til_settings: add an optional til_settings_t.prefix

Preparatory commit for bridging the gap separating a baked
til_setup_t from a runtime-populated descendant til_settings_t
like modules::rtv produces for its channels via
til_module_setup_randomize().

For these currently orphaned til_settings_t instances we don't
readily have access to the logical ancestor til_settings_t that
was used to produce the module_context's bound til_setup_t.  But
we don't really need the ancestor til_settings_t, all we _really_
want is the ancestral path to prefix the orphan til_settings_t
instances.

So this commit introduces supplying a prefix which gets prepended
to paths printed via the settings instance.  A later commit will
make use of this in modules::rtv when producing the settings
instance passed to til_module_setup_randomize()

1 files changed, 2 insertions, 2 deletions

diff --git a/src/main.c b/src/main.c
index 25ae4cd..240dab1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -221,11 +221,11 @@ static int setup_from_args(til_args_t *args, setup_t *res_setup, const til_setti
 	 */
 	srand(setup.seed);
 
-	setup.module_settings = til_settings_new(NULL, "module", args->module);
+	setup.module_settings = til_settings_new(NULL, NULL, "module", args->module);
 	if (!setup.module_settings)
 		goto _err;
 
-	setup.video_settings = til_settings_new(NULL, "video", args->video);
+	setup.video_settings = til_settings_new(NULL, NULL, "video", args->video);
 	if (!setup.video_settings)
 		goto _err;