Add experimental support for building plugins in the browser

It’s a bit rough and ready, but works.

core/modules/utils/pluginmaker.js

@@ -0,0 +1,80 @@
+/*\
+title: $:/core/modules/utils/pluginmaker.js
+type: application/javascript
+module-type: utils
+
+A quick and dirty way to pack up plugins within the browser.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Repack a plugin, and then delete any non-shadow payload tiddlers
+*/
+exports.repackPlugin = function(title,additionalTiddlers,excludeTiddlers) {
+	additionalTiddlers = additionalTiddlers || [];
+	excludeTiddlers = excludeTiddlers || [];
+	// Get the plugin tiddler
+	var pluginTiddler = $tw.wiki.getTiddler(title);
+	if(!pluginTiddler) {
+		throw "No such tiddler as " + title;
+	}
+	// Extract the JSON
+	try {
+		var jsonPluginTiddler = JSON.parse(pluginTiddler.fields.text);
+	} catch(e) {
+		throw "Cannot parse plugin tiddler " + title + "\nError: " + e;
+	}
+	// Get the list of tiddlers
+	var tiddlers = Object.keys(jsonPluginTiddler.tiddlers);
+	// Add the additional tiddlers
+	$tw.utils.pushTop(tiddlers,additionalTiddlers)
+	// Remove any excluded tiddlers
+	for(var t=tiddlers.length-1; t>=0; t--) {
+		if(excludeTiddlers.indexOf(tiddlers[t]) !== -1) {
+			tiddlers.splice(t,1);
+		}
+	}
+	// Pack up the tiddlers into a block of JSON
+	var plugins = {};
+	$tw.utils.each(tiddlers,function(title) {
+		var tiddler = $tw.wiki.getTiddler(title),
+			fields = {};
+		$tw.utils.each(tiddler.fields,function (value,name) {
+			fields[name] = tiddler.getFieldString(name);
+		});
+		plugins[title] = fields;
+	});
+	// Retrieve and bump the version number
+	var pluginVersion = $tw.utils.parseVersion(pluginTiddler.getFieldString("version") || "0.0.0") || {
+			major: "0",
+			minor: "0",
+			patch: "0"
+		};
+	pluginVersion.patch++;
+	var version = pluginVersion.major + "." + pluginVersion.minor + "." + pluginVersion.patch;
+	if(pluginVersion.prerelease) {
+		version += "-" + pluginVersion.prerelease;
+	}
+	if(pluginVersion.build) {
+		version += "+" + pluginVersion.build;
+	}
+	// Save the tiddler
+	$tw.wiki.addTiddler(new $tw.Tiddler(pluginTiddler,{text: JSON.stringify({tiddlers: plugins},null,4), version: version}));
+	// Delete any non-shadow constituent tiddlers
+	$tw.utils.each(tiddlers,function(title) {
+		if($tw.wiki.tiddlerExists(title)) {
+			$tw.wiki.deleteTiddler(title);
+		}
+	});
+	// Trigger an autosave
+	$tw.rootWidget.dispatchEvent({type: "tw-auto-save-wiki"});
+	// Return a heartwarming confirmation
+	return "Plugin " + title + " successfully saved";
+}
+
+})();