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app/javascript/gabsocial/reducers/gab_trends.js

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+import {
+  GAB_TRENDS_RESULTS_FETCH_REQUEST,
+  GAB_TRENDS_RESULTS_FETCH_SUCCESS,
+  GAB_TRENDS_RESULTS_FETCH_FAIL
+} from '../actions/gab_trends'
+import {
+  Map as ImmutableMap,
+  List as ImmutableList,
+  fromJS
+} from 'immutable'
+
+const initialState = ImmutableMap({
+  items: ImmutableList(),
+  loading: false,
+  error: false,
+})
+
+export default function (state = initialState, action) {
+  switch (action.type) {
+    case GAB_TRENDS_RESULTS_FETCH_REQUEST:
+      return state.set('loading', true)
+    case GAB_TRENDS_RESULTS_FETCH_SUCCESS:
+      return state.withMutations(map => {
+        map.set('items', fromJS(action.items));
+        map.set('error', false);
+        map.set('loading', false);
+      });
+    case GAB_TRENDS_RESULTS_FETCH_FAIL:
+      return state.withMutations(map => {
+        map.set('error', !!action.error);
+        map.set('loading', false);
+      });
+    default:
+      return state
+  }
+}