Initial implementation of itchio upload.

Editor/Upload/UploadItch.cs

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+using UnityEngine;
+using UnityEditor;
+using System.IO;
+
+namespace UnityBuild
+{
+
+public class UploadItch : PostBuildAction
+{
+    private const string WINDOWS = "windows";
+    private const string OSX = "osx";
+    private const string LINUX = "linux";
+
+    #region MenuItems
+
+    [MenuItem("Build/Upload/itch.io/Execute", false, 50)]
+    private static void UploadAll()
+    {
+        for (int i = 0; i < BuildProject.platforms.Count; i++)
+        {
+            BuildPlatform platform = BuildProject.platforms[i];
+            PerformUpload(platform);
+        }
+    }
+
+    [MenuItem("Build/Upload/itch.io/Auto Upload")]
+    private static void ToggleAutoUpload()
+    {
+        EditorPrefs.SetBool("buildUploadItchAuto", !EditorPrefs.GetBool("buildUploadItchAuto", false));
+    }
+
+    [MenuItem("Build/Upload/itch.io/Auto Upload", true)]
+    private static bool ToggleAutoUploadValidate()
+    {
+        Menu.SetChecked("Build/Upload/itch.io/Auto Upload", EditorPrefs.GetBool("buildUploadItchAuto", false));
+        return true;
+    }
+
+    #endregion
+
+    #region Public Methods
+
+    public override void Execute(BuildPlatform platform)
+    {
+        if (EditorPrefs.GetBool("buildUploadItchAuto", false))
+            PerformUpload(platform);
+    }
+
+    #endregion
+
+    #region Private Methods
+
+    private static void PerformUpload(BuildPlatform platform)
+    {
+        if (!platform.buildEnabled)
+            return;
+
+        string absolutePath = Path.GetFullPath(platform.buildPath).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+
+        if (File.Exists(absolutePath))
+        {
+            Debug.Log("UploadItch: Upload Failed - Build does not exist for platform " + platform.name + " - " + absolutePath);
+            return;
+        }
+
+        string channel = GetChannelName(platform.target);
+        if (string.IsNullOrEmpty(channel))
+        {
+            Debug.Log("UploadItch: Upload Failed - Unknown platform " + platform.name);
+            return;
+        }
+
+        string arguments = "push \"" + absolutePath + "\" " + UploadItchSettings.itchUserName + "/" + UploadItchSettings.itchGameName + ":" + channel;
+
+        if (!string.IsNullOrEmpty(UploadItchSettings.versionNumber))
+        {
+            arguments += "--userversion " + UploadItchSettings.versionNumber;
+        }
+
+        System.Diagnostics.Process uploadProc = new System.Diagnostics.Process();
+        uploadProc.StartInfo.FileName = UploadItchSettings.butlerPath;
+        uploadProc.StartInfo.Arguments =
+            arguments;
+        uploadProc.StartInfo.CreateNoWindow = false;
+        uploadProc.StartInfo.UseShellExecute = false;
+        uploadProc.Start();
+    }
+
+    private static string GetChannelName(BuildTarget target)
+    {
+        switch (target)
+        {
+            // Windows
+            case BuildTarget.StandaloneWindows:
+                return WINDOWS + "-x86";
+            case BuildTarget.StandaloneWindows64:
+                return WINDOWS + "-x64";
+
+            // Linux
+            case BuildTarget.StandaloneLinux:
+                return LINUX + "-x86";
+            case BuildTarget.StandaloneLinux64:
+                return LINUX + "-x64";
+            case BuildTarget.StandaloneLinuxUniversal:
+                return LINUX + "-universal";
+
+            // OSX
+            case BuildTarget.StandaloneOSXIntel:
+                return OSX + "-intel";
+            case BuildTarget.StandaloneOSXIntel64:
+                return OSX + "-intel64";
+            case BuildTarget.StandaloneOSXUniversal:
+                return OSX + "-universal";
+
+            default:
+                return null;
+        }
+    }
+
+    #endregion
+
+    #region Public Properties
+
+    public override int priority
+    {
+        get
+        {
+            return 1000;
+        }
+    }
+
+    #endregion
+}
+
+}

Editor/Upload/UploadItchSettings.cs

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+using UnityEngine;
+using UnityEditor;
+
+public class UploadItchSettings
+{
+    #region Constants
+
+    private const string _butlerPath = @"D:\User\Chase\Downloads\game-dev\butler\butler.exe";
+    private const string _itchUserName = "supersystems";
+    private const string _itchGameName = "butler-test";
+
+    #endregion
+
+    #region Public Properties
+
+    public static string versionNumber
+    {
+        get
+        {
+            return string.Empty;
+        }
+    }
+
+    public static string butlerPath
+    {
+        get
+        {
+            return _butlerPath;
+        }
+    }
+
+    public static string itchUserName
+    {
+        get
+        {
+            return _itchUserName;
+        }
+    }
+
+    public static string itchGameName
+    {
+        get
+        {
+            return _itchGameName;
+        }
+    }
+
+    #endregion
+}