templater: convert resources to a table of callables for future extension

I'm going to add a full templating support to the annotate command. As the
annotate is a filectx-oriented command, we'll  need a way to look up a ctx
from a bounded fctx only when necessary.

This is the minimal change to support that. I'm thinking of defining a proper
interface to look up template resources to fix other issues, but that isn't
ready yet.

(Changes from V1: just updated tests and patch descriptions.)

mercurial/formatter.py

@@ -1,554 +1,563
 # formatter.py - generic output formatting for mercurial
 #
 # Copyright 2012 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.
 
 """Generic output formatting for Mercurial
 
 The formatter provides API to show data in various ways. The following
 functions should be used in place of ui.write():
 
 - fm.write() for unconditional output
 - fm.condwrite() to show some extra data conditionally in plain output
 - fm.context() to provide changectx to template output
 - fm.data() to provide extra data to JSON or template output
 - fm.plain() to show raw text that isn't provided to JSON or template output
 
 To show structured data (e.g. date tuples, dicts, lists), apply fm.format*()
 beforehand so the data is converted to the appropriate data type. Use
 fm.isplain() if you need to convert or format data conditionally which isn't
 supported by the formatter API.
 
 To build nested structure (i.e. a list of dicts), use fm.nested().
 
 See also https://www.mercurial-scm.org/wiki/GenericTemplatingPlan
 
 fm.condwrite() vs 'if cond:':
 
 In most cases, use fm.condwrite() so users can selectively show the data
 in template output. If it's costly to build data, use plain 'if cond:' with
 fm.write().
 
 fm.nested() vs fm.formatdict() (or fm.formatlist()):
 
 fm.nested() should be used to form a tree structure (a list of dicts of
 lists of dicts...) which can be accessed through template keywords, e.g.
 "{foo % "{bar % {...}} {baz % {...}}"}". On the other hand, fm.formatdict()
 exports a dict-type object to template, which can be accessed by e.g.
 "{get(foo, key)}" function.
 
 Doctest helper:
 
 >>> def show(fn, verbose=False, **opts):
 ...     import sys
 ...     from . import ui as uimod
 ...     ui = uimod.ui()
 ...     ui.verbose = verbose
 ...     ui.pushbuffer()
 ...     try:
 ...         return fn(ui, ui.formatter(pycompat.sysbytes(fn.__name__),
 ...                   pycompat.byteskwargs(opts)))
 ...     finally:
 ...         print(pycompat.sysstr(ui.popbuffer()), end='')
 
 Basic example:
 
 >>> def files(ui, fm):
 ...     files = [(b'foo', 123, (0, 0)), (b'bar', 456, (1, 0))]
 ...     for f in files:
 ...         fm.startitem()
 ...         fm.write(b'path', b'%s', f[0])
 ...         fm.condwrite(ui.verbose, b'date', b'  %s',
 ...                      fm.formatdate(f[2], b'%Y-%m-%d %H:%M:%S'))
 ...         fm.data(size=f[1])
 ...         fm.plain(b'\\n')
 ...     fm.end()
 >>> show(files)
 foo
 bar
 >>> show(files, verbose=True)
 foo  1970-01-01 00:00:00
 bar  1970-01-01 00:00:01
 >>> show(files, template=b'json')
 [
  {
   "date": [0, 0],
   "path": "foo",
   "size": 123
  },
  {
   "date": [1, 0],
   "path": "bar",
   "size": 456
  }
 ]
 >>> show(files, template=b'path: {path}\\ndate: {date|rfc3339date}\\n')
 path: foo
 date: 1970-01-01T00:00:00+00:00
 path: bar
 date: 1970-01-01T00:00:01+00:00
 
 Nested example:
 
 >>> def subrepos(ui, fm):
 ...     fm.startitem()
 ...     fm.write(b'reponame', b'[%s]\\n', b'baz')
 ...     files(ui, fm.nested(b'files'))
 ...     fm.end()
 >>> show(subrepos)
 [baz]
 foo
 bar
 >>> show(subrepos, template=b'{reponame}: {join(files % "{path}", ", ")}\\n')
 baz: foo, bar
 """
 
 from __future__ import absolute_import, print_function
 
 import collections
 import contextlib
 import itertools
 import os
 
 from .i18n import _
 from .node import (
     hex,
     short,
 )
 
 from . import (
     error,
     pycompat,
     templatefilters,
     templatekw,
     templater,
     templateutil,
     util,
 )
 from .utils import dateutil
 
 pickle = util.pickle
 
 class _nullconverter(object):
     '''convert non-primitive data types to be processed by formatter'''
 
     # set to True if context object should be stored as item
     storecontext = False
 
     @staticmethod
     def formatdate(date, fmt):
         '''convert date tuple to appropriate format'''
         return date
     @staticmethod
     def formatdict(data, key, value, fmt, sep):
         '''convert dict or key-value pairs to appropriate dict format'''
         # use plain dict instead of util.sortdict so that data can be
         # serialized as a builtin dict in pickle output
         return dict(data)
     @staticmethod
     def formatlist(data, name, fmt, sep):
         '''convert iterable to appropriate list format'''
         return list(data)
 
 class baseformatter(object):
     def __init__(self, ui, topic, opts, converter):
         self._ui = ui
         self._topic = topic
         self._style = opts.get("style")
         self._template = opts.get("template")
         self._converter = converter
         self._item = None
         # function to convert node to string suitable for this output
         self.hexfunc = hex
     def __enter__(self):
         return self
     def __exit__(self, exctype, excvalue, traceback):
         if exctype is None:
             self.end()
     def _showitem(self):
         '''show a formatted item once all data is collected'''
     def startitem(self):
         '''begin an item in the format list'''
         if self._item is not None:
             self._showitem()
         self._item = {}
     def formatdate(self, date, fmt='%a %b %d %H:%M:%S %Y %1%2'):
         '''convert date tuple to appropriate format'''
         return self._converter.formatdate(date, fmt)
     def formatdict(self, data, key='key', value='value', fmt=None, sep=' '):
         '''convert dict or key-value pairs to appropriate dict format'''
         return self._converter.formatdict(data, key, value, fmt, sep)
     def formatlist(self, data, name, fmt=None, sep=' '):
         '''convert iterable to appropriate list format'''
         # name is mandatory argument for now, but it could be optional if
         # we have default template keyword, e.g. {item}
         return self._converter.formatlist(data, name, fmt, sep)
     def context(self, **ctxs):
         '''insert context objects to be used to render template keywords'''
         ctxs = pycompat.byteskwargs(ctxs)
         assert all(k == 'ctx' for k in ctxs)
         if self._converter.storecontext:
             self._item.update(ctxs)
     def data(self, **data):
         '''insert data into item that's not shown in default output'''
         data = pycompat.byteskwargs(data)
         self._item.update(data)
     def write(self, fields, deftext, *fielddata, **opts):
         '''do default text output while assigning data to item'''
         fieldkeys = fields.split()
         assert len(fieldkeys) == len(fielddata)
         self._item.update(zip(fieldkeys, fielddata))
     def condwrite(self, cond, fields, deftext, *fielddata, **opts):
         '''do conditional write (primarily for plain formatter)'''
         fieldkeys = fields.split()
         assert len(fieldkeys) == len(fielddata)
         self._item.update(zip(fieldkeys, fielddata))
     def plain(self, text, **opts):
         '''show raw text for non-templated mode'''
     def isplain(self):
         '''check for plain formatter usage'''
         return False
     def nested(self, field):
         '''sub formatter to store nested data in the specified field'''
         self._item[field] = data = []
         return _nestedformatter(self._ui, self._converter, data)
     def end(self):
         '''end output for the formatter'''
         if self._item is not None:
             self._showitem()
 
 def nullformatter(ui, topic):
     '''formatter that prints nothing'''
     return baseformatter(ui, topic, opts={}, converter=_nullconverter)
 
 class _nestedformatter(baseformatter):
     '''build sub items and store them in the parent formatter'''
     def __init__(self, ui, converter, data):
         baseformatter.__init__(self, ui, topic='', opts={}, converter=converter)
         self._data = data
     def _showitem(self):
         self._data.append(self._item)
 
 def _iteritems(data):
     '''iterate key-value pairs in stable order'''
     if isinstance(data, dict):
         return sorted(data.iteritems())
     return data
 
 class _plainconverter(object):
     '''convert non-primitive data types to text'''
 
     storecontext = False
 
     @staticmethod
     def formatdate(date, fmt):
         '''stringify date tuple in the given format'''
         return dateutil.datestr(date, fmt)
     @staticmethod
     def formatdict(data, key, value, fmt, sep):
         '''stringify key-value pairs separated by sep'''
         prefmt = pycompat.identity
         if fmt is None:
             fmt = '%s=%s'
             prefmt = pycompat.bytestr
         return sep.join(fmt % (prefmt(k), prefmt(v))
                         for k, v in _iteritems(data))
     @staticmethod
     def formatlist(data, name, fmt, sep):
         '''stringify iterable separated by sep'''
         prefmt = pycompat.identity
         if fmt is None:
             fmt = '%s'
             prefmt = pycompat.bytestr
         return sep.join(fmt % prefmt(e) for e in data)
 
 class plainformatter(baseformatter):
     '''the default text output scheme'''
     def __init__(self, ui, out, topic, opts):
         baseformatter.__init__(self, ui, topic, opts, _plainconverter)
         if ui.debugflag:
             self.hexfunc = hex
         else:
             self.hexfunc = short
         if ui is out:
             self._write = ui.write
         else:
             self._write = lambda s, **opts: out.write(s)
     def startitem(self):
         pass
     def data(self, **data):
         pass
     def write(self, fields, deftext, *fielddata, **opts):
         self._write(deftext % fielddata, **opts)
     def condwrite(self, cond, fields, deftext, *fielddata, **opts):
         '''do conditional write'''
         if cond:
             self._write(deftext % fielddata, **opts)
     def plain(self, text, **opts):
         self._write(text, **opts)
     def isplain(self):
         return True
     def nested(self, field):
         # nested data will be directly written to ui
         return self
     def end(self):
         pass
 
 class debugformatter(baseformatter):
     def __init__(self, ui, out, topic, opts):
         baseformatter.__init__(self, ui, topic, opts, _nullconverter)
         self._out = out
         self._out.write("%s = [\n" % self._topic)
     def _showitem(self):
         self._out.write('    %s,\n' % pycompat.byterepr(self._item))
     def end(self):
         baseformatter.end(self)
         self._out.write("]\n")
 
 class pickleformatter(baseformatter):
     def __init__(self, ui, out, topic, opts):
         baseformatter.__init__(self, ui, topic, opts, _nullconverter)
         self._out = out
         self._data = []
     def _showitem(self):
         self._data.append(self._item)
     def end(self):
         baseformatter.end(self)
         self._out.write(pickle.dumps(self._data))
 
 class jsonformatter(baseformatter):
     def __init__(self, ui, out, topic, opts):
         baseformatter.__init__(self, ui, topic, opts, _nullconverter)
         self._out = out
         self._out.write("[")
         self._first = True
     def _showitem(self):
         if self._first:
             self._first = False
         else:
             self._out.write(",")
 
