From 78ace538a6b1a038bebc360a4fee939b7629b786 Mon Sep 17 00:00:00 2001
From: Fabian Greffrath <fabian@greffrath.com>
Date: Tue, 10 Dec 2019 22:00:04 +0100
Subject: [PATCH] do not expect user input if stdin is redirected

If GZDoom is built on a POSIX system without the GTK frontend and not
run from a KDE session, an IWAD picker is presented on the terminal
and expects the user to select a game wad. However, if stdin is
redirected, this won't work, so start with the default IWAD instead.
---
 src/posix/sdl/i_system.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/posix/sdl/i_system.cpp b/src/posix/sdl/i_system.cpp
index 8079c7209..8258c6e9b 100644
--- a/src/posix/sdl/i_system.cpp
+++ b/src/posix/sdl/i_system.cpp
@@ -338,6 +338,11 @@ int I_PickIWad (WadStuff *wads, int numwads, bool showwin, int defaultiwad)
 	return I_PickIWad_Cocoa (wads, numwads, showwin, defaultiwad);
 #endif
 	
+	if (!isatty(fileno(stdin)))
+	{
+		return defaultiwad;
+	}
+
 	printf ("Please select a game wad (or 0 to exit):\n");
 	for (i = 0; i < numwads; ++i)
 	{