Added "fields" widget

Outputs tiddler fields through a text template.

core/modules/widgets/fields.js

@@ -0,0 +1,78 @@
+/*\
+title: $:/core/modules/widgets/fields.js
+type: application/javascript
+module-type: widget
+
+The view widget displays the fields of a tiddler through a text substitution template.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.name = "fields";
+
+exports.init = function(renderer) {
+	// Save state
+	this.renderer = renderer;
+	// Generate child nodes
+	this.generateChildNodes();
+};
+
+exports.generateChildNodes = function() {
+	// Get parameters from our attributes
+	this.tiddlerTitle = this.renderer.getAttribute("tiddler",this.renderer.getContextTiddlerTitle());
+	this.template = this.renderer.getAttribute("template");
+	this.exclude = this.renderer.getAttribute("exclude");
+	// Get the tiddler we're displaying
+	var tiddler = this.renderer.renderTree.wiki.getTiddler(this.tiddlerTitle);
+	// Get the exclusion list
+	var exclude;
+	if(this.exclude) {
+		exclude = this.exclude.split(" ");
+	} else {
+		exclude = ["text"]; 
+	}
+	// Compose the template
+	var text = [];
+	if(this.template && tiddler) {
+		for(var field in tiddler.fields) {
+			if(exclude.indexOf(field) === -1) {
+				var row = this.template;
+				row = row.replace("$name$",field);
+				row = row.replace("$value$",tiddler.getFieldString(field));
+				row = row.replace("$encoded_value$",$tw.utils.htmlEncode(tiddler.getFieldString(field)));
+				text.push(row)
+			}
+		}
+	}
+	// Create the wrapper node
+	var node = {
+		type: "element",
+		tag: this.renderer.parseTreeNode.isBlock ? "div" : "span",
+		children: [{
+			type: "text",
+			text: text.join("")
+		}]
+	};
+	// Set up the attributes for the wrapper element
+	var classes = [];
+	if(this.renderer.hasAttribute("class")) {
+		$tw.utils.pushTop(classes,this.renderer.getAttribute("class").split(" "));
+	}
+	if(classes.length > 0) {
+		$tw.utils.addClassToParseTreeNode(node,classes.join(" "));
+	}
+	if(this.renderer.hasAttribute("style")) {
+		$tw.utils.addAttributeToParseTreeNode(node,"style",this.renderer.getAttribute("style"));
+	}
+	if(this.renderer.hasAttribute("tooltip")) {
+		$tw.utils.addAttributeToParseTreeNode(node,"title",this.renderer.getAttribute("tooltip"));
+	}
+	// Create the renderers for the wrapper and the children
+	this.children = this.renderer.renderTree.createRenderers(this.renderer.renderContext,[node]);
+};
+
+})();