addons can disable other addons

game/engines/default/engine/Module.lua

@@ -490,6 +490,8 @@ function _M:loadAddons(mod, saveuse)
 
 	if saveuse then saveuse = table.reverse(saveuse) end
 
+	local force_remove_addons = {}
+
 	-- Filter based on settings
 	for i = #adds, 1, -1 do
 		local add = adds[i]
@@ -523,32 +525,47 @@ function _M:loadAddons(mod, saveuse)
 			end
 		end
 
-		if add.dlc and add.dlc_files then
-			if not removed and add.dlc_files.classes then
-				for _, name in ipairs(add.dlc_files.classes) do
-					print("Preloading DLC class", name)
-					local data = profile:getDLCD(add.for_module.."-"..add.short_name, ("%d.%d.%d"):format(add.version[1],add.version[2],add.version[3]), name:gsub("%.", "/")..".lua")
-					if data and data ~= '' then
-						profile.dlc_files.classes[name] = data
-					elseif not __module_extra_info.ignore_addons_not_loading then
-						print("Removing addon "..add.short_name..": DLC class not received")
-						table.remove(adds, i) removed = true
-						if saveuse then
-							-- The savefile requires it, but we couldnt activate it, abord
-							core.game.setRebootMessage(([[The savefile requires the #YELLOW#%s#WHITE# addon.
+		if not removed then
+			if add.dlc and add.dlc_files then
+				if add.dlc_files.classes then
+					for _, name in ipairs(add.dlc_files.classes) do
+						print("Preloading DLC class", name)
+						local data = profile:getDLCD(add.for_module.."-"..add.short_name, ("%d.%d.%d"):format(add.version[1],add.version[2],add.version[3]), name:gsub("%.", "/")..".lua")
+						if data and data ~= '' then
+							profile.dlc_files.classes[name] = data
+						elseif not __module_extra_info.ignore_addons_not_loading then
+							print("Removing addon "..add.short_name..": DLC class not received")
+							table.remove(adds, i) removed = true
+							if saveuse then
+								-- The savefile requires it, but we couldnt activate it, abord
+								core.game.setRebootMessage(([[The savefile requires the #YELLOW#%s#WHITE# addon.
 Some of its features require being online and could not be enabled. To prevent damaging the savefile loading was aborted.
 
 You may try to force loading if you are sure the savefile does not use that addon, at your own risk, by checking the "Ignore unloadable addons" checkbox on the load game screen..]]):format(add.long_name))
-							util.showMainMenu(nil, nil, nil, nil, nil, nil, "show_ignore_addons_not_loading=true")
+								util.showMainMenu(nil, nil, nil, nil, nil, nil, "show_ignore_addons_not_loading=true")
+							end
+							break
+						else
+							add.dlc = "no"
+							print("Removing addon "..add.short_name..": dlc file required not found")
+							table.remove(adds, i) removed = true
 						end
-						break
-					else
-						add.dlc = "no"
-						print("Removing addon "..add.short_name..": dlc file required not found")
-						table.remove(adds, i) removed = true
 					end
 				end
 			end
+
+			if add.disable_addons then
+				table.merge(force_remove_addons, table.reverse(add.disable_addons))
+			end
+		end
+	end
+
+	-- Let addons disable addons!
+	for i = #adds, 1, -1 do
+		local add = adds[i]
+		if force_remove_addons[add.short_name] then
+			print("Removing addon "..add.short_name..": disabled by an other addon")
+			table.remove(adds, i)
 		end
 	end