# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1404138435 14400
# Node ID debf44fa91a2000c49f54b4d3e9a2667c5fc1aec
# Parent  8a4a8fe50c2650e3fff4797d5b4163eebeb1e687
fold: clarify message for empty revision set and abort instead (BC)

I find it clearer that there are no revisions to fold because none
were specified. Otherwise it seems ambiguous: maybe there are no
revisions to fold because it's impossible to fold whatever was given?
In analogy of other commands that are given no revisions (e.g. strip,
graft), this is also now an abort instead of a mere error message,
which is a BC.

diff -r 8a4a8fe50c26 -r debf44fa91a2 hgext/evolve.py
--- a/hgext/evolve.py	Fri Jul 04 09:29:13 2014 -0400
+++ b/hgext/evolve.py	Mon Jun 30 10:27:15 2014 -0400
@@ -2098,8 +2098,7 @@
     else:
         revs = ()
     if not revs:
-        ui.write_err('no revision to fold\n')
-        return 1
+        raise util.Abort(_('no revisions specified'))
     roots = repo.revs('roots(%ld)', revs)
     if len(roots) > 1:
         raise util.Abort("set has multiple roots")
diff -r 8a4a8fe50c26 -r debf44fa91a2 tests/test-evolve.t
--- a/tests/test-evolve.t	Fri Jul 04 09:29:13 2014 -0400
+++ b/tests/test-evolve.t	Mon Jun 30 10:27:15 2014 -0400
@@ -614,8 +614,8 @@
 
   $ rm *.orig
   $ hg fold
-  no revision to fold
-  [1]
+  abort: no revisions specified
+  [255]
   $ hg fold 6 --rev 10
   abort: cannot specify both --rev and a target revision
   [255]