hgweb: pass ui to diffstatgen() explicitly

mercurial/hgweb/webutil.py

@@ -1,806 +1,806 b''
 # hgweb/webutil.py - utility library for the web interface.
 #
 # Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import copy
 import difflib
 import os
 import re
 
 from ..i18n import _
 from ..node import hex, nullid, short
 
 from .common import (
     ErrorResponse,
     HTTP_BAD_REQUEST,
     HTTP_NOT_FOUND,
     paritygen,
 )
 
 from .. import (
     context,
     error,
     match,
     mdiff,
     obsutil,
     patch,
     pathutil,
     pycompat,
     scmutil,
     templatefilters,
     templatekw,
     templateutil,
     ui as uimod,
     util,
 )
 
 from ..utils import (
     diffutil,
     stringutil,
 )
 
 archivespecs = util.sortdict((
     ('zip', ('application/zip', 'zip', '.zip', None)),
     ('gz', ('application/x-gzip', 'tgz', '.tar.gz', None)),
     ('bz2', ('application/x-bzip2', 'tbz2', '.tar.bz2', None)),
 ))
 
 def archivelist(ui, nodeid, url=None):
     allowed = ui.configlist('web', 'allow-archive', untrusted=True)
     archives = []
 
     for typ, spec in archivespecs.iteritems():
         if typ in allowed or ui.configbool('web', 'allow' + typ,
                                            untrusted=True):
             archives.append({
                 'type': typ,
                 'extension': spec[2],
                 'node': nodeid,
                 'url': url,
             })
 
     return templateutil.mappinglist(archives)
 
 def up(p):
     if p[0:1] != "/":
         p = "/" + p
     if p[-1:] == "/":
         p = p[:-1]
     up = os.path.dirname(p)
     if up == "/":
         return "/"
     return up + "/"
 
 def _navseq(step, firststep=None):
     if firststep:
         yield firststep
         if firststep >= 20 and firststep <= 40:
             firststep = 50
             yield firststep
         assert step > 0
         assert firststep > 0
         while step <= firststep:
             step *= 10
     while True:
         yield 1 * step
         yield 3 * step
         step *= 10
 
 class revnav(object):
 
     def __init__(self, repo):
         """Navigation generation object
 
         :repo: repo object we generate nav for
         """
         # used for hex generation
         self._revlog = repo.changelog
 
     def __nonzero__(self):
         """return True if any revision to navigate over"""
         return self._first() is not None
 
     __bool__ = __nonzero__
 
     def _first(self):
         """return the minimum non-filtered changeset or None"""
         try:
             return next(iter(self._revlog))
         except StopIteration:
             return None
 
     def hex(self, rev):
         return hex(self._revlog.node(rev))
 
     def gen(self, pos, pagelen, limit):
         """computes label and revision id for navigation link
 
         :pos: is the revision relative to which we generate navigation.
         :pagelen: the size of each navigation page
         :limit: how far shall we link
 
         The return is:
             - a single element mappinglist
             - containing a dictionary with a `before` and `after` key
             - values are dictionaries with `label` and `node` keys
         """
         if not self:
             # empty repo
             return templateutil.mappinglist([
                 {'before': templateutil.mappinglist([]),
                  'after': templateutil.mappinglist([])},
             ])
 
         targets = []
         for f in _navseq(1, pagelen):
             if f > limit:
                 break
             targets.append(pos + f)
             targets.append(pos - f)
         targets.sort()
 
         first = self._first()
         navbefore = [{'label': '(%i)' % first, 'node': self.hex(first)}]
         navafter = []
         for rev in targets:
             if rev not in self._revlog:
                 continue
             if pos < rev < limit:
                 navafter.append({'label': '+%d' % abs(rev - pos),
                                  'node': self.hex(rev)})
             if 0 < rev < pos:
                 navbefore.append({'label': '-%d' % abs(rev - pos),
                                   'node': self.hex(rev)})
 
         navafter.append({'label': 'tip', 'node': 'tip'})
 
         # TODO: maybe this can be a scalar object supporting tomap()
         return templateutil.mappinglist([
             {'before': templateutil.mappinglist(navbefore),
              'after': templateutil.mappinglist(navafter)},
         ])
 
 class filerevnav(revnav):
 
     def __init__(self, repo, path):
         """Navigation generation object
 
         :repo: repo object we generate nav for
         :path: path of the file we generate nav for
         """
         # used for iteration
         self._changelog = repo.unfiltered().changelog
         # used for hex generation
         self._revlog = repo.file(path)
 
     def hex(self, rev):
         return hex(self._changelog.node(self._revlog.linkrev(rev)))
 
