SIP-32: Moving frontend code to the base of the repo (#9098)

* move assets out, get webpack dev working

* update docs to reference superset-frontend

* draw the rest of the owl

* fix docs

* fix webpack script

* rats

* correct docs

* fix tox dox

superset-frontend/src/utils/reducerUtils.js

@@ -0,0 +1,71 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import shortid from 'shortid';
+
+export function addToObject(state, arrKey, obj) {
+  const newObject = Object.assign({}, state[arrKey]);
+  const copiedObject = Object.assign({}, obj);
+
+  if (!copiedObject.id) {
+    copiedObject.id = shortid.generate();
+  }
+  newObject[copiedObject.id] = copiedObject;
+  return Object.assign({}, state, { [arrKey]: newObject });
+}
+
+export function alterInObject(state, arrKey, obj, alterations) {
+  const newObject = Object.assign({}, state[arrKey]);
+  newObject[obj.id] = Object.assign({}, newObject[obj.id], alterations);
+  return Object.assign({}, state, { [arrKey]: newObject });
+}
+
+export function alterInArr(state, arrKey, obj, alterations) {
+  // Finds an item in an array in the state and replaces it with a
+  // new object with an altered property
+  const idKey = 'id';
+  const newArr = [];
+  state[arrKey].forEach(arrItem => {
+    if (obj[idKey] === arrItem[idKey]) {
+      newArr.push(Object.assign({}, arrItem, alterations));
+    } else {
+      newArr.push(arrItem);
+    }
+  });
+  return Object.assign({}, state, { [arrKey]: newArr });
+}
+
+export function removeFromArr(state, arrKey, obj, idKey = 'id') {
+  const newArr = [];
+  state[arrKey].forEach(arrItem => {
+    if (!(obj[idKey] === arrItem[idKey])) {
+      newArr.push(arrItem);
+    }
+  });
+  return Object.assign({}, state, { [arrKey]: newArr });
+}
+
+export function addToArr(state, arrKey, obj) {
+  const newObj = Object.assign({}, obj);
+  if (!newObj.id) {
+    newObj.id = shortid.generate();
+  }
+  const newState = {};
+  newState[arrKey] = [...state[arrKey], newObj];
+  return Object.assign({}, state, newState);
+}