Rather than running status-left, status-right and window title #() with popen

immediately every redraw, queue them up and run them in the background,
starting each once every status-interval. The actual status line uses the
output from the last run.

This brings several advantages:

- tmux itself may be called from inside #() without causing the server to hang;
- likewise, sleep or similar doesn't cause the server to block;
- commands aren't run excessively often when redrawing;
- commands shared by status-left and status-right, or used multiple times, will
  only be run once.

run-shell and if-shell still use system()/popen() but will be changed over to
use this too later.

1 files changed, 4 insertions, 1 deletions

diff --git a/cmd-set-option.c b/cmd-set-option.c
index 2a3b2877..a495a15d 100644
--- a/cmd-set-option.c
+++ b/cmd-set-option.c
@@ -186,8 +186,11 @@ cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 	recalculate_sizes();
 	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
 		c = ARRAY_ITEM(&clients, i);
-		if (c != NULL && c->session != NULL)
+		if (c != NULL && c->session != NULL) {
+			job_tree_free(&c->status_jobs);
+			job_tree_init(&c->status_jobs);
 			server_redraw_client(c);
+		}
 	}
 
 	return (0);