uncommit: enable support for adding a note

This comes from the evolve extension's version of uncommit.  The logic was
already in place, and appears to be the last of the trivial things that can be
enabled.

Should these note options (including on amend) be marked advanced to keep the
help text clutter level down?

Differential Revision: https://phab.mercurial-scm.org/D6857

hgext/uncommit.py

@@ -111,7 +111,8 b' def _commitfiltered(repo, ctx, match, ke'
 @command('uncommit',
     [('', 'keep', None, _('allow an empty commit after uncommiting')),
      ('', 'allow-dirty-working-copy', False,
-    _('allow uncommit with outstanding changes'))
+    _('allow uncommit with outstanding changes')),
+     (b'n', b'note', b'', _(b'store a note on uncommit'), _(b'TEXT'))
     ] + commands.walkopts + commands.commitopts + commands.commitopts2
     + commands.commitopts3,
     _('[OPTION]... [FILE]...'),
@@ -129,6 +130,7 b' def uncommit(ui, repo, *pats, **opts):'
     """
     opts = pycompat.byteskwargs(opts)
 
+    cmdutil.checknotesize(ui, opts)
     cmdutil.resolvecommitoptions(ui, opts)
 
     with repo.wlock(), repo.lock():

tests/test-uncommit.t

@@ -36,6 +36,7 b' Help for uncommit'
   
       --keep                     allow an empty commit after uncommiting
       --allow-dirty-working-copy allow uncommit with outstanding changes
+   -n --note TEXT                store a note on uncommit
    -I --include PATTERN [+]      include names matching the given patterns
    -X --exclude PATTERN [+]      exclude names matching the given patterns
    -m --message TEXT             use text as commit message
@@ -570,7 +571,7 b' Bad option combinations'
 
   $ hg rollback -q --config ui.rollback=True
   $ cd dir
-  $ hg uncommit .
+  $ hg uncommit . -n 'this is a note'
   note: keeping empty commit
   $ hg status
   A dir/file2.txt