commands.push: use paths API

ui.path instances now collect most of the data used by commands.push().
Move away from ui.expandpath() and call ui.paths.getpath() to get a
path instance.

Some "pushing to" output was dropped as one test demonstrates. I believe
the dropped message was redundant with the error message and the change
to be acceptable.

mercurial/commands.py

@@ -5274,18 +5274,14 b' def push(ui, repo, dest=None, **opts):'
                 # this lets simultaneous -r, -b options continue working
                 opts.setdefault('rev', []).append("null")
 
-    dest = ui.expandpath(dest or 'default-push', dest or 'default')
-    dest, branches = hg.parseurl(dest, opts.get('branch'))
+    path = ui.paths.getpath(dest or 'default-push', default='default')
+    if not path:
+        raise util.Abort(_('default repository not configured!'),
+                         hint=_('see the "path" section in "hg help config"'))
+    dest, branches = path.loc, (path.branch, opts.get('branch') or [])
     ui.status(_('pushing to %s\n') % util.hidepassword(dest))
     revs, checkout = hg.addbranchrevs(repo, repo, branches, opts.get('rev'))
-    try:
-        other = hg.peer(repo, opts, dest)
-    except error.RepoError:
-        if dest == "default-push":
-            raise util.Abort(_("default repository not configured!"),
-                    hint=_('see the "path" section in "hg help config"'))
-        else:
-            raise
+    other = hg.peer(repo, opts, dest)
 
     if revs:
         revs = [repo.lookup(r) for r in scmutil.revrange(repo, revs)]

tests/test-default-push.t

@@ -18,7 +18,6 b''
 Push should provide a hint when both 'default' and 'default-push' not set:
   $ cd c
   $ hg push --config paths.default=
-  pushing to default-push
   abort: default repository not configured!
   (see the "path" section in "hg help config")
   [255]