feat(mvc): add preview mode setting

airtime_mvc/application/controllers/PreferenceController.php

@@ -56,6 +56,7 @@ class PreferenceController extends Zend_Controller_Action
                 Application_Model_Preference::SetDefaultTimezone($values["timezone"]);
                 Application_Model_Preference::SetWeekStartDay($values["weekStartDay"]);
                 Application_Model_Preference::setRadioPageDisplayLoginButton($values["radioPageLoginButton"]);
+                Application_Model_Preference::SetFeaturePreviewMode($values["featurePreviewMode"]);
 
                 $logoUploadElement = $form->getSubForm('preferences_general')->getElement('stationLogo');
                 $logoUploadElement->receive();

airtime_mvc/application/forms/GeneralPreferences.php

@@ -210,6 +210,21 @@ class Application_Form_GeneralPreferences extends Zend_Form_SubForm
         $radioPageLoginButton->setLabel(_("Display login button on your Radio Page?"));
         $radioPageLoginButton->setValue($displayRadioPageLoginButtonValue);
         $this->addElement($radioPageLoginButton);
+
+        $feature_preview_mode = new Zend_Form_Element_Radio('featurePreviewMode');
+        $feature_preview_mode->setLabel(_('Feature Previews'));
+        $feature_preview_mode->setMultiOptions(array(
+            _("Disabled"),
+            _("Enabled"),
+        ));
+        $feature_preview_mode->setValue(Application_Model_Preference::GetFeaturePreviewMode());
+        $feature_preview_mode->setDescription(_('Enable this to opt-in to test new features.'));
+        $feature_preview_mode->setSeparator(' '); //No <br> between radio buttons
+        $feature_preview_mode->addDecorator('HtmlTag', array('tag' => 'dd',
+            'id'=>"featurePreviewMode-element",
+            'class' => 'radio-inline-list',
+        ));
+        $this->addElement($feature_preview_mode);
     }
 
     private function getWeekStartDays()

airtime_mvc/application/models/Preference.php

@@ -1653,4 +1653,23 @@ class Application_Model_Preference
     public static function SetAllowedCorsUrls($value) {
         self::setValue('allowed_cors_urls', $value);
     }
+
+    /**
+     * Getter for feature preview mode.
+     *
+     * @return bool
+     */
+    public static function GetFeaturePreviewMode() {
+        return self::getValue('feature_preview_mode') === '1';
+    }
+
+    /**
+     * Setter for feature preview mode.
+     *
+     * @param bool $value
+     * @return void
+     */
+    public static function SetFeaturePreviewMode($value) {
+        return self::setValue('feature_preview_mode', $value);
+    }
 }

airtime_mvc/application/views/scripts/form/preferences_general.phtml

@@ -41,6 +41,8 @@
 
         <?php echo $this->element->getElement('podcastAutoSmartblock')->render() ?>
 
+        <?php echo $this->element->getElement('featurePreviewMode')->render() ?>
+
         <?php echo $this->element->getElement('thirdPartyApi')->render() ?>
         <?php echo $this->element->getElement('allowedCorsUrls')->render() ?>
 

docs/_docs/settings.md

@@ -52,6 +52,11 @@ default.
 
 ![](/img/api-settings.png)
 
+You can opt-in to test new features with the **Feature Previews** option.
+Features that we soft rollout this way may need more feedback or still have
+tolerable bugs. This contains but is not limited to features like large ui
+refactors. You can switch back at any time.
+
 You can enable live, read-only access to the LibreTime schedule calendar for
 your station's public website with the **Public LibreTime API** option, if you
 wish. (There is more about this feature in the