Fix tye init --force (dotnet#896)

activate.ps1

@@ -13,7 +13,7 @@ if ($MyInvocation.CommandOrigin -eq 'runspace') {
 
 function dtye() {
     $ProjectPath = Join-Path (Join-Path $PSScriptRoot "src") "tye"
-    dotnet run --project "$ProjectPath" @args
+    dotnet run --project "$ProjectPath" -- @args
 }
 
 function deactivate ([switch]$init) {

src/Microsoft.Tye.Core/ConfigFileFinder.cs

@@ -10,9 +10,10 @@ public class ConfigFileFinder
     {
         private static readonly string[] FileFormats = { "tye.yaml", "tye.yml", "docker-compose.yaml", "docker-compose.yml", "*.csproj", "*.fsproj", "*.sln" };
 
-        public static bool TryFindSupportedFile(string directoryPath, out string? filePath, out string? errorMessage)
+        public static bool TryFindSupportedFile(string directoryPath, out string? filePath, out string? errorMessage, string[]? fileFormats = null)
         {
-            foreach (var format in FileFormats)
+            fileFormats ??= FileFormats;
+            foreach (var format in fileFormats)
             {
                 var files = Directory.GetFiles(directoryPath, format);
 

src/tye/InitHost.cs

@@ -23,6 +23,23 @@ public static (string, string) CreateTyeFileContent(FileInfo? path, bool force)
                 ThrowIfTyeFilePresent(path, "tye.yaml");
             }
 
+            if (force)
+            {
+                // Don't use existing tye.yaml if we are force creating it again.
+                // path prior is pointing to the tye.yaml file still, so refind another file that isn't the tye.yaml
+                var hasViableFileType = ConfigFileFinder.TryFindSupportedFile(path?.DirectoryName ?? ".",
+                    out var filePath,
+                    out var errorMessage,
+                    new string[] { "*.csproj", "*.fsproj", "*.sln" });
+
+                if (!hasViableFileType)
+                {
+                    throw new CommandException(errorMessage!);
+                }
+
+                path = new FileInfo(filePath);
+            }
+
             var template = @"
 # tye application configuration file
 # read all about it at https://github.com/dotnet/tye

test/E2ETest/TyeInitTests.cs

@@ -89,5 +89,20 @@ public void Console_Normalization_Service_Name()
 
             YamlAssert.Equals(expectedContent, content);
         }
+
+        [Fact]
+        public void Tye_Init_Force_Works()
+        {
+            using var projectDirectory = CopyTestProjectDirectory("single-project");
+            var tyePath = Path.Combine(projectDirectory.DirectoryPath, "tye.yaml");
+            var text = File.ReadAllText(tyePath);
+            File.WriteAllText(tyePath, text + "thisisatest");
+
+            var projectFile = new FileInfo(tyePath);
+
+            var (content, _) = InitHost.CreateTyeFileContent(projectFile, force: true);
+
+            Assert.DoesNotContain("thisisatest", content);
+        }
     }
 }