refactoring code using now async

lib/identify.js

@@ -0,0 +1,38 @@
+var fs = require('fs');
+var async = require('async');
+
+var isGit = function(cb) {
+  fs.exists(folder+'.git', function(exists) {
+		if (exists)
+			return cb('git');
+    return cb(null);
+  });
+}
+
+var isHg = function(cb) {
+  fs.exists(folder+'.hg', function(exists) {
+		if (exists)
+			return cb('hg');
+    return cb(null);
+  });
+}
+
+var isSvn = function(cb) {
+  fs.exists(folder+'.svn', function(exists) {
+		if (exists)
+			return cb('svn');
+    return cb(null);
+  });
+}
+
+module.exports = function identify(folder, cb) {
+  if (folder[folder.length - 1] !== '/')
+    folder += '/';
+
+  async.series([isGit, isHg, isSvn],
+  function(err, results) {
+    if (err)
+      return cb(err);
+    return cb('No versioning system found');
+  });
+}

lib/vizion.js

@@ -1,34 +1,22 @@
-var fs = require("fs");
 var parseHg = require('./hg.js');
 var parseGit = require('./git.js');
 var parseSvn = require('./svn.js');
+var identify = require('./identify.js');
 
-module.exports.analyze = function analyze(argv, cb) {
+module.exports.analyze = function(argv, cb) {
 	folder = (argv.folder != undefined) ? argv.folder : '.';
 
-  if (folder[folder.length - 1] !== '/') {
-    folder = folder + '/';
-  }
-
-  fs.exists(folder+'.git', function(exists) {
-		if (exists) {
-			return parseGit(folder, cb);
-		}
-    fs.exists(folder+'.hg', function(exists) {
-		  if (exists) {
-			  return parseHg(folder, cb);
-		  }
-      fs.exists(folder+'.svn', function(exists) {
-		    if (exists) {
-			    return parseSvn(folder, cb);
-		    }
-        else {
-          return cb({
-            msg : 'No versioning system found',
-            path : folder
-          });
-        }
-	    });
-	  });
-	});
+  identify(folder, function(type) {
+    if (type === 'git')
+      return parseGit(folder, cb);
+    else if (type === 'hg')
+      return parseHg(folder, cb);
+    else if (type === 'svn')
+      return parseSvn(folder, cb);
+    else
+      return cb({
+        msg : type,
+        path : folder
+      });
+  });
 }