1 files changed, 39 insertions, 0 deletions
diff --git a/app/javascript/mastodon/reducers/status_lists.js b/app/javascript/mastodon/reducers/status_lists.js
new file mode 100644
index 000000000..fd463cd63
--- /dev/null
+++ b/app/javascript/mastodon/reducers/status_lists.js
@@ -0,0 +1,39 @@
+import {
+  FAVOURITED_STATUSES_FETCH_SUCCESS,
+  FAVOURITED_STATUSES_EXPAND_SUCCESS
+} from '../actions/favourites';
+import Immutable from 'immutable';
+
+const initialState = Immutable.Map({
+  favourites: Immutable.Map({
+    next: null,
+    loaded: false,
+    items: Immutable.List()
+  })
+});
+
+const normalizeList = (state, listType, statuses, next) => {
+  return state.update(listType, listMap => listMap.withMutations(map => {
+    map.set('next', next);
+    map.set('loaded', true);
+    map.set('items', Immutable.List(statuses.map(item => item.id)));
+  }));
+};
+
+const appendToList = (state, listType, statuses, next) => {
+  return state.update(listType, listMap => listMap.withMutations(map => {
+    map.set('next', next);
+    map.set('items', map.get('items').concat(statuses.map(item => item.id)));
+  }));
+};
+
+export default function statusLists(state = initialState, action) {
+  switch(action.type) {
+  case FAVOURITED_STATUSES_FETCH_SUCCESS:
+    return normalizeList(state, 'favourites', action.statuses, action.next);
+  case FAVOURITED_STATUSES_EXPAND_SUCCESS:
+    return appendToList(state, 'favourites', action.statuses, action.next);
+  default:
+    return state;
+  }
+};