Introduce savetiddlers command

Allows us to save tiddlers in their raw format.

core/language/en-GB/Help/savetiddlers.tid

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+title: $:/language/Help/savetiddlers
+description: Saves a raw tiddler to a file
+
+Saves a group of tiddlers in their raw text or binary format to the specified directory. 
+
+```
+--savetiddlers <filter> <pathname>
+```
+
+By default, the filename is resolved relative to the `output` subdirectory of the edition directory. The `--output` command can be used to direct output to a different directory.
+
+Any missing directories in the pathname are automatically created.

core/modules/commands/savetiddlers.js

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+/*\
+title: $:/core/modules/commands/savetiddlers.js
+type: application/javascript
+module-type: command
+
+Command to save several tiddlers to a folder of files
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var widget = require("$:/core/modules/widgets/widget.js");
+
+exports.info = {
+	name: "savetiddlers",
+	synchronous: true
+};
+
+var Command = function(params,commander,callback) {
+	this.params = params;
+	this.commander = commander;
+	this.callback = callback;
+};
+
+Command.prototype.execute = function() {
+	if(this.params.length < 1) {
+		return "Missing filename";
+	}
+	var self = this,
+		fs = require("fs"),
+		path = require("path"),
+		wiki = this.commander.wiki,
+		filter = this.params[0],
+		pathname = path.resolve(this.commander.outputPath,this.params[1]),
+		tiddlers = wiki.filterTiddlers(filter);
+	$tw.utils.deleteDirectory(pathname);
+	$tw.utils.createDirectory(pathname);
+	$tw.utils.each(tiddlers,function(title) {
+		var tiddler = self.commander.wiki.getTiddler(title),
+			type = tiddler.fields.type || "text/vnd.tiddlywiki",
+			contentTypeInfo = $tw.config.contentTypeInfo[type] || {encoding: "utf8"},
+			filename = path.resolve(pathname,encodeURIComponent(title));
+		fs.writeFileSync(filename,tiddler.fields.text,contentTypeInfo.encoding);
+	});
+	return null;
+};
+
+exports.Command = Command;
+
+})();

editions/tw5.com/tiddlers/commands/SaveTiddlersCommand.tid

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+title: SaveTiddlersCommand
+tags: command
+created: 20140609121606089
+modified: 20140609121606089
+
+{{$:/language/Help/savetiddler}}