JSZip Plugin: Add ability to build and download ZIP files

plugins/tiddlywiki/jszip/startup.js

@@ -0,0 +1,103 @@
+/*\
+title: $:/plugins/tiddlywiki/jszip/startup.js
+type: application/javascript
+module-type: startup
+
+Setup the root widget event handlers
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var JSZip = require("$:/plugins/tiddlywiki/jszip/jszip.js");
+
+// Export name and synchronous status
+exports.name = "jszip";
+exports.platforms = ["browser"];
+exports.after = ["startup"];
+exports.synchronous = true;
+
+// Install the root widget event handlers
+exports.startup = function() {
+	$tw.rootWidget.addEventListener("tm-zip-create",function(event) {
+		if(event.param) {
+			var zip = new JSZip();
+			saveZipTiddler(event.param,zip);
+		}
+	});
+	$tw.rootWidget.addEventListener("tm-zip-add-text-file",function(event) {
+		var paramObject = event.paramObject || {};
+		if(event.param && paramObject.filename && paramObject.text) {
+			var zip = loadZipTiddler(event.param);
+			zip.file(paramObject.filename,paramObject.text);
+			saveZipTiddler(event.param,zip);
+		}
+	});
+	$tw.rootWidget.addEventListener("tm-zip-render-file",function(event) {
+		var paramObject = event.paramObject || {};
+		if(event.param && paramObject.filename && paramObject.template) {
+			var zip = loadZipTiddler(event.param),
+				outputType = paramObject.output || "text/plain",
+				templateTitle = paramObject.template,
+				text = $tw.wiki.renderTiddler(outputType,templateTitle,{
+					parseAsInline: paramObject.mode === "inline",
+					variables: {
+						currentTiddler: paramObject.tiddler
+					}
+				});
+			zip.file(paramObject.filename,text);
+			saveZipTiddler(event.param,zip);
+		}
+	});
+	$tw.rootWidget.addEventListener("tm-zip-download",function(event) {
+		var paramObject = event.paramObject || {};
+		if(event.param) {
+			downloadZipFile(event.param,paramObject.filename || "file.zip");
+		}
+	});
+};
+
+function loadZipTiddler(title) {
+	return $tw.wiki.getGlobalCache("jszip",function() {
+		var zip = new JSZip(),
+			tiddler = $tw.wiki.getTiddler(title);
+		if(tiddler && tiddler.fields.type === "application/zip") {
+			try {
+				zip.load(tiddler.fields.text,{
+					base64: true
+				});
+			} catch(e) {
+				console.log("JSZip error: " + e)
+			}
+		}
+		return zip;		
+	});
+}
+
+function saveZipTiddler(title,zip) {
+	var data = zip.generate({
+			type: "base64"
+		});
+	$tw.wiki.addTiddler({
+		title: title,
+		type: "application/zip",
+		text: data
+	});
+}
+
+function downloadZipFile(title,filename) {
+	var tiddler = $tw.wiki.getTiddler(title);
+	if(tiddler && tiddler.fields.text && tiddler.fields.type === "application/zip") {
+		var link = document.createElement("a");
+		link.setAttribute("href","data:application/zip;base64," + encodeURIComponent(tiddler.fields.text));
+		link.setAttribute("download",filename);
+		document.body.appendChild(link);
+		link.click();
+		document.body.removeChild(link);
+	}
+}
+
+})();