Initial

Terminal/Commands/GenerateCommands.cs

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+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+using Cocona;
+using NJsonSchema.CodeGeneration.CSharp;
+using NSwag;
+using NSwag.CodeGeneration.CSharp;
+using Terminal.Validation;
+
+namespace Terminal.Commands;
+
+[SuppressMessage("ReSharper", "ClassNeverInstantiated.Global")]
+public class GenerateCommands
+{
+    [Command(Aliases = ["generate"], Description = "Generate a client from an OpenAPI document")]
+    public async Task Gen(
+        [Option(shortName: 'a', Description = "The address of the OpenAPI document, e.g. 'https://petstore.swagger.io/v2/swagger.json'")]
+        Uri address,
+        
+        [Option(shortName: 'd', Description = "The destination file, e.g. 'PetStoreClient.cs'. You can use a relative or absolute path and use any environment variables.")]
+        [ValidPath]
+        string destinationFile,
+        
+        [Option(shortName: 'n', Description = "The namespace of the generated client, e.g. 'MyApp.API.PetStoreClient'")]
+        string nameSpace = "API_Client",
+        
+        [Option(shortName: 'c', Description = "The class name of the generated client, e.g. 'PetStoreClient'. You might want to use '{controller}' as a placeholder for the controller name.")]
+        string className = "{controller}Client",
+        
+        [Option(shortName: 'b', Description = "Expose the base URL as a property in the generated client? (Default: false)")]
+        bool exposeBaseUrl = false,
+        
+        [Option(shortName: 'i', Description = "The base interface of the generated client(s), e.g. 'IPetStoreClient'")]
+        string? baseInterface = null)
+    {
+        using var httpClient = new HttpClient();
+        var result = await httpClient.GetAsync(address);
+        var openAPI = await OpenApiDocument.FromJsonAsync(await result.Content.ReadAsStringAsync());
+        var generator = new CSharpClientGenerator(openAPI, new CSharpClientGeneratorSettings
+        {
+            UseBaseUrl = exposeBaseUrl,
+            ClientBaseInterface = baseInterface,
+            GenerateClientInterfaces = baseInterface is not null,
+            ClassName = className,
+            CSharpGeneratorSettings =
+            {
+                Namespace = nameSpace,
+                JsonLibrary = CSharpJsonLibrary.SystemTextJson,
+            }
+        });
+        
+        var apiClientCode = generator.GenerateFile();
+        
+        destinationFile = Environment.ExpandEnvironmentVariables(destinationFile);
+        await File.WriteAllTextAsync(destinationFile, apiClientCode, Encoding.UTF8);
+        Console.WriteLine($"Generated client(s) for '{address}' and saved it to '{destinationFile}'");
+    }
+}

Terminal/Commands/VersionCommands.cs

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+using System.Diagnostics.CodeAnalysis;
+using Cocona;
+
+namespace Terminal.Commands;
+
+[SuppressMessage("ReSharper", "ClassNeverInstantiated.Global")]
+public class VersionCommands
+{
+    [Command(Aliases = ["ver"], Description = "Show the version of the OpenAPI Client Builder")]
+    public void Version() => ShowVersion();
+
+    public static void ShowVersion()
+    {
+        Console.WriteLine($"OpenAPI Client Builder v1.0.0, built using .NET {Environment.Version}.");
+    }
+}