Misago/frontend/src/reducers/selection.js

import { toggle } from 'misago/utils/sets';

export const SELECT_ALL = 'SELECT_ALL';
export const SELECT_NONE = 'SELECT_NONE';
export const SELECT_ITEM = 'SELECT_ITEM';

export function all(itemsIds) {
  return {
    type: SELECT_ALL,
    items: itemsIds
  };
}

export function none() {
  return {
    type: SELECT_NONE
  };
}

export function item(itemId) {
  return {
    type: SELECT_ITEM,
    item: itemId
  };
}

export default function selection(state=[], action=null) {
  switch (action.type) {
    case SELECT_ALL:
      return action.items;

    case SELECT_NONE:
      return [];

    case SELECT_ITEM:
      return toggle(state, action.item);

    default:
      return state;
  }
}