         self._out.write("\n {\n")
         first = True
         for k, v in sorted(self._item.items()):
             if first:
                 first = False
             else:
                 self._out.write(",\n")
             u = templatefilters.json(v, paranoid=False)
             self._out.write('  "%s": %s' % (k, u))
         self._out.write("\n }")
     def end(self):
         baseformatter.end(self)
         self._out.write("\n]\n")
 
 class _templateconverter(object):
     '''convert non-primitive data types to be processed by templater'''
 
     storecontext = True
 
     @staticmethod
     def formatdate(date, fmt):
         '''return date tuple'''
         return date
     @staticmethod
     def formatdict(data, key, value, fmt, sep):
         '''build object that can be evaluated as either plain string or dict'''
         data = util.sortdict(_iteritems(data))
         def f():
             yield _plainconverter.formatdict(data, key, value, fmt, sep)
         return templateutil.hybriddict(data, key=key, value=value, fmt=fmt,
                                        gen=f)
     @staticmethod
     def formatlist(data, name, fmt, sep):
         '''build object that can be evaluated as either plain string or list'''
         data = list(data)
         def f():
             yield _plainconverter.formatlist(data, name, fmt, sep)
         return templateutil.hybridlist(data, name=name, fmt=fmt, gen=f)
 
 class templateformatter(baseformatter):
     def __init__(self, ui, out, topic, opts):
         baseformatter.__init__(self, ui, topic, opts, _templateconverter)
         self._out = out
         spec = lookuptemplate(ui, topic, opts.get('template', ''))
         self._tref = spec.ref
         self._t = loadtemplater(ui, spec, defaults=templatekw.keywords,
                                 resources=templateresources(ui),
                                 cache=templatekw.defaulttempl)
         self._parts = templatepartsmap(spec, self._t,
                                        ['docheader', 'docfooter', 'separator'])
         self._counter = itertools.count()
         self._renderitem('docheader', {})
 
     def _showitem(self):
         item = self._item.copy()
         item['index'] = index = next(self._counter)
         if index > 0:
             self._renderitem('separator', {})
         self._renderitem(self._tref, item)
 
     def _renderitem(self, part, item):
         if part not in self._parts:
             return
         ref = self._parts[part]
 
         # TODO: add support for filectx
         props = {}
         # explicitly-defined fields precede templatekw
         props.update(item)
         if 'ctx' in item:
             # but template resources must be always available
             props['repo'] = props['ctx'].repo()
             props['revcache'] = {}
         props = pycompat.strkwargs(props)
         g = self._t(ref, **props)
         self._out.write(templateutil.stringify(g))
 
     def end(self):
         baseformatter.end(self)
         self._renderitem('docfooter', {})
 
 templatespec = collections.namedtuple(r'templatespec',
                                       r'ref tmpl mapfile')
 
 def lookuptemplate(ui, topic, tmpl):
     """Find the template matching the given -T/--template spec 'tmpl'
 
     'tmpl' can be any of the following:
 
      - a literal template (e.g. '{rev}')
      - a map-file name or path (e.g. 'changelog')
      - a reference to [templates] in config file
      - a path to raw template file
 
     A map file defines a stand-alone template environment. If a map file
     selected, all templates defined in the file will be loaded, and the
     template matching the given topic will be rendered. Aliases won't be
     loaded from user config, but from the map file.
 
     If no map file selected, all templates in [templates] section will be
     available as well as aliases in [templatealias].
     """
 
     # looks like a literal template?
     if '{' in tmpl:
         return templatespec('', tmpl, None)
 
     # perhaps a stock style?
     if not os.path.split(tmpl)[0]:
         mapname = (templater.templatepath('map-cmdline.' + tmpl)
                    or templater.templatepath(tmpl))
         if mapname and os.path.isfile(mapname):
             return templatespec(topic, None, mapname)
 
     # perhaps it's a reference to [templates]
     if ui.config('templates', tmpl):
         return templatespec(tmpl, None, None)
 
     if tmpl == 'list':
         ui.write(_("available styles: %s\n") % templater.stylelist())
         raise error.Abort(_("specify a template"))
 
     # perhaps it's a path to a map or a template
     if ('/' in tmpl or '\\' in tmpl) and os.path.isfile(tmpl):
         # is it a mapfile for a style?
         if os.path.basename(tmpl).startswith("map-"):
             return templatespec(topic, None, os.path.realpath(tmpl))
         with util.posixfile(tmpl, 'rb') as f:
             tmpl = f.read()
         return templatespec('', tmpl, None)
 
     # constant string?
     return templatespec('', tmpl, None)
 
 def templatepartsmap(spec, t, partnames):
     """Create a mapping of {part: ref}"""
     partsmap = {spec.ref: spec.ref}  # initial ref must exist in t
     if spec.mapfile:
         partsmap.update((p, p) for p in partnames if p in t)
     elif spec.ref:
         for part in partnames:
             ref = '%s:%s' % (spec.ref, part)  # select config sub-section
             if ref in t:
                 partsmap[part] = ref
     return partsmap
 
 def loadtemplater(ui, spec, defaults=None, resources=None, cache=None):
     """Create a templater from either a literal template or loading from
     a map file"""
     assert not (spec.tmpl and spec.mapfile)
     if spec.mapfile:
         frommapfile = templater.templater.frommapfile
         return frommapfile(spec.mapfile, defaults=defaults, resources=resources,
                            cache=cache)
     return maketemplater(ui, spec.tmpl, defaults=defaults, resources=resources,
                          cache=cache)
 
 def maketemplater(ui, tmpl, defaults=None, resources=None, cache=None):
     """Create a templater from a string template 'tmpl'"""
     aliases = ui.configitems('templatealias')
     t = templater.templater(defaults=defaults, resources=resources,
                             cache=cache, aliases=aliases)
     t.cache.update((k, templater.unquotestring(v))
                    for k, v in ui.configitems('templates'))
     if tmpl:
         t.cache[''] = tmpl
     return t
 
 def templateresources(ui, repo=None):
     """Create a dict of template resources designed for the default templatekw
     and function"""
-    return {
+    resmap = {
         'cache': {},  # for templatekw/funcs to store reusable data
-        'ctx': None,
         'repo': repo,
-        'revcache': None,  # per-ctx cache; set later
         'ui': ui,
     }
 
+    def getsome(context, mapping, key):
+        return resmap.get(key)
+
+    return {
+        'cache': getsome,
+        'ctx': getsome,
+        'repo': getsome,
+        'revcache': getsome,  # per-ctx cache; set later
+        'ui': getsome,
+    }
+
 def formatter(ui, out, topic, opts):
     template = opts.get("template", "")
     if template == "json":
         return jsonformatter(ui, out, topic, opts)
     elif template == "pickle":
         return pickleformatter(ui, out, topic, opts)
     elif template == "debug":
         return debugformatter(ui, out, topic, opts)
     elif template != "":
         return templateformatter(ui, out, topic, opts)
     # developer config: ui.formatdebug
     elif ui.configbool('ui', 'formatdebug'):
         return debugformatter(ui, out, topic, opts)
     # deprecated config: ui.formatjson
     elif ui.configbool('ui', 'formatjson'):
         return jsonformatter(ui, out, topic, opts)
     return plainformatter(ui, out, topic, opts)
 
 @contextlib.contextmanager
 def openformatter(ui, filename, topic, opts):
     """Create a formatter that writes outputs to the specified file
 
     Must be invoked using the 'with' statement.
     """
     with util.posixfile(filename, 'wb') as out:
         with formatter(ui, out, topic, opts) as fm:
             yield fm
 
 @contextlib.contextmanager
 def _neverending(fm):
     yield fm
 
 def maybereopen(fm, filename, opts):
     """Create a formatter backed by file if filename specified, else return
     the given formatter
 
     Must be invoked using the 'with' statement. This will never call fm.end()
     of the given formatter.
     """
     if filename:
         return openformatter(fm._ui, filename, fm._topic, opts)
     else:
         return _neverending(fm)

mercurial/logcmdutil.py

@@ -1,941 +1,942
 # logcmdutil.py - utility for log-like commands
 #
 # 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 itertools
 import os
 
 from .i18n import _
 from .node import (
     hex,
     nullid,
 )
 
 from . import (
     dagop,
     encoding,
     error,
     formatter,
     graphmod,
     match as matchmod,
     mdiff,
     patch,
     pathutil,
     pycompat,
     revset,
     revsetlang,
     scmutil,
     smartset,
     templatekw,
     templater,
     templateutil,
     util,
 )
 from .utils import dateutil
 
 def getlimit(opts):
     """get the log limit according to option -l/--limit"""
     limit = opts.get('limit')
     if limit:
         try:
             limit = int(limit)
         except ValueError:
             raise error.Abort(_('limit must be a positive integer'))
         if limit <= 0:
             raise error.Abort(_('limit must be positive'))
     else:
         limit = None
     return limit
 
 def diffordiffstat(ui, repo, diffopts, node1, node2, match,
                    changes=None, stat=False, fp=None, prefix='',
                    root='', listsubrepos=False, hunksfilterfn=None):
     '''show diff or diffstat.'''
     if root:
         relroot = pathutil.canonpath(repo.root, repo.getcwd(), root)
     else:
         relroot = ''
     if relroot != '':
         # XXX relative roots currently don't work if the root is within a
         # subrepo
         uirelroot = match.uipath(relroot)
         relroot += '/'
         for matchroot in match.files():
             if not matchroot.startswith(relroot):
                 ui.warn(_('warning: %s not inside relative root %s\n') % (
                     match.uipath(matchroot), uirelroot))
 
     if stat:
         diffopts = diffopts.copy(context=0, noprefix=False)
         width = 80
         if not ui.plain():
             width = ui.termwidth()
 
     chunks = patch.diff(repo, node1, node2, match, changes, opts=diffopts,
                         prefix=prefix, relroot=relroot,
                         hunksfilterfn=hunksfilterfn)
 
     if fp is not None or ui.canwritewithoutlabels():
         out = fp or ui
         if stat:
             chunks = [patch.diffstat(util.iterlines(chunks), width=width)]
         for chunk in util.filechunkiter(util.chunkbuffer(chunks)):
             out.write(chunk)
     else:
         if stat:
             chunks = patch.diffstatui(util.iterlines(chunks), width=width)
         else:
             chunks = patch.difflabel(lambda chunks, **kwargs: chunks, chunks,
                                      opts=diffopts)
         if ui.canbatchlabeledwrites():
             def gen():
                 for chunk, label in chunks:
                     yield ui.label(chunk, label=label)
             for chunk in util.filechunkiter(util.chunkbuffer(gen())):
                 ui.write(chunk)
         else:
             for chunk, label in chunks:
                 ui.write(chunk, label=label)
 
     if listsubrepos:
         ctx1 = repo[node1]
         ctx2 = repo[node2]
         for subpath, sub in scmutil.itersubrepos(ctx1, ctx2):
             tempnode2 = node2
             try:
                 if node2 is not None:
                     tempnode2 = ctx2.substate[subpath][1]
             except KeyError:
                 # A subrepo that existed in node1 was deleted between node1 and
                 # node2 (inclusive). Thus, ctx2's substate won't contain that
                 # subpath. The best we can do is to ignore it.
                 tempnode2 = None
             submatch = matchmod.subdirmatcher(subpath, match)
             sub.diff(ui, diffopts, tempnode2, submatch, changes=changes,
                      stat=stat, fp=fp, prefix=prefix)
 
 class changesetdiffer(object):
     """Generate diff of changeset with pre-configured filtering functions"""
 
     def _makefilematcher(self, ctx):
         return scmutil.matchall(ctx.repo())
 
     def _makehunksfilter(self, ctx):
         return None
 
     def showdiff(self, ui, ctx, diffopts, stat=False):
         repo = ctx.repo()
         node = ctx.node()
         prev = ctx.p1().node()
         diffordiffstat(ui, repo, diffopts, prev, node,
                        match=self._makefilematcher(ctx), stat=stat,
                        hunksfilterfn=self._makehunksfilter(ctx))
 
 def changesetlabels(ctx):
     labels = ['log.changeset', 'changeset.%s' % ctx.phasestr()]
     if ctx.obsolete():
         labels.append('changeset.obsolete')
     if ctx.isunstable():
         labels.append('changeset.unstable')
         for instability in ctx.instabilities():
             labels.append('instability.%s' % instability)
     return ' '.join(labels)
 
 class changesetprinter(object):
     '''show changeset information when templating not requested.'''
 
