* New message_area.js for Message Area APIs, etc.

* msg_area_list.js module for listing/selecting message area (WIP; much to do)

core/message_area.js

@@ -0,0 +1,61 @@
+/* jslint node: true */
+'use strict';
+
+var msgDb			= require('./database.js').dbs.message;
+
+var async			= require('async');
+var _				= require('lodash');
+var assert			= require('assert');
+
+exports.getAvailableMessageAreas			= getAvailableMessageAreas;
+
+function getAvailableMessageAreas(cb) {
+	var areas = [];	//	{ areaId, name, groupIds[] }
+	
+	async.series(
+		[
+			function getAreas(callback) {
+				msgDb.all(
+					'SELECT area_id, area_name '	+ 
+					'FROM message_area;',
+					function areaResults(err, areaRows) {
+						if(err) {
+							callback(err);
+						} else {
+							areaRows.forEach(function entry(ar) {
+								areas.push( {
+									areaId		: ar.area_id,
+									name		: ar.area_name,
+								});
+							});
+
+							callback(null);
+						}
+					}
+				);
+			},
+			function getAreaGroups(callback) {
+				var query = msgDb.prepare(
+					'SELECT group_id '			+
+					'FROM message_area_group '	+
+					'WHERE area_id=?;');
+
+				async.each(areas, function area(a, next) {
+					query.all( [ a.areaId ], function groupRows(err, groups) {
+						a.groupIds = groups;
+						next(err);
+					});
+				},
+				function complete(err) {
+					query.finalize(function finalized(err2) {
+						callback(err);	//	use orig err
+					});
+				});				
+			}
+		],
+		function complete(err) {
+			cb(err, areas);
+		}
+	);
+
+}