[LAU] Toggle Jack Transport CLI

[holger at dehnhardt.org]

Hi lista :)

	Using an i3 (https://i3wm.org/docs/userguide.html#exec) shortcut, I can control my jack transport from everywhere, even when no jack application has focus :

	bindsym $mod+p exec echo play | jack_transport
bindsym $mod+Shift+p exec echo stop | jack_transport

	Thanks to FalkTX for the pipe trick BTW, I saw that on linuxmusicians ; This is very cool if you have some sort of wireless keyboard, but as you can see it's two different keystrokes, how do I make it so  toggles play/pause? Alternatively, how do I know when jack transport is rolling, so I can hack my way into making my own toggle script? I did my homework and read the inline --help of all the available jack commands on my machine :
With this patch, jack_transport should be able to toggle. I will suggest it to the jack-develop list but would be happy if some else can test it.
Holger

-----------------

diff --git a/example-clients/transport.c b/example-clients/transport.c
index c543b41..0b1130f 100644
--- a/example-clients/transport.c
+++ b/example-clients/transport.c
@@ -211,6 +211,29 @@ static void com_timeout(char *arg)
 jack_set_sync_timeout(client, (jack_time_t) (timeout*1000000));
}
+/* Set sync timeout in seconds. */
+static void com_toggle(char *arg)
+{ 
+ jack_position_t current;
+ jack_transport_state_t transport_state;
+
+ transport_state = jack_transport_query (client, ¤t);
+
+ switch (transport_state) {
+ case JackTransportStopped:
+ com_play( arg );
+ break;
+ case JackTransportRolling:
+ com_stop( arg );
+ break;
+ case JackTransportStarting:
+ printf ("state: Starting - no transport toggling");
+ break;
+ default:
+ printf ("state: Unknown - no transport toggling");
+ } 
+}
+
/* Command parsing based on GNU readline info examples. */
@@ -238,6 +261,7 @@ command_t commands[] = {
 {"stop", com_stop, "Stop transport"},
 {"tempo", com_tempo, "Set beat tempo "},
 {"timeout", com_timeout, "Set sync timeout in "},
+ {"toggle", com_toggle, "Toggle transport rolling"},
 {"?", com_help, "Synonym for `help'" },
 {(char *)NULL, (cmd_function_t *)NULL, (char *)NULL }
};
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