Add init command to initialise a wiki folder

Fixes #362

core/modules/utils/filesystem.js

@@ -0,0 +1,111 @@
+/*\
+title: $:/core/modules/utils/filesystem.js
+type: application/javascript
+module-type: utils-node
+
+File system utilities
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var fs = require("fs"),
+	path = require("path");
+
+/*
+Recursively (and synchronously) copy a directory and all its content
+*/
+exports.copyDirectory = function(srcPath,dstPath) {
+	// Remove any trailing path separators
+	srcPath = $tw.utils.removeTrailingSeparator(srcPath);
+	dstPath = $tw.utils.removeTrailingSeparator(dstPath);
+	// Create the destination directory
+	var err = $tw.utils.createDirectory(dstPath);
+	if(err) {
+		return err;
+	}
+	// Function to copy a folder full of files
+	var copy = function(srcPath,dstPath) {
+		var srcStats = fs.lstatSync(srcPath),
+			dstExists = fs.existsSync(dstPath);
+		if(srcStats.isFile()) {
+			$tw.utils.copyFile(srcPath,dstPath);
+		} else if(srcStats.isDirectory()) {
+			var items = fs.readdirSync(srcPath);
+			for(var t=0; t<items.length; t++) {
+				var item = items[t],
+					err = copy(srcPath + path.sep + item,dstPath + path.sep + item);
+				if(err) {
+					return err;
+				}
+			};
+		}
+	};
+	copy(srcPath,dstPath);
+	return null;
+};
+
+/*
+Copy a file
+*/
+var FILE_BUFFER_LENGTH = 64 * 1024,
+	fileBuffer = $tw.node && new Buffer(FILE_BUFFER_LENGTH);
+
+exports.copyFile = function(srcPath,dstPath) {
+	// Create any directories in the destination
+	$tw.utils.createDirectory(path.dirname(dstPath));
+	// Copy the file
+	var srcFile = fs.openSync(srcPath,"r"),
+		dstFile = fs.openSync(dstPath,"w"),
+		bytesRead = 1,
+		pos = 0;
+	while (bytesRead > 0) {
+		bytesRead = fs.readSync(srcFile,fileBuffer,0,FILE_BUFFER_LENGTH,pos);
+		fs.writeSync(dstFile,fileBuffer,0,bytesRead);
+		pos += bytesRead;
+	}
+	fs.closeSync(srcFile);
+	fs.closeSync(dstFile);
+	return null;
+}
+
+/*
+Remove trailing path separator
+*/
+exports.removeTrailingSeparator = function(dirPath) {
+	var len = dirPath.length;
+	if(dirPath.charAt(len-1) === path.sep) {
+		dirPath = dirPath.substr(0,len-1);
+	}
+	return dirPath;
+};
+
+/*
+Recursively create a directory
+*/
+exports.createDirectory = function(dirPath) {
+	var parts = dirPath.split(path.sep);
+	for(var component=0; component<parts.length; component++) {
+		var subDirPath = parts.slice(0,component+1).join(path.sep);
+		if(!$tw.utils.isDirectory(subDirPath)) {
+			try {
+				fs.mkdirSync(subDirPath);
+			} catch(e) {
+				return "Error creating directory '" + subDirPath + "'";
+			}
+		}
+	}
+	return null;
+};
+
+/*
+Check if a path identifies a directory
+*/
+exports.isDirectory = function(dirPath) {
+	return fs.existsSync(dirPath) && fs.statSync(dirPath).isDirectory();
+};
+
+})();