Add init command to initialise a wiki folder

Fixes #362

core/modules/commands/init.js

@@ -0,0 +1,47 @@
+/*\
+title: $:/core/modules/commands/init.js
+type: application/javascript
+module-type: command
+
+Command to initialise an empty wiki folder
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.info = {
+	name: "init",
+	synchronous: true
+};
+
+var Command = function(params,commander) {
+	this.params = params;
+	this.commander = commander;
+};
+
+Command.prototype.execute = function() {
+	var path = require("path"),
+		editionName = this.params[0] || "empty";
+	// Check that we don't already have a valid wiki folder
+	if($tw.boot.wikiTiddlersPath) {
+		return "Wiki folder is not empty";
+	}
+	// Check the edition exists
+	var editionPath = path.resolve($tw.boot.corePath,$tw.config.editionsPath) + "/" + editionName;
+	if(!$tw.utils.isDirectory(editionPath)) {
+		return "Edition '" + editionName + "' not found";
+	}
+	// Copy the edition content
+	var err = $tw.utils.copyDirectory(editionPath,$tw.boot.wikiPath);
+	if(!err) {
+		this.commander.streams.output.write("Copied edition '" + editionName + "' to " + $tw.boot.wikiPath + "\n");
+	}
+	return err;
+};
+
+exports.Command = Command;
+
+})();