1 files changed, 97 insertions, 0 deletions

diff --git a/src/heat/HelpCommand.cs b/src/heat/HelpCommand.cs
new file mode 100644
index 00000000..bd2bcc24
--- /dev/null
+++ b/src/heat/HelpCommand.cs
@@ -0,0 +1,97 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Harvesters
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Diagnostics;
+    using System.Threading;
+    using System.Threading.Tasks;
+    using WixToolset.Extensibility.Data;
+    using WixToolset.Extensibility.Services;
+    using WixToolset.Harvesters.Data;
+    using WixToolset.Harvesters.Extensibility;
+
+    internal class HelpCommand : ICommandLineCommand
+    {
+        const string HelpMessageOptionFormat = "   {0,-7}  {1}";
+
+        public HelpCommand(IList<IHeatExtension> extensions)
+        {
+            this.Extensions = extensions;
+        }
+
+        private IList<IHeatExtension> Extensions { get; }
+
+        public bool ShowLogo => false;
+
+        public bool StopParsing => true;
+
+        public Task<int> ExecuteAsync(CancellationToken cancellationToken)
+        {
+            var exitCode = this.DisplayHelp();
+            return Task.FromResult(exitCode);
+        }
+
+        public static void DisplayToolHeader()
+        {
+            var wixcopAssembly = typeof(HelpCommand).Assembly;
+            var fv = FileVersionInfo.GetVersionInfo(wixcopAssembly.Location);
+
+            Console.WriteLine("WiX Toolset Harvester version {0}", fv.FileVersion);
+            Console.WriteLine("Copyright (C) .NET Foundation and contributors. All rights reserved.");
+            Console.WriteLine();
+        }
+
+        public bool TryParseArgument(ICommandLineParser parser, string argument) => true;
+
+        private int DisplayHelp()
+        {
+            DisplayToolHeader();
+
+            // output the harvest types alphabetically
+            SortedList harvestOptions = new SortedList();
+            foreach (var heatExtension in this.Extensions)
+            {
+                foreach (HeatCommandLineOption commandLineOption in heatExtension.CommandLineTypes)
+                {
+                    harvestOptions.Add(commandLineOption.Option, commandLineOption);
+                }
+            }
+
+            harvestOptions.Add("-nologo", new HeatCommandLineOption("-nologo", "skip printing heat logo information"));
+            harvestOptions.Add("-indent <N>", new HeatCommandLineOption("-indent <N>", "indentation multiple (overrides default of 4)"));
+            harvestOptions.Add("-o[ut]", new HeatCommandLineOption("-out", "specify output file (default: write to current directory)"));
+            harvestOptions.Add("-sw<N>", new HeatCommandLineOption("-sw<N>", "suppress all warnings or a specific message ID\r\n            (example: -sw1011 -sw1012)"));
+            harvestOptions.Add("-swall", new HeatCommandLineOption("-swall", "suppress all warnings (deprecated)"));
+            harvestOptions.Add("-v", new HeatCommandLineOption("-v", "verbose output"));
+            harvestOptions.Add("-wx[N]", new HeatCommandLineOption("-wx[N]", "treat all warnings or a specific message ID as an error\r\n            (example: -wx1011 -wx1012)"));
+            harvestOptions.Add("-wxall", new HeatCommandLineOption("-wxall", "treat all warnings as errors (deprecated)"));
+
+            foreach (HeatCommandLineOption commandLineOption in harvestOptions.Values)
+            {
+                if (!commandLineOption.Option.StartsWith("-"))
+                {
+                    Console.WriteLine(HelpMessageOptionFormat, commandLineOption.Option, commandLineOption.Description);
+                }
+            }
+
+            Console.WriteLine();
+            Console.WriteLine("Options:");
+
+            foreach (HeatCommandLineOption commandLineOption in harvestOptions.Values)
+            {
+                if (commandLineOption.Option.StartsWith("-"))
+                {
+                    Console.WriteLine(HelpMessageOptionFormat, commandLineOption.Option, commandLineOption.Description);
+                }
+            }
+
+            Console.WriteLine(HelpMessageOptionFormat, "-? | -help", "this help information");
+            Console.WriteLine("For more information see: https://wixtoolset.org/");
+
+            return 0;
+        }
+    }
+}