Introduced Fusion Export Command

src/HotChocolate/AspNetCore/src/AspNetCore.CommandLine/Command/ExportCommand.cs

@@ -1,5 +1,6 @@
 using System.CommandLine;
 using System.IO;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using HotChocolate.Execution;
@@ -51,7 +52,7 @@ private static async Task ExecuteAsync(
 
         if (output is { })
         {
-            await File.WriteAllTextAsync(output.FullName, sdl, cancellationToken);
+            await File.WriteAllTextAsync(output.FullName, sdl, Encoding.UTF8, cancellationToken);
         }
         else
         {

src/HotChocolate/Fusion/src/CommandLine/Commands/ComposeCommand.cs

@@ -1,5 +1,6 @@
 using System.CommandLine;
 using System.Diagnostics.CodeAnalysis;
+using System.IO.Packaging;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using HotChocolate.Fusion.CommandLine.Helpers;

src/HotChocolate/Fusion/src/CommandLine/Commands/ExportCommand.cs

@@ -0,0 +1,19 @@
+using System.CommandLine;
+
+namespace HotChocolate.Fusion.CommandLine.Commands;
+
+/// <summary>
+/// The export command
+/// </summary>
+internal sealed class ExportCommand : Command
+{
+    /// <summary>
+    /// Initializes a new instance of <see cref="ExportCommand"/>.
+    /// </summary>
+    public ExportCommand() : base("export")
+    {
+        Description = "Export commands.";
+
+        AddCommand(new ExportGraphCommand());
+    }
+}

src/HotChocolate/Fusion/src/CommandLine/Commands/ExportGraphCommand.cs

@@ -0,0 +1,65 @@
+using System.CommandLine;
+using System.Text;
+using HotChocolate.Fusion.CommandLine.Helpers;
+using HotChocolate.Utilities;
+using static System.IO.Path;
+using static HotChocolate.Fusion.CommandLine.Extensions;
+
+namespace HotChocolate.Fusion.CommandLine.Commands;
+
+internal sealed class ExportGraphCommand : Command
+{
+    public ExportGraphCommand() : base("graph")
+    {
+        var fusionPackageFile = new Option<FileInfo?>("--package-file");
+        fusionPackageFile.AddAlias("--package");
+        fusionPackageFile.AddAlias("-p");
+
+        var graphFile = new Option<FileInfo?>("--file");
+        graphFile.AddAlias("-f");
+
+        AddOption(fusionPackageFile);
+        AddOption(graphFile);
+
+        this.SetHandler(
+            ExecuteAsync,
+            Bind.FromServiceProvider<IConsole>(),
+            fusionPackageFile,
+            graphFile,
+            Bind.FromServiceProvider<CancellationToken>());
+    }
+
+    private static async Task ExecuteAsync(
+        IConsole console,
+        FileInfo? packageFile,
+        FileInfo? graphFile,
+        CancellationToken cancellationToken)
+    {
+        packageFile ??= new FileInfo(Combine(Environment.CurrentDirectory, "gateway" + FusionPackage));
+
+        if (!packageFile.Exists)
+        {
+            if (Directory.Exists(packageFile.FullName))
+            {
+                packageFile = new FileInfo(Combine(packageFile.FullName, "gateway" + FusionPackage));   
+            }
+            else if (!packageFile.Extension.EqualsOrdinal(FusionPackage) &&
+                !packageFile.Extension.EqualsOrdinal(ZipPackage))
+            {
+                packageFile = new FileInfo(packageFile.FullName + FusionPackage);   
+            }
+
+            if (!packageFile.Exists)
+            {
+                console.WriteLine($"The package file `{packageFile.FullName}` does not exist.");
+                return;
+            }
+        }
+
+        graphFile ??= new FileInfo(Combine(packageFile.DirectoryName!, "fusion.graphql"));
+
+        await using var package = FusionGraphPackage.Open(packageFile.FullName);
+        var graph = await package.GetFusionGraphAsync(cancellationToken);
+        await File.WriteAllTextAsync(graphFile.FullName, graph.ToString(true), Encoding.UTF8, cancellationToken);
+    }
+}

src/HotChocolate/Fusion/src/CommandLine/Commands/RootCommand.cs

@@ -1,4 +1,5 @@
 using System.CommandLine;
+using System.Diagnostics.CodeAnalysis;
 using static System.IO.Path;
 
 namespace HotChocolate.Fusion.CommandLine.Commands;
@@ -11,11 +12,13 @@ internal sealed class RootCommand : Command
     /// <summary>
     /// Initializes a new instance of <see cref="RootCommand"/>.
     /// </summary>
+    [RequiresUnreferencedCode("Calls HotChocolate.Fusion.CommandLine.Commands.ComposeCommand.ComposeCommand()")]
     public RootCommand() : base("fusion")
     {
         Description = "A command line tool for a Hot Chocolate Fusion.";
 
         AddCommand(new ComposeCommand());
         AddCommand(new SubgraphCommand());
+        AddCommand(new ExportCommand());
     }
 }