connected sortable folder list to data api

browser/main/lib/dataApi/index.js

@@ -6,6 +6,7 @@ const dataApi = {
   createFolder: require('./createFolder'),
   updateFolder: require('./updateFolder'),
   deleteFolder: require('./deleteFolder'),
+  reorderFolder: require('./reorderFolder'),
   createNote: require('./createNote'),
   updateNote: require('./updateNote'),
   deleteNote: require('./deleteNote'),

browser/main/lib/dataApi/reorderFolder.js

@@ -0,0 +1,46 @@
+const _ = require('lodash')
+_.move = require('lodash-move').default
+const path = require('path')
+const resolveStorageData = require('./resolveStorageData')
+const CSON = require('@rokt33r/season')
+
+/**
+ * @param {String} storageKey
+ * @param {number} oldIndex
+ * @param {number} newIndex
+ *
+ * @return {Object}
+ * ```
+ * {
+ *   storage: Object
+ * }
+ * ```
+ */
+function reorderFolder (storageKey, oldIndex, newIndex) {
+  let rawStorages
+  let targetStorage
+  try {
+    if (!_.isNumber(oldIndex)) throw new Error('oldIndex must be a number.')
+    if (!_.isNumber(newIndex)) throw new Error('newIndex must be a number.')
+
+    rawStorages = JSON.parse(localStorage.getItem('storages'))
+    if (!_.isArray(rawStorages)) throw new Error('Target storage doesn\'t exist.')
+
+    targetStorage = _.find(rawStorages, {key: storageKey})
+    if (targetStorage == null) throw new Error('Target storage doesn\'t exist.')
+  } catch (e) {
+    return Promise.reject(e)
+  }
+
+  return resolveStorageData(targetStorage)
+    .then(function reorderFolder (storage) {
+      storage.folders = _.move(storage.folders, oldIndex, newIndex)
+      CSON.writeFileSync(path.join(storage.path, 'boostnote.json'), _.pick(storage, ['folders', 'version']))
+
+      return {
+        storage
+      }
+    })
+}
+
+module.exports = reorderFolder