     def __init__(self, ui, repo, differ=None, diffopts=None, buffered=False):
         self.ui = ui
         self.repo = repo
         self.buffered = buffered
         self._differ = differ or changesetdiffer()
         self.diffopts = diffopts or {}
         self.header = {}
         self.hunk = {}
         self.lastheader = None
         self.footer = None
         self._columns = templatekw.getlogcolumns()
 
     def flush(self, ctx):
         rev = ctx.rev()
         if rev in self.header:
             h = self.header[rev]
             if h != self.lastheader:
                 self.lastheader = h
                 self.ui.write(h)
             del self.header[rev]
         if rev in self.hunk:
             self.ui.write(self.hunk[rev])
             del self.hunk[rev]
 
     def close(self):
         if self.footer:
             self.ui.write(self.footer)
 
     def show(self, ctx, copies=None, **props):
         props = pycompat.byteskwargs(props)
         if self.buffered:
             self.ui.pushbuffer(labeled=True)
             self._show(ctx, copies, props)
             self.hunk[ctx.rev()] = self.ui.popbuffer()
         else:
             self._show(ctx, copies, props)
 
     def _show(self, ctx, copies, props):
         '''show a single changeset or file revision'''
         changenode = ctx.node()
         rev = ctx.rev()
 
         if self.ui.quiet:
             self.ui.write("%s\n" % scmutil.formatchangeid(ctx),
                           label='log.node')
             return
 
         columns = self._columns
         self.ui.write(columns['changeset'] % scmutil.formatchangeid(ctx),
                       label=changesetlabels(ctx))
 
         # branches are shown first before any other names due to backwards
         # compatibility
         branch = ctx.branch()
         # don't show the default branch name
         if branch != 'default':
             self.ui.write(columns['branch'] % branch, label='log.branch')
 
         for nsname, ns in self.repo.names.iteritems():
             # branches has special logic already handled above, so here we just
             # skip it
             if nsname == 'branches':
                 continue
             # we will use the templatename as the color name since those two
             # should be the same
             for name in ns.names(self.repo, changenode):
                 self.ui.write(ns.logfmt % name,
                               label='log.%s' % ns.colorname)
         if self.ui.debugflag:
             self.ui.write(columns['phase'] % ctx.phasestr(), label='log.phase')
         for pctx in scmutil.meaningfulparents(self.repo, ctx):
             label = 'log.parent changeset.%s' % pctx.phasestr()
             self.ui.write(columns['parent'] % scmutil.formatchangeid(pctx),
                           label=label)
 
         if self.ui.debugflag and rev is not None:
             mnode = ctx.manifestnode()
             mrev = self.repo.manifestlog._revlog.rev(mnode)
             self.ui.write(columns['manifest']
                           % scmutil.formatrevnode(self.ui, mrev, mnode),
                           label='ui.debug log.manifest')
         self.ui.write(columns['user'] % ctx.user(), label='log.user')
         self.ui.write(columns['date'] % dateutil.datestr(ctx.date()),
                       label='log.date')
 
         if ctx.isunstable():
             instabilities = ctx.instabilities()
             self.ui.write(columns['instability'] % ', '.join(instabilities),
                           label='log.instability')
 
         elif ctx.obsolete():
             self._showobsfate(ctx)
 
         self._exthook(ctx)
 
         if self.ui.debugflag:
             files = ctx.p1().status(ctx)[:3]
             for key, value in zip(['files', 'files+', 'files-'], files):
                 if value:
                     self.ui.write(columns[key] % " ".join(value),
                                   label='ui.debug log.files')
         elif ctx.files() and self.ui.verbose:
             self.ui.write(columns['files'] % " ".join(ctx.files()),
                           label='ui.note log.files')
         if copies and self.ui.verbose:
             copies = ['%s (%s)' % c for c in copies]
             self.ui.write(columns['copies'] % ' '.join(copies),
                           label='ui.note log.copies')
 
         extra = ctx.extra()
         if extra and self.ui.debugflag:
             for key, value in sorted(extra.items()):
                 self.ui.write(columns['extra'] % (key, util.escapestr(value)),
                               label='ui.debug log.extra')
 
         description = ctx.description().strip()
         if description:
             if self.ui.verbose:
                 self.ui.write(_("description:\n"),
                               label='ui.note log.description')
                 self.ui.write(description,
                               label='ui.note log.description')
                 self.ui.write("\n\n")
             else:
                 self.ui.write(columns['summary'] % description.splitlines()[0],
                               label='log.summary')
         self.ui.write("\n")
 
         self._showpatch(ctx)
 
     def _showobsfate(self, ctx):
         # TODO: do not depend on templater
         tres = formatter.templateresources(self.repo.ui, self.repo)
         t = formatter.maketemplater(self.repo.ui, '{join(obsfate, "\n")}',
                                     defaults=templatekw.keywords,
                                     resources=tres)
         obsfate = t.render({'ctx': ctx, 'revcache': {}}).splitlines()
 
         if obsfate:
             for obsfateline in obsfate:
                 self.ui.write(self._columns['obsolete'] % obsfateline,
                               label='log.obsfate')
 
     def _exthook(self, ctx):
         '''empty method used by extension as a hook point
         '''
 
     def _showpatch(self, ctx):
         stat = self.diffopts.get('stat')
         diff = self.diffopts.get('patch')
         diffopts = patch.diffallopts(self.ui, self.diffopts)
         if stat:
             self._differ.showdiff(self.ui, ctx, diffopts, stat=True)
         if stat and diff:
             self.ui.write("\n")
         if diff:
             self._differ.showdiff(self.ui, ctx, diffopts, stat=False)
         if stat or diff:
             self.ui.write("\n")
 
 class jsonchangeset(changesetprinter):
     '''format changeset information.'''
 
     def __init__(self, ui, repo, differ=None, diffopts=None, buffered=False):
         changesetprinter.__init__(self, ui, repo, differ, diffopts, buffered)
         self.cache = {}
         self._first = True
 
     def close(self):
         if not self._first:
             self.ui.write("\n]\n")
         else:
             self.ui.write("[]\n")
 
     def _show(self, ctx, copies, props):
         '''show a single changeset or file revision'''
         rev = ctx.rev()
         if rev is None:
             jrev = jnode = 'null'
         else:
             jrev = '%d' % rev
             jnode = '"%s"' % hex(ctx.node())
         j = encoding.jsonescape
 
         if self._first:
             self.ui.write("[\n {")
             self._first = False
         else:
             self.ui.write(",\n {")
 
         if self.ui.quiet:
             self.ui.write(('\n  "rev": %s') % jrev)
             self.ui.write((',\n  "node": %s') % jnode)
             self.ui.write('\n }')
             return
 
         self.ui.write(('\n  "rev": %s') % jrev)
         self.ui.write((',\n  "node": %s') % jnode)
         self.ui.write((',\n  "branch": "%s"') % j(ctx.branch()))
         self.ui.write((',\n  "phase": "%s"') % ctx.phasestr())
         self.ui.write((',\n  "user": "%s"') % j(ctx.user()))
         self.ui.write((',\n  "date": [%d, %d]') % ctx.date())
         self.ui.write((',\n  "desc": "%s"') % j(ctx.description()))
 
         self.ui.write((',\n  "bookmarks": [%s]') %
                       ", ".join('"%s"' % j(b) for b in ctx.bookmarks()))
         self.ui.write((',\n  "tags": [%s]') %
                       ", ".join('"%s"' % j(t) for t in ctx.tags()))
         self.ui.write((',\n  "parents": [%s]') %
                       ", ".join('"%s"' % c.hex() for c in ctx.parents()))
 
         if self.ui.debugflag:
             if rev is None:
                 jmanifestnode = 'null'
             else:
                 jmanifestnode = '"%s"' % hex(ctx.manifestnode())
             self.ui.write((',\n  "manifest": %s') % jmanifestnode)
 
             self.ui.write((',\n  "extra": {%s}') %
                           ", ".join('"%s": "%s"' % (j(k), j(v))
                                     for k, v in ctx.extra().items()))
 
             files = ctx.p1().status(ctx)
             self.ui.write((',\n  "modified": [%s]') %
                           ", ".join('"%s"' % j(f) for f in files[0]))
             self.ui.write((',\n  "added": [%s]') %
                           ", ".join('"%s"' % j(f) for f in files[1]))
             self.ui.write((',\n  "removed": [%s]') %
                           ", ".join('"%s"' % j(f) for f in files[2]))
 
         elif self.ui.verbose:
             self.ui.write((',\n  "files": [%s]') %
                           ", ".join('"%s"' % j(f) for f in ctx.files()))
 
             if copies:
                 self.ui.write((',\n  "copies": {%s}') %
                               ", ".join('"%s": "%s"' % (j(k), j(v))
                                                         for k, v in copies))
 
         stat = self.diffopts.get('stat')
         diff = self.diffopts.get('patch')
         diffopts = patch.difffeatureopts(self.ui, self.diffopts, git=True)
         if stat:
             self.ui.pushbuffer()
             self._differ.showdiff(self.ui, ctx, diffopts, stat=True)
             self.ui.write((',\n  "diffstat": "%s"')
                           % j(self.ui.popbuffer()))
         if diff:
             self.ui.pushbuffer()
             self._differ.showdiff(self.ui, ctx, diffopts, stat=False)
             self.ui.write((',\n  "diff": "%s"') % j(self.ui.popbuffer()))
 
         self.ui.write("\n }")
 
 class changesettemplater(changesetprinter):
     '''format changeset information.
 
