feat(bait): add catchOnce function

golibs/bait/bait.go

@@ -38,6 +38,7 @@ failed, etc. To find all available hooks, see doc hooks.`)
 
 	L.SetField(mod, "throw", luar.New(L, b.bthrow))
 	L.SetField(mod, "catch", luar.New(L, b.bcatch))
+	L.SetField(mod, "catchOnce", luar.New(L, b.bcatchOnce))
 
 	L.Push(mod)
 
@@ -55,3 +56,9 @@ func (b *Bait) bthrow(name string, args ...interface{}) {
 func (b *Bait) bcatch(name string, catcher func(...interface{})) {
 	b.Em.On(name, catcher)
 }
+
+// catchOnce(name, cb)
+// Same as catch, but only runs the `cb` once and then removes the hook
+func (b *Bait) bcatchOnce(name string, catcher func(...interface{})) {
+	b.Em.Once(name, catcher)
+}