Progress on action choices

app/imports/api/engine/action/functions/userInput/saveInputChoices.ts

@@ -0,0 +1,28 @@
+import { EngineAction } from '/imports/api/engine/action/EngineActions';
+import InputProvider from '/imports/api/engine/action/functions/userInput/InputProvider';
+
+/**
+ * Create a new version of the user input function, that saves the user's choices to an array
+ * before returning them
+ */
+export default function saveInputChoices(action: EngineAction, userInput: InputProvider): InputProvider {
+  const newInputProvider: Partial<InputProvider> = {};
+
+  if (!action._choices) {
+    action._choices = [];
+  }
+
+  // For every function in the given input provider
+  for (const key in userInput) {
+    const oldFn = userInput[key];
+    // Make a new function that does the same thing, but saves the result to action._choices
+    const newFn = (...args) => {
+      const result = oldFn(...args);
+      action._choices.push(result);
+      return result;
+    }
+    newInputProvider[key] = newFn;
+  }
+
+  return newInputProvider as InputProvider;
+}