templatekw: switch remainder of _showlist template keywords to new API

hgext/lfs/__init__.py

@@ -1,390 +1,391
 # lfs - hash-preserving large file support using Git-LFS protocol
 #
 # Copyright 2017 Facebook, Inc.
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 """lfs - large file support (EXPERIMENTAL)
 
 This extension allows large files to be tracked outside of the normal
 repository storage and stored on a centralized server, similar to the
 ``largefiles`` extension.  The ``git-lfs`` protocol is used when
 communicating with the server, so existing git infrastructure can be
 harnessed.  Even though the files are stored outside of the repository,
 they are still integrity checked in the same manner as normal files.
 
 The files stored outside of the repository are downloaded on demand,
 which reduces the time to clone, and possibly the local disk usage.
 This changes fundamental workflows in a DVCS, so careful thought
 should be given before deploying it.  :hg:`convert` can be used to
 convert LFS repositories to normal repositories that no longer
 require this extension, and do so without changing the commit hashes.
 This allows the extension to be disabled if the centralized workflow
 becomes burdensome.  However, the pre and post convert clones will
 not be able to communicate with each other unless the extension is
 enabled on both.
 
 To start a new repository, or to add LFS files to an existing one, just
 create an ``.hglfs`` file as described below in the root directory of
 the repository.  Typically, this file should be put under version
 control, so that the settings will propagate to other repositories with
 push and pull.  During any commit, Mercurial will consult this file to
 determine if an added or modified file should be stored externally.  The
 type of storage depends on the characteristics of the file at each
 commit.  A file that is near a size threshold may switch back and forth
 between LFS and normal storage, as needed.
 
 Alternately, both normal repositories and largefile controlled
 repositories can be converted to LFS by using :hg:`convert` and the
 ``lfs.track`` config option described below.  The ``.hglfs`` file
 should then be created and added, to control subsequent LFS selection.
 The hashes are also unchanged in this case.  The LFS and non-LFS
 repositories can be distinguished because the LFS repository will
 abort any command if this extension is disabled.
 
 Committed LFS files are held locally, until the repository is pushed.
 Prior to pushing the normal repository data, the LFS files that are
 tracked by the outgoing commits are automatically uploaded to the
 configured central server.  No LFS files are transferred on
 :hg:`pull` or :hg:`clone`.  Instead, the files are downloaded on
 demand as they need to be read, if a cached copy cannot be found
 locally.  Both committing and downloading an LFS file will link the
 file to a usercache, to speed up future access.  See the `usercache`
 config setting described below.
 
 .hglfs::
 
     The extension reads its configuration from a versioned ``.hglfs``
     configuration file found in the root of the working directory. The
     ``.hglfs`` file uses the same syntax as all other Mercurial
     configuration files. It uses a single section, ``[track]``.
 
     The ``[track]`` section specifies which files are stored as LFS (or
     not). Each line is keyed by a file pattern, with a predicate value.
     The first file pattern match is used, so put more specific patterns
     first.  The available predicates are ``all()``, ``none()``, and
     ``size()``. See "hg help filesets.size" for the latter.
 
     Example versioned ``.hglfs`` file::
 
       [track]
       # No Makefile or python file, anywhere, will be LFS
       **Makefile = none()
       **.py = none()
 
       **.zip = all()
       **.exe = size(">1MB")
 
       # Catchall for everything not matched above
       ** = size(">10MB")
 
 Configs::
 
     [lfs]
     # Remote endpoint. Multiple protocols are supported:
     # - http(s)://user:[e-mail]/path
     #   git-lfs endpoint
     # - file:///tmp/path
     #   local filesystem, usually for testing
     # if unset, lfs will prompt setting this when it must use this value.
     # (default: unset)
     url = https://example.com/repo.git/info/lfs
 
     # Which files to track in LFS.  Path tests are "**.extname" for file
     # extensions, and "path:under/some/directory" for path prefix.  Both
     # are relative to the repository root.
     # File size can be tested with the "size()" fileset, and tests can be
     # joined with fileset operators.  (See "hg help filesets.operators".)
     #
     # Some examples:
     # - all()                       # everything
     # - none()                      # nothing
     # - size(">20MB")               # larger than 20MB
     # - !**.txt                     # anything not a *.txt file
     # - **.zip | **.tar.gz | **.7z  # some types of compressed files
     # - path:bin                    # files under "bin" in the project root
     # - (**.php & size(">2MB")) | (**.js & size(">5MB")) | **.tar.gz
     #     | (path:bin & !path:/bin/README) | size(">1GB")
     # (default: none())
     #
     # This is ignored if there is a tracked '.hglfs' file, and this setting
     # will eventually be deprecated and removed.
     track = size(">10M")
 
     # how many times to retry before giving up on transferring an object
     retry = 5
 
     # the local directory to store lfs files for sharing across local clones.
     # If not set, the cache is located in an OS specific cache location.
     usercache = /path/to/global/cache
 """
 
 from __future__ import absolute_import
 
 from mercurial.i18n import _
 
 from mercurial import (
     bundle2,
     changegroup,
     cmdutil,
     config,
     context,
     error,
     exchange,
     extensions,
     filelog,
     fileset,
     hg,
     localrepo,
     minifileset,
     node,
     pycompat,
     registrar,
     revlog,
     scmutil,
     templatekw,
     upgrade,
     util,
     vfs as vfsmod,
     wireproto,
 )
 
 from . import (
     blobstore,
     wrapper,
 )
 
