load projects config using reader

lib/project.js

@@ -3,7 +3,8 @@
 var Steppy = require('twostep').Steppy,
 	fs = require('fs'),
 	path = require('path'),
-	_ = require('underscore');
+	_ = require('underscore'),
+	reader = require('./reader');
 
 function Project(config) {
 	this.config = config;
@@ -26,9 +27,6 @@ exports.load = function(baseDir, name, callback) {
 			fs.readdir(dir, this.slot());
 		},
 		function(err, dirContent) {
-			if (dirContent.indexOf('config.json') === -1) throw new Error(
-				'config.json is not found at project dir ' + dir
-			);
 			exports.loadConfig(dir, this.slot());
 		},
 		function(err, config) {
@@ -61,21 +59,9 @@ exports.loadAll = function(baseDir, callback) {
 };
 
 exports.loadConfig = function(dir, callback) {
-	var configPath = path.join(dir, 'config.json');
 	Steppy(
 		function() {
-			fs.readFile(configPath, 'utf8', this.slot());
-		},
-		function(err, configText) {
-			try {
-				this.pass(JSON.parse(configText));
-			} catch(error) {
-				error.message = (
-					'Error while parsing json from config ' +
-					configPath + ': ' + error.message
-				);
-				throw error;
-			}
+			reader.load(dir, 'config', this.slot());
 		},
 		callback
 	);

lib/reader/base.js

@@ -0,0 +1,27 @@
+'use strict';
+
+var Steppy = require('twostep').Steppy;
+
+function Reader() {
+}
+
+exports.Reader = Reader;
+
+Reader.prototype.load = function(dir, name, callback) {
+	var self = this;
+	Steppy(
+		function() {
+			self._load(dir, name, this.slot());
+		},
+		function(err, content) {
+			if (err) {
+				err.message = 'Error while loading "' + name + '" from "' + dir +
+				'": \n' + err.message;
+			}
+			callback(err, content);
+		}
+	);
+};
+
+Reader.prototype._load = function(dir, name, callback) {
+};

lib/reader/index.js

@@ -0,0 +1,44 @@
+'use strict';
+
+var Steppy = require('twostep').Steppy,
+	_ = require('underscore'),
+	fs = require('fs'),
+	path = require('path');
+
+var constructors = {
+	json: require('./json').Reader
+};
+
+exports.register = function(ext, constructor) {
+	constructors[ext] = constructor;
+};
+
+exports.load = function(dir, name, callback) {
+	Steppy(
+		function() {
+			fs.readdir(dir, this.slot());
+		},
+		function(err, filePaths) {
+			var ext;
+			var filePath = _(filePaths).find(function(filePath) {
+				ext = path.extname(filePath).replace(/^\./, '');
+				return (
+					ext in constructors &&
+					path.basename(filePath, '.' + ext) === name
+				);
+			});
+
+			if (filePath) {
+				var Constructor = constructors[ext],
+					reader = new Constructor();
+				reader.load(dir, name, this.slot());
+			} else {
+				throw new Error(
+					'Can`t load "' + name + '" from "' + dir + '" using ' +
+					'readers: ' + _(constructors).keys().join(', ')
+				);
+			}
+		},
+		callback
+	);
+};

lib/reader/json.js

@@ -0,0 +1,21 @@
+'use strict';
+
+var inherits = require('util').inherits,
+	ParentReader = require('./base').Reader,
+	path = require('path');
+
+
+function Reader() {
+	ParentReader.call(this);
+}
+
+inherits(Reader, ParentReader);
+
+exports.Reader = Reader;
+
+Reader.prototype.ext = 'json';
+
+Reader.prototype._load = function(dir, name, callback) {
+	var content = require(path.join(dir, name + '.' + this.ext));
+	callback(null, content);
+};