[ADD] dotnet solution migrate

Directory.Packages.props

@@ -1,5 +1,5 @@
 <Project>
-  <Import Project="$(RepositoryEngineeringDir)\dependabot\Packages.props" Condition="'$(RepositoryEngineeringDir)' != ''"/>
+  <Import Project="$(RepositoryEngineeringDir)\dependabot\Packages.props" Condition="'$(RepositoryEngineeringDir)' != ''" />
   <PropertyGroup>
     <!-- Using multiple feeds isn't supported by Maestro: https://github.com/dotnet/arcade/issues/14155. -->
     <NoWarn>$(NoWarn);NU1507</NoWarn>
@@ -12,7 +12,7 @@
     <PackageVersion Include="Microsoft.AspNetCore.DeveloperCertificates.XPlat" Version="$(MicrosoftAspNetCoreDeveloperCertificatesXPlatPackageVersion)" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Razor.Extensions.Tooling.Internal" Version="$(MicrosoftAspNetCoreMvcRazorExtensionsToolingInternalPackageVersion)" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="$(MicrosoftAspNetCoreTestHostPackageVersion)" />
-    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="$(MicrosoftBclAsyncInterfacesPackageVersion)"/>
+    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="$(MicrosoftBclAsyncInterfacesPackageVersion)" />
     <PackageVersion Include="Microsoft.Build.NuGetSdkResolver" Version="$(MicrosoftBuildNuGetSdkResolverPackageVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="$(MicrosoftCodeAnalysisPackageVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzer.Testing" Version="$(MicrosoftCodeAnalysisAnalyzerTestingVersion)" />
@@ -43,7 +43,7 @@
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="$(MicrosoftExtensionsLoggingVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="$(MicrosoftExtensionsLoggingAbstractionsVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="$(MicrosoftExtensionsLoggingConsoleVersion)" />
-    <PackageVersion Include="Microsoft.Extensions.ObjectPool" Version="$(MicrosoftExtensionsObjectPoolPackageVersion)"/>
+    <PackageVersion Include="Microsoft.Extensions.ObjectPool" Version="$(MicrosoftExtensionsObjectPoolPackageVersion)" />
     <PackageVersion Include="Microsoft.FSharp.Compiler" Version="$(MicrosoftFSharpCompilerPackageVersion)" />
     <PackageVersion Include="Microsoft.IO.Redist" Version="$(MicrosoftIORedistPackageVersion)" />
     <PackageVersion Include="Microsoft.Net.Compilers.Toolset.Framework" Version="$(MicrosoftNetCompilersToolsetFrameworkPackageVersion)" />
@@ -67,6 +67,7 @@
     <PackageVersion Include="Microsoft.TestPlatform.CLI" Version="$(MicrosoftTestPlatformCLIPackageVersion)" />
     <PackageVersion Include="Microsoft.VisualStudio.Composition" Version="17.4.16" />
     <PackageVersion Include="Microsoft.VisualStudio.Setup.Configuration.Interop" Version="$(MicrosoftVisualStudioSetupConfigurationInteropVersion)" />
+    <PackageVersion Include="Microsoft.VisualStudio.SolutionPersistence" Version="1.0.9" />
     <PackageVersion Include="Microsoft.Web.Deployment" Version="$(WebDeploymentPackageVersion)" />
     <PackageVersion Include="Microsoft.Web.Xdt" Version="$(MicrosoftWebXdtPackageVersion)" />
     <PackageVersion Include="Microsoft.Win32.SystemEvents" Version="$(MicrosoftWin32SystemEventsPackageVersion)" />
@@ -95,11 +96,11 @@
     <PackageVersion Include="System.CommandLine" Version="$(SystemCommandLineVersion)" />
     <PackageVersion Include="System.CommandLine.Rendering" Version="$(SystemCommandLineRenderingVersion)" />
     <PackageVersion Include="System.ComponentModel.TypeConverter" Version="4.3.0" />
-    <PackageVersion Include="System.Composition.AttributedModel" Version="$(SystemCompositionAttributedModelPackageVersion)"/>
-    <PackageVersion Include="System.Composition.Convention" Version="$(SystemCompositionConventionPackageVersion)"/>
-    <PackageVersion Include="System.Composition.Hosting" Version="$(SystemCompositionHostingPackageVersion)"/>
-    <PackageVersion Include="System.Composition.Runtime" Version="$(SystemCompositionRuntimePackageVersion)"/>
-    <PackageVersion Include="System.Composition.TypedParts" Version="$(SystemCompositionTypedPartsPackageVersion)"/>
+    <PackageVersion Include="System.Composition.AttributedModel" Version="$(SystemCompositionAttributedModelPackageVersion)" />
+    <PackageVersion Include="System.Composition.Convention" Version="$(SystemCompositionConventionPackageVersion)" />
+    <PackageVersion Include="System.Composition.Hosting" Version="$(SystemCompositionHostingPackageVersion)" />
+    <PackageVersion Include="System.Composition.Runtime" Version="$(SystemCompositionRuntimePackageVersion)" />
+    <PackageVersion Include="System.Composition.TypedParts" Version="$(SystemCompositionTypedPartsPackageVersion)" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="$(SystemConfigurationConfigurationManagerPackageVersion)" />
     <PackageVersion Include="System.Formats.Asn1" Version="$(SystemFormatsAsn1Version)" />
     <PackageVersion Include="System.IO.Hashing" Version="$(SystemIOHashingPackageVersion)" />
@@ -120,7 +121,7 @@
     <PackageVersion Include="Valleysoft.DockerCredsProvider" Version="2.2.1" />
     <PackageVersion Include="xunit" Version="$(XUnitVersion)" />
     <PackageVersion Include="Xunit.Combinatorial" Version="$(XunitCombinatorialVersion)" />
-    <PackageVersion Include="xunit.console" Version="$(XUnitVersion)"/>
+    <PackageVersion Include="xunit.console" Version="$(XUnitVersion)" />
   </ItemGroup>
 