 # 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'
 
 configtable = {}
 configitem = registrar.configitem(configtable)
 
 configitem('experimental', 'lfs.user-agent',
     default=None,
 )
 configitem('experimental', 'lfs.worker-enable',
     default=False,
 )
 
 configitem('lfs', 'url',
     default=None,
 )
 configitem('lfs', 'usercache',
     default=None,
 )
 # Deprecated
 configitem('lfs', 'threshold',
     default=None,
 )
 configitem('lfs', 'track',
     default='none()',
 )
 configitem('lfs', 'retry',
     default=5,
 )
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 
 templatekeyword = registrar.templatekeyword()
 filesetpredicate = registrar.filesetpredicate()
 
 def featuresetup(ui, supported):
     # don't die on seeing a repo with the lfs requirement
     supported |= {'lfs'}
 
 def uisetup(ui):
     localrepo.localrepository.featuresetupfuncs.add(featuresetup)
 
 def reposetup(ui, repo):
     # Nothing to do with a remote repo
     if not repo.local():
         return
 
     repo.svfs.lfslocalblobstore = blobstore.local(repo)
     repo.svfs.lfsremoteblobstore = blobstore.remote(repo)
 
     class lfsrepo(repo.__class__):
         @localrepo.unfilteredmethod
         def commitctx(self, ctx, error=False):
             repo.svfs.options['lfstrack'] = _trackedmatcher(self)
             return super(lfsrepo, self).commitctx(ctx, error)
 
     repo.__class__ = lfsrepo
 
     if 'lfs' not in repo.requirements:
         def checkrequireslfs(ui, repo, **kwargs):
             if 'lfs' not in repo.requirements:
                 last = kwargs.get(r'node_last')
                 _bin = node.bin
                 if last:
                     s = repo.set('%n:%n', _bin(kwargs[r'node']), _bin(last))
                 else:
                     s = repo.set('%n', _bin(kwargs[r'node']))
             for ctx in s:
                 # TODO: is there a way to just walk the files in the commit?
                 if any(ctx[f].islfs() for f in ctx.files() if f in ctx):
                     repo.requirements.add('lfs')
                     repo._writerequirements()
                     repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
                     break
 
         ui.setconfig('hooks', 'commit.lfs', checkrequireslfs, 'lfs')
         ui.setconfig('hooks', 'pretxnchangegroup.lfs', checkrequireslfs, 'lfs')
     else:
         repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
 
 def _trackedmatcher(repo):
     """Return a function (path, size) -> bool indicating whether or not to
     track a given file with lfs."""
     if not repo.wvfs.exists('.hglfs'):
         # No '.hglfs' in wdir.  Fallback to config for now.
         trackspec = repo.ui.config('lfs', 'track')
 
         # deprecated config: lfs.threshold
         threshold = repo.ui.configbytes('lfs', 'threshold')
         if threshold:
             fileset.parse(trackspec)  # make sure syntax errors are confined
             trackspec = "(%s) | size('>%d')" % (trackspec, threshold)
 
         return minifileset.compile(trackspec)
 
     data = repo.wvfs.tryread('.hglfs')
     if not data:
         return lambda p, s: False
 
     # Parse errors here will abort with a message that points to the .hglfs file
     # and line number.
     cfg = config.config()
     cfg.parse('.hglfs', data)
 
     try:
         rules = [(minifileset.compile(pattern), minifileset.compile(rule))
                  for pattern, rule in cfg.items('track')]
     except error.ParseError as e:
         # The original exception gives no indicator that the error is in the
         # .hglfs file, so add that.
 
         # TODO: See if the line number of the file can be made available.
         raise error.Abort(_('parse error in .hglfs: %s') % e)
 
     def _match(path, size):
         for pat, rule in rules:
             if pat(path, size):
                 return rule(path, size)
 
         return False
 
     return _match
 
 def wrapfilelog(filelog):
     wrapfunction = extensions.wrapfunction
 
     wrapfunction(filelog, 'addrevision', wrapper.filelogaddrevision)
     wrapfunction(filelog, 'renamed', wrapper.filelogrenamed)
     wrapfunction(filelog, 'size', wrapper.filelogsize)
 
 def extsetup(ui):
     wrapfilelog(filelog.filelog)
 
     wrapfunction = extensions.wrapfunction
 
     wrapfunction(cmdutil, '_updatecatformatter', wrapper._updatecatformatter)
     wrapfunction(scmutil, 'wrapconvertsink', wrapper.convertsink)
 
     wrapfunction(upgrade, '_finishdatamigration',
                  wrapper.upgradefinishdatamigration)
 
     wrapfunction(upgrade, 'preservedrequirements',
                  wrapper.upgraderequirements)
 
     wrapfunction(upgrade, 'supporteddestrequirements',
                  wrapper.upgraderequirements)
 
     wrapfunction(changegroup,
                  'supportedoutgoingversions',
                  wrapper.supportedoutgoingversions)
     wrapfunction(changegroup,
                  'allsupportedversions',
                  wrapper.allsupportedversions)
 
     wrapfunction(exchange, 'push', wrapper.push)
     wrapfunction(wireproto, '_capabilities', wrapper._capabilities)
 
     wrapfunction(context.basefilectx, 'cmp', wrapper.filectxcmp)
     wrapfunction(context.basefilectx, 'isbinary', wrapper.filectxisbinary)
     context.basefilectx.islfs = wrapper.filectxislfs
 
     revlog.addflagprocessor(
         revlog.REVIDX_EXTSTORED,
         (
             wrapper.readfromstore,
             wrapper.writetostore,
             wrapper.bypasscheckhash,
         ),
     )
 
     wrapfunction(hg, 'clone', wrapper.hgclone)
     wrapfunction(hg, 'postshare', wrapper.hgpostshare)
 
     scmutil.fileprefetchhooks.add('lfs', wrapper._prefetchfiles)
 
     # Make bundle choose changegroup3 instead of changegroup2. This affects
     # "hg bundle" command. Note: it does not cover all bundle formats like
     # "packed1". Using "packed1" with lfs will likely cause trouble.
     names = [k for k, v in exchange._bundlespeccgversions.items() if v == '02']
     for k in names:
         exchange._bundlespeccgversions[k] = '03'
 
     # bundlerepo uses "vfsmod.readonlyvfs(othervfs)", we need to make sure lfs
     # options and blob stores are passed from othervfs to the new readonlyvfs.
     wrapfunction(vfsmod.readonlyvfs, '__init__', wrapper.vfsinit)
 
     # when writing a bundle via "hg bundle" command, upload related LFS blobs
     wrapfunction(bundle2, 'writenewbundle', wrapper.writenewbundle)
 
 @filesetpredicate('lfs()', callstatus=True)
 def lfsfileset(mctx, x):
     """File that uses LFS storage."""
     # i18n: "lfs" is a keyword
     fileset.getargs(x, 0, 0, _("lfs takes no arguments"))
     return [f for f in mctx.subset
             if wrapper.pointerfromctx(mctx.ctx, f, removed=True) is not None]
 