     Note: there are a variety of convenience functions to build a
     changesettemplater for common cases. See functions such as:
     maketemplater, changesetdisplayer, buildcommittemplate, or other
     functions that use changesest_templater.
     '''
 
     # Arguments before "buffered" used to be positional. Consider not
     # adding/removing arguments before "buffered" to not break callers.
     def __init__(self, ui, repo, tmplspec, differ=None, diffopts=None,
                  buffered=False):
         changesetprinter.__init__(self, ui, repo, differ, diffopts, buffered)
         tres = formatter.templateresources(ui, repo)
         self.t = formatter.loadtemplater(ui, tmplspec,
                                          defaults=templatekw.keywords,
                                          resources=tres,
                                          cache=templatekw.defaulttempl)
         self._counter = itertools.count()
-        self.cache = tres['cache']  # shared with _graphnodeformatter()
+        self._getcache = tres['cache']  # shared with _graphnodeformatter()
 
         self._tref = tmplspec.ref
         self._parts = {'header': '', 'footer': '',
                        tmplspec.ref: tmplspec.ref,
                        'docheader': '', 'docfooter': '',
                        'separator': ''}
         if tmplspec.mapfile:
             # find correct templates for current mode, for backward
             # compatibility with 'log -v/-q/--debug' using a mapfile
             tmplmodes = [
                 (True, ''),
                 (self.ui.verbose, '_verbose'),
                 (self.ui.quiet, '_quiet'),
                 (self.ui.debugflag, '_debug'),
             ]
             for mode, postfix in tmplmodes:
                 for t in self._parts:
                     cur = t + postfix
                     if mode and cur in self.t:
                         self._parts[t] = cur
         else:
             partnames = [p for p in self._parts.keys() if p != tmplspec.ref]
             m = formatter.templatepartsmap(tmplspec, self.t, partnames)
             self._parts.update(m)
 
         if self._parts['docheader']:
             self.ui.write(
                 templateutil.stringify(self.t(self._parts['docheader'])))
 
     def close(self):
         if self._parts['docfooter']:
             if not self.footer:
                 self.footer = ""
             self.footer += templateutil.stringify(
                 self.t(self._parts['docfooter']))
         return super(changesettemplater, self).close()
 
     def _show(self, ctx, copies, props):
         '''show a single changeset or file revision'''
         props = props.copy()
         props['ctx'] = ctx
         props['index'] = index = next(self._counter)
         props['revcache'] = {'copies': copies}
         props = pycompat.strkwargs(props)
 
         # write separator, which wouldn't work well with the header part below
         # since there's inherently a conflict between header (across items) and
         # separator (per item)
         if self._parts['separator'] and index > 0:
             self.ui.write(
                 templateutil.stringify(self.t(self._parts['separator'])))
 
         # write header
         if self._parts['header']:
             h = templateutil.stringify(self.t(self._parts['header'], **props))
             if self.buffered:
                 self.header[ctx.rev()] = h
             else:
                 if self.lastheader != h:
                     self.lastheader = h
                     self.ui.write(h)
 
         # write changeset metadata, then patch if requested
         key = self._parts[self._tref]
         self.ui.write(templateutil.stringify(self.t(key, **props)))
         self._showpatch(ctx)
 
         if self._parts['footer']:
             if not self.footer:
                 self.footer = templateutil.stringify(
                     self.t(self._parts['footer'], **props))
 
 def templatespec(tmpl, mapfile):
     if mapfile:
         return formatter.templatespec('changeset', tmpl, mapfile)
     else:
         return formatter.templatespec('', tmpl, None)
 
 def _lookuptemplate(ui, tmpl, style):
     """Find the template matching the given template spec or style
 
     See formatter.lookuptemplate() for details.
     """
 
     # ui settings
     if not tmpl and not style: # template are stronger than style
         tmpl = ui.config('ui', 'logtemplate')
         if tmpl:
             return templatespec(templater.unquotestring(tmpl), None)
         else:
             style = util.expandpath(ui.config('ui', 'style'))
 
     if not tmpl and style:
         mapfile = style
         if not os.path.split(mapfile)[0]:
             mapname = (templater.templatepath('map-cmdline.' + mapfile)
                        or templater.templatepath(mapfile))
             if mapname:
                 mapfile = mapname
         return templatespec(None, mapfile)
 
     if not tmpl:
         return templatespec(None, None)
 
     return formatter.lookuptemplate(ui, 'changeset', tmpl)
 
 def maketemplater(ui, repo, tmpl, buffered=False):
     """Create a changesettemplater from a literal template 'tmpl'
     byte-string."""
     spec = templatespec(tmpl, None)
     return changesettemplater(ui, repo, spec, buffered=buffered)
 
 def changesetdisplayer(ui, repo, opts, differ=None, buffered=False):
     """show one changeset using template or regular display.
 
     Display format will be the first non-empty hit of:
     1. option 'template'
     2. option 'style'
     3. [ui] setting 'logtemplate'
     4. [ui] setting 'style'
     If all of these values are either the unset or the empty string,
     regular display via changesetprinter() is done.
     """
     postargs = (differ, opts, buffered)
     if opts.get('template') == 'json':
         return jsonchangeset(ui, repo, *postargs)
 
     spec = _lookuptemplate(ui, opts.get('template'), opts.get('style'))
 
     if not spec.ref and not spec.tmpl and not spec.mapfile:
         return changesetprinter(ui, repo, *postargs)
 
     return changesettemplater(ui, repo, spec, *postargs)
 
 def _makematcher(repo, revs, pats, opts):
     """Build matcher and expanded patterns from log options
 
     If --follow, revs are the revisions to follow from.
 
     Returns (match, pats, slowpath) where
     - match: a matcher built from the given pats and -I/-X opts
     - pats: patterns used (globs are expanded on Windows)
     - slowpath: True if patterns aren't as simple as scanning filelogs
     """
     # pats/include/exclude are passed to match.match() directly in
     # _matchfiles() revset but walkchangerevs() builds its matcher with
     # scmutil.match(). The difference is input pats are globbed on
     # platforms without shell expansion (windows).
     wctx = repo[None]
     match, pats = scmutil.matchandpats(wctx, pats, opts)
     slowpath = match.anypats() or (not match.always() and opts.get('removed'))
     if not slowpath:
         follow = opts.get('follow') or opts.get('follow_first')
         startctxs = []
         if follow and opts.get('rev'):
             startctxs = [repo[r] for r in revs]
         for f in match.files():
             if follow and startctxs:
                 # No idea if the path was a directory at that revision, so
                 # take the slow path.
                 if any(f not in c for c in startctxs):
                     slowpath = True
                     continue
             elif follow and f not in wctx:
                 # If the file exists, it may be a directory, so let it
                 # take the slow path.
                 if os.path.exists(repo.wjoin(f)):
                     slowpath = True
                     continue
                 else:
                     raise error.Abort(_('cannot follow file not in parent '
                                         'revision: "%s"') % f)
             filelog = repo.file(f)
             if not filelog:
                 # A zero count may be a directory or deleted file, so
                 # try to find matching entries on the slow path.
                 if follow:
                     raise error.Abort(
                         _('cannot follow nonexistent file: "%s"') % f)
                 slowpath = True
 
         # We decided to fall back to the slowpath because at least one
         # of the paths was not a file. Check to see if at least one of them
         # existed in history - in that case, we'll continue down the
         # slowpath; otherwise, we can turn off the slowpath
         if slowpath:
             for path in match.files():
                 if path == '.' or path in repo.store:
                     break
             else:
                 slowpath = False
 
     return match, pats, slowpath
 
 def _fileancestors(repo, revs, match, followfirst):
     fctxs = []
     for r in revs:
         ctx = repo[r]
         fctxs.extend(ctx[f].introfilectx() for f in ctx.walk(match))
 
     # When displaying a revision with --patch --follow FILE, we have
     # to know which file of the revision must be diffed. With
     # --follow, we want the names of the ancestors of FILE in the
     # revision, stored in "fcache". "fcache" is populated as a side effect
     # of the graph traversal.
     fcache = {}
     def filematcher(ctx):
         return scmutil.matchfiles(repo, fcache.get(ctx.rev(), []))
 
     def revgen():
         for rev, cs in dagop.filectxancestors(fctxs, followfirst=followfirst):
             fcache[rev] = [c.path() for c in cs]
             yield rev
     return smartset.generatorset(revgen(), iterasc=False), filematcher
 
 def _makenofollowfilematcher(repo, pats, opts):
     '''hook for extensions to override the filematcher for non-follow cases'''
     return None
 
 _opt2logrevset = {
     'no_merges':        ('not merge()', None),
     'only_merges':      ('merge()', None),
     '_matchfiles':      (None, '_matchfiles(%ps)'),
     'date':             ('date(%s)', None),
     'branch':           ('branch(%s)', '%lr'),
     '_patslog':         ('filelog(%s)', '%lr'),
     'keyword':          ('keyword(%s)', '%lr'),
     'prune':            ('ancestors(%s)', 'not %lr'),
     'user':             ('user(%s)', '%lr'),
 }
 
 def _makerevset(repo, match, pats, slowpath, opts):
     """Return a revset string built from log options and file patterns"""
     opts = dict(opts)
     # follow or not follow?
     follow = opts.get('follow') or opts.get('follow_first')
 
     # branch and only_branch are really aliases and must be handled at
     # the same time
     opts['branch'] = opts.get('branch', []) + opts.get('only_branch', [])
     opts['branch'] = [repo.lookupbranch(b) for b in opts['branch']]
 
     if slowpath:
         # See walkchangerevs() slow path.
         #
         # pats/include/exclude cannot be represented as separate
         # revset expressions as their filtering logic applies at file
         # level. For instance "-I a -X b" matches a revision touching
         # "a" and "b" while "file(a) and not file(b)" does
         # not. Besides, filesets are evaluated against the working
         # directory.
         matchargs = ['r:', 'd:relpath']
         for p in pats:
             matchargs.append('p:' + p)
         for p in opts.get('include', []):
             matchargs.append('i:' + p)
         for p in opts.get('exclude', []):
             matchargs.append('x:' + p)
         opts['_matchfiles'] = matchargs
     elif not follow:
         opts['_patslog'] = list(pats)
 
     expr = []
     for op, val in sorted(opts.iteritems()):
         if not val:
             continue
         if op not in _opt2logrevset:
             continue
         revop, listop = _opt2logrevset[op]
         if revop and '%' not in revop:
             expr.append(revop)
         elif not listop:
             expr.append(revsetlang.formatspec(revop, val))
         else:
             if revop:
                 val = [revsetlang.formatspec(revop, v) for v in val]
             expr.append(revsetlang.formatspec(listop, val))
 
     if expr:
         expr = '(' + ' and '.join(expr) + ')'
     else:
         expr = None
     return expr
 
 def _initialrevs(repo, opts):
     """Return the initial set of revisions to be filtered or followed"""
     follow = opts.get('follow') or opts.get('follow_first')
     if opts.get('rev'):
         revs = scmutil.revrange(repo, opts['rev'])
     elif follow and repo.dirstate.p1() == nullid:
         revs = smartset.baseset()
     elif follow:
         revs = repo.revs('.')
     else:
         revs = smartset.spanset(repo)
         revs.reverse()
     return revs
 
 def getrevs(repo, pats, opts):
     """Return (revs, differ) where revs is a smartset
 