 # TODO: maybe this can be a wrapper class for changectx/filectx list, which
 # yields {'ctx': ctx}
 def _ctxsgen(context, ctxs):
     for s in ctxs:
         d = {
             'node': s.hex(),
             'rev': s.rev(),
             'user': s.user(),
             'date': s.date(),
             'description': s.description(),
             'branch': s.branch(),
         }
         if util.safehasattr(s, 'path'):
             d['file'] = s.path()
         yield d
 
 def _siblings(siblings=None, hiderev=None):
     if siblings is None:
         siblings = []
     siblings = [s for s in siblings if s.node() != nullid]
     if len(siblings) == 1 and siblings[0].rev() == hiderev:
         siblings = []
     return templateutil.mappinggenerator(_ctxsgen, args=(siblings,))
 
 def difffeatureopts(req, ui, section):
     diffopts = diffutil.difffeatureopts(ui, untrusted=True,
                                         section=section, whitespace=True)
 
     for k in ('ignorews', 'ignorewsamount', 'ignorewseol', 'ignoreblanklines'):
         v = req.qsparams.get(k)
         if v is not None:
             v = stringutil.parsebool(v)
             setattr(diffopts, k, v if v is not None else True)
 
     return diffopts
 
 def annotate(req, fctx, ui):
     diffopts = difffeatureopts(req, ui, 'annotate')
     return fctx.annotate(follow=True, diffopts=diffopts)
 
 def parents(ctx, hide=None):
     if isinstance(ctx, context.basefilectx):
         introrev = ctx.introrev()
         if ctx.changectx().rev() != introrev:
             return _siblings([ctx.repo()[introrev]], hide)
     return _siblings(ctx.parents(), hide)
 
 def children(ctx, hide=None):
     return _siblings(ctx.children(), hide)
 
 def renamelink(fctx):
     r = fctx.renamed()
     if r:
         return templateutil.mappinglist([{'file': r[0], 'node': hex(r[1])}])
     return templateutil.mappinglist([])
 
 def nodetagsdict(repo, node):
     return templateutil.hybridlist(repo.nodetags(node), name='name')
 
 def nodebookmarksdict(repo, node):
     return templateutil.hybridlist(repo.nodebookmarks(node), name='name')
 
 def nodebranchdict(repo, ctx):
     branches = []
     branch = ctx.branch()
     # If this is an empty repo, ctx.node() == nullid,
     # ctx.branch() == 'default'.
     try:
         branchnode = repo.branchtip(branch)
     except error.RepoLookupError:
         branchnode = None
     if branchnode == ctx.node():
         branches.append(branch)
     return templateutil.hybridlist(branches, name='name')
 
 def nodeinbranch(repo, ctx):
     branches = []
     branch = ctx.branch()
     try:
         branchnode = repo.branchtip(branch)
     except error.RepoLookupError:
         branchnode = None
     if branch != 'default' and branchnode != ctx.node():
         branches.append(branch)
     return templateutil.hybridlist(branches, name='name')
 
 def nodebranchnodefault(ctx):
     branches = []
     branch = ctx.branch()
     if branch != 'default':
         branches.append(branch)
     return templateutil.hybridlist(branches, name='name')
 
 def _nodenamesgen(context, f, node, name):
     for t in f(node):
         yield {name: t}
 
 def showtag(repo, t1, node=nullid):
     args = (repo.nodetags, node, 'tag')
     return templateutil.mappinggenerator(_nodenamesgen, args=args, name=t1)
 
 def showbookmark(repo, t1, node=nullid):
     args = (repo.nodebookmarks, node, 'bookmark')
     return templateutil.mappinggenerator(_nodenamesgen, args=args, name=t1)
 
 def branchentries(repo, stripecount, limit=0):
     tips = []
     heads = repo.heads()
     parity = paritygen(stripecount)
     sortkey = lambda item: (not item[1], item[0].rev())
 
     def entries(context):
         count = 0
         if not tips:
             for tag, hs, tip, closed in repo.branchmap().iterbranches():
                 tips.append((repo[tip], closed))
         for ctx, closed in sorted(tips, key=sortkey, reverse=True):
             if limit > 0 and count >= limit:
                 return
             count += 1
             if closed:
                 status = 'closed'
             elif ctx.node() not in heads:
                 status = 'inactive'
             else:
                 status = 'open'
             yield {
                 'parity': next(parity),
                 'branch': ctx.branch(),
                 'status': status,
                 'node': ctx.hex(),
                 'date': ctx.date()
             }
 
