[PATCH 4 of 5] revset: replace revset.extpredicate by registrar.revsetpredicate

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1451994204 -32400
#      Tue Jan 05 20:43:24 2016 +0900
# Node ID 604903e68756b80dd147f37cc642c019b8d5e50b
# Parent  c6554052f10db3a9312b17c658bf8c579198a5d2
revset: replace revset.extpredicate by registrar.revsetpredicate

This patch consists of changes below (these can't be applied
separately).

  - replace 'revset.extpredicate' by 'registrar.revsetpredicate' in
    extensions

  - remove 'setup()' on an instance named as 'revsetpredicate' in
    'uisetup()'/'extsetup()' of each extensions

    'registrar.revsetpredicate' doesn't have 'setup()' API.

  - put new entry for 'revsetpredicate' into 'extraloaders' in
    dispatch

    This causes implicit loading predicate functions at loading
    extension.

    This loading mechanism requires that an extension has an instance
    named as 'revsetpredicate', and this is reason why
    largefiles/__init__.py is also changed in this patch.

Before this patch, test-revset.t tests that all decorated revset
predicates are loaded by 'setup()' at once ("all or nothing").

Now, test-revset.t tests that any revset predicate isn't loaded at
failure of loading extension, because loading itself is executed by
dispatch and it can't be controlled on extension side.

diff --git a/hgext/largefiles/__init__.py b/hgext/largefiles/__init__.py
--- a/hgext/largefiles/__init__.py
+++ b/hgext/largefiles/__init__.py
@@ -111,6 +111,7 @@ import lfcommands
 import proto
 import reposetup
 import uisetup as uisetupmod
+import overrides
 
 # Note for extension authors: ONLY specify testedwith = 'internal' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
@@ -130,3 +131,4 @@ def uisetup(ui):
     uisetupmod.uisetup(ui)
 
 cmdtable = lfcommands.cmdtable
+revsetpredicate = overrides.revsetpredicate
diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -12,7 +12,7 @@ import os
 import copy
 
 from mercurial import hg, util, cmdutil, scmutil, match as match_, \
-        archival, pathutil, revset, error
+        archival, pathutil, registrar, revset, error
 from mercurial.i18n import _
 
 import lfutil
@@ -812,7 +812,7 @@ def overridepull(orig, ui, repo, source=
         ui.status(_("%d largefiles cached\n") % numcached)
     return result
 
-revsetpredicate = revset.extpredicate()
+revsetpredicate = registrar.revsetpredicate()
 
 @revsetpredicate('pulled()')
 def pulledrevsetsymbol(repo, subset, x):
diff --git a/hgext/largefiles/uisetup.py b/hgext/largefiles/uisetup.py
--- a/hgext/largefiles/uisetup.py
+++ b/hgext/largefiles/uisetup.py
@@ -169,5 +169,3 @@ def uisetup(ui):
         if name == 'transplant':
             extensions.wrapcommand(getattr(module, 'cmdtable'), 'transplant',
                 overrides.overridetransplant)
-
-    overrides.revsetpredicate.setup()
diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -71,6 +71,7 @@ from mercurial import patch as patchmod
 from mercurial import lock as lockmod
 from mercurial import localrepo
 from mercurial import subrepo
+from mercurial import registrar
 import os, re, errno, shutil
 
 seriesopts = [('s', 'summary', None, _('print first line of patch header'))]
@@ -3558,7 +3559,7 @@ def summaryhook(ui, repo):
         # i18n: column positioning for "hg summary"
         ui.note(_("mq:     (empty queue)\n"))
 
-revsetpredicate = revset.extpredicate()
+revsetpredicate = registrar.revsetpredicate()
 
 @revsetpredicate('mq()')
 def revsetmq(repo, subset, x):
@@ -3598,8 +3599,6 @@ def extsetup(ui):
         if extmodule.__file__ != __file__:
             dotable(getattr(extmodule, 'cmdtable', {}))
 
-    revsetpredicate.setup()
-
 colortable = {'qguard.negative': 'red',
               'qguard.positive': 'yellow',
               'qguard.unguarded': 'green',
diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -16,7 +16,7 @@ https://mercurial-scm.org/wiki/RebaseExt
 
 from mercurial import hg, util, repair, merge, cmdutil, commands, bookmarks
 from mercurial import extensions, patch, scmutil, phases, obsolete, error
-from mercurial import copies, repoview, revset
+from mercurial import copies, repoview, registrar, revset
 from mercurial.commands import templateopts
 from mercurial.node import nullrev, nullid, hex, short
 from mercurial.lock import release
@@ -64,7 +64,7 @@ def _destrebase(repo):
     branch = repo[None].branch()
     return repo[branch].rev()
 