     differ is a changesetdiffer with pre-configured file matcher.
     """
     follow = opts.get('follow') or opts.get('follow_first')
     followfirst = opts.get('follow_first')
     limit = getlimit(opts)
     revs = _initialrevs(repo, opts)
     if not revs:
         return smartset.baseset(), None
     match, pats, slowpath = _makematcher(repo, revs, pats, opts)
     filematcher = None
     if follow:
         if slowpath or match.always():
             revs = dagop.revancestors(repo, revs, followfirst=followfirst)
         else:
             revs, filematcher = _fileancestors(repo, revs, match, followfirst)
         revs.reverse()
     if filematcher is None:
         filematcher = _makenofollowfilematcher(repo, pats, opts)
     if filematcher is None:
         def filematcher(ctx):
             return match
 
     expr = _makerevset(repo, match, pats, slowpath, opts)
     if opts.get('graph') and opts.get('rev'):
         # User-specified revs might be unsorted, but don't sort before
         # _makerevset because it might depend on the order of revs
         if not (revs.isdescending() or revs.istopo()):
             revs.sort(reverse=True)
     if expr:
         matcher = revset.match(None, expr)
         revs = matcher(repo, revs)
     if limit is not None:
         revs = revs.slice(0, limit)
 
     differ = changesetdiffer()
     differ._makefilematcher = filematcher
     return revs, differ
 
 def _parselinerangeopt(repo, opts):
     """Parse --line-range log option and return a list of tuples (filename,
     (fromline, toline)).
     """
     linerangebyfname = []
     for pat in opts.get('line_range', []):
         try:
             pat, linerange = pat.rsplit(',', 1)
         except ValueError:
             raise error.Abort(_('malformatted line-range pattern %s') % pat)
         try:
             fromline, toline = map(int, linerange.split(':'))
         except ValueError:
             raise error.Abort(_("invalid line range for %s") % pat)
         msg = _("line range pattern '%s' must match exactly one file") % pat
         fname = scmutil.parsefollowlinespattern(repo, None, pat, msg)
         linerangebyfname.append(
             (fname, util.processlinerange(fromline, toline)))
     return linerangebyfname
 
 def getlinerangerevs(repo, userrevs, opts):
     """Return (revs, differ).
 
     "revs" are revisions obtained by processing "line-range" log options and
     walking block ancestors of each specified file/line-range.
 
     "differ" is a changesetdiffer with pre-configured file matcher and hunks
     filter.
     """
     wctx = repo[None]
 
     # Two-levels map of "rev -> file ctx -> [line range]".
     linerangesbyrev = {}
     for fname, (fromline, toline) in _parselinerangeopt(repo, opts):
         if fname not in wctx:
             raise error.Abort(_('cannot follow file not in parent '
                                 'revision: "%s"') % fname)
         fctx = wctx.filectx(fname)
         for fctx, linerange in dagop.blockancestors(fctx, fromline, toline):
             rev = fctx.introrev()
             if rev not in userrevs:
                 continue
             linerangesbyrev.setdefault(
                 rev, {}).setdefault(
                     fctx.path(), []).append(linerange)
 
     def nofilterhunksfn(fctx, hunks):
         return hunks
 
     def hunksfilter(ctx):
         fctxlineranges = linerangesbyrev.get(ctx.rev())
         if fctxlineranges is None:
             return nofilterhunksfn
 
         def filterfn(fctx, hunks):
             lineranges = fctxlineranges.get(fctx.path())
             if lineranges is not None:
                 for hr, lines in hunks:
                     if hr is None: # binary
                         yield hr, lines
                         continue
                     if any(mdiff.hunkinrange(hr[2:], lr)
                            for lr in lineranges):
                         yield hr, lines
             else:
                 for hunk in hunks:
                     yield hunk
 
         return filterfn
 
     def filematcher(ctx):
         files = list(linerangesbyrev.get(ctx.rev(), []))
         return scmutil.matchfiles(repo, files)
 
     revs = sorted(linerangesbyrev, reverse=True)
 
     differ = changesetdiffer()
     differ._makefilematcher = filematcher
     differ._makehunksfilter = hunksfilter
     return revs, differ
 
 def _graphnodeformatter(ui, displayer):
     spec = ui.config('ui', 'graphnodetemplate')
     if not spec:
         return templatekw.getgraphnode  # fast path for "{graphnode}"
 
     spec = templater.unquotestring(spec)
     tres = formatter.templateresources(ui)
     if isinstance(displayer, changesettemplater):
-        tres['cache'] = displayer.cache  # reuse cache of slow templates
+        # reuse cache of slow templates
+        tres['cache'] = displayer._getcache
     templ = formatter.maketemplater(ui, spec, defaults=templatekw.keywords,
                                     resources=tres)
     def formatnode(repo, ctx):
         props = {'ctx': ctx, 'repo': repo, 'revcache': {}}
         return templ.render(props)
     return formatnode
 
 def displaygraph(ui, repo, dag, displayer, edgefn, getrenamed=None, props=None):
     props = props or {}
     formatnode = _graphnodeformatter(ui, displayer)
     state = graphmod.asciistate()
     styles = state['styles']
 
     # only set graph styling if HGPLAIN is not set.
     if ui.plain('graph'):
         # set all edge styles to |, the default pre-3.8 behaviour
         styles.update(dict.fromkeys(styles, '|'))
     else:
         edgetypes = {
             'parent': graphmod.PARENT,
             'grandparent': graphmod.GRANDPARENT,
             'missing': graphmod.MISSINGPARENT
         }
         for name, key in edgetypes.items():
             # experimental config: experimental.graphstyle.*
             styles[key] = ui.config('experimental', 'graphstyle.%s' % name,
                                     styles[key])
             if not styles[key]:
                 styles[key] = None
 
         # experimental config: experimental.graphshorten
         state['graphshorten'] = ui.configbool('experimental', 'graphshorten')
 
     for rev, type, ctx, parents in dag:
         char = formatnode(repo, ctx)
         copies = None
         if getrenamed and ctx.rev():
             copies = []
             for fn in ctx.files():
                 rename = getrenamed(fn, ctx.rev())
                 if rename:
                     copies.append((fn, rename[0]))
         edges = edgefn(type, char, state, rev, parents)
         firstedge = next(edges)
         width = firstedge[2]
         displayer.show(ctx, copies=copies,
                        graphwidth=width, **pycompat.strkwargs(props))
         lines = displayer.hunk.pop(rev).split('\n')
         if not lines[-1]:
             del lines[-1]
         displayer.flush(ctx)
         for type, char, width, coldata in itertools.chain([firstedge], edges):
             graphmod.ascii(ui, state, type, char, lines, coldata)
             lines = []
     displayer.close()
 
 def displaygraphrevs(ui, repo, revs, displayer, getrenamed):
     revdag = graphmod.dagwalker(repo, revs)
     displaygraph(ui, repo, revdag, displayer, graphmod.asciiedges, getrenamed)
 
 def displayrevs(ui, repo, revs, displayer, getrenamed):
     for rev in revs:
         ctx = repo[rev]
         copies = None
         if getrenamed is not None and rev:
             copies = []
             for fn in ctx.files():
                 rename = getrenamed(fn, rev)
                 if rename:
                     copies.append((fn, rename[0]))
         displayer.show(ctx, copies=copies)
         displayer.flush(ctx)
     displayer.close()
 
 def checkunsupportedgraphflags(pats, opts):
     for op in ["newest_first"]:
         if op in opts and opts[op]:
             raise error.Abort(_("-G/--graph option is incompatible with --%s")
                              % op.replace("_", "-"))
 
 def graphrevs(repo, nodes, opts):
     limit = getlimit(opts)
     nodes.reverse()
     if limit is not None:
         nodes = nodes[:limit]
     return graphmod.nodes(repo, nodes)

mercurial/templater.py

@@ -1,799 +1,800
 # templater.py - template expansion for output
 #
 # Copyright 2005, 2006 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, print_function
 
 import os
 
 from .i18n import _
 from . import (
     config,
     encoding,
     error,
     parser,
     pycompat,
     templatefilters,
     templatefuncs,
     templateutil,
     util,
 )
 
 # template parsing
 
 elements = {
     # token-type: binding-strength, primary, prefix, infix, suffix
     "(": (20, None, ("group", 1, ")"), ("func", 1, ")"), None),
     ".": (18, None, None, (".", 18), None),
     "%": (15, None, None, ("%", 15), None),
     "|": (15, None, None, ("|", 15), None),
     "*": (5, None, None, ("*", 5), None),
     "/": (5, None, None, ("/", 5), None),
     "+": (4, None, None, ("+", 4), None),
     "-": (4, None, ("negate", 19), ("-", 4), None),
     "=": (3, None, None, ("keyvalue", 3), None),
     ",": (2, None, None, ("list", 2), None),
     ")": (0, None, None, None, None),
     "integer": (0, "integer", None, None, None),
     "symbol": (0, "symbol", None, None, None),
     "string": (0, "string", None, None, None),
     "template": (0, "template", None, None, None),
     "end": (0, None, None, None, None),
 }
 
 def tokenize(program, start, end, term=None):
     """Parse a template expression into a stream of tokens, which must end
     with term if specified"""
     pos = start
     program = pycompat.bytestr(program)
     while pos < end:
         c = program[pos]
         if c.isspace(): # skip inter-token whitespace
             pass
         elif c in "(=,).%|+-*/": # handle simple operators
             yield (c, None, pos)
         elif c in '"\'': # handle quoted templates
             s = pos + 1
             data, pos = _parsetemplate(program, s, end, c)
             yield ('template', data, s)
             pos -= 1
         elif c == 'r' and program[pos:pos + 2] in ("r'", 'r"'):
             # handle quoted strings
             c = program[pos + 1]
             s = pos = pos + 2
             while pos < end: # find closing quote
                 d = program[pos]
                 if d == '\\': # skip over escaped characters
                     pos += 2
                     continue
                 if d == c:
                     yield ('string', program[s:pos], s)
                     break
                 pos += 1
             else:
                 raise error.ParseError(_("unterminated string"), s)
         elif c.isdigit():
             s = pos
             while pos < end:
                 d = program[pos]
                 if not d.isdigit():
                     break
                 pos += 1
             yield ('integer', program[s:pos], s)
             pos -= 1
         elif (c == '\\' and program[pos:pos + 2] in (br"\'", br'\"')
               or c == 'r' and program[pos:pos + 3] in (br"r\'", br'r\"')):
             # handle escaped quoted strings for compatibility with 2.9.2-3.4,
             # where some of nested templates were preprocessed as strings and
             # then compiled. therefore, \"...\" was allowed. (issue4733)
             #
             # processing flow of _evalifliteral() at 5ab28a2e9962:
             # outer template string    -> stringify()  -> compiletemplate()
             # ------------------------    ------------    ------------------
             # {f("\\\\ {g(\"\\\"\")}"}    \\ {g("\"")}    [r'\\', {g("\"")}]
             #             ~~~~~~~~
             #             escaped quoted string
             if c == 'r':
                 pos += 1
                 token = 'string'
             else:
                 token = 'template'
             quote = program[pos:pos + 2]
             s = pos = pos + 2
             while pos < end: # find closing escaped quote
                 if program.startswith('\\\\\\', pos, end):
                     pos += 4 # skip over double escaped characters
                     continue
                 if program.startswith(quote, pos, end):
                     # interpret as if it were a part of an outer string
                     data = parser.unescapestr(program[s:pos])
                     if token == 'template':
                         data = _parsetemplate(data, 0, len(data))[0]
                     yield (token, data, s)
                     pos += 1
                     break
                 pos += 1
             else:
                 raise error.ParseError(_("unterminated string"), s)
         elif c.isalnum() or c in '_':
             s = pos
             pos += 1
             while pos < end: # find end of symbol
                 d = program[pos]
                 if not (d.isalnum() or d == "_"):
                     break
                 pos += 1
             sym = program[s:pos]
             yield ('symbol', sym, s)
             pos -= 1
         elif c == term:
             yield ('end', None, pos)
             return
         else:
             raise error.ParseError(_("syntax error"), pos)
         pos += 1
     if term:
         raise error.ParseError(_("unterminated template expansion"), start)
     yield ('end', None, pos)
 