     return templateutil.mappinggenerator(entries)
 
 def cleanpath(repo, path):
     path = path.lstrip('/')
     return pathutil.canonpath(repo.root, '', path)
 
 def changectx(repo, req):
     changeid = "tip"
     if 'node' in req.qsparams:
         changeid = req.qsparams['node']
         ipos = changeid.find(':')
         if ipos != -1:
             changeid = changeid[(ipos + 1):]
 
     return scmutil.revsymbol(repo, changeid)
 
 def basechangectx(repo, req):
     if 'node' in req.qsparams:
         changeid = req.qsparams['node']
         ipos = changeid.find(':')
         if ipos != -1:
             changeid = changeid[:ipos]
             return scmutil.revsymbol(repo, changeid)
 
     return None
 
 def filectx(repo, req):
     if 'file' not in req.qsparams:
         raise ErrorResponse(HTTP_NOT_FOUND, 'file not given')
     path = cleanpath(repo, req.qsparams['file'])
     if 'node' in req.qsparams:
         changeid = req.qsparams['node']
     elif 'filenode' in req.qsparams:
         changeid = req.qsparams['filenode']
     else:
         raise ErrorResponse(HTTP_NOT_FOUND, 'node or filenode not given')
     try:
         fctx = scmutil.revsymbol(repo, changeid)[path]
     except error.RepoError:
         fctx = repo.filectx(path, fileid=changeid)
 
     return fctx
 
 def linerange(req):
     linerange = req.qsparams.getall('linerange')
     if not linerange:
         return None
     if len(linerange) > 1:
         raise ErrorResponse(HTTP_BAD_REQUEST,
                             'redundant linerange parameter')
     try:
         fromline, toline = map(int, linerange[0].split(':', 1))
     except ValueError:
         raise ErrorResponse(HTTP_BAD_REQUEST,
                             'invalid linerange parameter')
     try:
         return util.processlinerange(fromline, toline)
     except error.ParseError as exc:
         raise ErrorResponse(HTTP_BAD_REQUEST, pycompat.bytestr(exc))
 
 def formatlinerange(fromline, toline):
     return '%d:%d' % (fromline + 1, toline)
 
 def _succsandmarkersgen(context, mapping):
     repo = context.resource(mapping, 'repo')
     itemmappings = templatekw.showsuccsandmarkers(context, mapping)
     for item in itemmappings.tovalue(context, mapping):
         item['successors'] = _siblings(repo[successor]
                                        for successor in item['successors'])
         yield item
 
 def succsandmarkers(context, mapping):
     return templateutil.mappinggenerator(_succsandmarkersgen, args=(mapping,))
 
 # teach templater succsandmarkers is switched to (context, mapping) API
 succsandmarkers._requires = {'repo', 'ctx'}
 
 def _whyunstablegen(context, mapping):
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
 
     entries = obsutil.whyunstable(repo, ctx)
     for entry in entries:
         if entry.get('divergentnodes'):
             entry['divergentnodes'] = _siblings(entry['divergentnodes'])
         yield entry
 
 def whyunstable(context, mapping):
     return templateutil.mappinggenerator(_whyunstablegen, args=(mapping,))
 
 whyunstable._requires = {'repo', 'ctx'}
 
 def commonentry(repo, ctx):
     node = ctx.node()
     return {
         # TODO: perhaps ctx.changectx() should be assigned if ctx is a
         # filectx, but I'm not pretty sure if that would always work because
         # fctx.parents() != fctx.changectx.parents() for example.
         'ctx': ctx,
         'rev': ctx.rev(),
         'node': hex(node),
         'author': ctx.user(),
         'desc': ctx.description(),
         'date': ctx.date(),
         'extra': ctx.extra(),
         'phase': ctx.phasestr(),
         'obsolete': ctx.obsolete(),
         'succsandmarkers': succsandmarkers,
         'instabilities': templateutil.hybridlist(ctx.instabilities(),
                                                  name='instability'),
         'whyunstable': whyunstable,
         'branch': nodebranchnodefault(ctx),
         'inbranch': nodeinbranch(repo, ctx),
         'branches': nodebranchdict(repo, ctx),
         'tags': nodetagsdict(repo, node),
         'bookmarks': nodebookmarksdict(repo, node),
         'parent': lambda **x: parents(ctx),
         'child': lambda **x: children(ctx),
     }
 
 def changelistentry(web, ctx):
     '''Obtain a dictionary to be used for entries in a changelist.
 
