Initial version of hot-reload of config, menus, and prompts

* Themes use ES6 Map vs object{}
* Re-write and re-enable config cache using sane
* Events sent for config, prompt, or menu changes
* Event sent for theme changes
* Theme (or parent menu/prompt) changes cause re-merge and updates to connected clients

core/config_util.js

@@ -1,18 +1,65 @@
 /* jslint node: true */
 'use strict';
-const Config	= require('./config.js').config;
-const configCache			= require('./config_cache.js');
-const paths				= require('path');
 
+const Config			= require('./config.js').config;
+const ConfigCache		= require('./config_cache.js');
+const Events			= require('./events.js');
+
+//	deps
+const paths				= require('path');
+const async				= require('async');
+
+exports.init			= init;
 exports.getFullConfig	= getFullConfig;
 
-function getFullConfig(filePath, cb) {
+function getConfigPath(filePath) {
 	//	|filePath| is assumed to be in the config path if it's only a file name
 	if('.' === paths.dirname(filePath)) {
 		filePath = paths.join(Config.paths.config, filePath);
 	}
+	return filePath;
+}
 
-	configCache.getConfig(filePath, function loaded(err, configJson) {
-		cb(err, configJson);
+function init(cb) {
+	//	pre-cache menu.hjson and prompt.hjson + establish events
+	const changed = ( { fileName, fileRoot } ) => {
+		const reCachedPath = paths.join(fileRoot, fileName);
+		if(reCachedPath === getConfigPath(Config.general.menuFile)) {
+			Events.emit(Events.getSystemEvents().MenusChanged);
+		} else if(reCachedPath === getConfigPath(Config.general.promptFile)) {
+			Events.emit(Events.getSystemEvents().PromptsChanged);
+		}
+	};
+
+	async.series(
+		[
+			function menu(callback) {
+				return ConfigCache.getConfigWithOptions(
+					{
+						filePath : getConfigPath(Config.general.menuFile),
+						callback : changed,
+					},
+					callback
+				);
+			},
+			function prompt(callback) {
+				return ConfigCache.getConfigWithOptions(
+					{
+						filePath : getConfigPath(Config.general.promptFile),
+						callback : changed,
+					},
+					callback
+				);
+			}
+		],
+		err => {
+			return cb(err);
+		}
+	);
+}
+
+function getFullConfig(filePath, cb) {
+	ConfigCache.getConfig(getConfigPath(filePath), (err, config) => {
+		return cb(err, config);
 	});
-}
+}