swaybar: allow identifiers for output and tray

This allows `bar output` and `bar tray_output` to specify an output
identifier. Output names should still work as well.

This parses the output identifier from the xdg_output description,
which wlroots currently sets to `make model serial (name)`. Since this
could change in the future, all identifier comparisons are guarded by
NULL-checks in case the description cannot be parsed to an identifier.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/swaybar/bar.h b/include/swaybar/bar.h
index e377b8de..2d9ba0d9 100644
--- a/include/swaybar/bar.h
+++ b/include/swaybar/bar.h
@@ -61,6 +61,7 @@ struct swaybar_output {
         struct wl_list hotspots; // swaybar_hotspot::link
 
         char *name;
+        char *identifier;
         bool focused;
 
         uint32_t width, height;