winui: extract cmdline util methods

Extract shared command line parsing methods used in Windows UI helpers.

Author: mjcheetham

src/windows/GitHub.UI.Windows/Program.cs

@@ -36,9 +36,9 @@ public static void Main(string[] args)
 
                     if (StringComparer.OrdinalIgnoreCase.Equals(args[0], "prompt"))
                     {
-                        string enterpriseUrl = GetParameter(args, "--enterprise-url");
-                        bool basic = TryGetSwitch(args, "--basic");
-                        bool oauth = TryGetSwitch(args, "--oauth");
+                        string enterpriseUrl = CommandLineUtils.GetParameter(args, "--enterprise-url");
+                        bool basic = CommandLineUtils.TryGetSwitch(args, "--basic");
+                        bool oauth = CommandLineUtils.TryGetSwitch(args, "--oauth");
 
                         if (!basic && !oauth)
                         {
@@ -71,7 +71,7 @@ public static void Main(string[] args)
                     }
                     else if (StringComparer.OrdinalIgnoreCase.Equals(args[0], "2fa"))
                     {
-                        bool isSms = TryGetSwitch(args, "--sms");
+                        bool isSms = CommandLineUtils.TryGetSwitch(args, "--sms");
 
                         if (!prompts.ShowAuthenticationCodePrompt(isSms, out string authCode))
                         {
@@ -111,22 +111,5 @@ private static bool TryGetParentWindowHandle(out IntPtr hwnd)
             hwnd = default(IntPtr);
             return false;
         }
-
-        private static bool TryGetSwitch(string[] args, string name)
-        {
-            return args.Any(arg => StringComparer.OrdinalIgnoreCase.Equals(arg, name));
-        }
-
-        private static string GetParameter(string[] args, string name)
-        {
-            int index = Array.FindIndex(args, x => StringComparer.OrdinalIgnoreCase.Equals(x, name));
-
-            if (-1 < index && index + 1 < args.Length)
-            {
-                return args[index + 1];
-            }
-
-            return null;
-        }
     }
 }

src/windows/Shared.UI.Windows/CommandLineUtils.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+using System;
+using System.Linq;
+
+namespace Microsoft.Git.CredentialManager.UI
+{
+    public static class CommandLineUtils
+    {
+        public static bool TryGetSwitch(string[] args, string name)
+        {
+            return args.Any(arg => StringComparer.OrdinalIgnoreCase.Equals(arg, name));
+        }
+
+        public static string GetParameter(string[] args, string name)
+        {
+            int index = Array.FindIndex(args, x => StringComparer.OrdinalIgnoreCase.Equals(x, name));
+
+            if (-1 < index && index + 1 < args.Length)
+            {
+                return args[index + 1];
+            }
+
+            return null;
+        }
+    }
+}