Move multi; commands; createClient code into separate files

lib/createClient.js

@@ -0,0 +1,67 @@
+'use strict';
+
+var utils = require('./utils');
+var URL = require('url');
+
+module.exports = function createClient (port_arg, host_arg, options) {
+
+    if (typeof port_arg === 'number' || typeof port_arg === 'string' && /^\d+$/.test(port_arg)) {
+
+        var host;
+        if (typeof host_arg === 'string') {
+            host = host_arg;
+        } else {
+            options = options || host_arg;
+        }
+        options = utils.clone(options);
+        options.host = host || options.host;
+        options.port = port_arg;
+
+    } else if (typeof port_arg === 'string' || port_arg && port_arg.url) {
+
+        options = utils.clone(port_arg.url ? port_arg : host_arg || options);
+        var parsed = URL.parse(port_arg.url || port_arg, true, true);
+
+        // [redis:]//[[user][:password]@][host][:port][/db-number][?db=db-number[&password=bar[&option=value]]]
+        if (parsed.hostname || parsed.slashes) { // The host might be an empty string
+            if (parsed.auth) {
+                options.password = parsed.auth.split(':')[1];
+            }
+            if (!/^([a-z]+:)?\/\//i.test(parsed.href)) {
+                throw new Error('Connection string must use the "redis:" protocol or begin with slashes //');
+            }
+            if (parsed.pathname && parsed.pathname !== '/') {
+                options.db = parsed.pathname.substr(1);
+            }
+            options.host = parsed.hostname;
+            options.port = parsed.port;
+
+            if (parsed.search !== '') {
+                var elem;
+                for (elem in parsed.query) { // jshint ignore: line
+                    // If options are passed twice, only the parsed options will be used
+                    if (elem in options) {
+                        if (options[elem] === parsed.query[elem]) {
+                            console.warn('node_redis: WARNING: You passed the ' + elem + ' option twice!');
+                        } else {
+                            throw new Error('The ' + elem + ' option is added twice and does not match');
+                        }
+                    }
+                    options[elem] = parsed.query[elem];
+                }
+            }
+        } else {
+            options.path = port_arg;
+        }
+
+    } else if (typeof port_arg === 'object' || port_arg === undefined) {
+        options = utils.clone(port_arg || options);
+        options.host = options.host || host_arg;
+    }
+
+    if (!options) {
+        throw new Error('Unknown type of connection in createClient()');
+    }
+
+    return options;
+};