From 4b075bb0750754f219704b99486605ee81634c7b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 6 Feb 2024 13:55:30 +0100
Subject: [PATCH] osc: 176 (app-id): implement query+reply

Applications can now query for the current app-id with:

    \E] 176 ; ? \E\\

The reply is

    \E] 176 ; <title> \E\\
---
 osc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/osc.c b/osc.c
index 28e93e51..06cc7db6 100644
--- a/osc.c
+++ b/osc.c
@@ -917,6 +917,18 @@ osc_dispatch(struct terminal *term)
         break;
 
     case 176:
+        if (string[0] == '?' && string[1] == '\0') {
+            const char *terminator = term->vt.osc.bel ? "\a" : "\033\\";
+            char *reply = xasprintf(
+                "\033]176;%s%s",
+                term->app_id != NULL ? term->app_id : term->conf->app_id,
+                terminator);
+
+            term_to_slave(term, reply, strlen(reply));
+            free(reply);
+            break;
+        }
+
         term_set_app_id(term, string);
         break;