Add a hook for showing sidebar sections

EVENTS.txt

@@ -34,3 +34,8 @@ StartShowLaconicaScripts: Showing Laconica script links (use this to link to a C
 EndShowLaconicaScripts: End showing Laconica script links
 - $action: the current action
 
+StartShowSections: Start the list of sections in the sidebar
+- $action: the current action
+
+EndShowSections: End the list of sections in the sidebar
+- $action: the current action

lib/action.php

@@ -524,12 +524,16 @@ class Action extends HTMLOutputter // lawsuit
      *
      * @return nothing
      */
+
     function showAside()
     {
         $this->elementStart('div', array('id' => 'aside_primary',
                                          'class' => 'aside'));
         $this->showExportData();
-        $this->showSections();
+        if (Event::handle('StartShowSections', array($this))) {
+            $this->showSections();
+            Event::handle('EndShowSections', array($this));
+        }
         $this->elementEnd('div');
     }