Disable the export and import tabs if no export or import plugins are enabled.

htdocs/export/index.php

@@ -34,7 +34,13 @@ $SESSION->set('exportdata', '');
 $SESSION->set('exportfile', '');
 
 $exportoptions = array();
-foreach (plugins_installed('export') as $plugin) {
+$exportplugins = plugins_installed('export');
+
+if (!$exportplugins) {
+    die_info(get_string('noexportpluginsenabled', 'export'));
+}
+
+foreach ($exportplugins as $plugin) {
     safe_require('export', $plugin->name);
     $exportoptions[$plugin->name] = array(
         'text' => call_static_method(generate_class_name('export', $plugin->name), 'get_title'),

htdocs/import/index.php

@@ -29,6 +29,12 @@ define('MENUITEM', 'myportfolio/import');
 require(dirname(dirname(__FILE__)) . '/init.php');
 define('TITLE', get_string('import', 'import'));
 
+$importplugins = plugins_installed('import');
+
+if (!$importplugins) {
+    die_info(get_string('noimportpluginsenabled', 'import'));
+}
+
 $form = pieform(array(
     'name' => 'import',
     'elements' => array(

htdocs/lang/en.utf8/export.php

@@ -34,6 +34,7 @@ $string['exportgeneratedsuccessfully'] = 'Export generated successfully. %sClick
 $string['exportgeneratedsuccessfullyjs'] = 'Export generated successfully. %sContinue%s';
 $string['exportyourportfolio'] = 'Export Your Portfolio';
 $string['generateexport'] = 'Generate export';
+$string['noexportpluginsenabled'] = 'No export plugins have been enabled by the administrator, so you are unable to use this feature';
 $string['justsomeviews'] = 'Just some of my Views';
 $string['pleasewaitwhileyourexportisbeinggenerated'] = 'Please wait while your export is being generated...';
 $string['Starting'] = 'Starting';

htdocs/lang/en.utf8/import.php

@@ -27,3 +27,6 @@
 defined('INTERNAL') || die();
 
 $string['import']     = 'Import';
+$string['noimportpluginsenabled'] = 'No import plugins have been enabled by the administrator, so you are unable to use this feature';
+
+?>

htdocs/lib/web.php

@@ -1685,6 +1685,8 @@ function institutional_admin_nav() {
  * @return $standardnav a data structure containing the standard navigation
  */
 function mahara_standard_nav() {
+    $exportenabled = plugins_installed('export');
+    $importenabled = plugins_installed('import');
     $menu = array(
         array(
             'path' => '',
@@ -1709,12 +1711,14 @@ function mahara_standard_nav() {
             'url' => 'export/',
             'title' => get_string('Export', 'export'),
             'weight' => 30,
+            'ignore' => !$exportenabled,
         ),
         array(
             'path' => 'myportfolio/import',
             'url' => 'import/',
             'title' => get_string('import', 'import'),
             'weight' => 30,
+            'ignore' => !$importenabled,
         ),
         array(
             'path' => 'profile/view',
@@ -1789,6 +1793,8 @@ function mahara_standard_nav() {
             'weight' => 40,
         ),
     );
+
+    $menu = array_filter($menu, create_function('$a', 'return empty($a["ignore"]);'));
     
     if ($plugins = get_records_array('artefact_installed', 'active', 1)) {
         foreach ($plugins as &$plugin) {