Just test for existing directory on creation view.

Rather than .git/HEAD

Author: grokys

src/GitHub.App/ViewModels/RepositoryCreationViewModel.cs

@@ -253,23 +253,11 @@ bool IsAlreadyRepoAtPath(string potentialRepositoryName)
                 if (Path.GetInvalidPathChars().Any(chr => BaseRepositoryPath.Contains(chr)))
                     return false;
                 string potentialPath = Path.Combine(BaseRepositoryPath, safeRepositoryName);
-                isAlreadyRepoAtPath = IsGitRepo(potentialPath);
+                isAlreadyRepoAtPath = operatingSystem.Directory.Exists(potentialPath);
             }
             return isAlreadyRepoAtPath;
         }
 
-        bool IsGitRepo(string path)
-        {
-            try
-            {
-                return operatingSystem.File.Exists(Path.Combine(path, ".git", "HEAD"));
-            }
-            catch (PathTooLongException)
-            {
-                return false;
-            }
-        }
-
         IObservable<Unit> OnCreateRepository(object state)
         {
             var newRepository = GatherRepositoryInfo();

src/UnitTests/GitHub.App/ViewModels/RepositoryCreationViewModelTests.cs

@@ -283,7 +283,7 @@ public void IsFalseWhenRepositoryAlreadyExists(bool exists, bool expected)
         {
             var provider = Substitutes.ServiceProvider;
             var operatingSystem = provider.GetOperatingSystem();
-            operatingSystem.File.Exists(@"c:\fake\foo\.git\HEAD").Returns(exists);
+            operatingSystem.Directory.Exists(@"c:\fake\foo").Returns(exists);
             var vm = GetMeAViewModel(provider);
             vm.BaseRepositoryPath = @"c:\fake\";