cli: Added simplify command.

src/libs/OpenApiGenerator.Cli/Commands/SimplifyCommand.cs

@@ -0,0 +1,55 @@
+using System.CommandLine;
+using Microsoft.OpenApi;
+using Microsoft.OpenApi.Extensions;
+using OpenApiGenerator.Core.Extensions;
+
+namespace OpenApiGenerator.Cli.Commands;
+
+public class SimplifyCommand : Command
+{
+    public SimplifyCommand() : base(name: "simplify", description: "Simplifies OpenAPI spec.")
+    {
+        var inputOption = new Argument<string>(
+            name: "input",
+            getDefaultValue: () => string.Empty,
+            description: "Input file path");
+        var outputOption = new Option<string>(
+            aliases: ["--output", "-o"],
+            getDefaultValue: () => "simplified.yaml",
+            description: "Output file path");
+        AddArgument(inputOption);
+        AddOption(outputOption);
+
+        this.SetHandler(
+            HandleAsync,
+            inputOption,
+            outputOption);
+    }
+
+    private static async Task HandleAsync(
+        string inputPath,
+        string outputPath)
+    {
+        Console.WriteLine($"Loading {inputPath}...");
+
+        using var client = new HttpClient();
+        var yamlOrJson = inputPath.StartsWith("http", StringComparison.OrdinalIgnoreCase)
+            ? await client.GetStringAsync(new Uri(inputPath)).ConfigureAwait(false)
+            : await File.ReadAllTextAsync(inputPath).ConfigureAwait(false);
+        var openApiDocument = yamlOrJson.GetOpenApiDocument();
+
+        Console.WriteLine("Simplifying...");
+
+        openApiDocument = openApiDocument.Simplify();
+
+        var text = Path.GetExtension(outputPath).ToUpperInvariant() switch
+        {
+            ".JSON" => openApiDocument.SerializeAsJson(OpenApiSpecVersion.OpenApi3_0),
+            _ => openApiDocument.SerializeAsYaml(OpenApiSpecVersion.OpenApi3_0),
+        };
+
+        await File.WriteAllTextAsync(outputPath, text).ConfigureAwait(false);
+
+        Console.WriteLine("Done.");
+    }
+}

src/libs/OpenApiGenerator.Cli/Program.cs

@@ -4,5 +4,6 @@
 var rootCommand = new RootCommand(
     description: "CLI tool to use OpenApiGenerator");
 rootCommand.AddCommand(new GenerateCommand());
+rootCommand.AddCommand(new SimplifyCommand());
 
 return await rootCommand.InvokeAsync(args).ConfigureAwait(false);

src/tests/OpenApiGenerator.IntegrationTests.Cli/CliTests.cs

@@ -20,7 +20,7 @@ public class CliTests
     [DataRow("twitch.json")]
     [DataRow("https://dedoose-rest-api.onrender.com/swagger/v1/swagger.json")]
     [DataRow("together.yaml")]
-    public async Task Run(string spec)
+    public async Task Generate(string spec)
     {
         var tempDirectory = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
         try