From: David Kastrup <dak@gnu.org>
Date: Mon, 18 May 2015 17:33:06 +0000 (+0200)
Subject: Issue 4404: Add ly:disconnect-dispatchers function
X-Git-Tag: release/2.19.22-1~68^2~35
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=04c5cece95672044388052de186b21674f4bb0dc;p=lilypond.git

Issue 4404: Add ly:disconnect-dispatchers function
---

diff --git a/lily/dispatcher-scheme.cc b/lily/dispatcher-scheme.cc
index 44d9b792a3..3fd4decc42 100644
--- a/lily/dispatcher-scheme.cc
+++ b/lily/dispatcher-scheme.cc
@@ -41,6 +41,21 @@ LY_DEFINE (ly_connect_dispatchers, "ly:connect-dispatchers",
   return SCM_UNSPECIFIED;
 }
 
+LY_DEFINE (ly_disconnect_dispatchers, "ly:disconnect-dispatchers",
+           2, 0, 0, (SCM to, SCM from),
+           "Stop the dispatcher @var{to} listening to events from @var{from}.")
+{
+  Dispatcher *t = unsmob<Dispatcher> (to);
+  Dispatcher *f = unsmob<Dispatcher> (from);
+
+  LY_ASSERT_SMOB (Dispatcher, to, 1);
+  LY_ASSERT_SMOB (Dispatcher, from, 2);
+
+  t->unregister_as_listener (f);
+
+  return SCM_UNSPECIFIED;
+}
+
 LY_DEFINE (ly_add_listener, "ly:add-listener",
            2, 0, 1, (SCM callback, SCM disp, SCM cl),
            "Add the single-argument procedure @var{callback} as listener"