rebase: move constant expressions out of inner loop in _performrebase()

Differential Revision: https://phab.mercurial-scm.org/D2811

hgext/rebase.py

@@ -423,26 +423,24 b' class rebaseruntime(object):'
 
         cands = [k for k, v in self.state.iteritems() if v == revtodo]
         total = len(cands)
-        pos = 0
+        posholder = [0]
+        def progress(ctx):
+            posholder[0] += 1
+            self.repo.ui.progress(_("rebasing"), posholder[0],
+                                  ("%d:%s" % (ctx.rev(), ctx)),
+                                  _('changesets'), total)
+        allowdivergence = self.ui.configbool(
+            'experimental', 'evolution.allowdivergence')
         for subset in sortsource(self.destmap):
             sortedrevs = self.repo.revs('sort(%ld, -topo)', subset)
-            allowdivergence = self.ui.configbool(
-                'experimental', 'evolution.allowdivergence')
             if not allowdivergence:
                 sortedrevs -= self.repo.revs(
                     'descendants(%ld) and not %ld',
                     self.obsoletewithoutsuccessorindestination,
                     self.obsoletewithoutsuccessorindestination,
                 )
-            posholder = [pos]
-            def progress(ctx):
-                posholder[0] += 1
-                self.repo.ui.progress(_("rebasing"), posholder[0],
-                                      ("%d:%s" % (ctx.rev(), ctx)),
-                                      _('changesets'), total)
             for rev in sortedrevs:
                 self._rebasenode(tr, rev, allowdivergence, progress)
-            pos = posholder[0]
         ui.progress(_('rebasing'), None)
         ui.note(_('rebase merging completed\n'))