sln-add: Add --include-references option

Update option name

Author: edvilme

src/Cli/dotnet/Commands/CliCommandStrings.resx

@@ -2483,4 +2483,7 @@ To display a value, specify the corresponding command-line option without provid
   <data name="ZeroTestsRan" xml:space="preserve">
     <value>Zero tests ran</value>
   </data>
-</root>
+  <data name="SolutionAddReferencedProjectsOptionDescription" xml:space="preserve">
+    <value>Recursively add projects' ReferencedProjects to solution</value>
+  </data>
+</root>

src/Cli/dotnet/Commands/Solution/Add/SolutionAddCommand.cs

@@ -20,6 +20,7 @@ internal class SolutionAddCommand : CommandBase
     private readonly IReadOnlyCollection<string> _projects;
     private readonly string? _solutionFolderPath;
     private string _solutionFileFullPath = string.Empty;
+    private bool _addReferencedProjects;
 
     private static string GetSolutionFolderPathWithForwardSlashes(string path)
     {
@@ -41,6 +42,7 @@ public SolutionAddCommand(ParseResult parseResult) : base(parseResult)
         _projects = (IReadOnlyCollection<string>)(parseResult.GetValue(SolutionAddCommandParser.ProjectPathArgument) ?? []);
         _inRoot = parseResult.GetValue(SolutionAddCommandParser.InRootOption);
         _solutionFolderPath = parseResult.GetValue(SolutionAddCommandParser.SolutionFolderOption);
+        _addReferencedProjects = parseResult.GetValue(SolutionAddCommandParser.AddReferencedProjectsOption);
         SolutionArgumentValidator.ParseAndValidateArguments(_fileOrDirectory, _projects, SolutionArgumentValidator.CommandType.Add, _inRoot, _solutionFolderPath);
         _solutionFileFullPath = SlnFileFactory.GetSolutionFileFullPath(_fileOrDirectory);
     }
@@ -195,6 +197,21 @@ private void AddProject(SolutionModel solution, string fullProjectPath, ISolutio
             project.AddProjectConfigurationRule(new ConfigurationRule(BuildDimension.BuildType, solutionBuildType, "*", projectBuildType));
         }
 
+        // Get referencedprojects from the project instance
+        var referencedProjectsFullPaths = projectInstance.EvaluatedItemElements
+            .Where(item => item.ItemType == "ProjectReference")
+            .Select(item => item.Include)
+            .Select(item => Path.GetFullPath(item, Path.GetDirectoryName(fullProjectPath)))
+            .ToList();
+
         Reporter.Output.WriteLine(CliStrings.ProjectAddedToTheSolution, solutionRelativeProjectPath);
+
+        if (_addReferencedProjects)
+        {
+            foreach (var referencedProjectFullPath in referencedProjectsFullPaths)
+            {
+                AddProject(solution, referencedProjectFullPath, serializer);
+            }
+        }
     }
 }

src/Cli/dotnet/Commands/Solution/Add/SolutionAddCommandParser.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.CommandLine;
+using System.CommandLine.Parsing;
 
 namespace Microsoft.DotNet.Cli.Commands.Solution.Add;
 
@@ -24,6 +25,12 @@ public static class SolutionAddCommandParser
         Description = CliCommandStrings.AddProjectSolutionFolderArgumentDescription
     };
 
+    public static readonly Option<bool> AddReferencedProjectsOption = new("--include-references")
+    {
+        Description = CliCommandStrings.SolutionAddReferencedProjectsOptionDescription,
+        DefaultValueFactory = (_) => true,
+    };
+
     private static readonly Command Command = ConstructCommand();
 
     public static Command GetCommand()
@@ -38,6 +45,7 @@ private static Command ConstructCommand()
         command.Arguments.Add(ProjectPathArgument);
         command.Options.Add(InRootOption);
         command.Options.Add(SolutionFolderOption);
+        command.Options.Add(AddReferencedProjectsOption);
 
         command.SetAction((parseResult) => new SolutionAddCommand(parseResult).Execute());