sln-list: Support for slnx (#44537)

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

@@ -183,4 +183,10 @@
   <data name="SlnxGenerated" xml:space="preserve">
     <value>.slnx file {0} generated.</value>
   </data>
+  <data name="CannotMigrateSlnx" xml:space="preserve">
+    <value>Only .sln files can be migrated to .slnx format.</value>
+  </data>
+  <data name="SerializerNotFound" xml:space="preserve">
+    <value>Could not read solution file {0}. Supported files are .sln and .slnx valid solutions.</value>
+  </data>
 </root>

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

@@ -4,6 +4,8 @@
 using System.CommandLine;
 using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.Tools;
+using Microsoft.VisualStudio.SolutionPersistence;
+using Microsoft.VisualStudio.SolutionPersistence.Serializer;
 using NuGet.Packaging;
 using LocalizableStrings = Microsoft.DotNet.Tools.Sln.LocalizableStrings;
 
@@ -50,11 +52,13 @@ internal static string GetSlnFileFullPath(string slnFileOrDirectory)
         {
             if (File.Exists(slnFileOrDirectory))
             {
-                return slnFileOrDirectory;
+                return Path.GetFullPath(slnFileOrDirectory);
             }
             if (Directory.Exists(slnFileOrDirectory))
             {
-                var files = Directory.GetFiles(slnFileOrDirectory, "*.sln", SearchOption.TopDirectoryOnly);
+                string[] files = [
+                    ..Directory.GetFiles(slnFileOrDirectory, "*.sln", SearchOption.TopDirectoryOnly),
+                    ..Directory.GetFiles(slnFileOrDirectory, "*.slnx", SearchOption.TopDirectoryOnly)];
                 if (files.Length == 0)
                 {
                     throw new GracefulException(CommonLocalizableStrings.CouldNotFindSolutionIn, slnFileOrDirectory);
@@ -63,9 +67,19 @@ internal static string GetSlnFileFullPath(string slnFileOrDirectory)
                 {
                     throw new GracefulException(CommonLocalizableStrings.MoreThanOneSolutionInDirectory, slnFileOrDirectory);
                 }
-                return files.Single().ToString();
+                return Path.GetFullPath(files.Single());
             }
             throw new GracefulException(CommonLocalizableStrings.CouldNotFindSolutionOrDirectory, slnFileOrDirectory);
         }
+
+        internal static ISolutionSerializer GetSolutionSerializer(string solutionFilePath)
+        {
+            ISolutionSerializer? serializer = SolutionSerializers.GetSerializerByMoniker(solutionFilePath);
+            if (serializer is null)
+            {
+                throw new GracefulException(LocalizableStrings.SerializerNotFound, solutionFilePath);
+            }
+            return serializer;
+        }
     }
 }

src/Cli/dotnet/commands/dotnet-sln/list/Program.cs

@@ -5,7 +5,9 @@
 using Microsoft.DotNet.Cli;
 using Microsoft.DotNet.Cli.Sln.Internal;
 using Microsoft.DotNet.Cli.Utils;
-using Microsoft.DotNet.Tools.Common;
+using Microsoft.VisualStudio.SolutionPersistence;
+using Microsoft.VisualStudio.SolutionPersistence.Model;
+using CommandLocalizableStrings = Microsoft.DotNet.Tools.CommonLocalizableStrings;
 
 namespace Microsoft.DotNet.Tools.Sln.List
 {
@@ -23,25 +25,36 @@ public ListProjectsInSolutionCommand(
 
         public override int Execute()
         {
-            var slnFile = SlnFileFactory.CreateFromFileOrDirectory(_fileOrDirectory);
+            string solutionFileFullPath = SlnCommandParser.GetSlnFileFullPath(_fileOrDirectory);
+            try
+            {
+                ListAllProjectsAsync(solutionFileFullPath, CancellationToken.None).Wait();
+                return 0;
+            }
+            catch (Exception ex)
+            {
+                throw new GracefulException(CommandLocalizableStrings.InvalidSolutionFormatString, solutionFileFullPath, ex.Message);
+            }
+        }
 
+        private async Task ListAllProjectsAsync(string solutionFileFullPath, CancellationToken cancellationToken)
+        {
+            ISolutionSerializer serializer = SlnCommandParser.GetSolutionSerializer(solutionFileFullPath);
+            SolutionModel solution = await serializer.OpenAsync(solutionFileFullPath, cancellationToken);
             string[] paths;
-
             if (_displaySolutionFolders)
             {
-                paths = slnFile.Projects
-                    .GetProjectsByType(ProjectTypeGuids.SolutionFolderGuid)
-                    .Select(folder => folder.GetFullSolutionFolderPath())
+                paths = solution.SolutionFolders
+                    // VS-SolutionPersistence does not return a path object, so there might be issues with forward/backward slashes on different platforms
+                    .Select(folder => Path.GetDirectoryName(folder.Path.TrimStart("/")))
                     .ToArray();
             }
             else
             {
-                paths = slnFile.Projects
-                    .GetProjectsNotOfType(ProjectTypeGuids.SolutionFolderGuid)
+                paths = solution.SolutionProjects
                     .Select(project => project.FilePath)
                     .ToArray();
             }
-
             if (paths.Length == 0)
             {
                 Reporter.Output.WriteLine(CommonLocalizableStrings.NoProjectsFound);
@@ -51,14 +64,14 @@ public override int Execute()
                 Array.Sort(paths);
 
                 string header = _displaySolutionFolders ? LocalizableStrings.SolutionFolderHeader : LocalizableStrings.ProjectsHeader;
-                Reporter.Output.WriteLine($"{header}");
+                Reporter.Output.WriteLine(header);
                 Reporter.Output.WriteLine(new string('-', header.Length));
                 foreach (string slnProject in paths)
                 {
                     Reporter.Output.WriteLine(slnProject);
                 }
             }
-            return 0;
+
         }
     }
 }

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

@@ -14,6 +14,7 @@
 using Microsoft.VisualStudio.SolutionPersistence.Model;
 using Microsoft.VisualStudio.SolutionPersistence.Serializer;
 using LocalizableStrings = Microsoft.DotNet.Tools.Sln.LocalizableStrings;
+using Microsoft.DotNet.Tools.Common;
 
 namespace Microsoft.DotNet.Cli
 {
@@ -26,13 +27,17 @@ public SlnMigrateCommand(
             IReporter reporter = null)
             : base(parseResult)
         {
-            _slnFileOrDirectory = Path.GetFullPath(parseResult.GetValue(SlnCommandParser.SlnArgument));
+            _slnFileOrDirectory = parseResult.GetValue(SlnCommandParser.SlnArgument);
             _reporter = reporter ?? Reporter.Output;
         }
 
         public override int Execute()
         {
             string slnFileFullPath = SlnCommandParser.GetSlnFileFullPath(_slnFileOrDirectory);
+            if (slnFileFullPath.HasExtension(".slnx"))
+            {
+                throw new GracefulException(LocalizableStrings.CannotMigrateSlnx);
+            }
             string slnxFileFullPath = Path.ChangeExtension(slnFileFullPath, "slnx");
             try
             {
@@ -45,12 +50,7 @@ public override int Execute()
 
         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);
-            }
+            ISolutionSerializer serializer = SlnCommandParser.GetSolutionSerializer(filePath);
             SolutionModel solution = await serializer.OpenAsync(filePath, cancellationToken);
             await SolutionSerializers.SlnXml.SaveAsync(slnxFilePath, solution, cancellationToken);
             _reporter.WriteLine(LocalizableStrings.SlnxGenerated, slnxFilePath);