Docs base plate?

docs/_static/settings.js

@@ -0,0 +1,106 @@
+'use-strict';
+
+let settingsModal;
+
+class Setting {
+  constructor(name, defaultValue, setter) {
+    this.name = name;
+    this.defaultValue = defaultValue;
+    this.setValue = setter;
+  }
+
+  setElement() {
+    throw new TypeError('Abstract methods should be implemented.');
+  }
+
+  load() {
+    let value = JSON.parse(localStorage.getItem(this.name));
+    this.value = value === null ? this.defaultValue : value;
+    try {
+      this.setValue(this.value);
+    } catch (error) {
+      console.error(`Failed to apply setting "${this.name}" With value:`, this.value);
+      console.error(error);
+    }
+  }
+
+  update() {
+    throw new TypeError('Abstract methods should be implemented.');
+  }
+
+}
+
+class CheckboxSetting extends Setting {
+
+  setElement() {
+    let element = document.querySelector(`input[name=${this.name}]`);
+    element.checked = this.value;
+  }
+
+  update(element) {
+    localStorage.setItem(this.name, element.checked);
+    this.setValue(element.checked);
+  }
+
+}
+
+class RadioSetting extends Setting {
+
+  setElement() {
+    let element = document.querySelector(`input[name=${this.name}][value=${this.value}]`);
+    element.checked = true;
+  }
+
+  update(element) {
+    localStorage.setItem(this.name, `"${element.value}"`);
+    this.setValue(element.value);
+  }
+
+}
+
+function getRootAttributeToggle(attributeName, valueName) {
+  function toggleRootAttribute(set) {
+    if (set) {
+      document.documentElement.setAttribute(`data-${attributeName}`, valueName);
+    } else {
+      document.documentElement.removeAttribute(`data-${attributeName}`);
+    }
+  }
+  return toggleRootAttribute;
+}
+
+function setTheme(value) {
+  if (value === 'automatic') {
+    if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+      document.documentElement.setAttribute('data-theme', 'dark');
+    } else {
+      document.documentElement.setAttribute('data-theme', 'light');
+    }
+  }
+  else {
+    document.documentElement.setAttribute('data-theme', value);
+  }
+}
+
+const settings = [
+  new CheckboxSetting('useSerifFont', false, getRootAttributeToggle('font', 'serif')),
+  new RadioSetting('setTheme', 'automatic', setTheme)
+]
+
+function updateSetting(element) {
+  let setting = settings.find((s) => s.name == element.name);
+  if (setting) {
+    setting.update(element);
+  }
+}
+
+for (const setting of settings) {
+  setting.load();
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+  settingsModal = new Modal(document.querySelector('div#settings.modal'));
+  for (const setting of settings) {
+    setting.setElement();
+  }
+});