Adding modding folder with a hacked build.

modding/hacked/ss1/edit/undoable/cmd/List.go

@@ -0,0 +1,30 @@
+package cmd
+
+import "github.com/inkyblackness/hacked/ss1/world"
+
+// List is a sequence of commands, which are executed as one step.
+type List []Command
+
+// Do performs the entries in the list in ascending order.
+// If an entry returns an error, the iteration is aborted and that error is returned.
+func (list List) Do(modder world.Modder) error {
+	for _, entry := range list {
+		err := entry.Do(modder)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Undo performs the entries in the list in descending order.
+// If an entry returns an error, the iteration is aborted and that error is returned.
+func (list List) Undo(modder world.Modder) error {
+	for i := len(list) - 1; i >= 0; i-- {
+		err := list[i].Undo(modder)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}