rebase: add --confirm option This feature adds a functionality in rebase to confirm before applying changes. When there is no conflict and user confirm to apply actions, we just finish the unfinished rebase. But when there is a conflict and user confirm to apply actions then we can't just finish rebasing using rbsrt._finishrebase() because in-memory merge doesn't support conflicts, so we have to abort and run on-disk merge in this case. And if user doesn't confirm to apply actions then simply abort the rebase. Differential Revision: https://phab.mercurial-scm.org/D3870

--- a/mercurial/cmdutil.py	Wed Jul 11 16:29:23 2018 -0700
+++ b/mercurial/cmdutil.py	Sat Jun 30 12:42:49 2018 +0530
@@ -62,6 +62,11 @@
      _('do not perform actions, just print output')),
 ]
 
+confirmopts = [
+    ('', 'confirm', None,
+     _('ask before applying actions')),
+]
+
 remoteopts = [
     ('e', 'ssh', '',
      _('specify ssh command to use'), _('CMD')),