Attach console to an explicitly defined PID

IPA.Injector/Injector.cs

@@ -43,8 +43,23 @@ namespace IPA.Injector
 
             try
             {
-                if (Environment.GetCommandLineArgs().Contains("--verbose"))
-                    WinConsole.Initialize();
+                var cmd = Environment.GetCommandLineArgs();
+
+                if (cmd.Contains("--verbose"))
+                {
+                    var arg = string.Empty;
+
+                    for (var i = 0; i < cmd.Length; i++)
+                    {
+                        if (cmd[i] == "-pid")
+                        {
+                            arg = cmd[i + 1];
+                            break;
+                        }
+                    }
+
+                    WinConsole.Initialize(uint.TryParse(arg, out uint pid) ? pid : WinConsole.AttachParent);
+                }
 
                 SetupLibraryLoading();
 

IPA.Loader/Logging/ConsoleWindow.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.ComponentModel;
 using System.IO;
 using System.Runtime.InteropServices;
@@ -22,11 +22,11 @@ namespace IPA.Logging
 
         internal static bool IsInitialized;
 
-        public static void Initialize(bool alwaysCreateNewConsole = false)
+        public static void Initialize(uint pid, bool alwaysCreateNewConsole = false)
         {
             bool consoleAttached = true;
             if (alwaysCreateNewConsole
-                || (AttachConsole(AttachParent) == 0
+                || (AttachConsole(pid) == 0
                 && Marshal.GetLastWin32Error() != ErrorAccessDenied))
             {
                 consoleAttached = AllocConsole() != 0;
@@ -155,7 +155,7 @@ namespace IPA.Logging
         private const uint FileAttributeNormal = 0x80;
         private const uint ErrorAccessDenied = 5;
         
-        private const uint AttachParent = 0xFFFFFFFF;
+        public const uint AttachParent = 0xFFFFFFFF;
 
 #endregion
     }

docs/articles/command-line.md

@@ -26,6 +26,16 @@ Here's a quick list of what they are and what they do.
 
   > Makes a console appear with log information at startup.
   >
+  > Optionally, to start Beat Saber with an external console, an explicit `-pid` can be specified. This allows the game to be launched without being interrupted by Steam's "Allow game launch?" popup when directly launching `Beat Saber.exe` with arguments.
+  > - Using PowerShell: 
+  >   ```powershell
+  >   .\steam -applaunch 620980 --verbose -pid $PID
+  >   ```
+  > - Using Command Prompt:
+  >   ```powershell
+  >   powershell -c ".\steam -applaunch 620980 --verbose -pid (Get-CimInstance Win32_Process -Filter ProcessId=$PID).ParentProcessId"
+  >   ```
+  >
 
 - `--debug`