push: provide a hint when no paths in configured (issue3692)

push: provide a hint when no paths in configured (issue3692)

When user type "hg push" command then this patch helps user by
providing hint if no default path is configured.

Second patch is the test coverage, to test the change behaviour of
first patch.

--- a/mercurial/commands.py	Mon Feb 24 22:42:14 2014 +0100
+++ b/mercurial/commands.py	Tue Feb 25 04:11:11 2014 +0530
@@ -4620,7 +4620,15 @@
     dest, branches = hg.parseurl(dest, opts.get('branch'))
     ui.status(_('pushing to %s\n') % util.hidepassword(dest))
     revs, checkout = hg.addbranchrevs(repo, repo, branches, opts.get('rev'))
-    other = hg.peer(repo, opts, dest)
+    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
+
     if revs:
         revs = [repo.lookup(r) for r in scmutil.revrange(repo, revs)]
 

--- a/tests/test-default-push.t	Mon Feb 24 22:42:14 2014 +0100
+++ b/tests/test-default-push.t	Tue Feb 25 04:11:11 2014 +0530
@@ -15,6 +15,16 @@
   $ echo b >> b/a
   $ hg --cwd b ci -mb
 
+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]
+
+  $ cd ..
+
 Push should push to 'default' when 'default-push' not set:
 
   $ hg --cwd b push