-@templatekeyword('lfs_files')
-def lfsfiles(repo, ctx, **args):
+@templatekeyword('lfs_files', requires={'ctx', 'templ'})
+def lfsfiles(context, mapping):
     """List of strings. All files modified, added, or removed by this
     changeset."""
-    args = pycompat.byteskwargs(args)
+    ctx = context.resource(mapping, 'ctx')
+    templ = context.resource(mapping, 'templ')
 
     pointers = wrapper.pointersfromctx(ctx, removed=True) # {path: pointer}
     files = sorted(pointers.keys())
 
     def pointer(v):
         # In the file spec, version is first and the other keys are sorted.
         sortkeyfunc = lambda x: (x[0] != 'version', x)
         items = sorted(pointers[v].iteritems(), key=sortkeyfunc)
         return util.sortdict(items)
 
     makemap = lambda v: {
         'file': v,
         'lfsoid': pointers[v].oid() if pointers[v] else None,
         'lfspointer': templatekw.hybriddict(pointer(v)),
     }
 
     # TODO: make the separator ', '?
-    f = templatekw._showlist('lfs_file', files, args['templ'], args)
+    f = templatekw._showlist('lfs_file', files, templ, mapping)
     return templatekw._hybrid(f, files, makemap, pycompat.identity)
 
 @command('debuglfsupload',
          [('r', 'rev', [], _('upload large files introduced by REV'))])
 def debuglfsupload(ui, repo, **opts):
     """upload lfs blobs added by the working copy parent or given revisions"""
     revs = opts.get(r'rev', [])
     pointers = wrapper.extractpointers(repo, scmutil.revrange(repo, revs))
     wrapper.uploadblobs(repo, pointers)

mercurial/templatekw.py

@@ -1,985 +1,987
 # templatekw.py - common changeset template keywords
 #
 # Copyright 2005-2009 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
 
 from .i18n import _
 from .node import (
     hex,
     nullid,
 )
 
 from . import (
     encoding,
     error,
     hbisect,
     i18n,
     obsutil,
     patch,
     pycompat,
     registrar,
     scmutil,
     util,
 )
 
 class _hybrid(object):
     """Wrapper for list or dict to support legacy template
 
     This class allows us to handle both:
     - "{files}" (legacy command-line-specific list hack) and
     - "{files % '{file}\n'}" (hgweb-style with inlining and function support)
     and to access raw values:
     - "{ifcontains(file, files, ...)}", "{ifcontains(key, extras, ...)}"
     - "{get(extras, key)}"
     - "{files|json}"
     """
 
     def __init__(self, gen, values, makemap, joinfmt, keytype=None):
         if gen is not None:
             self.gen = gen  # generator or function returning generator
         self._values = values
         self._makemap = makemap
         self.joinfmt = joinfmt
         self.keytype = keytype  # hint for 'x in y' where type(x) is unresolved
     def gen(self):
         """Default generator to stringify this as {join(self, ' ')}"""
         for i, x in enumerate(self._values):
             if i > 0:
                 yield ' '
             yield self.joinfmt(x)
     def itermaps(self):
         makemap = self._makemap
         for x in self._values:
             yield makemap(x)
     def __contains__(self, x):
         return x in self._values
     def __getitem__(self, key):
         return self._values[key]
     def __len__(self):
         return len(self._values)
     def __iter__(self):
         return iter(self._values)
     def __getattr__(self, name):
         if name not in (r'get', r'items', r'iteritems', r'iterkeys',
                         r'itervalues', r'keys', r'values'):
             raise AttributeError(name)
         return getattr(self._values, name)
 
 class _mappable(object):
     """Wrapper for non-list/dict object to support map operation
 
     This class allows us to handle both:
     - "{manifest}"
     - "{manifest % '{rev}:{node}'}"
     - "{manifest.rev}"
 
     Unlike a _hybrid, this does not simulate the behavior of the underling
     value. Use unwrapvalue() or unwraphybrid() to obtain the inner object.
     """
 
     def __init__(self, gen, key, value, makemap):
         if gen is not None:
             self.gen = gen  # generator or function returning generator
         self._key = key
         self._value = value  # may be generator of strings
         self._makemap = makemap
 
     def gen(self):
         yield pycompat.bytestr(self._value)
 
     def tomap(self):
         return self._makemap(self._key)
 
     def itermaps(self):
         yield self.tomap()
 
 def hybriddict(data, key='key', value='value', fmt='%s=%s', gen=None):
     """Wrap data to support both dict-like and string-like operations"""
     return _hybrid(gen, data, lambda k: {key: k, value: data[k]},
                    lambda k: fmt % (k, data[k]))
 
 def hybridlist(data, name, fmt='%s', gen=None):
     """Wrap data to support both list-like and string-like operations"""
     return _hybrid(gen, data, lambda x: {name: x}, lambda x: fmt % x)
 
 def unwraphybrid(thing):
     """Return an object which can be stringified possibly by using a legacy
     template"""
     gen = getattr(thing, 'gen', None)
     if gen is None:
         return thing
     if callable(gen):
         return gen()
     return gen
 
 def unwrapvalue(thing):
     """Move the inner value object out of the wrapper"""
     if not util.safehasattr(thing, '_value'):
         return thing
     return thing._value
 
 def wraphybridvalue(container, key, value):
     """Wrap an element of hybrid container to be mappable
 
     The key is passed to the makemap function of the given container, which
     should be an item generated by iter(container).
     """
     makemap = getattr(container, '_makemap', None)
     if makemap is None:
         return value
     if util.safehasattr(value, '_makemap'):
         # a nested hybrid list/dict, which has its own way of map operation
         return value
     return _mappable(None, key, value, makemap)
 
 def compatdict(context, mapping, name, data, key='key', value='value',
                fmt='%s=%s', plural=None, separator=' '):
     """Wrap data like hybriddict(), but also supports old-style list template
 
     This exists for backward compatibility with the old-style template. Use
     hybriddict() for new template keywords.
     """
     c = [{key: k, value: v} for k, v in data.iteritems()]
     t = context.resource(mapping, 'templ')
     f = _showlist(name, c, t, mapping, plural, separator)
     return hybriddict(data, key=key, value=value, fmt=fmt, gen=f)
 
 def compatlist(context, mapping, name, data, element=None, fmt='%s',
                plural=None, separator=' '):
     """Wrap data like hybridlist(), but also supports old-style list template
 