 def _parsetemplate(tmpl, start, stop, quote=''):
     r"""
     >>> _parsetemplate(b'foo{bar}"baz', 0, 12)
     ([('string', 'foo'), ('symbol', 'bar'), ('string', '"baz')], 12)
     >>> _parsetemplate(b'foo{bar}"baz', 0, 12, quote=b'"')
     ([('string', 'foo'), ('symbol', 'bar')], 9)
     >>> _parsetemplate(b'foo"{bar}', 0, 9, quote=b'"')
     ([('string', 'foo')], 4)
     >>> _parsetemplate(br'foo\"bar"baz', 0, 12, quote=b'"')
     ([('string', 'foo"'), ('string', 'bar')], 9)
     >>> _parsetemplate(br'foo\\"bar', 0, 10, quote=b'"')
     ([('string', 'foo\\')], 6)
     """
     parsed = []
     for typ, val, pos in _scantemplate(tmpl, start, stop, quote):
         if typ == 'string':
             parsed.append((typ, val))
         elif typ == 'template':
             parsed.append(val)
         elif typ == 'end':
             return parsed, pos
         else:
             raise error.ProgrammingError('unexpected type: %s' % typ)
     raise error.ProgrammingError('unterminated scanning of template')
 
 def scantemplate(tmpl, raw=False):
     r"""Scan (type, start, end) positions of outermost elements in template
 
     If raw=True, a backslash is not taken as an escape character just like
     r'' string in Python. Note that this is different from r'' literal in
     template in that no template fragment can appear in r'', e.g. r'{foo}'
     is a literal '{foo}', but ('{foo}', raw=True) is a template expression
     'foo'.
 
     >>> list(scantemplate(b'foo{bar}"baz'))
     [('string', 0, 3), ('template', 3, 8), ('string', 8, 12)]
     >>> list(scantemplate(b'outer{"inner"}outer'))
     [('string', 0, 5), ('template', 5, 14), ('string', 14, 19)]
     >>> list(scantemplate(b'foo\\{escaped}'))
     [('string', 0, 5), ('string', 5, 13)]
     >>> list(scantemplate(b'foo\\{escaped}', raw=True))
     [('string', 0, 4), ('template', 4, 13)]
     """
     last = None
     for typ, val, pos in _scantemplate(tmpl, 0, len(tmpl), raw=raw):
         if last:
             yield last + (pos,)
         if typ == 'end':
             return
         else:
             last = (typ, pos)
     raise error.ProgrammingError('unterminated scanning of template')
 
 def _scantemplate(tmpl, start, stop, quote='', raw=False):
     """Parse template string into chunks of strings and template expressions"""
     sepchars = '{' + quote
     unescape = [parser.unescapestr, pycompat.identity][raw]
     pos = start
     p = parser.parser(elements)
     try:
         while pos < stop:
             n = min((tmpl.find(c, pos, stop) for c in sepchars),
                     key=lambda n: (n < 0, n))
             if n < 0:
                 yield ('string', unescape(tmpl[pos:stop]), pos)
                 pos = stop
                 break
             c = tmpl[n:n + 1]
             bs = 0  # count leading backslashes
             if not raw:
                 bs = (n - pos) - len(tmpl[pos:n].rstrip('\\'))
             if bs % 2 == 1:
                 # escaped (e.g. '\{', '\\\{', but not '\\{')
                 yield ('string', unescape(tmpl[pos:n - 1]) + c, pos)
                 pos = n + 1
                 continue
             if n > pos:
                 yield ('string', unescape(tmpl[pos:n]), pos)
             if c == quote:
                 yield ('end', None, n + 1)
                 return
 
             parseres, pos = p.parse(tokenize(tmpl, n + 1, stop, '}'))
             if not tmpl.startswith('}', pos):
                 raise error.ParseError(_("invalid token"), pos)
             yield ('template', parseres, n)
             pos += 1
 
         if quote:
             raise error.ParseError(_("unterminated string"), start)
     except error.ParseError as inst:
         if len(inst.args) > 1:  # has location
             loc = inst.args[1]
             # Offset the caret location by the number of newlines before the
             # location of the error, since we will replace one-char newlines
             # with the two-char literal r'\n'.
             offset = tmpl[:loc].count('\n')
             tmpl = tmpl.replace('\n', br'\n')
             # We want the caret to point to the place in the template that
             # failed to parse, but in a hint we get a open paren at the
             # start. Therefore, we print "loc + 1" spaces (instead of "loc")
             # to line up the caret with the location of the error.
             inst.hint = (tmpl + '\n'
                          + ' ' * (loc + 1 + offset) + '^ ' + _('here'))
         raise
     yield ('end', None, pos)
 
 def _unnesttemplatelist(tree):
     """Expand list of templates to node tuple
 
     >>> def f(tree):
     ...     print(pycompat.sysstr(prettyformat(_unnesttemplatelist(tree))))
     >>> f((b'template', []))
     (string '')
     >>> f((b'template', [(b'string', b'foo')]))
     (string 'foo')
     >>> f((b'template', [(b'string', b'foo'), (b'symbol', b'rev')]))
     (template
       (string 'foo')
       (symbol 'rev'))
     >>> f((b'template', [(b'symbol', b'rev')]))  # template(rev) -> str
     (template
       (symbol 'rev'))
     >>> f((b'template', [(b'template', [(b'string', b'foo')])]))
     (string 'foo')
     """
     if not isinstance(tree, tuple):
         return tree
     op = tree[0]
     if op != 'template':
         return (op,) + tuple(_unnesttemplatelist(x) for x in tree[1:])
 
     assert len(tree) == 2
     xs = tuple(_unnesttemplatelist(x) for x in tree[1])
     if not xs:
         return ('string', '')  # empty template ""
     elif len(xs) == 1 and xs[0][0] == 'string':
         return xs[0]  # fast path for string with no template fragment "x"
     else:
         return (op,) + xs
 
 def parse(tmpl):
     """Parse template string into tree"""
     parsed, pos = _parsetemplate(tmpl, 0, len(tmpl))
     assert pos == len(tmpl), 'unquoted template should be consumed'
     return _unnesttemplatelist(('template', parsed))
 
 def _parseexpr(expr):
     """Parse a template expression into tree
 
     >>> _parseexpr(b'"foo"')
     ('string', 'foo')
     >>> _parseexpr(b'foo(bar)')
     ('func', ('symbol', 'foo'), ('symbol', 'bar'))
     >>> _parseexpr(b'foo(')
     Traceback (most recent call last):
       ...
     ParseError: ('not a prefix: end', 4)
     >>> _parseexpr(b'"foo" "bar"')
     Traceback (most recent call last):
       ...
     ParseError: ('invalid token', 7)
     """
     p = parser.parser(elements)
     tree, pos = p.parse(tokenize(expr, 0, len(expr)))
     if pos != len(expr):
         raise error.ParseError(_('invalid token'), pos)
     return _unnesttemplatelist(tree)
 
 def prettyformat(tree):
     return parser.prettyformat(tree, ('integer', 'string', 'symbol'))
 
 def compileexp(exp, context, curmethods):
     """Compile parsed template tree to (func, data) pair"""
     if not exp:
         raise error.ParseError(_("missing argument"))
     t = exp[0]
     if t in curmethods:
         return curmethods[t](exp, context)
     raise error.ParseError(_("unknown method '%s'") % t)
 
 # template evaluation
 
 def getsymbol(exp):
     if exp[0] == 'symbol':
         return exp[1]
     raise error.ParseError(_("expected a symbol, got '%s'") % exp[0])
 
 def getlist(x):
     if not x:
         return []
     if x[0] == 'list':
         return getlist(x[1]) + [x[2]]
     return [x]
 
 def gettemplate(exp, context):
     """Compile given template tree or load named template from map file;
     returns (func, data) pair"""
     if exp[0] in ('template', 'string'):
         return compileexp(exp, context, methods)
     if exp[0] == 'symbol':
         # unlike runsymbol(), here 'symbol' is always taken as template name
         # even if it exists in mapping. this allows us to override mapping
         # by web templates, e.g. 'changelogtag' is redefined in map file.
         return context._load(exp[1])
     raise error.ParseError(_("expected template specifier"))
 
 def _runrecursivesymbol(context, mapping, key):
     raise error.Abort(_("recursive reference '%s' in template") % key)
 
 def buildtemplate(exp, context):
     ctmpl = [compileexp(e, context, methods) for e in exp[1:]]
     return (templateutil.runtemplate, ctmpl)
 
 def buildfilter(exp, context):
     n = getsymbol(exp[2])
     if n in context._filters:
         filt = context._filters[n]
         arg = compileexp(exp[1], context, methods)
         return (templateutil.runfilter, (arg, filt))
     if n in context._funcs:
         f = context._funcs[n]
         args = _buildfuncargs(exp[1], context, methods, n, f._argspec)
         return (f, args)
     raise error.ParseError(_("unknown function '%s'") % n)
 
 def buildmap(exp, context):
     darg = compileexp(exp[1], context, methods)
     targ = gettemplate(exp[2], context)
     return (templateutil.runmap, (darg, targ))
 
 def buildmember(exp, context):
     darg = compileexp(exp[1], context, methods)
     memb = getsymbol(exp[2])
     return (templateutil.runmember, (darg, memb))
 
 def buildnegate(exp, context):
     arg = compileexp(exp[1], context, exprmethods)
     return (templateutil.runnegate, arg)
 
 def buildarithmetic(exp, context, func):
     left = compileexp(exp[1], context, exprmethods)
     right = compileexp(exp[2], context, exprmethods)
     return (templateutil.runarithmetic, (func, left, right))
 
 def buildfunc(exp, context):
     n = getsymbol(exp[1])
     if n in context._funcs:
         f = context._funcs[n]
         args = _buildfuncargs(exp[2], context, exprmethods, n, f._argspec)
         return (f, args)
     if n in context._filters:
         args = _buildfuncargs(exp[2], context, exprmethods, n, argspec=None)
         if len(args) != 1:
             raise error.ParseError(_("filter %s expects one argument") % n)
         f = context._filters[n]
         return (templateutil.runfilter, (args[0], f))
     raise error.ParseError(_("unknown function '%s'") % n)
 
 def _buildfuncargs(exp, context, curmethods, funcname, argspec):
     """Compile parsed tree of function arguments into list or dict of
     (func, data) pairs
 