     This function is called when producing items for the "entries" list passed
     to the "shortlog" and "changelog" templates.
     '''
     repo = web.repo
     rev = ctx.rev()
     n = ctx.node()
     showtags = showtag(repo, 'changelogtag', n)
     files = listfilediffs(ctx.files(), n, web.maxfiles)
 
     entry = commonentry(repo, ctx)
     entry.update(
         allparents=lambda **x: parents(ctx),
         parent=lambda **x: parents(ctx, rev - 1),
         child=lambda **x: children(ctx, rev + 1),
         changelogtag=showtags,
         files=files,
     )
     return entry
 
 def changelistentries(web, revs, maxcount, parityfn):
     """Emit up to N records for an iterable of revisions."""
     repo = web.repo
 
     count = 0
     for rev in revs:
         if count >= maxcount:
             break
 
         count += 1
 
         entry = changelistentry(web, repo[rev])
         entry['parity'] = next(parityfn)
 
         yield entry
 
 def symrevorshortnode(req, ctx):
     if 'node' in req.qsparams:
         return templatefilters.revescape(req.qsparams['node'])
     else:
         return short(ctx.node())
 
 def _listfilesgen(context, ctx, stripecount):
     parity = paritygen(stripecount)
     for blockno, f in enumerate(ctx.files()):
         template = 'filenodelink' if f in ctx else 'filenolink'
         yield context.process(template, {
             'node': ctx.hex(),
             'file': f,
             'blockno': blockno + 1,
             'parity': next(parity),
         })
 
 def changesetentry(web, ctx):
     '''Obtain a dictionary to be used to render the "changeset" template.'''
 
     showtags = showtag(web.repo, 'changesettag', ctx.node())
     showbookmarks = showbookmark(web.repo, 'changesetbookmark', ctx.node())
     showbranch = nodebranchnodefault(ctx)
 
     basectx = basechangectx(web.repo, web.req)
     if basectx is None:
         basectx = ctx.p1()
 
     style = web.config('web', 'style')
     if 'style' in web.req.qsparams:
         style = web.req.qsparams['style']
 
     diff = diffs(web, ctx, basectx, None, style)
 
     parity = paritygen(web.stripecount)
-    diffstatsgen = diffstatgen(ctx, basectx)
+    diffstatsgen = diffstatgen(web.repo.ui, ctx, basectx)
     diffstats = diffstat(ctx, diffstatsgen, parity)
 
     return dict(
         diff=diff,
         symrev=symrevorshortnode(web.req, ctx),
         basenode=basectx.hex(),
         changesettag=showtags,
         changesetbookmark=showbookmarks,
         changesetbranch=showbranch,
         files=templateutil.mappedgenerator(_listfilesgen,
                                            args=(ctx, web.stripecount)),
         diffsummary=lambda **x: diffsummary(diffstatsgen),
         diffstat=diffstats,
         archives=web.archivelist(ctx.hex()),
         **pycompat.strkwargs(commonentry(web.repo, ctx)))
 
 def _listfilediffsgen(context, files, node, max):
     for f in files[:max]:
         yield context.process('filedifflink', {'node': hex(node), 'file': f})
     if len(files) > max:
         yield context.process('fileellipses', {})
 
 def listfilediffs(files, node, max):
     return templateutil.mappedgenerator(_listfilediffsgen,
                                         args=(files, node, max))
 
 def _prettyprintdifflines(context, lines, blockno, lineidprefix):
     for lineno, l in enumerate(lines, 1):
         difflineno = "%d.%d" % (blockno, lineno)
         if l.startswith('+'):
             ltype = "difflineplus"
         elif l.startswith('-'):
             ltype = "difflineminus"
         elif l.startswith('@'):
             ltype = "difflineat"
         else:
             ltype = "diffline"
         yield context.process(ltype, {
             'line': l,
             'lineno': lineno,
             'lineid': lineidprefix + "l%s" % difflineno,
             'linenumber': "% 8s" % difflineno,
         })
 
 def _diffsgen(context, repo, ctx, basectx, files, style, stripecount,
               linerange, lineidprefix):
     if files:
         m = match.exact(repo.root, repo.getcwd(), files)
     else:
         m = match.always(repo.root, repo.getcwd())
 
