Add renaming to text-slicer tiddler toolbar

The plan is to expose the functionality in other places, too - for
example, the edit template and the tag manager

core/modules/wiki-bulkops.js

@@ -0,0 +1,53 @@
+/*\
+title: $:/core/modules/wiki-bulkops.js
+type: application/javascript
+module-type: wikimethod
+
+Bulk tiddler operations such as rename.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Rename a tiddler, and relink any tags or lists that reference it.
+*/
+exports.renameTiddler = function(fromTitle,toTitle) {
+	var self = this;
+	fromTitle = (fromTitle || "").trim();
+	toTitle = (toTitle || "").trim();
+	if(fromTitle && toTitle && fromTitle !== toTitle) {
+		// Rename the tiddler itself
+		var tiddler = this.getTiddler(fromTitle);
+		this.addTiddler(new $tw.Tiddler(tiddler,{title: toTitle},this.getModificationFields()));
+		this.deleteTiddler(fromTitle);
+		// Rename any tags or lists that reference it
+		this.each(function(tiddler,title) {
+			var tags = (tiddler.fields.tags || []).slice(0),
+				list = (tiddler.fields.list || []).slice(0),
+				isModified = false;
+			// Rename tags
+			$tw.utils.each(tags,function (title,index) {
+				if(title === fromTitle) {
+					tags[index] = toTitle;
+					isModified = true;
+				}
+			});
+			// Rename lists
+			$tw.utils.each(list,function (title,index) {
+				if(title === fromTitle) {
+					list[index] = toTitle;
+					isModified = true;
+				}
+			});
+			if(isModified) {
+				self.addTiddler(new $tw.Tiddler(tiddler,{tags: tags, list: list},self.getModificationFields()));
+			}
+		});
+	}
+}
+
+})();