     >>> context = engine(lambda t: (runsymbol, t))
     >>> def fargs(expr, argspec):
     ...     x = _parseexpr(expr)
     ...     n = getsymbol(x[1])
     ...     return _buildfuncargs(x[2], context, exprmethods, n, argspec)
     >>> list(fargs(b'a(l=1, k=2)', b'k l m').keys())
     ['l', 'k']
     >>> args = fargs(b'a(opts=1, k=2)', b'**opts')
     >>> list(args.keys()), list(args[b'opts'].keys())
     (['opts'], ['opts', 'k'])
     """
     def compiledict(xs):
         return util.sortdict((k, compileexp(x, context, curmethods))
                              for k, x in xs.iteritems())
     def compilelist(xs):
         return [compileexp(x, context, curmethods) for x in xs]
 
     if not argspec:
         # filter or function with no argspec: return list of positional args
         return compilelist(getlist(exp))
 
     # function with argspec: return dict of named args
     _poskeys, varkey, _keys, optkey = argspec = parser.splitargspec(argspec)
     treeargs = parser.buildargsdict(getlist(exp), funcname, argspec,
                                     keyvaluenode='keyvalue', keynode='symbol')
     compargs = util.sortdict()
     if varkey:
         compargs[varkey] = compilelist(treeargs.pop(varkey))
     if optkey:
         compargs[optkey] = compiledict(treeargs.pop(optkey))
     compargs.update(compiledict(treeargs))
     return compargs
 
 def buildkeyvaluepair(exp, content):
     raise error.ParseError(_("can't use a key-value pair in this context"))
 
 # methods to interpret function arguments or inner expressions (e.g. {_(x)})
 exprmethods = {
     "integer": lambda e, c: (templateutil.runinteger, e[1]),
     "string": lambda e, c: (templateutil.runstring, e[1]),
     "symbol": lambda e, c: (templateutil.runsymbol, e[1]),
     "template": buildtemplate,
     "group": lambda e, c: compileexp(e[1], c, exprmethods),
     ".": buildmember,
     "|": buildfilter,
     "%": buildmap,
     "func": buildfunc,
     "keyvalue": buildkeyvaluepair,
     "+": lambda e, c: buildarithmetic(e, c, lambda a, b: a + b),
     "-": lambda e, c: buildarithmetic(e, c, lambda a, b: a - b),
     "negate": buildnegate,
     "*": lambda e, c: buildarithmetic(e, c, lambda a, b: a * b),
     "/": lambda e, c: buildarithmetic(e, c, lambda a, b: a // b),
     }
 
 # methods to interpret top-level template (e.g. {x}, {x|_}, {x % "y"})
 methods = exprmethods.copy()
 methods["integer"] = exprmethods["symbol"]  # '{1}' as variable
 
 class _aliasrules(parser.basealiasrules):
     """Parsing and expansion rule set of template aliases"""
     _section = _('template alias')
     _parse = staticmethod(_parseexpr)
 
     @staticmethod
     def _trygetfunc(tree):
         """Return (name, args) if tree is func(...) or ...|filter; otherwise
         None"""
         if tree[0] == 'func' and tree[1][0] == 'symbol':
             return tree[1][1], getlist(tree[2])
         if tree[0] == '|' and tree[2][0] == 'symbol':
             return tree[2][1], [tree[1]]
 
 def expandaliases(tree, aliases):
     """Return new tree of aliases are expanded"""
     aliasmap = _aliasrules.buildmap(aliases)
     return _aliasrules.expand(aliasmap, tree)
 
 # template engine
 
 def _flatten(thing):
     '''yield a single stream from a possibly nested set of iterators'''
     thing = templateutil.unwraphybrid(thing)
     if isinstance(thing, bytes):
         yield thing
     elif isinstance(thing, str):
         # We can only hit this on Python 3, and it's here to guard
         # against infinite recursion.
         raise error.ProgrammingError('Mercurial IO including templates is done'
                                      ' with bytes, not strings, got %r' % thing)
     elif thing is None:
         pass
     elif not util.safehasattr(thing, '__iter__'):
         yield pycompat.bytestr(thing)
     else:
         for i in thing:
             i = templateutil.unwraphybrid(i)
             if isinstance(i, bytes):
                 yield i
             elif i is None:
                 pass
             elif not util.safehasattr(i, '__iter__'):
                 yield pycompat.bytestr(i)
             else:
                 for j in _flatten(i):
                     yield j
 
 def unquotestring(s):
     '''unwrap quotes if any; otherwise returns unmodified string'''
     if len(s) < 2 or s[0] not in "'\"" or s[0] != s[-1]:
         return s
     return s[1:-1]
 
 class engine(object):
     '''template expansion engine.
 
     template expansion works like this. a map file contains key=value
     pairs. if value is quoted, it is treated as string. otherwise, it
     is treated as name of template file.
 
     templater is asked to expand a key in map. it looks up key, and
     looks for strings like this: {foo}. it expands {foo} by looking up
     foo in map, and substituting it. expansion is recursive: it stops
     when there is no more {foo} to replace.
 
     expansion also allows formatting and filtering.
 
     format uses key to expand each item in list. syntax is
     {key%format}.
 
     filter uses function to transform value. syntax is
     {key|filter1|filter2|...}.'''
 
     def __init__(self, loader, filters=None, defaults=None, resources=None,
                  aliases=()):
         self._loader = loader
         if filters is None:
             filters = {}
         self._filters = filters
         self._funcs = templatefuncs.funcs  # make this a parameter if needed
         if defaults is None:
             defaults = {}
         if resources is None:
             resources = {}
         self._defaults = defaults
         self._resources = resources
         self._aliasmap = _aliasrules.buildmap(aliases)
         self._cache = {}  # key: (func, data)
 
     def symbol(self, mapping, key):
         """Resolve symbol to value or function; None if nothing found"""
         v = None
         if key not in self._resources:
             v = mapping.get(key)
         if v is None:
             v = self._defaults.get(key)
         return v
 
     def resource(self, mapping, key):
         """Return internal data (e.g. cache) used for keyword/function
         evaluation"""
         v = None
         if key in self._resources:
             v = mapping.get(key)
-        if v is None:
-            v = self._resources.get(key)
+        if v is None and key in self._resources:
+            v = self._resources[key](self, mapping, key)
         if v is None:
             raise templateutil.ResourceUnavailable(
                 _('template resource not available: %s') % key)
         return v
 
     def _load(self, t):
         '''load, parse, and cache a template'''
         if t not in self._cache:
             # put poison to cut recursion while compiling 't'
             self._cache[t] = (_runrecursivesymbol, t)
             try:
                 x = parse(self._loader(t))
                 if self._aliasmap:
                     x = _aliasrules.expand(self._aliasmap, x)
                 self._cache[t] = compileexp(x, self, methods)
             except: # re-raises
                 del self._cache[t]
                 raise
         return self._cache[t]
 
     def process(self, t, mapping):
         '''Perform expansion. t is name of map element to expand.
         mapping contains added elements for use during expansion. Is a
         generator.'''
         func, data = self._load(t)
         return _flatten(func(self, mapping, data))
 
 engines = {'default': engine}
 
 def stylelist():
     paths = templatepaths()
     if not paths:
         return _('no templates found, try `hg debuginstall` for more info')
     dirlist = os.listdir(paths[0])
     stylelist = []
     for file in dirlist:
         split = file.split(".")
         if split[-1] in ('orig', 'rej'):
             continue
         if split[0] == "map-cmdline":
             stylelist.append(split[1])
     return ", ".join(sorted(stylelist))
 
 def _readmapfile(mapfile):
     """Load template elements from the given map file"""
     if not os.path.exists(mapfile):
         raise error.Abort(_("style '%s' not found") % mapfile,
                           hint=_("available styles: %s") % stylelist())
 
     base = os.path.dirname(mapfile)
     conf = config.config(includepaths=templatepaths())
     conf.read(mapfile, remap={'': 'templates'})
 
     cache = {}
     tmap = {}
     aliases = []
 
     val = conf.get('templates', '__base__')
     if val and val[0] not in "'\"":
         # treat as a pointer to a base class for this style
         path = util.normpath(os.path.join(base, val))
 
         # fallback check in template paths
         if not os.path.exists(path):
             for p in templatepaths():
                 p2 = util.normpath(os.path.join(p, val))
                 if os.path.isfile(p2):
                     path = p2
                     break
                 p3 = util.normpath(os.path.join(p2, "map"))
                 if os.path.isfile(p3):
                     path = p3
                     break
 
         cache, tmap, aliases = _readmapfile(path)
 
     for key, val in conf['templates'].items():
         if not val:
             raise error.ParseError(_('missing value'),
                                    conf.source('templates', key))
         if val[0] in "'\"":
             if val[0] != val[-1]:
                 raise error.ParseError(_('unmatched quotes'),
                                        conf.source('templates', key))
             cache[key] = unquotestring(val)
         elif key != '__base__':
             val = 'default', val
             if ':' in val[1]:
                 val = val[1].split(':', 1)
             tmap[key] = val[0], os.path.join(base, val[1])
     aliases.extend(conf['templatealias'].items())
     return cache, tmap, aliases
 
 class templater(object):
 
     def __init__(self, filters=None, defaults=None, resources=None,
                  cache=None, aliases=(), minchunk=1024, maxchunk=65536):
         """Create template engine optionally with preloaded template fragments
 
         - ``filters``: a dict of functions to transform a value into another.
         - ``defaults``: a dict of symbol values/functions; may be overridden
           by a ``mapping`` dict.
-        - ``resources``: a dict of internal data (e.g. cache), inaccessible
-          from user template; may be overridden by a ``mapping`` dict.
+        - ``resources``: a dict of functions returning internal data
+          (e.g. cache), inaccessible from user template; may be overridden by
+          a ``mapping`` dict.
         - ``cache``: a dict of preloaded template fragments.
         - ``aliases``: a list of alias (name, replacement) pairs.
 
         self.cache may be updated later to register additional template
         fragments.
         """
         if filters is None:
             filters = {}
         if defaults is None:
             defaults = {}
         if resources is None:
             resources = {}
         if cache is None:
             cache = {}
         self.cache = cache.copy()
         self.map = {}
         self.filters = templatefilters.filters.copy()
         self.filters.update(filters)
         self.defaults = defaults
-        self._resources = {'templ': self}
+        self._resources = {'templ': lambda context, mapping, key: self}
         self._resources.update(resources)
         self._aliases = aliases
         self.minchunk, self.maxchunk = minchunk, maxchunk
         self.ecache = {}
 
