warn before loading incompatible replays

OpenRA.Mods.Common/Widgets/Logic/ReplayBrowserLogic.cs

@@ -32,11 +32,15 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 		Dictionary<CPos, SpawnOccupant> selectedSpawns;
 		ReplayMetadata selectedReplay;
 
+		Action onStart;
+
 		[ObjectCreator.UseCtor]
 		public ReplayBrowserLogic(Widget widget, Action onExit, Action onStart)
 		{
 			panel = widget;
 
+			this.onStart = onStart;
+
 			playerList = panel.Get<ScrollPanelWidget>("PLAYER_LIST");
 			playerHeader = playerList.Get<ScrollItemWidget>("HEADER");
 			playerTemplate = playerList.Get<ScrollItemWidget>("TEMPLATE");
@@ -73,7 +77,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 			var watch = panel.Get<ButtonWidget>("WATCH_BUTTON");
 			watch.IsDisabled = () => selectedReplay == null || selectedReplay.GameInfo.MapPreview.Status != MapStatus.Available;
-			watch.OnClick = () => { WatchReplay(); onStart(); };
+			watch.OnClick = () => { WatchReplay(); };
 
 			panel.Get("REPLAY_INFO").IsVisible = () => selectedReplay != null;
 
@@ -624,11 +628,15 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 		void WatchReplay()
 		{
-			if (selectedReplay != null && selectedReplay.GameInfo.MapPreview.Status == MapStatus.Available)
+			Action startReplay = () =>
 			{
 				Game.JoinReplay(selectedReplay.FilePath);
 				Ui.CloseWindow();
-			}
+				onStart();
+			};
+
+			if (selectedReplay != null && ReplayUtils.CheckReplayCompatibility(selectedReplay))
+				startReplay();
 		}
 
 		void AddReplay(ReplayMetadata replay, ScrollItemWidget template)

OpenRA.Mods.Common/Widgets/Logic/ReplayUtils.cs

@@ -0,0 +1,55 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	public static class ReplayUtils
+	{
+		static readonly Action DoNothing = () => { };
+
+		public static bool CheckReplayCompatibility(ReplayMetadata replayMeta, Action onCancel = null)
+		{
+			if (onCancel == null)
+				onCancel = DoNothing;
+
+			var mod = replayMeta.GameInfo.Mod;
+			if (mod == null)
+				return IncompatibleReplayDialog("an unknown mod", mod, onCancel);
+
+			var version = replayMeta.GameInfo.Version;
+			if (version == null)
+				return IncompatibleReplayDialog("an unknown version", version, onCancel);
+
+			var allMods = ModMetadata.AllMods;
+			if (!allMods.ContainsKey(mod))
+				return IncompatibleReplayDialog("an unavailable mod", mod, onCancel);
+			else if (allMods[mod].Version != version)
+				return IncompatibleReplayDialog("an incompatible version", version, onCancel);
+
+			if (replayMeta.GameInfo.MapPreview.Status != MapStatus.Available)
+				return IncompatibleReplayDialog("an unavailable map", replayMeta.GameInfo.MapUid,  onCancel);
+			else
+				return true;
+		}
+
+		static bool IncompatibleReplayDialog(string type, string name, Action onCancel)
+		{
+			var error = "It was recorded with " + type;
+			error += string.IsNullOrEmpty(name) ? "." : ":\n{0}".F(name);
+
+			ConfirmationDialogs.CancelPrompt("Incompatible Replay", error, onCancel);
+
+			return false;
+		}
+	}
+}