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client/src/js/reducers/tab.js

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+import { Record, List } from 'immutable';
+import { UPDATE_PATH } from 'redux-simple-router';
+import createReducer from '../util/createReducer';
+import * as actions from '../actions';
+
+const Tab = Record({
+  server: null,
+  channel: null,
+  user: null
+});
+
+const State = Record({
+  selected: new Tab(),
+  history: List()
+});
+
+export default createReducer(new State(), {
+  [actions.SELECT_TAB](state, action) {
+    const tab = new Tab(action);
+    return state
+      .set('selected', tab)
+      .update('history', history => history.push(tab));
+  },
+
+  [actions.PART](state, action) {
+    return state.set('history', state.history.filter(tab =>
+      !(tab.server === action.server && tab.channel === action.channels[0])
+    ));
+  },
+
+  [actions.CLOSE_PRIVATE_CHAT](state, action) {
+    return state.set('history', state.history.filter(tab =>
+      !(tab.server === action.server && tab.user === action.nick)
+    ));
+  },
+
+  [actions.DISCONNECT](state, action) {
+    return state.set('history', state.history.filter(tab => tab.server !== action.server));
+  },
+
+  [UPDATE_PATH](state, action) {
+    if (action.payload.path.indexOf('.') === -1 && state.selected.server) {
+      return state.set('selected', new Tab());
+    }
+
+    return state;
+  }
+});