     This exists for backward compatibility with the old-style template. Use
     hybridlist() for new template keywords.
     """
     t = context.resource(mapping, 'templ')
     f = _showlist(name, data, t, mapping, plural, separator)
     return hybridlist(data, name=element or name, fmt=fmt, gen=f)
 
 def showdict(name, data, mapping, plural=None, key='key', value='value',
              fmt='%s=%s', separator=' '):
     c = [{key: k, value: v} for k, v in data.iteritems()]
     f = _showlist(name, c, mapping['templ'], mapping, plural, separator)
     return hybriddict(data, key=key, value=value, fmt=fmt, gen=f)
 
 def showlist(name, values, mapping, plural=None, element=None, separator=' '):
     if not element:
         element = name
     f = _showlist(name, values, mapping['templ'], mapping, plural, separator)
     return hybridlist(values, name=element, gen=f)
 
 def _showlist(name, values, templ, mapping, plural=None, separator=' '):
     '''expand set of values.
     name is name of key in template map.
     values is list of strings or dicts.
     plural is plural of name, if not simply name + 's'.
     separator is used to join values as a string
 
     expansion works like this, given name 'foo'.
 
     if values is empty, expand 'no_foos'.
 
     if 'foo' not in template map, return values as a string,
     joined by 'separator'.
 
     expand 'start_foos'.
 
     for each value, expand 'foo'. if 'last_foo' in template
     map, expand it instead of 'foo' for last key.
 
     expand 'end_foos'.
     '''
     strmapping = pycompat.strkwargs(mapping)
     if not plural:
         plural = name + 's'
     if not values:
         noname = 'no_' + plural
         if noname in templ:
             yield templ(noname, **strmapping)
         return
     if name not in templ:
         if isinstance(values[0], bytes):
             yield separator.join(values)
         else:
             for v in values:
                 r = dict(v)
                 r.update(mapping)
                 yield r
         return
     startname = 'start_' + plural
     if startname in templ:
         yield templ(startname, **strmapping)
     vmapping = mapping.copy()
     def one(v, tag=name):
         try:
             vmapping.update(v)
         # Python 2 raises ValueError if the type of v is wrong. Python
         # 3 raises TypeError.
         except (AttributeError, TypeError, ValueError):
             try:
                 # Python 2 raises ValueError trying to destructure an e.g.
                 # bytes. Python 3 raises TypeError.
                 for a, b in v:
                     vmapping[a] = b
             except (TypeError, ValueError):
                 vmapping[name] = v
         return templ(tag, **pycompat.strkwargs(vmapping))
     lastname = 'last_' + name
     if lastname in templ:
         last = values.pop()
     else:
         last = None
     for v in values:
         yield one(v)
     if last is not None:
         yield one(last, tag=lastname)
     endname = 'end_' + plural
     if endname in templ:
         yield templ(endname, **strmapping)
 
 def getlatesttags(context, mapping, pattern=None):
     '''return date, distance and name for the latest tag of rev'''
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     cache = context.resource(mapping, 'cache')
 
     cachename = 'latesttags'
     if pattern is not None:
         cachename += '-' + pattern
         match = util.stringmatcher(pattern)[2]
     else:
         match = util.always
 
     if cachename not in cache:
         # Cache mapping from rev to a tuple with tag date, tag
         # distance and tag name
         cache[cachename] = {-1: (0, 0, ['null'])}
     latesttags = cache[cachename]
 
     rev = ctx.rev()
     todo = [rev]
     while todo:
         rev = todo.pop()
         if rev in latesttags:
             continue
         ctx = repo[rev]
         tags = [t for t in ctx.tags()
                 if (repo.tagtype(t) and repo.tagtype(t) != 'local'
                     and match(t))]
         if tags:
             latesttags[rev] = ctx.date()[0], 0, [t for t in sorted(tags)]
             continue
         try:
             ptags = [latesttags[p.rev()] for p in ctx.parents()]
             if len(ptags) > 1:
                 if ptags[0][2] == ptags[1][2]:
                     # The tuples are laid out so the right one can be found by
                     # comparison in this case.
                     pdate, pdist, ptag = max(ptags)
                 else:
                     def key(x):
                         changessincetag = len(repo.revs('only(%d, %s)',
                                                         ctx.rev(), x[2][0]))
                         # Smallest number of changes since tag wins. Date is
                         # used as tiebreaker.
                         return [-changessincetag, x[0]]
                     pdate, pdist, ptag = max(ptags, key=key)
             else:
                 pdate, pdist, ptag = ptags[0]
         except KeyError:
             # Cache miss - recurse
             todo.append(rev)
             todo.extend(p.rev() for p in ctx.parents())
             continue
         latesttags[rev] = pdate, pdist + 1, ptag
     return latesttags[rev]
 
 def getrenamedfn(repo, endrev=None):
     rcache = {}
     if endrev is None:
         endrev = len(repo)
 
     def getrenamed(fn, rev):
         '''looks up all renames for a file (up to endrev) the first
         time the file is given. It indexes on the changerev and only
         parses the manifest if linkrev != changerev.
         Returns rename info for fn at changerev rev.'''
         if fn not in rcache:
             rcache[fn] = {}
             fl = repo.file(fn)
             for i in fl:
                 lr = fl.linkrev(i)
                 renamed = fl.renamed(fl.node(i))
                 rcache[fn][lr] = renamed
                 if lr >= endrev:
                     break
         if rev in rcache[fn]:
             return rcache[fn][rev]
 
         # If linkrev != rev (i.e. rev not found in rcache) fallback to
         # filectx logic.
         try:
             return repo[rev][fn].renamed()
         except error.LookupError:
             return None
 
     return getrenamed
 
 def getlogcolumns():
     """Return a dict of log column labels"""
     _ = pycompat.identity  # temporarily disable gettext
     # i18n: column positioning for "hg log"
     columns = _('bookmark:    %s\n'
                 'branch:      %s\n'
                 'changeset:   %s\n'
                 'copies:      %s\n'
                 'date:        %s\n'
                 'extra:       %s=%s\n'
                 'files+:      %s\n'
                 'files-:      %s\n'
                 'files:       %s\n'
                 'instability: %s\n'
                 'manifest:    %s\n'
                 'obsolete:    %s\n'
                 'parent:      %s\n'
                 'phase:       %s\n'
                 'summary:     %s\n'
                 'tag:         %s\n'
                 'user:        %s\n')
     return dict(zip([s.split(':', 1)[0] for s in columns.splitlines()],
                     i18n._(columns).splitlines(True)))
 
