Fix for - Running func new in an empty directory creates incorrect fi…

src/Cli/func/Actions/LocalActions/CreateFunctionAction.cs

@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
 using System.Text.RegularExpressions;
@@ -110,9 +110,9 @@ public override async Task RunAsync()
                 return;
             }
 
-            // Ensure that the _templates are loaded before we proceed
             _templates = await _templatesManager.Templates;
 
+            // Ensure that the worker runtime and language are set.
             await UpdateLanguageAndRuntime();
 
             // Depends on UpdateLanguageAndRuntime to set 'Language'

src/Cli/func/Actions/LocalActions/InitAction.cs

@@ -277,6 +277,7 @@ private static string LanguageSelectionIfRelevant(WorkerRuntime workerRuntime)
                 || workerRuntime == Helpers.WorkerRuntime.DotnetIsolated
                 || workerRuntime == Helpers.WorkerRuntime.Dotnet)
             {
+                DeleteOrOverwriteHostJsonIfOnlyFile();
                 if (WorkerRuntimeLanguageHelper.WorkerToSupportedLanguages.TryGetValue(workerRuntime, out IEnumerable<string> languages)
                     && languages.Count() != 0)
                 {
@@ -643,5 +644,16 @@ private async Task ShowEolMessage()
                 // ignore. Failure to show the EOL message should not fail the init command.
             }
         }
+
+        public static void DeleteOrOverwriteHostJsonIfOnlyFile()
+        {
+            var currentDir = Environment.CurrentDirectory;
+            var files = Directory.GetFiles(currentDir);
+            if (files.Length == 1 && string.Equals(Path.GetFileName(files[0]), "host.json", StringComparison.OrdinalIgnoreCase))
+            {
+                // Delete the host.json file
+                File.Delete(files[0]);
+            }
+        }
     }
 }

test/Cli/Func.UnitTests/InitActionHostJsonTests.cs

@@ -0,0 +1,51 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using Azure.Functions.Cli.Actions.LocalActions;
+using Xunit;
+
+namespace Func.UnitTests.ActionsTests
+{
+    public class InitActionHostJsonTests
+    {
+        private readonly string _testDir;
+
+        public InitActionHostJsonTests()
+        {
+            _testDir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
+            Directory.CreateDirectory(_testDir);
+            Directory.SetCurrentDirectory(_testDir);
+        }
+
+        [Fact]
+        public void DeleteOrOverwriteHostJsonIfOnlyFile_DeletesHostJson_WhenOnlyFilePresent()
+        {
+            // Arrange
+            var hostJsonPath = Path.Combine(_testDir, "host.json");
+            File.WriteAllText(hostJsonPath, "{ \"test\": true }");
+
+            // Act
+            InitAction.DeleteOrOverwriteHostJsonIfOnlyFile();
+
+            // Assert
+            Assert.False(File.Exists(hostJsonPath));
+        }
+
+        [Fact]
+        public void DeleteOrOverwriteHostJsonIfOnlyFile_DoesNotDeleteHostJson_WhenOtherFilesPresent()
+        {
+            // Arrange
+            var hostJsonPath = Path.Combine(_testDir, "host.json");
+            var otherFilePath = Path.Combine(_testDir, "other.txt");
+            File.WriteAllText(hostJsonPath, "{ \"test\": true }");
+            File.WriteAllText(otherFilePath, "other");
+
+            // Act
+            InitAction.DeleteOrOverwriteHostJsonIfOnlyFile();
+
+            // Assert
+            Assert.True(File.Exists(hostJsonPath));
+            Assert.True(File.Exists(otherFilePath));
+        }
+    }
+}