Persist nightmode so we can re-enable it

Right now the night mode is possible to set by a toggle in the menu bar
but needs to be re-enabled on every document switch, reload, etc.. This
is super annoying so we should keep this state in local storage or
a cookie.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

public/js/index.js

@@ -16,6 +16,7 @@ import toMarkdown from 'to-markdown'
 
 import { saveAs } from 'file-saver'
 import randomColor from 'randomcolor'
+import store from 'store'
 
 import _ from 'lodash'
 
@@ -431,11 +432,12 @@ $(document).ready(function () {
     clearMap()
   }
   checkEditorStyle()
-  /* we need this only on touch devices */
-  if (isTouchDevice) {
+
   /* cache dom references */
   var $body = $('body')
 
+  /* we need this only on touch devices */
+  if (isTouchDevice) {
     /* bind events */
     $(document)
     .on('focus', 'textarea, input', function () {
@@ -445,6 +447,12 @@ $(document).ready(function () {
       $body.removeClass('fixfixed')
     })
   }
+
+  // Re-enable nightmode
+  if (store.get('nightMode') || Cookies.get('nightMode')) {
+    $body.addClass('night')
+  }
+
   // showup
   $().showUp('.navbar', {
     upClass: 'navbar-hide',
@@ -1680,6 +1688,13 @@ function toggleNightMode () {
     $body.addClass('night')
     appState.nightMode = true
   }
+  if (store.enabled) {
+    store.set('nightMode', !isActive)
+  } else {
+    Cookies.set('nightMode', !isActive, {
+      expires: 365
+    })
+  }
 }
 function emitPermission (_permission) {
   if (_permission !== permission) {