 # default templates internally used for rendering of lists
 defaulttempl = {
     'parent': '{rev}:{node|formatnode} ',
     'manifest': '{rev}:{node|formatnode}',
     'file_copy': '{name} ({source})',
     'envvar': '{key}={value}',
     'extra': '{key}={value|stringescape}'
 }
 # filecopy is preserved for compatibility reasons
 defaulttempl['filecopy'] = defaulttempl['file_copy']
 
 # keywords are callables (see registrar.templatekeyword for details)
 keywords = {}
 templatekeyword = registrar.templatekeyword(keywords)
 
 @templatekeyword('author', requires={'ctx'})
 def showauthor(context, mapping):
     """String. The unmodified author of the changeset."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.user()
 
 @templatekeyword('bisect', requires={'repo', 'ctx'})
 def showbisect(context, mapping):
     """String. The changeset bisection status."""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     return hbisect.label(repo, ctx.node())
 
 @templatekeyword('branch', requires={'ctx'})
 def showbranch(context, mapping):
     """String. The name of the branch on which the changeset was
     committed.
     """
     ctx = context.resource(mapping, 'ctx')
     return ctx.branch()
 
 @templatekeyword('branches', requires={'ctx', 'templ'})
 def showbranches(context, mapping):
     """List of strings. The name of the branch on which the
     changeset was committed. Will be empty if the branch name was
     default. (DEPRECATED)
     """
     ctx = context.resource(mapping, 'ctx')
     branch = ctx.branch()
     if branch != 'default':
         return compatlist(context, mapping, 'branch', [branch],
                           plural='branches')
     return compatlist(context, mapping, 'branch', [], plural='branches')
 
-@templatekeyword('bookmarks')
-def showbookmarks(**args):
+@templatekeyword('bookmarks', requires={'repo', 'ctx', 'templ'})
+def showbookmarks(context, mapping):
     """List of strings. Any bookmarks associated with the
     changeset. Also sets 'active', the name of the active bookmark.
     """
-    args = pycompat.byteskwargs(args)
-    repo = args['ctx']._repo
-    bookmarks = args['ctx'].bookmarks()
+    repo = context.resource(mapping, 'repo')
+    ctx = context.resource(mapping, 'ctx')
+    templ = context.resource(mapping, 'templ')
+    bookmarks = ctx.bookmarks()
     active = repo._activebookmark
     makemap = lambda v: {'bookmark': v, 'active': active, 'current': active}
-    f = _showlist('bookmark', bookmarks, args['templ'], args)
+    f = _showlist('bookmark', bookmarks, templ, mapping)
     return _hybrid(f, bookmarks, makemap, pycompat.identity)
 
 @templatekeyword('children', requires={'ctx', 'templ'})
 def showchildren(context, mapping):
     """List of strings. The children of the changeset."""
     ctx = context.resource(mapping, 'ctx')
     childrevs = ['%d:%s' % (cctx.rev(), cctx) for cctx in ctx.children()]
     return compatlist(context, mapping, 'children', childrevs, element='child')
 
 # Deprecated, but kept alive for help generation a purpose.
 @templatekeyword('currentbookmark', requires={'repo', 'ctx'})
 def showcurrentbookmark(context, mapping):
     """String. The active bookmark, if it is associated with the changeset.
     (DEPRECATED)"""
     return showactivebookmark(context, mapping)
 
 @templatekeyword('activebookmark', requires={'repo', 'ctx'})
 def showactivebookmark(context, mapping):
     """String. The active bookmark, if it is associated with the changeset."""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     active = repo._activebookmark
     if active and active in ctx.bookmarks():
         return active
     return ''
 
 @templatekeyword('date', requires={'ctx'})
 def showdate(context, mapping):
     """Date information. The date when the changeset was committed."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.date()
 
 @templatekeyword('desc', requires={'ctx'})
 def showdescription(context, mapping):
     """String. The text of the changeset description."""
     ctx = context.resource(mapping, 'ctx')
     s = ctx.description()
     if isinstance(s, encoding.localstr):
         # try hard to preserve utf-8 bytes
         return encoding.tolocal(encoding.fromlocal(s).strip())
     else:
         return s.strip()
 
 @templatekeyword('diffstat', requires={'ctx'})
 def showdiffstat(context, mapping):
     """String. Statistics of changes with the following format:
     "modified files: +added/-removed lines"
     """
     ctx = context.resource(mapping, 'ctx')
     stats = patch.diffstatdata(util.iterlines(ctx.diff(noprefix=False)))
     maxname, maxtotal, adds, removes, binary = patch.diffstatsum(stats)
     return '%d: +%d/-%d' % (len(stats), adds, removes)
 
 @templatekeyword('envvars', requires={'ui', 'templ'})
 def showenvvars(context, mapping):
     """A dictionary of environment variables. (EXPERIMENTAL)"""
     ui = context.resource(mapping, 'ui')
     env = ui.exportableenviron()
     env = util.sortdict((k, env[k]) for k in sorted(env))
     return compatdict(context, mapping, 'envvar', env, plural='envvars')
 
-@templatekeyword('extras')
-def showextras(**args):
+@templatekeyword('extras', requires={'ctx', 'templ'})
+def showextras(context, mapping):
     """List of dicts with key, value entries of the 'extras'
     field of this changeset."""
-    args = pycompat.byteskwargs(args)
-    extras = args['ctx'].extra()
+    ctx = context.resource(mapping, 'ctx')
+    templ = context.resource(mapping, 'templ')
+    extras = ctx.extra()
     extras = util.sortdict((k, extras[k]) for k in sorted(extras))
     makemap = lambda k: {'key': k, 'value': extras[k]}
     c = [makemap(k) for k in extras]
-    f = _showlist('extra', c, args['templ'], args, plural='extras')
+    f = _showlist('extra', c, templ, mapping, plural='extras')
     return _hybrid(f, extras, makemap,
                    lambda k: '%s=%s' % (k, util.escapestr(extras[k])))
 
 def _showfilesbystat(context, mapping, name, index):
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     revcache = context.resource(mapping, 'revcache')
     if 'files' not in revcache:
         revcache['files'] = repo.status(ctx.p1(), ctx)[:3]
     files = revcache['files'][index]
     return compatlist(context, mapping, name, files, element='file')
 