     diffopts = patch.diffopts(repo.ui, untrusted=True)
     node1 = basectx.node()
     node2 = ctx.node()
     parity = paritygen(stripecount)
 
     diffhunks = patch.diffhunks(repo, node1, node2, m, opts=diffopts)
     for blockno, (fctx1, fctx2, header, hunks) in enumerate(diffhunks, 1):
         if style != 'raw':
             header = header[1:]
         lines = [h + '\n' for h in header]
         for hunkrange, hunklines in hunks:
             if linerange is not None and hunkrange is not None:
                 s1, l1, s2, l2 = hunkrange
                 if not mdiff.hunkinrange((s2, l2), linerange):
                     continue
             lines.extend(hunklines)
         if lines:
             l = templateutil.mappedgenerator(_prettyprintdifflines,
                                              args=(lines, blockno,
                                                    lineidprefix))
             yield {
                 'parity': next(parity),
                 'blockno': blockno,
                 'lines': l,
             }
 
 def diffs(web, ctx, basectx, files, style, linerange=None, lineidprefix=''):
     args = (web.repo, ctx, basectx, files, style, web.stripecount,
             linerange, lineidprefix)
     return templateutil.mappinggenerator(_diffsgen, args=args, name='diffblock')
 
 def _compline(type, leftlineno, leftline, rightlineno, rightline):
     lineid = leftlineno and ("l%d" % leftlineno) or ''
     lineid += rightlineno and ("r%d" % rightlineno) or ''
     llno = '%d' % leftlineno if leftlineno else ''
     rlno = '%d' % rightlineno if rightlineno else ''
     return {
         'type': type,
         'lineid': lineid,
         'leftlineno': leftlineno,
         'leftlinenumber': "% 6s" % llno,
         'leftline': leftline or '',
         'rightlineno': rightlineno,
         'rightlinenumber': "% 6s" % rlno,
         'rightline': rightline or '',
     }
 
 def _getcompblockgen(context, leftlines, rightlines, opcodes):
     for type, llo, lhi, rlo, rhi in opcodes:
         len1 = lhi - llo
         len2 = rhi - rlo
         count = min(len1, len2)
         for i in xrange(count):
             yield _compline(type=type,
                             leftlineno=llo + i + 1,
                             leftline=leftlines[llo + i],
                             rightlineno=rlo + i + 1,
                             rightline=rightlines[rlo + i])
         if len1 > len2:
             for i in xrange(llo + count, lhi):
                 yield _compline(type=type,
                                 leftlineno=i + 1,
                                 leftline=leftlines[i],
                                 rightlineno=None,
                                 rightline=None)
         elif len2 > len1:
             for i in xrange(rlo + count, rhi):
                 yield _compline(type=type,
                                 leftlineno=None,
                                 leftline=None,
                                 rightlineno=i + 1,
                                 rightline=rightlines[i])
 
 def _getcompblock(leftlines, rightlines, opcodes):
     args = (leftlines, rightlines, opcodes)
     return templateutil.mappinggenerator(_getcompblockgen, args=args,
                                          name='comparisonline')
 
 def _comparegen(context, contextnum, leftlines, rightlines):
     '''Generator function that provides side-by-side comparison data.'''
     s = difflib.SequenceMatcher(None, leftlines, rightlines)
     if contextnum < 0:
         l = _getcompblock(leftlines, rightlines, s.get_opcodes())
         yield {'lines': l}
     else:
         for oc in s.get_grouped_opcodes(n=contextnum):
             l = _getcompblock(leftlines, rightlines, oc)
             yield {'lines': l}
 
 def compare(contextnum, leftlines, rightlines):
     args = (contextnum, leftlines, rightlines)
     return templateutil.mappinggenerator(_comparegen, args=args,
                                          name='comparisonblock')
 
-def diffstatgen(ctx, basectx):
+def diffstatgen(ui, ctx, basectx):
     '''Generator function that provides the diffstat data.'''
 
