add eft launcher closed precheck

SPTInstaller/Installer Tasks/PreChecks/EftLauncherPreCheck.cs

@@ -0,0 +1,43 @@
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Serilog;
+using SPTInstaller.Models;
+
+namespace SPTInstaller.Installer_Tasks.PreChecks;
+
+public class EftLauncherPreCheck : PreCheckBase
+{
+    public EftLauncherPreCheck() : base("EFT Launcher Closed", true)
+    {
+    }
+
+    public async override Task<PreCheckResult> CheckOperation()
+    {
+        var eftLauncherProcs = Process.GetProcessesByName("BsgLauncher");
+        
+        return eftLauncherProcs.Length == 0
+            ? PreCheckResult.FromSuccess("Eft launcher is closed")
+            : PreCheckResult.FromError("Eft launcher is open. Please close it to install SPT", 
+                "Kill EFT Launcher Processes", 
+                () =>
+            {
+                var bsgLauncherProcs = Process.GetProcessesByName("BsgLauncher");
+
+                foreach (var proc in bsgLauncherProcs)
+                {
+                    try
+                    {
+                        proc.Kill();
+                        proc.WaitForExit();
+                        Log.Information($"Killed Proc: {proc.ProcessName}#{proc.Id}");
+                    }
+                    catch (Exception ex)
+                    {
+                        Log.Error(ex, $"Failed to kill proc: {proc.ProcessName}#{proc.Id}");
+                    }
+                }
+                
+                RequestReevaluation();
+            });
+    }
+}

SPTInstaller/Program.cs

@@ -34,8 +34,8 @@ internal class Program
 #if !TEST
         ServiceHelper.Register<PreCheckBase, NetFramework472PreCheck>();
         ServiceHelper.Register<PreCheckBase, NetCore6PreCheck>();
-
         ServiceHelper.Register<PreCheckBase, FreeSpacePreCheck>();
+        ServiceHelper.Register<PreCheckBase, EftLauncherPreCheck>();
 
         ServiceHelper.Register<InstallerTaskBase, InitializationTask>();
         ServiceHelper.Register<InstallerTaskBase, ReleaseCheckTask>();