Merge of Insiders features tied to 'Black Pearl' funding goal

src/partials/javascripts/base.html

@@ -0,0 +1,39 @@
+<!--
+  Copyright (c) 2016-2021 Martin Donath <martin.donath@squidfunk.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to
+  deal in the Software without restriction, including without limitation the
+  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+  sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+-->
+
+<!--
+  A collection of functions used from within some partials to allow the usage
+  of state saved in local or session storage, e.g. to model preferences.
+-->
+<script>
+
+  /* Prepend the base path to the given key to ensure uniqueness */
+  function __prefix(key) {
+    var prefix = new URL("{{ base_url }}", location)
+    return prefix.pathname + "." + key
+  }
+
+  /* Fetch the given key from the given storage */
+  function __get(key, storage = localStorage) {
+    return JSON.parse(storage.getItem(__prefix(key)))
+  }
+</script>