   <!-- Use different versions of Microsoft.Build.* depending on whether the output will be used in

src/Cli/dotnet/commands/dotnet-sln/LocalizableStrings.resx

@@ -177,4 +177,10 @@
   <data name="SolutionFolderHeader" xml:space="preserve">
     <value>Solution Folder(s)</value>
   </data>
-</root>
+  <data name="MigrateAppFullName" xml:space="preserve">
+    <value>Generate a .slnx file from a .sln file.</value>
+  </data>
+  <data name="SlnxGenerated" xml:space="preserve">
+    <value>.slnx file {0} generated.</value>
+  </data>
+</root>

src/Cli/dotnet/commands/dotnet-sln/SlnCommandParser.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.CommandLine;
+using Microsoft.DotNet.Cli.Utils;
+using Microsoft.DotNet.Tools;
 using NuGet.Packaging;
 using LocalizableStrings = Microsoft.DotNet.Tools.Sln.LocalizableStrings;
 
@@ -37,10 +39,33 @@ private static CliCommand ConstructCommand()
             command.Subcommands.Add(SlnAddParser.GetCommand());
             command.Subcommands.Add(SlnListParser.GetCommand());
             command.Subcommands.Add(SlnRemoveParser.GetCommand());
+            command.Subcommands.Add(SlnMigrateCommandParser.GetCommand());
 
             command.SetAction((parseResult) => parseResult.HandleMissingCommand());
 
