Mention FILE or FOLDER arg to -o command-line option. (issue 343510043 by address@hidden)

[v . villenave]

Reviewers: ,

Message:
Pushed as
https://git.savannah.gnu.org/cgit/lilypond.git/commit/?id=3aeb41c27fa9db60eb6faa7c0c8532614697d06c

Description:
Mention FILE or FOLDER arg to -o command-line option.

As Federico explained in issue #5288, this is mentioned
in the Usage manual, but not in the man page/command-line help.

Please review this at https://codereview.appspot.com/343510043/

Affected files (+3, -1 lines):
  M lily/main.cc


Index: lily/main.cc
diff --git a/lily/main.cc b/lily/main.cc
index  
b3a487d63a4c4bb95366010bac6e84062c665a09..9b8bea9269403e1fde1a140fab54def547049f0d  
100644
--- a/lily/main.cc
+++ b/lily/main.cc
@@ -183,7 +183,9 @@ static Long_option_init options_static[]
            "which is either NONE, ERROR, WARNING,\n"
            "BASIC, PROGRESS, INFO (default), or DEBUG")},
   {_i ("FILE"), "output", 'o',
-     _i ("write output to FILE (suffix will be added)")},
+     _i ("write output to FILE (suffix will be added)\n"
+          "or to FOLDER, in which case the file name will\n"
+          "be taken from the input file.")},
   {0, "relocate", 0,
      _i ("(ignored)")},
   {0, "silent", 's',