Add the command line parser and parse the tool arguments

VSConfigFinder/.editorconfig

@@ -15,7 +15,7 @@ dotnet_style_object_initializer = true:suggestion
 dotnet_style_collection_initializer = true:suggestion
 dotnet_style_prefer_simplified_boolean_expressions = true:suggestion
 dotnet_style_prefer_conditional_expression_over_assignment = true:silent
-csharp_using_directive_placement = outside_namespace:silent
+csharp_using_directive_placement = inside_namespace:silent
 csharp_prefer_simple_using_statement = true:suggestion
 csharp_prefer_braces = true:silent
 csharp_style_namespace_declarations = block_scoped:silent

VSConfigFinder/CommandLineOptions.cs

@@ -1,18 +1,19 @@
 namespace VSConfigFinder
 {
-    internal class CommandLineOptions : ICommandLineOptions
-    {
-        public CommandLineOptions(string filePath, string output)
-        {
-            Utilities.ValidateIsNotNullOrEmpty(filePath, nameof(filePath));
-            Utilities.ValidateOutputParameter(output, nameof(output));
-
-            FilePath = filePath;
-            Output = output;
-        }
+    using CommandLine;
 
-        public string FilePath { get; set; }
+    /// <inheritdoc/>
+    public class CommandLineOptions : ICommandLineOptions
+    {
+        /// <inheritdoc/>
+        [Option("folderpath", Required = true, HelpText = "Set the source folder path to use as the root. The search will start from the root towards the bottom.")]
+        public string FolderPath { get; set; }
 
-        public string Output { get; set; }
+        /// <inheritdoc/>
+        [Option("createfile", Required = false, HelpText = "Set the folder path to output the consolidated .vsconfig.\n" +
+            "If the argument (--createfile) is not passed at all, the program will output the cli arguments that can be fed into the Visual Studio Installer setup arguments. (e.g. --add Microsoft.VisualStudio.Component.Roslyn.Compiler Microsoft.Net.Component.4.8.SDK)\n" +
+            "If the argument is passed without a following folder path, the program will create and output the final .vsconfig into the current directory.\n" +
+            "If the argument is passed with a following folder path, the program will create and output the final .vsconfig into the specified folder path that is followed by --createFile.")]
+        public string? CreateFile { get; set; }
     }
 }

VSConfigFinder/ICommandLineOptions.cs

@@ -1,9 +1,19 @@
 namespace VSConfigFinder
 {
-    internal interface ICommandLineOptions
+    /// <summary>
+    /// The interface for the command line options.
+    /// </summary>
+    public interface ICommandLineOptions
     {
-        string FilePath { get; set; }
+        /// <summary>
+        /// Gets or sets the folder path to be used as the root (starting point) of the search.
+        /// </summary>
+        string FolderPath { get; set; }
 
-        string Output { get; set; }
+        /// <summary>
+        /// Gets or sets the folder path to output the consolidated .vsconfig instead of the command line arguments.
+        /// If a folder path is not provided after the argument, the output folder will default to the current directory.
+        /// </summary>
+        string? CreateFile { get; set; }
     }
 }

VSConfigFinder/Program.cs

@@ -1,11 +1,38 @@
-internal class Program
+namespace VSConfigFinder
 {
-    private static void Main(string[] args)
+    using CommandLine;
+
+    /// <summary>
+    /// <see cref="Program"/> class for the .vsconfig finder tool.
+    /// </summary>
+    public class Program
     {
-        // Take in the command line arguments
+        /// <summary>
+        /// Main entry point of the tool.
+        /// </summary>
+        /// <param name="args">The program arguments</param>
+        public static void Main(string[] args)
+        {
+            var parser = new Parser(with =>
+            {
+                with.CaseSensitive = false;
+            });
+
+            // Take in the command line arguments
+            parser.ParseArguments<CommandLineOptions>(args)
+                .WithParsed(Run)
+                .WithNotParsed(HandleParseError);
+        }
 
-        // Create a runner
+        private static void Run(CommandLineOptions options)
+        {
+            Console.WriteLine("Hello! I succeeded!");
+            Console.WriteLine($"--createFile: {options.CreateFile}");
+        }
 
-        // Run and output
+        private static void HandleParseError(IEnumerable<Error> errors)
+        {
+            Console.WriteLine("Oops, failed");
+        }
     }
 }

VSConfigFinder/VSConfigFinder.csproj

@@ -15,4 +15,8 @@
     <None Include="C:\Users\sknam\source\repos\VSConfigFinder\VSConfigFinder\.editorconfig" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="CommandLineParser" Version="2.9.1" />
+  </ItemGroup>
+
 </Project>