outgoing: respect ":pushurl" paths (issue5365)

Make 'hg outgoing' respect "paths.default:pushurl" in addition to
"paths.default-push".

'hg outgoing' has always meant "what will happen if I run 'hg push'?" and it's
still documented that way:

    Show changesets not found in the specified destination repository or the
    default push location. These are the changesets that would be pushed if a
    push was requested.

If the user uses the now-deprecated "paths.default-push" path, it continues to
work that way. However, as described at
https://bz.mercurial-scm.org/show_bug.cgi?id=5365, it doesn't behave the same
with "paths.default:pushurl".

Why does it matter? Similar to the bugzilla reporter, I have a read-only mirror
of a non-Mercurial repository:

  upstream -> imported mirror -> user clone
         ^-----------------------/

Users push directly to upstream, and that content is then imported into the
mirror. However, those repositories are not the same; it's possible that the
mirroring has either broken completely, or an import process is running and not
yet complete. In those cases, 'hg outgoing' will list changesets that have
already been pushed.

Mozilla's desired behavior described in bug 5365 can be accomplished through
other means (e.g. 'hg outgoing default'), preserving the consistency and
meaning of 'hg outgoing'.

mercurial/hg.py

@@ -916,8 +916,13 b' def incoming(ui, repo, source, opts):'
     return _incoming(display, subreporecurse, ui, repo, source, opts)
 
 def _outgoing(ui, repo, dest, opts):
-    dest = ui.expandpath(dest or 'default-push', dest or 'default')
-    dest, branches = parseurl(dest, opts.get('branch'))
+    path = ui.paths.getpath(dest, default=('default-push', 'default'))
+    if not path:
+        raise error.Abort(_('default repository not configured!'),
+                hint=_("see 'hg help config.paths'"))
+    dest = path.pushloc or path.loc
+    branches = path.branch, opts.get('branch') or []
+
     ui.status(_('comparing with %s\n') % util.hidepassword(dest))
     revs, checkout = addbranchrevs(repo, repo, branches, opts.get('rev'))
     if revs:

mercurial/revset.py

@@ -1418,8 +1418,16 b' def outgoing(repo, subset, x):'
     l = getargs(x, 0, 1, _("outgoing takes one or no arguments"))
     # i18n: "outgoing" is a keyword
     dest = l and getstring(l[0], _("outgoing requires a repository path")) or ''
-    dest = repo.ui.expandpath(dest or 'default-push', dest or 'default')
-    dest, branches = hg.parseurl(dest)
+    if not dest:
+        # ui.paths.getpath() explicitly tests for None, not just a boolean
+        dest = None
+    path = repo.ui.paths.getpath(dest, default=('default-push', 'default'))
+    if not path:
+        raise error.Abort(_('default repository not configured!'),
+                hint=_("see 'hg help config.paths'"))
+    dest = path.pushloc or path.loc
+    branches = path.branch, []
+
     revs, checkout = hg.addbranchrevs(repo, repo, branches, [])
     if revs:
         revs = [repo.lookup(rev) for rev in revs]

tests/test-incoming-outgoing.t

@@ -491,3 +491,63 b' incoming from empty remote repository'
   searching for changes
   no changes found
   [1]
+
+Create a "split" repo that pulls from r1 and pushes to r2, using default-push
+
+  $ hg clone r1 split
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cat > split/.hg/hgrc << EOF
+  > [paths]
+  > default = $TESTTMP/r3
+  > default-push = $TESTTMP/r2
+  > EOF
+  $ hg -R split outgoing
+  comparing with $TESTTMP/r2
+  searching for changes
+  changeset:   0:3e92d79f743a
+  tag:         tip
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     a
+  
+
+Use default:pushurl instead of default-push
+
+Windows needs a leading slash to make a URL that passes all of the checks
+  $ WD=`pwd`
+#if windows
+  $ WD="/$WD"
+#endif
+  $ cat > split/.hg/hgrc << EOF
+  > [paths]
+  > default = $WD/r3
+  > default:pushurl = file://$WD/r2
+  > EOF
+  $ hg -R split outgoing
+  comparing with file:/*/$TESTTMP/r2 (glob)
+  searching for changes
+  changeset:   0:3e92d79f743a
+  tag:         tip
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     a
+  
+
+Push and then double-check outgoing
+
+  $ echo a >> split/foo
+  $ hg -R split commit -Ama
+  $ hg -R split push
+  pushing to file:/*/$TESTTMP/r2 (glob)
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 1 files
+  $ hg -R split outgoing
+  comparing with file:/*/$TESTTMP/r2 (glob)
+  searching for changes
+  no changes found
+  [1]
+

tests/test-revset-outgoing.t

@@ -105,12 +105,11 b''
   green = ../a#default
 
   $ hg tout green
-  comparing with green
-  abort: repository green not found!
+  abort: repository green does not exist!
   [255]
 
   $ hg tlog -r 'outgoing("green")'
-  abort: repository green not found!
+  abort: repository green does not exist!
   [255]
 
   $ cd ..