-    diffopts = patch.diffopts(ctx._repo.ui, {'noprefix': False})
+    diffopts = patch.diffopts(ui, {'noprefix': False})
     stats = patch.diffstatdata(
         util.iterlines(ctx.diff(basectx, opts=diffopts)))
     maxname, maxtotal, addtotal, removetotal, binary = patch.diffstatsum(stats)
     while True:
         yield stats, maxname, maxtotal, addtotal, removetotal, binary
 
 def diffsummary(statgen):
     '''Return a short summary of the diff.'''
 
     stats, maxname, maxtotal, addtotal, removetotal, binary = next(statgen)
     return _(' %d files changed, %d insertions(+), %d deletions(-)\n') % (
              len(stats), addtotal, removetotal)
 
 def _diffstattmplgen(context, ctx, statgen, parity):
     stats, maxname, maxtotal, addtotal, removetotal, binary = next(statgen)
     files = ctx.files()
 
     def pct(i):
         if maxtotal == 0:
             return 0
         return (float(i) / maxtotal) * 100
 
     fileno = 0
     for filename, adds, removes, isbinary in stats:
         template = 'diffstatlink' if filename in files else 'diffstatnolink'
         total = adds + removes
         fileno += 1
         yield context.process(template, {
             'node': ctx.hex(),
             'file': filename,
             'fileno': fileno,
             'total': total,
             'addpct': pct(adds),
             'removepct': pct(removes),
             'parity': next(parity),
         })
 
 def diffstat(ctx, statgen, parity):
     '''Return a diffstat template for each file in the diff.'''
     args = (ctx, statgen, parity)
     return templateutil.mappedgenerator(_diffstattmplgen, args=args)
 
 class sessionvars(templateutil.wrapped):
     def __init__(self, vars, start='?'):
         self._start = start
         self._vars = vars
 
     def __getitem__(self, key):
         return self._vars[key]
 
     def __setitem__(self, key, value):
         self._vars[key] = value
 
     def __copy__(self):
         return sessionvars(copy.copy(self._vars), self._start)
 
     def contains(self, context, mapping, item):
         item = templateutil.unwrapvalue(context, mapping, item)
         return item in self._vars
 
     def getmember(self, context, mapping, key):
         key = templateutil.unwrapvalue(context, mapping, key)
         return self._vars.get(key)
 
     def getmin(self, context, mapping):
         raise error.ParseError(_('not comparable'))
 
     def getmax(self, context, mapping):
         raise error.ParseError(_('not comparable'))
 
     def filter(self, context, mapping, select):
         # implement if necessary
         raise error.ParseError(_('not filterable'))
 
     def itermaps(self, context):
         separator = self._start
         for key, value in sorted(self._vars.iteritems()):
             yield {'name': key,
                    'value': pycompat.bytestr(value),
                    'separator': separator,
             }
             separator = '&'
 
     def join(self, context, mapping, sep):
         # could be '{separator}{name}={value|urlescape}'
         raise error.ParseError(_('not displayable without template'))
 
     def show(self, context, mapping):
         return self.join(context, '')
 
     def tobool(self, context, mapping):
         return bool(self._vars)
 
     def tovalue(self, context, mapping):
         return self._vars
 
 class wsgiui(uimod.ui):
     # default termwidth breaks under mod_wsgi
     def termwidth(self):
         return 80
 
 def getwebsubs(repo):
     websubtable = []
     websubdefs = repo.ui.configitems('websub')
     # we must maintain interhg backwards compatibility
     websubdefs += repo.ui.configitems('interhg')
     for key, pattern in websubdefs:
         # grab the delimiter from the character after the "s"
         unesc = pattern[1:2]
         delim = stringutil.reescape(unesc)
 
         # identify portions of the pattern, taking care to avoid escaped
         # delimiters. the replace format and flags are optional, but
         # delimiters are required.
         match = re.match(
             br'^s%s(.+)(?:(?<=\\\\)|(?<!\\))%s(.*)%s([ilmsux])*$'
             % (delim, delim, delim), pattern)
         if not match:
             repo.ui.warn(_("websub: invalid pattern for %s: %s\n")
                               % (key, pattern))
             continue
 
         # we need to unescape the delimiter for regexp and format
         delim_re = re.compile(br'(?<!\\)\\%s' % delim)
         regexp = delim_re.sub(unesc, match.group(1))
         format = delim_re.sub(unesc, match.group(2))
 
         # the pattern allows for 6 regexp flags, so set them if necessary
         flagin = match.group(3)
         flags = 0
         if flagin:
             for flag in flagin.upper():
                 flags |= re.__dict__[flag]
 
         try:
             regexp = re.compile(regexp, flags)
             websubtable.append((regexp, format))
         except re.error:
             repo.ui.warn(_("websub: invalid regexp for %s: %s\n")
                          % (key, regexp))
     return websubtable
 
 def getgraphnode(repo, ctx):
     return (templatekw.getgraphnodecurrent(repo, ctx) +
             templatekw.getgraphnodesymbol(ctx))