From: David Kastrup <dak@gnu.org>
Date: Sat, 4 Feb 2012 15:37:05 +0000 (+0100)
Subject: Give ly:option-usage an optional port argument (issue 2280).
X-Git-Tag: release/2.15.29-1~29
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=c20ff11378676b24f01be82f5cfbb022a0bfaab1;p=lilypond.git

Give ly:option-usage an optional port argument (issue 2280).
---

diff --git a/lily/program-option-scheme.cc b/lily/program-option-scheme.cc
index cf5416ae8b..820faf5bfe 100644
--- a/lily/program-option-scheme.cc
+++ b/lily/program-option-scheme.cc
@@ -187,12 +187,12 @@ get_help_string ()
   return help;
 }
 
-LY_DEFINE (ly_option_usage, "ly:option-usage", 0, 0, 0, (),
-           "Print @code{ly:set-option} usage.")
+LY_DEFINE (ly_option_usage, "ly:option-usage", 0, 1, 0, (SCM port),
+           "Print @code{ly:set-option} usage.  Optional @var{port} argument"
+	   "for the destination defaults to current output port.")
 {
-  string help = get_help_string ();
-  puts (help.c_str ());
-  fflush (stdout);
+  SCM str = scm_from_locale_string (get_help_string ().c_str ());
+  scm_write_line (str, port);
 
   return SCM_UNSPECIFIED;
 }