 @templatekeyword('file_adds', requires={'repo', 'ctx', 'revcache', 'templ'})
 def showfileadds(context, mapping):
     """List of strings. Files added by this changeset."""
     return _showfilesbystat(context, mapping, 'file_add', 1)
 
 @templatekeyword('file_copies',
                  requires={'repo', 'ctx', 'cache', 'revcache', 'templ'})
 def showfilecopies(context, mapping):
     """List of strings. Files copied in this changeset with
     their sources.
     """
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     cache = context.resource(mapping, 'cache')
     copies = context.resource(mapping, 'revcache').get('copies')
     if copies is None:
         if 'getrenamed' not in cache:
             cache['getrenamed'] = getrenamedfn(repo)
         copies = []
         getrenamed = cache['getrenamed']
         for fn in ctx.files():
             rename = getrenamed(fn, ctx.rev())
             if rename:
                 copies.append((fn, rename[0]))
 
     copies = util.sortdict(copies)
     return compatdict(context, mapping, 'file_copy', copies,
                       key='name', value='source', fmt='%s (%s)',
                       plural='file_copies')
 
 # showfilecopiesswitch() displays file copies only if copy records are
 # provided before calling the templater, usually with a --copies
 # command line switch.
 @templatekeyword('file_copies_switch', requires={'revcache', 'templ'})
 def showfilecopiesswitch(context, mapping):
     """List of strings. Like "file_copies" but displayed
     only if the --copied switch is set.
     """
     copies = context.resource(mapping, 'revcache').get('copies') or []
     copies = util.sortdict(copies)
     return compatdict(context, mapping, 'file_copy', copies,
                       key='name', value='source', fmt='%s (%s)',
                       plural='file_copies')
 
 @templatekeyword('file_dels', requires={'repo', 'ctx', 'revcache', 'templ'})
 def showfiledels(context, mapping):
     """List of strings. Files removed by this changeset."""
     return _showfilesbystat(context, mapping, 'file_del', 2)
 
 @templatekeyword('file_mods', requires={'repo', 'ctx', 'revcache', 'templ'})
 def showfilemods(context, mapping):
     """List of strings. Files modified by this changeset."""
     return _showfilesbystat(context, mapping, 'file_mod', 0)
 
 @templatekeyword('files', requires={'ctx', 'templ'})
 def showfiles(context, mapping):
     """List of strings. All files modified, added, or removed by this
     changeset.
     """
     ctx = context.resource(mapping, 'ctx')
     return compatlist(context, mapping, 'file', ctx.files())
 
 @templatekeyword('graphnode', requires={'repo', 'ctx'})
 def showgraphnode(context, mapping):
     """String. The character representing the changeset node in an ASCII
     revision graph."""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     return getgraphnode(repo, ctx)
 
 def getgraphnode(repo, ctx):
     wpnodes = repo.dirstate.parents()
     if wpnodes[1] == nullid:
         wpnodes = wpnodes[:1]
     if ctx.node() in wpnodes:
         return '@'
     elif ctx.obsolete():
         return 'x'
     elif ctx.isunstable():
         return '*'
     elif ctx.closesbranch():
         return '_'
     else:
         return 'o'
 
 @templatekeyword('graphwidth', requires=())
 def showgraphwidth(context, mapping):
     """Integer. The width of the graph drawn by 'log --graph' or zero."""
     # just hosts documentation; should be overridden by template mapping
     return 0
 
 @templatekeyword('index', requires=())
 def showindex(context, mapping):
     """Integer. The current iteration of the loop. (0 indexed)"""
     # just hosts documentation; should be overridden by template mapping
     raise error.Abort(_("can't use index in this context"))
 
 @templatekeyword('latesttag', requires={'repo', 'ctx', 'cache', 'templ'})
 def showlatesttag(context, mapping):
     """List of strings. The global tags on the most recent globally
     tagged ancestor of this changeset.  If no such tags exist, the list
     consists of the single string "null".
     """
     return showlatesttags(context, mapping, None)
 
 def showlatesttags(context, mapping, pattern):
     """helper method for the latesttag keyword and function"""
     latesttags = getlatesttags(context, mapping, pattern)
 
     # latesttag[0] is an implementation detail for sorting csets on different
     # branches in a stable manner- it is the date the tagged cset was created,
     # not the date the tag was created.  Therefore it isn't made visible here.
     makemap = lambda v: {
         'changes': _showchangessincetag,
         'distance': latesttags[1],
         'latesttag': v,   # BC with {latesttag % '{latesttag}'}
         'tag': v
     }
 
     tags = latesttags[2]
     templ = context.resource(mapping, 'templ')
     f = _showlist('latesttag', tags, templ, mapping, separator=':')
     return _hybrid(f, tags, makemap, pycompat.identity)
 
 @templatekeyword('latesttagdistance', requires={'repo', 'ctx', 'cache'})
 def showlatesttagdistance(context, mapping):
     """Integer. Longest path to the latest tag."""
     return getlatesttags(context, mapping)[1]
 
 @templatekeyword('changessincelatesttag', requires={'repo', 'ctx', 'cache'})
 def showchangessincelatesttag(context, mapping):
     """Integer. All ancestors not in the latest tag."""
     mapping = mapping.copy()
     mapping['tag'] = getlatesttags(context, mapping)[2][0]
     return _showchangessincetag(context, mapping)
 
 def _showchangessincetag(context, mapping):
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     offset = 0
     revs = [ctx.rev()]
     tag = context.symbol(mapping, 'tag')
 
     # The only() revset doesn't currently support wdir()
     if ctx.rev() is None:
         offset = 1
         revs = [p.rev() for p in ctx.parents()]
 
     return len(repo.revs('only(%ld, %s)', revs, tag)) + offset
 
 # teach templater latesttags.changes is switched to (context, mapping) API
 _showchangessincetag._requires = {'repo', 'ctx'}
 
