graft: add --dry-run support (issue3362)

graft: add --dry-run support (issue3362)

--- a/mercurial/commands.py	Fri Apr 06 16:18:33 2012 +0300
+++ b/mercurial/commands.py	Tue Apr 10 12:49:12 2012 -0500
@@ -2492,7 +2492,7 @@
       _('record the current date as commit date')),
      ('U', 'currentuser', False,
       _('record the current user as committer'), _('DATE'))]
-    + commitopts2 + mergetoolopts,
+    + commitopts2 + mergetoolopts  + dryrunopts,
     _('[OPTION]... REVISION...'))
 def graft(ui, repo, *revs, **opts):
     '''copy changes from other branches onto the current branch
@@ -2611,7 +2611,10 @@
 
     for pos, ctx in enumerate(repo.set("%ld", revs)):
         current = repo['.']
+
         ui.status(_('grafting revision %s\n') % ctx.rev())
+        if opts.get('dry_run'):
+            continue
 
         # we don't merge the first commit when continuing
         if not cont:
@@ -2654,7 +2657,7 @@
                     date=date, extra=extra, editor=editor)
 
     # remove state when we complete successfully
-    if os.path.exists(repo.join('graftstate')):
+    if not opts.get('dry_run') and os.path.exists(repo.join('graftstate')):
         util.unlinkpath(repo.join('graftstate'))
 
     return 0

--- a/tests/test-debugcomplete.t	Fri Apr 06 16:18:33 2012 +0300
+++ b/tests/test-debugcomplete.t	Tue Apr 10 12:49:12 2012 -0500
@@ -247,7 +247,7 @@
   debugsub: rev
   debugwalk: include, exclude
   debugwireargs: three, four, five, ssh, remotecmd, insecure
-  graft: continue, edit, currentdate, currentuser, date, user, tool
+  graft: continue, edit, currentdate, currentuser, date, user, tool, dry-run
   grep: print0, all, text, follow, ignore-case, files-with-matches, line-number, rev, user, date, include, exclude
   heads: rev, topo, active, closed, style, template
   help: extension, command

--- a/tests/test-graft.t	Fri Apr 06 16:18:33 2012 +0300
+++ b/tests/test-graft.t	Tue Apr 10 12:49:12 2012 -0500
@@ -107,6 +107,14 @@
 
 Graft out of order, skipping a merge and a duplicate
 
+  $ hg graft 1 5 4 3 'merge()' 2 -n
+  skipping ungraftable merge revision 6
+  skipping already grafted revision 2
+  grafting revision 1
+  grafting revision 5
+  grafting revision 4
+  grafting revision 3
+
   $ hg graft 1 5 4 3 'merge()' 2 --debug
   skipping ungraftable merge revision 6
   scanning for duplicate grafts