-revsetpredicate = revset.extpredicate()
+revsetpredicate = registrar.revsetpredicate()
 
 @revsetpredicate('_destrebase')
 def _revsetdestrebase(repo, subset, x):
@@ -1241,4 +1241,3 @@ def uisetup(ui):
          _("use 'hg rebase --continue' or 'hg rebase --abort'")])
     # ensure rebased rev are not hidden
     extensions.wrapfunction(repoview, '_getdynamicblockers', _rebasedvisible)
-    revsetpredicate.setup()
diff --git a/hgext/transplant.py b/hgext/transplant.py
--- a/hgext/transplant.py
+++ b/hgext/transplant.py
@@ -19,7 +19,7 @@ import os, tempfile
 from mercurial.node import short
 from mercurial import bundlerepo, hg, merge, match
 from mercurial import patch, revlog, scmutil, util, error, cmdutil
-from mercurial import revset, templatekw, exchange
+from mercurial import registrar, revset, templatekw, exchange
 from mercurial import lock as lockmod
 
 class TransplantError(error.Abort):
@@ -693,7 +693,7 @@ def _dotransplant(ui, repo, *revs, **opt
         if cleanupfn:
             cleanupfn()
 
-revsetpredicate = revset.extpredicate()
+revsetpredicate = registrar.revsetpredicate()
 
 @revsetpredicate('transplanted([set])')
 def revsettransplanted(repo, subset, x):
@@ -713,7 +713,6 @@ def kwtransplanted(repo, ctx, **args):
     return n and revlog.hex(n) or ''
 
 def extsetup(ui):
-    revsetpredicate.setup()
     templatekw.keywords['transplanted'] = kwtransplanted
     cmdutil.unfinishedstates.append(
         ['series', True, False, _('transplant in progress'),
diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -33,6 +33,7 @@ from . import (
     fancyopts,
     hg,
     hook,
+    revset,
     ui as uimod,
     util,
 )
@@ -765,6 +766,7 @@ def _loadcmdtable(ui, name, cmdtable):
 #   obj) arguments
 extraloaders = [
     ('cmdtable', None, None), # this is just a place holder for 'cmdtable'
+    ('revsetpredicate', revset, 'loadpredicate'),
 ]
 
 def _dispatch(req):
diff --git a/mercurial/registrar.py b/mercurial/registrar.py
--- a/mercurial/registrar.py
+++ b/mercurial/registrar.py
@@ -229,6 +229,12 @@ class revsetpredicate(funcregistrarbase)
 
     'revsetpredicate' instance in example above can be used to
     decorate multiple functions.
+
+    Decorated functions are registered automatically at loading
+    extension, if an instance named as 'revsetpredicate' is used for
+    decorating in extension.
+
+    Otherwise, explicit 'revset.loadpredicate()' is needed.
     """
     getname = funcregistrarbase.parsefuncdecl
     formatdoc = "``%s``\n    %s"
diff --git a/tests/test-revset.t b/tests/test-revset.t
--- a/tests/test-revset.t
+++ b/tests/test-revset.t
@@ -2190,28 +2190,21 @@ test error message of bad revset
 
   $ cd ..
 
-Test registrar.delayregistrar via revset.extpredicate
-
-'extpredicate' decorator shouldn't register any functions until
-'setup()' on it.
+Test that revset predicate of extension isn't loaded at failure of
+loading it
 
   $ cd repo
 
   $ cat <<EOF > $TESTTMP/custompredicate.py
-  > from mercurial import revset
+  > from mercurial import registrar, revset
   > 
-  > revsetpredicate = revset.extpredicate()
+  > revsetpredicate = registrar.revsetpredicate()
   > 
   > @revsetpredicate('custom1()')
   > def custom1(repo, subset, x):
   >     return revset.baseset([1])
-  > @revsetpredicate('custom2()')
-  > def custom2(repo, subset, x):
-  >     return revset.baseset([2])
   > 
-  > def uisetup(ui):
-  >     if ui.configbool('custompredicate', 'enabled'):
-  >         revsetpredicate.setup()
+  > syntax error for intentional failure of loading this module
   > EOF
   $ cat <<EOF > .hg/hgrc
   > [extensions]
@@ -2219,13 +2212,8 @@ Test registrar.delayregistrar via revset
   > EOF
 
   $ hg debugrevspec "custom1()"
+  *** failed to import extension custompredicate from $TESTTMP/custompredicate.py: invalid syntax (custompredicate.py, line 9)
   hg: parse error: unknown identifier: custom1
   [255]
-  $ hg debugrevspec "custom2()"
-  hg: parse error: unknown identifier: custom2
-  [255]
-  $ hg debugrevspec "custom1() or custom2()" --config custompredicate.enabled=true
-  1
-  2
 
   $ cd ..