     @classmethod
     def frommapfile(cls, mapfile, filters=None, defaults=None, resources=None,
                     cache=None, minchunk=1024, maxchunk=65536):
         """Create templater from the specified map file"""
         t = cls(filters, defaults, resources, cache, [], minchunk, maxchunk)
         cache, tmap, aliases = _readmapfile(mapfile)
         t.cache.update(cache)
         t.map = tmap
         t._aliases = aliases
         return t
 
     def __contains__(self, key):
         return key in self.cache or key in self.map
 
     def load(self, t):
         '''Get the template for the given template name. Use a local cache.'''
         if t not in self.cache:
             try:
                 self.cache[t] = util.readfile(self.map[t][1])
             except KeyError as inst:
                 raise templateutil.TemplateNotFound(
                     _('"%s" not in template map') % inst.args[0])
             except IOError as inst:
                 reason = (_('template file %s: %s')
                           % (self.map[t][1], util.forcebytestr(inst.args[1])))
                 raise IOError(inst.args[0], encoding.strfromlocal(reason))
         return self.cache[t]
 
     def render(self, mapping):
         """Render the default unnamed template and return result as string"""
         mapping = pycompat.strkwargs(mapping)
         return templateutil.stringify(self('', **mapping))
 
     def __call__(self, t, **mapping):
         mapping = pycompat.byteskwargs(mapping)
         ttype = t in self.map and self.map[t][0] or 'default'
         if ttype not in self.ecache:
             try:
                 ecls = engines[ttype]
             except KeyError:
                 raise error.Abort(_('invalid template engine: %s') % ttype)
             self.ecache[ttype] = ecls(self.load, self.filters, self.defaults,
                                       self._resources, self._aliases)
         proc = self.ecache[ttype]
 
         stream = proc.process(t, mapping)
         if self.minchunk:
             stream = util.increasingchunks(stream, min=self.minchunk,
                                            max=self.maxchunk)
         return stream
 
 def templatepaths():
     '''return locations used for template files.'''
     pathsrel = ['templates']
     paths = [os.path.normpath(os.path.join(util.datapath, f))
              for f in pathsrel]
     return [p for p in paths if os.path.isdir(p)]
 
 def templatepath(name):
     '''return location of template file. returns None if not found.'''
     for p in templatepaths():
         f = os.path.join(p, name)
         if os.path.exists(f):
             return f
     return None
 
 def stylemap(styles, paths=None):
     """Return path to mapfile for a given style.
 
     Searches mapfile in the following locations:
     1. templatepath/style/map
     2. templatepath/map-style
     3. templatepath/map
     """
 
     if paths is None:
         paths = templatepaths()
     elif isinstance(paths, bytes):
         paths = [paths]
 
     if isinstance(styles, bytes):
         styles = [styles]
 
     for style in styles:
         # only plain name is allowed to honor template paths
         if (not style
             or style in (pycompat.oscurdir, pycompat.ospardir)
             or pycompat.ossep in style
             or pycompat.osaltsep and pycompat.osaltsep in style):
             continue
         locations = [os.path.join(style, 'map'), 'map-' + style]
         locations.append('map')
 
         for path in paths:
             for location in locations:
                 mapfile = os.path.join(path, location)
                 if os.path.isfile(mapfile):
                     return style, mapfile
 
     raise RuntimeError("No hgweb templates found in %r" % paths)

mercurial/templateutil.py

@@ -1,448 +1,449
 # templateutil.py - utility for template evaluation
 #
 # Copyright 2005, 2006 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 types
 
 from .i18n import _
 from . import (
     error,
     pycompat,
     util,
 )
 
 class ResourceUnavailable(error.Abort):
     pass
 
 class TemplateNotFound(error.Abort):
     pass
 
 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=None, gen=None):
     """Wrap data to support both dict-like and string-like operations"""
     prefmt = pycompat.identity
     if fmt is None:
         fmt = '%s=%s'
         prefmt = pycompat.bytestr
     return hybrid(gen, data, lambda k: {key: k, value: data[k]},
                   lambda k: fmt % (prefmt(k), prefmt(data[k])))
 
 def hybridlist(data, name, fmt=None, gen=None):
     """Wrap data to support both list-like and string-like operations"""
     prefmt = pycompat.identity
     if fmt is None:
         fmt = '%s'
         prefmt = pycompat.bytestr
     return hybrid(gen, data, lambda x: {name: x}, lambda x: fmt % prefmt(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=None, 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=None,
                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 _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 stringify(thing):
     """Turn values into bytes by converting into text and concatenating them"""
     thing = unwraphybrid(thing)
     if util.safehasattr(thing, '__iter__') and not isinstance(thing, bytes):
         if isinstance(thing, str):
             # This is only reachable on Python 3 (otherwise
             # isinstance(thing, bytes) would have been true), and is
             # here to prevent infinite recursion bugs on Python 3.
             raise error.ProgrammingError(
                 'stringify got unexpected unicode string: %r' % thing)
         return "".join([stringify(t) for t in thing if t is not None])
     if thing is None:
         return ""
     return pycompat.bytestr(thing)
 
 def findsymbolicname(arg):
     """Find symbolic name for the given compiled expression; returns None
     if nothing found reliably"""
     while True:
         func, data = arg
         if func is runsymbol:
             return data
         elif func is runfilter:
             arg = data[0]
         else:
             return None
 
 def evalrawexp(context, mapping, arg):
     """Evaluate given argument as a bare template object which may require
     further processing (such as folding generator of strings)"""
     func, data = arg
     return func(context, mapping, data)
 
 def evalfuncarg(context, mapping, arg):
     """Evaluate given argument as value type"""
     thing = evalrawexp(context, mapping, arg)
     thing = unwrapvalue(thing)
     # evalrawexp() may return string, generator of strings or arbitrary object
     # such as date tuple, but filter does not want generator.
     if isinstance(thing, types.GeneratorType):
         thing = stringify(thing)
     return thing
 
 def evalboolean(context, mapping, arg):
     """Evaluate given argument as boolean, but also takes boolean literals"""
     func, data = arg
     if func is runsymbol:
         thing = func(context, mapping, data, default=None)
         if thing is None:
             # not a template keyword, takes as a boolean literal
             thing = util.parsebool(data)
     else:
         thing = func(context, mapping, data)
     thing = unwrapvalue(thing)
     if isinstance(thing, bool):
         return thing
     # other objects are evaluated as strings, which means 0 is True, but
     # empty dict/list should be False as they are expected to be ''
     return bool(stringify(thing))
 
 def evalinteger(context, mapping, arg, err=None):
     v = evalfuncarg(context, mapping, arg)
     try:
         return int(v)
     except (TypeError, ValueError):
         raise error.ParseError(err or _('not an integer'))
 
 def evalstring(context, mapping, arg):
     return stringify(evalrawexp(context, mapping, arg))
 
 def evalstringliteral(context, mapping, arg):
     """Evaluate given argument as string template, but returns symbol name
     if it is unknown"""
     func, data = arg
     if func is runsymbol:
         thing = func(context, mapping, data, default=data)
     else:
         thing = func(context, mapping, data)
     return stringify(thing)
 
 _evalfuncbytype = {
     bool: evalboolean,
     bytes: evalstring,
     int: evalinteger,
 }
 
 def evalastype(context, mapping, arg, typ):
     """Evaluate given argument and coerce its type"""
     try:
         f = _evalfuncbytype[typ]
     except KeyError:
         raise error.ProgrammingError('invalid type specified: %r' % typ)
     return f(context, mapping, arg)
 
 def runinteger(context, mapping, data):
     return int(data)
 
 def runstring(context, mapping, data):
     return data
 
 def _recursivesymbolblocker(key):
     def showrecursion(**args):
         raise error.Abort(_("recursive reference '%s' in template") % key)
     return showrecursion
 
 def runsymbol(context, mapping, key, default=''):
     v = context.symbol(mapping, key)
     if v is None:
         # put poison to cut recursion. we can't move this to parsing phase
         # because "x = {x}" is allowed if "x" is a keyword. (issue4758)
         safemapping = mapping.copy()
         safemapping[key] = _recursivesymbolblocker(key)
         try:
             v = context.process(key, safemapping)
         except TemplateNotFound:
             v = default
     if callable(v) and getattr(v, '_requires', None) is None:
         # old templatekw: expand all keywords and resources
-        props = context._resources.copy()
+        props = {k: f(context, mapping, k)
+                 for k, f in context._resources.items()}
         props.update(mapping)
         return v(**pycompat.strkwargs(props))
     if callable(v):
         # new templatekw
         try:
             return v(context, mapping)
         except ResourceUnavailable:
             # unsupported keyword is mapped to empty just like unknown keyword
             return None
     return v
 
 def runtemplate(context, mapping, template):
     for arg in template:
         yield evalrawexp(context, mapping, arg)
 
 def runfilter(context, mapping, data):
     arg, filt = data
     thing = evalfuncarg(context, mapping, arg)
     try:
         return filt(thing)
     except (ValueError, AttributeError, TypeError):
         sym = findsymbolicname(arg)
         if sym:
             msg = (_("template filter '%s' is not compatible with keyword '%s'")
                    % (pycompat.sysbytes(filt.__name__), sym))
         else:
             msg = (_("incompatible use of template filter '%s'")
                    % pycompat.sysbytes(filt.__name__))
         raise error.Abort(msg)
 
 def runmap(context, mapping, data):
     darg, targ = data
     d = evalrawexp(context, mapping, darg)
     if util.safehasattr(d, 'itermaps'):
         diter = d.itermaps()
     else:
         try:
             diter = iter(d)
         except TypeError:
             sym = findsymbolicname(darg)
             if sym:
                 raise error.ParseError(_("keyword '%s' is not iterable") % sym)
             else:
                 raise error.ParseError(_("%r is not iterable") % d)
 
     for i, v in enumerate(diter):
         lm = mapping.copy()
         lm['index'] = i
         if isinstance(v, dict):
             lm.update(v)
             lm['originalnode'] = mapping.get('node')
             yield evalrawexp(context, lm, targ)
         else:
             # v is not an iterable of dicts, this happen when 'key'
             # has been fully expanded already and format is useless.
             # If so, return the expanded value.
             yield v
 
 def runmember(context, mapping, data):
     darg, memb = data
     d = evalrawexp(context, mapping, darg)
     if util.safehasattr(d, 'tomap'):
         lm = mapping.copy()
         lm.update(d.tomap())
         return runsymbol(context, lm, memb)
     if util.safehasattr(d, 'get'):
         return getdictitem(d, memb)
 
     sym = findsymbolicname(darg)
     if sym:
         raise error.ParseError(_("keyword '%s' has no member") % sym)
     else:
         raise error.ParseError(_("%r has no member") % pycompat.bytestr(d))
 
 def runnegate(context, mapping, data):
     data = evalinteger(context, mapping, data,
                        _('negation needs an integer argument'))
     return -data
 
 def runarithmetic(context, mapping, data):
     func, left, right = data
     left = evalinteger(context, mapping, left,
                        _('arithmetic only defined on integers'))
     right = evalinteger(context, mapping, right,
                         _('arithmetic only defined on integers'))
     try:
         return func(left, right)
     except ZeroDivisionError:
         raise error.Abort(_('division by zero is not defined'))
 
 def getdictitem(dictarg, key):
     val = dictarg.get(key)
     if val is None:
         return
     return wraphybridvalue(dictarg, key, val)