Adding ability to merge tags

elementactions/TagManager_MergeElementAction.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Craft;
+
+class TagManager_MergeElementAction extends BaseElementAction
+{
+    public function getName()
+    {
+        return Craft::t('Merge Tags');
+    }
+
+    public function getTriggerHtml()
+    {
+        $js = 'new Craft.ElementActionTrigger({
+                  handle: '.JsonHelper::encode($this->getClassHandle()).',
+                  validateSelection: function($selectedElements){ return $selectedElements.length > 1; },
+              });
+
+              $("#TagManager_Merge-actiontrigger").on("click", function() {
+                var elements = Craft.elementIndex.getSelectedElements();
+                var list = $(".merge-tags-list");
+
+                list.empty();
+
+                $.each(elements, function(index, element) {
+                    list.append("<li><a class=\'formsubmit\' data-param=\'merge_id\' data-value=" + element.dataset.id + ">" + element.innerText + "</a></li>");
+                });
+
+                $(document).ready(function() {
+                    Craft.initUiElements();
+                });
+
+                $(document).on("click", ".formsubmit", function(ev) {
+                    // Code adapted from formsubmit function in craft.js:1411
+
+                    var $btn = $(ev.currentTarget);
+                    var $form = $("#TagManager_Merge-actiontrigger");
+
+              			if ($btn.attr("data-param"))
+              			{
+              				$("<input type=\'hidden\'/>")
+              					.attr({
+              						name: $btn.attr("data-param"),
+              						value: $btn.attr("data-value")
+              					})
+              					.appendTo($form);
+              			}
+
+              			$form.submit();
+
+                    $("#merge-tags-menu").hide();
+              	});
+              });';
+
+        craft()->templates->includeJs($js);
+        craft()->templates->includeCss('h3.merge-tags-intro { padding-top: 14px; }');
+
+        return craft()->templates->render('tagmanager/_mergeTrigger');
+    }
+
+    public function isDestructive()
+    {
+        return true;
+    }
+
+    public function performAction(ElementCriteriaModel $criteria)
+    {
+        $mergeId = $this->getParams()->merge_id;
+        $elementIds = $criteria->ids();
+
+        foreach ($elementIds as $elementId)
+        {
+            if ($elementId != $mergeId) {
+                if (!craft()->elements->mergeElementsByIds($elementId, $mergeId)) {
+                    $this->setMessage(Craft::t('An error occurred while merging tags.'));
+                    return false;
+                }
+            }
+        }
+
+        // Success!
+        $this->setMessage(Craft::t('Tags merged successfully.'));
+        return true;
+    }
+
+    protected function defineParams()
+    {
+        return array(
+            'merge_id' => array(AttributeType::Number, 'required' => true)
+        );
+    }
+}

elementtypes/TagManagerElementType.php

@@ -56,6 +56,10 @@ public function getAvailableActions($source = null)
         ));
         $actions[] = $deleteAction;
 
+        // Merge
+        $mergeAction = craft()->elements->getAction('TagManager_Merge');
+        $actions[] = $mergeAction;
+
         // Allow plugins to add additional actions
         $allPluginActions = craft()->plugins->call('addTagManagerActions', array($source), true);
         foreach ($allPluginActions as $pluginActions) {

templates/_mergeTrigger.twig

@@ -0,0 +1,6 @@
+<div class="btn menubtn" role="button">{{ "Merge Tags"|t }}</div>
+<div class="menu" id="merge-tags-menu">
+    <h3 class="merge-tags-intro">Merge Selected Tags Into:</h3>
+    <hr>
+    <ul class="merge-tags-list"></ul>
+</div>