 @templatekeyword('manifest', requires={'repo', 'ctx', 'templ'})
 def showmanifest(context, mapping):
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     templ = context.resource(mapping, 'templ')
     mnode = ctx.manifestnode()
     if mnode is None:
         # just avoid crash, we might want to use the 'ff...' hash in future
         return
     mrev = repo.manifestlog._revlog.rev(mnode)
     mhex = hex(mnode)
     mapping = mapping.copy()
     mapping.update({'rev': mrev, 'node': mhex})
     f = templ('manifest', **pycompat.strkwargs(mapping))
     # TODO: perhaps 'ctx' should be dropped from mapping because manifest
     # rev and node are completely different from changeset's.
     return _mappable(f, None, f, lambda x: {'rev': mrev, 'node': mhex})
 
 @templatekeyword('obsfate', requires={'ui', 'repo', 'ctx', 'templ'})
 def showobsfate(context, mapping):
     # this function returns a list containing pre-formatted obsfate strings.
     #
     # This function will be replaced by templates fragments when we will have
     # the verbosity templatekw available.
     succsandmarkers = showsuccsandmarkers(context, mapping)
 
     ui = context.resource(mapping, 'ui')
     values = []
 
     for x in succsandmarkers:
         values.append(obsutil.obsfateprinter(x['successors'], x['markers'], ui))
 
     return compatlist(context, mapping, "fate", values)
 
 def shownames(context, mapping, namespace):
     """helper method to generate a template keyword for a namespace"""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     ns = repo.names[namespace]
     names = ns.names(repo, ctx.node())
     return compatlist(context, mapping, ns.templatename, names,
                       plural=namespace)
 
 @templatekeyword('namespaces', requires={'repo', 'ctx', 'templ'})
 def shownamespaces(context, mapping):
     """Dict of lists. Names attached to this changeset per
     namespace."""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     templ = context.resource(mapping, 'templ')
 
     namespaces = util.sortdict()
     def makensmapfn(ns):
         # 'name' for iterating over namespaces, templatename for local reference
         return lambda v: {'name': v, ns.templatename: v}
 
     for k, ns in repo.names.iteritems():
         names = ns.names(repo, ctx.node())
         f = _showlist('name', names, templ, mapping)
         namespaces[k] = _hybrid(f, names, makensmapfn(ns), pycompat.identity)
 
     f = _showlist('namespace', list(namespaces), templ, mapping)
 
     def makemap(ns):
         return {
             'namespace': ns,
             'names': namespaces[ns],
             'builtin': repo.names[ns].builtin,
             'colorname': repo.names[ns].colorname,
         }
 
     return _hybrid(f, namespaces, makemap, pycompat.identity)
 
 @templatekeyword('node', requires={'ctx'})
 def shownode(context, mapping):
     """String. The changeset identification hash, as a 40 hexadecimal
     digit string.
     """
     ctx = context.resource(mapping, 'ctx')
     return ctx.hex()
 
 @templatekeyword('obsolete', requires={'ctx'})
 def showobsolete(context, mapping):
     """String. Whether the changeset is obsolete. (EXPERIMENTAL)"""
     ctx = context.resource(mapping, 'ctx')
     if ctx.obsolete():
         return 'obsolete'
     return ''
 
 @templatekeyword('peerurls', requires={'repo'})
 def showpeerurls(context, mapping):
     """A dictionary of repository locations defined in the [paths] section
     of your configuration file."""
     repo = context.resource(mapping, 'repo')
     # see commands.paths() for naming of dictionary keys
     paths = repo.ui.paths
     urls = util.sortdict((k, p.rawloc) for k, p in sorted(paths.iteritems()))
     def makemap(k):
         p = paths[k]
         d = {'name': k, 'url': p.rawloc}
         d.update((o, v) for o, v in sorted(p.suboptions.iteritems()))
         return d
     return _hybrid(None, urls, makemap, lambda k: '%s=%s' % (k, urls[k]))
 
 @templatekeyword("predecessors", requires={'repo', 'ctx'})
 def showpredecessors(context, mapping):
     """Returns the list if the closest visible successors. (EXPERIMENTAL)"""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     predecessors = sorted(obsutil.closestpredecessors(repo, ctx.node()))
     predecessors = map(hex, predecessors)
 
     return _hybrid(None, predecessors,
                    lambda x: {'ctx': repo[x], 'revcache': {}},
                    lambda x: scmutil.formatchangeid(repo[x]))
 
 @templatekeyword('reporoot', requires={'repo'})
 def showreporoot(context, mapping):
     """String. The root directory of the current repository."""
     repo = context.resource(mapping, 'repo')
     return repo.root
 
 @templatekeyword("successorssets", requires={'repo', 'ctx'})
 def showsuccessorssets(context, mapping):
     """Returns a string of sets of successors for a changectx. Format used
     is: [ctx1, ctx2], [ctx3] if ctx has been splitted into ctx1 and ctx2
     while also diverged into ctx3. (EXPERIMENTAL)"""
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     if not ctx.obsolete():
         return ''
 
     ssets = obsutil.successorssets(repo, ctx.node(), closest=True)
     ssets = [[hex(n) for n in ss] for ss in ssets]
 
     data = []
     for ss in ssets:
         h = _hybrid(None, ss, lambda x: {'ctx': repo[x], 'revcache': {}},
                     lambda x: scmutil.formatchangeid(repo[x]))
         data.append(h)
 
     # Format the successorssets
     def render(d):
         t = []
         for i in d.gen():
             t.append(i)
         return "".join(t)
 
     def gen(data):
         yield "; ".join(render(d) for d in data)
 
     return _hybrid(gen(data), data, lambda x: {'successorset': x},
                    pycompat.identity)
 
 @templatekeyword("succsandmarkers", requires={'repo', 'ctx', 'templ'})
 def showsuccsandmarkers(context, mapping):
     """Returns a list of dict for each final successor of ctx. The dict
     contains successors node id in "successors" keys and the list of
     obs-markers from ctx to the set of successors in "markers".
     (EXPERIMENTAL)
     """
     repo = context.resource(mapping, 'repo')
     ctx = context.resource(mapping, 'ctx')
     templ = context.resource(mapping, 'templ')
 
     values = obsutil.successorsandmarkers(repo, ctx)
 
     if values is None:
         values = []
 
     # Format successors and markers to avoid exposing binary to templates
     data = []
     for i in values:
         # Format successors
         successors = i['successors']
 
         successors = [hex(n) for n in successors]
         successors = _hybrid(None, successors,
                              lambda x: {'ctx': repo[x], 'revcache': {}},
                              lambda x: scmutil.formatchangeid(repo[x]))
 
