X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=lib%2Fsup%2Fhorizontal-selector.rb;h=13c63ed38e17b4a5a91957aadd7417c89480abc1;hb=b7e80adc14797014993b983383d6816de3dcb1a7;hp=aef16d4844e2379d65c910332e4317eb758add19;hpb=3f69617ea17bf316cef829496834c56193dce2fb;p=sup

diff --git a/lib/sup/horizontal-selector.rb b/lib/sup/horizontal-selector.rb
index aef16d4..13c63ed 100644
--- a/lib/sup/horizontal-selector.rb
+++ b/lib/sup/horizontal-selector.rb
@@ -12,7 +12,13 @@ class HorizontalSelector
     @selection = 0
   end
 
-  def set_to val; @selection = @vals.index(val) end
+  def set_to val
+    if @vals.index(val)
+      @selection = @vals.index(val)
+    else
+      error "Invalid option ", val.inspect, " (valid options: ", @vals.inspect, ")"
+    end
+  end
 
   def val; @vals[@selection] end