Fix forgotten optional info section

Fixes #1003

Author: Ruben Bridgewater

lib/individualCommands.js

@@ -33,11 +33,17 @@ RedisClient.prototype.select = RedisClient.prototype.SELECT = function select (d
 };
 
 // Store info in this.server_info after each call
-RedisClient.prototype.info = RedisClient.prototype.INFO = function info (callback) {
+RedisClient.prototype.info = RedisClient.prototype.INFO = function info (section, callback) {
     var self = this;
     var ready = this.ready;
+    if (typeof section === 'function') {
+        callback = section;
+        section = 'default';
+    } else if (section === undefined) {
+        section = 'default';
+    }
     this.ready = ready || this.offline_queue.length === 0; // keep the execution order intakt
-    var tmp = this.send_command('info', [], function (err, res) {
+    var tmp = this.send_command('info', [section], function (err, res) {
         if (res) {
             var obj = {};
             var lines = res.toString().split('\r\n');

test/commands/info.spec.js

@@ -37,6 +37,22 @@ describe("The 'info' method", function () {
                 }, 150);
             });
 
+            it("works with optional section provided with and without callback", function (done) {
+                client.set('foo', 'bar');
+                client.info('keyspace');
+                client.select(2, function () {
+                    assert.strictEqual(Object.keys(client.server_info).length, 3, 'Key length should be three');
+                    assert(typeof client.server_info.db2 === 'object', 'db2 keyspace should be an object');
+                });
+                client.set('foo', 'bar');
+                client.info('all', function (err, res) {
+                    assert(Object.keys(client.server_info).length > 3, 'Key length should be way above three');
+                    assert.strictEqual(typeof client.server_info.redis_version, 'string');
+                    assert.strictEqual(typeof client.server_info.db2, 'object');
+                    done();
+                });
+            });
+
             it("emit error after a failure", function (done) {
                 client.info();
                 client.once('error', function (err) {