         # Format markers
         finalmarkers = []
         for m in i['markers']:
             hexprec = hex(m[0])
             hexsucs = tuple(hex(n) for n in m[1])
             hexparents = None
             if m[5] is not None:
                 hexparents = tuple(hex(n) for n in m[5])
             newmarker = (hexprec, hexsucs) + m[2:5] + (hexparents,) + m[6:]
             finalmarkers.append(newmarker)
 
         data.append({'successors': successors, 'markers': finalmarkers})
 
     f = _showlist('succsandmarkers', data, templ, mapping)
     return _hybrid(f, data, lambda x: x, pycompat.identity)
 
 @templatekeyword('p1rev', requires={'ctx'})
 def showp1rev(context, mapping):
     """Integer. The repository-local revision number of the changeset's
     first parent, or -1 if the changeset has no parents."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.p1().rev()
 
 @templatekeyword('p2rev', requires={'ctx'})
 def showp2rev(context, mapping):
     """Integer. The repository-local revision number of the changeset's
     second parent, or -1 if the changeset has no second parent."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.p2().rev()
 
 @templatekeyword('p1node', requires={'ctx'})
 def showp1node(context, mapping):
     """String. The identification hash of the changeset's first parent,
     as a 40 digit hexadecimal string. If the changeset has no parents, all
     digits are 0."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.p1().hex()
 
 @templatekeyword('p2node', requires={'ctx'})
 def showp2node(context, mapping):
     """String. The identification hash of the changeset's second
     parent, as a 40 digit hexadecimal string. If the changeset has no second
     parent, all digits are 0."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.p2().hex()
 
-@templatekeyword('parents')
-def showparents(**args):
+@templatekeyword('parents', requires={'repo', 'ctx', 'templ'})
+def showparents(context, mapping):
     """List of strings. The parents of the changeset in "rev:node"
     format. If the changeset has only one "natural" parent (the predecessor
     revision) nothing is shown."""
-    args = pycompat.byteskwargs(args)
-    repo = args['repo']
-    ctx = args['ctx']
+    repo = context.resource(mapping, 'repo')
+    ctx = context.resource(mapping, 'ctx')
+    templ = context.resource(mapping, 'templ')
     pctxs = scmutil.meaningfulparents(repo, ctx)
     prevs = [p.rev() for p in pctxs]
     parents = [[('rev', p.rev()),
                 ('node', p.hex()),
                 ('phase', p.phasestr())]
                for p in pctxs]
-    f = _showlist('parent', parents, args['templ'], args)
+    f = _showlist('parent', parents, templ, mapping)
     return _hybrid(f, prevs, lambda x: {'ctx': repo[x], 'revcache': {}},
                    lambda x: scmutil.formatchangeid(repo[x]), keytype=int)
 
 @templatekeyword('phase', requires={'ctx'})
 def showphase(context, mapping):
     """String. The changeset phase name."""
     ctx = context.resource(mapping, 'ctx')
     return ctx.phasestr()
 
 @templatekeyword('phaseidx', requires={'ctx'})
 def showphaseidx(context, mapping):
     """Integer. The changeset phase index. (ADVANCED)"""
     ctx = context.resource(mapping, 'ctx')
     return ctx.phase()
 
 @templatekeyword('rev', requires={'ctx'})
 def showrev(context, mapping):
     """Integer. The repository-local changeset revision number."""
     ctx = context.resource(mapping, 'ctx')
     return scmutil.intrev(ctx)
 
 def showrevslist(context, mapping, name, revs):
     """helper to generate a list of revisions in which a mapped template will
     be evaluated"""
     repo = context.resource(mapping, 'repo')
     templ = context.resource(mapping, 'templ')
     f = _showlist(name, ['%d' % r for r in revs], templ, mapping)
     return _hybrid(f, revs,
                    lambda x: {name: x, 'ctx': repo[x], 'revcache': {}},
                    pycompat.identity, keytype=int)
 
 @templatekeyword('subrepos', requires={'ctx', 'templ'})
 def showsubrepos(context, mapping):
     """List of strings. Updated subrepositories in the changeset."""
     ctx = context.resource(mapping, 'ctx')
     substate = ctx.substate
     if not substate:
         return compatlist(context, mapping, 'subrepo', [])
     psubstate = ctx.parents()[0].substate or {}
     subrepos = []
     for sub in substate:
         if sub not in psubstate or substate[sub] != psubstate[sub]:
             subrepos.append(sub) # modified or newly added in ctx
     for sub in psubstate:
         if sub not in substate:
             subrepos.append(sub) # removed in ctx
     return compatlist(context, mapping, 'subrepo', sorted(subrepos))
 
 # don't remove "showtags" definition, even though namespaces will put
 # a helper function for "tags" keyword into "keywords" map automatically,
 # because online help text is built without namespaces initialization
 @templatekeyword('tags', requires={'repo', 'ctx', 'templ'})
 def showtags(context, mapping):
     """List of strings. Any tags associated with the changeset."""
     return shownames(context, mapping, 'tags')
 
 @templatekeyword('termwidth', requires={'ui'})
 def showtermwidth(context, mapping):
     """Integer. The width of the current terminal."""
     ui = context.resource(mapping, 'ui')
     return ui.termwidth()
 
 @templatekeyword('instabilities', requires={'ctx', 'templ'})
 def showinstabilities(context, mapping):
     """List of strings. Evolution instabilities affecting the changeset.
     (EXPERIMENTAL)
     """
     ctx = context.resource(mapping, 'ctx')
     return compatlist(context, mapping, 'instability', ctx.instabilities(),
                       plural='instabilities')
 
 @templatekeyword('verbosity', requires={'ui'})
 def showverbosity(context, mapping):
     """String. The current output verbosity in 'debug', 'quiet', 'verbose',
     or ''."""
     ui = context.resource(mapping, 'ui')
     # see logcmdutil.changesettemplater for priority of these flags
     if ui.debugflag:
         return 'debug'
     elif ui.quiet:
         return 'quiet'
     elif ui.verbose:
         return 'verbose'
     return ''
 
 def loadkeyword(ui, extname, registrarobj):
     """Load template keyword from specified registrarobj
     """
     for name, func in registrarobj._table.iteritems():
         keywords[name] = func
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = keywords.values()