From dd4c0c633a103c13b144d6d62c450f36a1784540 Mon Sep 17 00:00:00 2001
From: oleg <oleg.korobenko@gmail.com>
Date: Mon, 14 Mar 2016 21:29:57 +0300
Subject: [PATCH] expose scm

---
 lib/scm/index.js | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/scm/index.js b/lib/scm/index.js
index 89d0ddc..f68bb6e 100644
--- a/lib/scm/index.js
+++ b/lib/scm/index.js
@@ -1,6 +1,23 @@
 'use strict';
 
+var BaseScm = require('./base').Scm;
+
+exports.BaseScm = BaseScm;
+
+var constructors = {
+	git: require('./git').Scm,
+	mercurial: require('./mercurial').Scm
+};
+
+exports.register = function(type, constructor) {
+	constructors[type] = constructor;
+};
+
 exports.createScm = function(params) {
-	var Constructor = require('./' + params.type).Scm;
+	if (params.type in constructors === false) {
+		throw new Error('Unknown scm type: ' + params.type);
+	}
+
+	var Constructor = constructors[params.type];
 	return new Constructor(params);
 };