Add action-createtiddler widget

Basically the same as sending a tm-new-tiddler message except that the
newly created tiddler is not added to the story.

core/modules/widgets/action-createtiddler.js

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+/*\
+title: $:/core/modules/widgets/action-createtiddler.js
+type: application/javascript
+module-type: widget
+
+Action widget to create a new tiddler with a unique name and specified fields.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var Widget = require("$:/core/modules/widgets/widget.js").widget;
+
+var CreateTiddlerWidget = function(parseTreeNode,options) {
+	this.initialise(parseTreeNode,options);
+};
+
+/*
+Inherit from the base widget class
+*/
+CreateTiddlerWidget.prototype = new Widget();
+
+/*
+Render this widget into the DOM
+*/
+CreateTiddlerWidget.prototype.render = function(parent,nextSibling) {
+	this.computeAttributes();
+	this.execute();
+};
+
+/*
+Compute the internal state of the widget
+*/
+CreateTiddlerWidget.prototype.execute = function() {
+	this.actionBaseTitle = this.getAttribute("$basetitle");
+	this.actionSaveTitle = this.getAttribute("$savetitle");
+	this.actionTimestamp = this.getAttribute("$timestamp","yes") === "yes";
+};
+
+/*
+Refresh the widget by ensuring our attributes are up to date
+*/
+CreateTiddlerWidget.prototype.refresh = function(changedTiddlers) {
+	var changedAttributes = this.computeAttributes();
+	if($tw.utils.count(changedAttributes) > 0) {
+		this.refreshSelf();
+		return true;
+	}
+	return this.refreshChildren(changedTiddlers);
+};
+
+/*
+Invoke the action associated with this widget
+*/
+CreateTiddlerWidget.prototype.invokeAction = function(triggeringWidget,event) {
+	var title = this.wiki.generateNewTitle(this.actionBaseTitle),
+		fields = {},
+		creationFields,
+		modificationFields;
+	$tw.utils.each(this.attributes,function(attribute,name) {
+		if(name.charAt(0) !== "$") {
+			fields[name] = attribute;
+		}
+	});
+	if(this.actionTimestamp) {
+		creationFields = this.wiki.getCreationFields();
+		modificationFields = this.wiki.getModificationFields();
+	}
+	var tiddler = this.wiki.addTiddler(new $tw.Tiddler(creationFields,fields,modificationFields,{title: title}));
+	if(this.actionSaveTitle) {
+		this.wiki.setTextReference(this.actionSaveTitle,title,this.getVariable("currentTiddler"));
+	}
+	return true; // Action was invoked
+};
+
+exports["action-createtiddler"] = CreateTiddlerWidget;
+
+})();

editions/tw5.com/tiddlers/widgets/ActionCreateTiddlerWidget.tid

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+caption: action-createtiddler
+created: 20161020152745942
+modified: 20161020155119177
+tags: Widgets ActionWidgets
+title: ActionCreateTiddlerWidget
+type: text/vnd.tiddlywiki
+
+! Introduction
+
+The ''action-createtiddler'' widget is an [[action widget|ActionWidgets]] that creates new tiddlers. ActionWidgets are used within triggering widgets such as the ButtonWidget.
+
+There are several differences from the [[tm-new-tiddler message|WidgetMessage: tm-new-tiddler]]:
+
+* The new tiddler is not automatically displayed in the [[story river|StoryRiver]]
+* The title of the new tiddler is made available for subsequent operations
+
+! Content and Attributes
+
+The ''action-createtiddler'' widget is invisible. Any content within it is ignored.
+
+|!Attribute |!Description |
+|$basetitle |The initial title that will be attempted. If a tiddler with that title already exists, then a numerical counter is added to the title and incremented until it is unique|
+|$savetitle |A text reference identifying a field or index into which the title of the newly created tiddler will be stored after it is created |
+|$timestamp |Specifies whether the timestamp(s) of the target tiddler will be updated (''modified'' and ''modifier'', plus ''created'' and ''creator'' for newly created tiddlers). Can be "yes" (the default) or "no" |
+|//{any attributes not starting with $}// |Each attribute name specifies a field to be created in the new tiddler  |
+
+! Examples
+
+<$macrocall $name='wikitext-example-without-html'
+src={{ActionCreateTiddlerWidget Example}}/>

editions/tw5.com/tiddlers/widgets/ActionCreateTiddlerWidget_Example.tid

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+created: 20161020153426686
+modified: 20161020155142990
+tags: ActionCreateTiddlerWidget
+title: ActionCreateTiddlerWidget Example
+type: text/vnd.tiddlywiki
+
+New button caption: <$edit-text tiddler="$:/state/new-button-caption" tag="input" default=""/>
+
+<$button>
+<$action-createtiddler $basetitle="Homemade Button" tags="$:/tags/PageControls" text={{$:/state/new-button-caption}}/>
+Create non-functional page control button
+</$button>