narrowtemplates: update to use registrar mechanism

It's worth considering at this point if we should just move the two
ellipsis functions to core tagged experimental or something, since
they're not really narrowing-specific...

Differential Revision: https://phab.mercurial-scm.org/D2009

hgext/narrow/__init__.py

@@ -62,7 +62,6 b' def uisetup(ui):'
     narrowrevlog.setup()
     narrowbundle2.setup()
     narrowmerge.setup()
-    narrowtemplates.setup()
     narrowcommands.setup()
     narrowchangegroup.setup()
     narrowwirepeer.uisetup()
@@ -91,3 +90,6 b' def extsetup(ui):'
     extensions.wrapfunction(verifymod.verifier, '__init__', _verifierinit)
     extensions.wrapfunction(hg, 'postshare', narrowrepo.wrappostshare)
     extensions.wrapfunction(hg, 'copystore', narrowrepo.unsharenarrowspec)
+
+templatekeyword = narrowtemplates.templatekeyword
+revsetpredicate = narrowtemplates.revsetpredicate

hgext/narrow/narrowtemplates.py

@@ -8,17 +8,21 b''
 from __future__ import absolute_import
 
 from mercurial import (
+    registrar,
     revlog,
-    revset,
-    templatekw,
     util,
 )
 
+keywords = {}
+templatekeyword = registrar.templatekeyword(keywords)
+revsetpredicate = registrar.revsetpredicate()
+
 def _isellipsis(repo, rev):
     if repo.changelog.flags(rev) & revlog.REVIDX_ELLIPSIS:
         return True
     return False
 
+@templatekeyword('ellipsis')
 def ellipsis(repo, ctx, templ, **args):
     """:ellipsis: String. 'ellipsis' if the change is an ellipsis node,
     else ''."""
@@ -26,6 +30,7 b' def ellipsis(repo, ctx, templ, **args):'
         return 'ellipsis'
     return ''
 
+@templatekeyword('outsidenarrow')
 def outsidenarrow(repo, ctx, templ, **args):
     """:outsidenarrow: String. 'outsidenarrow' if the change affects no
     tracked files, else ''."""
@@ -35,15 +40,9 b' def outsidenarrow(repo, ctx, templ, **ar'
             return 'outsidenarrow'
     return ''
 
+@revsetpredicate('ellipsis')
 def ellipsisrevset(repo, subset, x):
     """``ellipsis()``
     Changesets that are ellipsis nodes.
     """
     return subset.filter(lambda r: _isellipsis(repo, r))
-
-def setup():
-    templatekw.keywords['ellipsis'] = ellipsis
-    templatekw.keywords['outsidenarrow'] = outsidenarrow
-
-    revset.symbols['ellipsis'] = ellipsisrevset
-    revset.safesymbols.add('ellipsis')