From e1ed4d34387d34a06a7c92125d0e2d4acc31cbae Mon Sep 17 00:00:00 2001
From: Jordan Eldredge <jordan@jordaneldredge.com>
Date: Mon, 28 Aug 2017 08:39:42 -0700
Subject: [PATCH] Allow overriding partial state via hash

---
 js/store.js | 13 +++++++++++--
 js/utils.js | 13 +++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/js/store.js b/js/store.js
index efe97f60..ee3b33a7 100644
--- a/js/store.js
+++ b/js/store.js
@@ -3,12 +3,21 @@ import reducer from "./reducers";
 import thunk from "redux-thunk";
 import { composeWithDevTools } from "redux-devtools-extension";
 import mediaMiddleware from "./mediaMiddleware";
+import { merge } from "./utils";
 
-const getStore = (winamp, initialState) =>
-  createStore(
+const getStore = (winamp, stateOverrides) => {
+  let initialState;
+  if (stateOverrides) {
+    initialState = merge(
+      reducer(undefined, { type: "@@init" }),
+      stateOverrides
+    );
+  }
+  return createStore(
     reducer,
     initialState,
     composeWithDevTools(applyMiddleware(thunk, mediaMiddleware(winamp.media)))
   );
+};
 
 export default getStore;
diff --git a/js/utils.js b/js/utils.js
index f94c763e..a704f37a 100644
--- a/js/utils.js
+++ b/js/utils.js
@@ -78,3 +78,16 @@ export const normalize = rebound(1, 64, 1, 100);
 
 // Convert a 0-100 to an .eqf value
 export const denormalize = rebound(1, 100, 1, 64);
+
+// Merge a `source` object to a `target` recursively
+export const merge = (target, source) => {
+  // Iterate through `source` properties and if an `Object` set property to merge of `target` and `source` properties
+  for (const key of Object.keys(source)) {
+    if (source[key] instanceof Object)
+      Object.assign(source[key], merge(target[key], source[key]));
+  }
+
+  // Join `target` and modified `source`
+  Object.assign(target || {}, source);
+  return target;
+};