add support for invoking and assigning scenes by name.

cmd/lucy/scenecmd.go

@@ -93,15 +93,22 @@ func sceneCmd(
 		{
 			fetch := cmd.Params.Get(0).String()
 			id := cmd.Params.Get(1).Int()
-			if fetch == nil || id == nil {
-				log.Println("Usage: lucy scene assign <fetch> <id> <group=S> <duration=I>")
+			name := cmd.Params.Get(1).String()
+			if fetch == nil || (id == nil && name == nil) {
+				log.Println("Usage: lucy scene assign <fetch> <id|name> <group=S> <duration=I>")
 			}
 
-			devices, err := c.AssignDevice(ctx, *fetch, cmd.Name == "push", models.DeviceSceneAssignment{
-				SceneID:    *id,
+			assignment := models.DeviceSceneAssignment{
 				Group:      cmd.Params.Get("group").StringOr(*fetch),
 				DurationMS: int64(cmd.Params.Get("duration").IntOr(0)),
-			})
+			}
+			if id != nil {
+				assignment.SceneID = *id
+			} else {
+				assignment.SceneName = *name
+			}
+
+			devices, err := c.AssignDevice(ctx, *fetch, cmd.Name == "push", assignment)
 			if err != nil {
 				log.Println("Could not assign devices:", err)
 				return