type could
 be identified by their filename. When this is not enabled (the default),
 Pygments will try very hard to identify the file type from content and any
 match (even matches with a low confidence score) will be used.
 """
 
 from __future__ import absolute_import
 
 from . import highlight
 from mercurial.hgweb import (
     webcommands,
     webutil,
 )
 
 from mercurial import (
     extensions,
+    pycompat,
 )
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
 def pygmentize(web, field, fctx, tmpl):
     style = web.config('web', 'pygments_style', 'colorful')
     expr = web.config('web', 'highlightfiles', "size('<5M')")
     filenameonly = web.configbool('web', 'highlightonlymatchfilename', False)
 
     ctx = fctx.changectx()
     m = ctx.matchfileset(expr)
     if m(fctx.path()):
         highlight.pygmentize(field, fctx, style, tmpl,
                 guessfilenameonly=filenameonly)
 
 def filerevision_highlight(orig, web, fctx):
     mt = web.res.headers['Content-Type']
     # only pygmentize for mimetype containing 'html' so we both match
     # 'text/html' and possibly 'application/xhtml+xml' in the future
     # so that we don't have to touch the extension when the mimetype
     # for a template changes; also hgweb optimizes the case that a
     # raw file is sent using rawfile() and doesn't call us, so we
     # can't clash with the file's content-type here in case we
     # pygmentize a html file
     if 'html' in mt:
         pygmentize(web, 'fileline', fctx, web.tmpl)
 
     return orig(web, fctx)
 
 def annotate_highlight(orig, web):
     mt = web.res.headers['Content-Type']
     if 'html' in mt:
         fctx = webutil.filectx(web.repo, web.req)
         pygmentize(web, 'annotateline', fctx, web.tmpl)
 
     return orig(web)
 
 def generate_css(web):
     pg_style = web.config('web', 'pygments_style', 'colorful')
-    fmter = highlight.HtmlFormatter(style=pg_style)
+    fmter = highlight.HtmlFormatter(style=pycompat.sysstr(pg_style))
     web.res.headers['Content-Type'] = 'text/css'
+    style_defs = fmter.get_style_defs(pycompat.sysstr(''))
     web.res.setbodybytes(''.join([
         '/* pygments_style = %s */\n\n' % pg_style,
-        fmter.get_style_defs(''),
+        pycompat.bytestr(style_defs),
     ]))
     return web.res.sendresponse()
 
 def extsetup(ui):
     # monkeypatch in the new version
     extensions.wrapfunction(webcommands, '_filerevision',
                             filerevision_highlight)
     extensions.wrapfunction(webcommands, 'annotate', annotate_highlight)
     webcommands.highlightcss = generate_css
     webcommands.__all__.append('highlightcss')

hgext/highlight/highlight.py

@@ -1,97 +1,99
 # highlight.py - highlight extension implementation file
 #
 #  Copyright 2007-2009 Adam Hupp <[e-mail]> 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 __future__ import absolute_import
 
 from mercurial import demandimport
 demandimport.IGNORES.update(['pkgutil', 'pkg_resources', '__main__'])
 
 from mercurial import (
     encoding,
+    pycompat,
 )
 
 from mercurial.utils import (
     stringutil,
 )
 
 with demandimport.deactivated():
     import pygments
     import pygments.formatters
     import pygments.lexers
     import pygments.plugin
     import pygments.util
 
     for unused in pygments.plugin.find_plugin_lexers():
         pass
 
 highlight = pygments.highlight
 ClassNotFound = pygments.util.ClassNotFound
 guess_lexer = pygments.lexers.guess_lexer
 guess_lexer_for_filename = pygments.lexers.guess_lexer_for_filename
 TextLexer = pygments.lexers.TextLexer
 HtmlFormatter = pygments.formatters.HtmlFormatter
 
 SYNTAX_CSS = ('\n<link rel="stylesheet" href="{url}highlightcss" '
               'type="text/css" />')
 
 def pygmentize(field, fctx, style, tmpl, guessfilenameonly=False):
 
     # append a <link ...> to the syntax highlighting css
     tmpl.load('header')
     old_header = tmpl.cache['header']
     if SYNTAX_CSS not in old_header:
         new_header = old_header + SYNTAX_CSS
         tmpl.cache['header'] = new_header
 
     text = fctx.data()
     if stringutil.binary(text):
         return
 
     # str.splitlines() != unicode.splitlines() because "reasons"
     for c in "\x0c\x1c\x1d\x1e":
         if c in text:
             text = text.replace(c, '')
 
     # Pygments is best used with Unicode strings:
     # <http://pygments.org/docs/unicode/>
-    text = text.decode(encoding.encoding, 'replace')
+    text = text.decode(pycompat.sysstr(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],
+        path = pycompat.sysstr(fctx.path())
+        lexer = guess_lexer_for_filename(path, text[:1024],
                                          stripnl=False)
     except (ClassNotFound, ValueError):
         # guess_lexer will return a lexer if *any* lexer matches. There is
         # no way to specify a minimum match score. This can give a high rate of
         # false positives on files with an unknown filename pattern.
         if guessfilenameonly:
             return
 
         try:
             lexer = guess_lexer(text[:1024], stripnl=False)
         except (ClassNotFound, ValueError):
             # Don't highlight unknown files
             return
 
     # Don't highlight text files
     if isinstance(lexer, TextLexer):
         return
 
-    formatter = HtmlFormatter(nowrap=True, style=style)
+    formatter = HtmlFormatter(nowrap=True, style=pycompat.sysstr(style))
 
     colorized = highlight(text, lexer, formatter)
-    coloriter = (s.encode(encoding.encoding, 'replace')
+    coloriter = (s.encode(pycompat.sysstr(encoding.encoding), 'replace')
                  for s in colorized.splitlines())
 
     tmpl._filters['colorize'] = lambda x: next(coloriter)
 
     oldl = tmpl.cache[field]
     newl = oldl.replace('line|escape', 'line|colorize')
     tmpl.cache[field] = newl