             return command;
         }
+
+        internal static string GetSlnFileFullPath(string slnFileOrDirectory)
+        {
+            if (File.Exists(slnFileOrDirectory))
+            {
+                return slnFileOrDirectory;
+            }
+            if (Directory.Exists(slnFileOrDirectory))
+            {
+                var files = Directory.GetFiles(slnFileOrDirectory, "*.sln", SearchOption.TopDirectoryOnly);
+                if (files.Length == 0)
+                {
+                    throw new GracefulException(CommonLocalizableStrings.CouldNotFindSolutionIn, slnFileOrDirectory);
+                }
+                if (files.Length > 1)
+                {
+                    throw new GracefulException(CommonLocalizableStrings.MoreThanOneSolutionInDirectory, slnFileOrDirectory);
+                }
+                return files.Single().ToString();
+            }
+            throw new GracefulException(CommonLocalizableStrings.CouldNotFindSolutionOrDirectory, slnFileOrDirectory);
+        }
     }
 }

src/Cli/dotnet/commands/dotnet-sln/migrate/SlnMigrateCommand.cs

@@ -0,0 +1,58 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.CommandLine;
+using System.Linq;
+using System.Text;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.DotNet.Cli.Utils;
+using Microsoft.DotNet.Tools;
+using Microsoft.VisualStudio.SolutionPersistence;
+using Microsoft.VisualStudio.SolutionPersistence.Model;
+using Microsoft.VisualStudio.SolutionPersistence.Serializer;
+using LocalizableStrings = Microsoft.DotNet.Tools.Sln.LocalizableStrings;
+
+namespace Microsoft.DotNet.Cli
+{
+    internal class SlnMigrateCommand : CommandBase
+    {
+        private readonly string _slnFileOrDirectory;
+        private readonly IReporter _reporter;
+        public SlnMigrateCommand(
+            ParseResult parseResult,
+            IReporter reporter = null)
+            : base(parseResult)
+        {
+            _slnFileOrDirectory = Path.GetFullPath(parseResult.GetValue(SlnCommandParser.SlnArgument));
+            _reporter = reporter ?? Reporter.Output;
+        }
+
+        public override int Execute()
+        {
+            string slnFileFullPath = SlnCommandParser.GetSlnFileFullPath(_slnFileOrDirectory);
+            string slnxFileFullPath = Path.ChangeExtension(slnFileFullPath, "slnx");
+            Task task = ConvertToSlnxAsync(slnFileFullPath, slnxFileFullPath, CancellationToken.None);
+            if (task.IsCompletedSuccessfully)
+            {
+                return 0;
+            }
+            throw new GracefulException(task.Exception.Message, task.Exception);
+        }
+
+        private async Task ConvertToSlnxAsync(string filePath, string slnxFilePath, CancellationToken cancellationToken)
+        {
+            // See if the file is a known solution file.
+            ISolutionSerializer? serializer = SolutionSerializers.GetSerializerByMoniker(filePath);
+            if (serializer is null)
+            {
+                throw new GracefulException("Could not find serializer for file {0}", filePath);
+            }
+            SolutionModel solution = await serializer.OpenAsync(filePath, cancellationToken);
+            await SolutionSerializers.SlnXml.SaveAsync(slnxFilePath, solution, cancellationToken);
+            _reporter.WriteLine(LocalizableStrings.SlnxGenerated, slnxFilePath);
+        }
+    }
+}

src/Cli/dotnet/commands/dotnet-sln/migrate/SlnMigrateCommandParser.cs

@@ -0,0 +1,30 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.CommandLine;
+using Microsoft.DotNet.Tools.Sln.Add;
+using LocalizableStrings = Microsoft.DotNet.Tools.Sln.LocalizableStrings;
+
+namespace Microsoft.DotNet.Cli
+{
+    public static class SlnMigrateCommandParser
+    {
+        private static readonly CliCommand Command = ConstructCommand();
+
+        public static CliCommand GetCommand()
+        {
+            return Command;
+        }
+
+        private static CliCommand ConstructCommand()
+        {
+            CliCommand command = new("migrate", LocalizableStrings.MigrateAppFullName);
+
+            command.Arguments.Add(SlnCommandParser.SlnArgument);
+
+            command.SetAction((parseResult) => new SlnMigrateCommand(parseResult).Execute());
+
+            return command;
+        }
+    }
+}