randr: Register monitors' output names as additional i3 output names

In addition to the name of the monitor itself (which is still used as
the i3 output's primary name), register RandR output names associated
with the RandR monitor as alternative i3 output names.

diff --git a/src/randr.c b/src/randr.c
index df63826d57ad9fb0ad602ebdfcb523c65d25de7c..92d652b7b18eab1d5ec775bfff4853999978aa02 100644 (file)
--- a/src/randr.c
+++ b/src/randr.c
@@ -599,9 +599,39 @@ static bool randr_query_outputs_15(void) {
         if (new == NULL) {
             new = scalloc(1, sizeof(Output));
 
+            SLIST_INIT(&new->names_head);
+
+            /* Register associated output names in addition to the monitor name */
+            xcb_randr_output_t *randr_outputs = xcb_randr_monitor_info_outputs(monitor_info);
+            int randr_output_len = xcb_randr_monitor_info_outputs_length(monitor_info);
+            for (int i = 0; i < randr_output_len; i++) {
+                xcb_randr_output_t randr_output = randr_outputs[i];
+
+                xcb_randr_get_output_info_reply_t *info =
+                    xcb_randr_get_output_info_reply(conn,
+                                                    xcb_randr_get_output_info(conn, randr_output, monitors->timestamp),
+                                                    NULL);
+
+                if (info != NULL && info->crtc != XCB_NONE) {
+                    char *oname;
+                    sasprintf(&oname, "%.*s",
+                              xcb_randr_get_output_info_name_length(info),
+                              xcb_randr_get_output_info_name(info));
+
+                    if (strcmp(name, oname) != 0) {
+                        struct output_name *output_name = scalloc(1, sizeof(struct output_name));
+                        output_name->name = sstrdup(oname);
+                        SLIST_INSERT_HEAD(&new->names_head, output_name, names);
+                    } else {
+                        free(oname);
+                    }
+                }
+                FREE(info);
+            }
+
+            /* Insert the monitor name last, so that it's used as the primary name */
             struct output_name *output_name = scalloc(1, sizeof(struct output_name));
             output_name->name = sstrdup(name);
-            SLIST_INIT(&new->names_head);
             SLIST_INSERT_HEAD(&new->names_head, output_name, names);
 
             if (monitor_info->primary) {