shelve: accept '--edit' like other commands creating new changeset

After this patch, users can invoke editor for the commit message by
'--edit' option regardless of '--message'.

hgext/shelve.py

@@ -178,7 +178,8 b' def createcmd(ui, repo, pats, opts):'
         if hasmq:
             saved, repo.mq.checkapplied = repo.mq.checkapplied, False
         try:
-            return repo.commit(message, user, opts.get('date'), match)
+            return repo.commit(message, user, opts.get('date'), match,
+                               editor=cmdutil.getcommiteditor(**opts))
         finally:
             if hasmq:
                 repo.mq.checkapplied = saved
@@ -635,6 +636,8 b' def unshelve(ui, repo, *shelved, **opts)'
            _('shelve with the specified commit date'), _('DATE')),
           ('d', 'delete', None,
            _('delete the named shelved change(s)')),
+          ('e', 'edit', False,
+           _('invoke editor on commit messages')),
           ('l', 'list', None,
            _('list current shelves')),
           ('m', 'message', '',
@@ -680,6 +683,7 b' def shelvecmd(ui, repo, *pats, **opts):'
         ('cleanup', 'cleanup'),
 #       ('date', 'create'), # ignored for passing '--date "0 0"' in tests
         ('delete', 'delete'),
+        ('edit', 'create'),
         ('list', 'list'),
         ('message', 'create'),
         ('name', 'create'),

tests/test-shelve.t

@@ -16,8 +16,10 b''
   $ hg addremove -q
 
 shelving in an empty repo should be possible
+(this tests also that editor is not invoked, if '--edit' is not
+specified)
 
-  $ hg shelve
+  $ HGEDITOR=cat hg shelve
   shelved as default
   0 files updated, 0 files merged, 5 files removed, 0 files unresolved
 
@@ -132,6 +134,7 b' apply it and make sure our state is as e'
   [255]
 
 named shelves, specific filenames, and "commit messages" should all work
+(this tests also that editor is invoked, if '--edit' is specified)
 
   $ hg status -C
   M a/a
@@ -140,7 +143,16 b' named shelves, specific filenames, and "'
   A c.copy
     c
   R b/b
-  $ hg shelve -q -n wibble -m wat a
+  $ HGEDITOR=cat hg shelve -q -n wibble -m wat -e a
+  wat
+  
+  
+  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
+  HG: Leave message empty to abort commit.
+  HG: --
+  HG: user: shelve@localhost
+  HG: branch 'default'
+  HG: changed a/a
 
 expect "a" to no longer be present, but status otherwise unchanged