From e301c7fe01bf125a75f4fa6986557a8602b313ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tam=C3=A1s=20B=C3=A1lint=20Misius?= <lbphacker@gmail.com>
Date: Sat, 3 May 2025 11:55:38 +0200
Subject: [PATCH] Add 'console' command line argument

This opens a console window on Windows but does nothing anywhere else. Overrides 'redirect'.

Useful on Windows because the only way to access standard streams there is by tail -f'ing stdout/err.txt.
---
 README.md                       |  1 +
 src/PowderToy.cpp               |  6 +++++-
 src/common/platform/Platform.h  |  1 +
 src/common/platform/Posix.cpp   |  4 ++++
 src/common/platform/Windows.cpp | 11 +++++++++++
 5 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 88ddac86e..38515a61a 100644
--- a/README.md
+++ b/README.md
@@ -124,5 +124,6 @@ Command Line
 | `disable-network`     | Disables internet connections                    |                                             |
 | `disable-bluescreen`  | Disable bluescreen handler                       |                                             |
 | `redirect`            | Redirects output to stdout.txt / stderr.txt      |                                             |
+| `console`             | Redirects output to a new console on Windows     |                                             |
 | `cafile:CAFILE`       | Set certificate bundle path                      | `cafile:/etc/ssl/certs/ca-certificates.crt` |
 | `capath:CAPATH`       | Set certificate directory path                   | `capath:/etc/ssl/certs`                     |
diff --git a/src/PowderToy.cpp b/src/PowderToy.cpp
index 593f1442d..10437fbdf 100644
--- a/src/PowderToy.cpp
+++ b/src/PowderToy.cpp
@@ -380,7 +380,11 @@ int Main(int argc, char *argv[])
 	}
 
 	auto redirectStd = prefs.Get("RedirectStd", false);
-	if (true_arg(arguments["redirect"]) || redirectStd)
+	if (true_arg(arguments["console"]))
+	{
+		Platform::AllocConsole();
+	}
+	else if (true_arg(arguments["redirect"]) || redirectStd)
 	{
 		FILE *new_stdout = freopen("stdout.log", "w", stdout);
 		FILE *new_stderr = freopen("stderr.log", "w", stderr);
diff --git a/src/common/platform/Platform.h b/src/common/platform/Platform.h
index b3f2a92d3..76d9b184d 100644
--- a/src/common/platform/Platform.h
+++ b/src/common/platform/Platform.h
@@ -74,6 +74,7 @@ namespace Platform
 	std::optional<std::vector<String>> StackTrace();
 
 	void MarkPresentable();
+	void AllocConsole();
 }
 
 extern "C" int Main(int argc, char *argv[]);
diff --git a/src/common/platform/Posix.cpp b/src/common/platform/Posix.cpp
index 975221bb3..710b3bd6c 100644
--- a/src/common/platform/Posix.cpp
+++ b/src/common/platform/Posix.cpp
@@ -150,4 +150,8 @@ std::vector<ByteString> DirectoryList(ByteString directory)
 	closedir(directoryHandle);
 	return directoryList;
 }
+
+void AllocConsole()
+{
+}
 }
diff --git a/src/common/platform/Windows.cpp b/src/common/platform/Windows.cpp
index e1c257add..fe16de05d 100644
--- a/src/common/platform/Windows.cpp
+++ b/src/common/platform/Windows.cpp
@@ -10,6 +10,7 @@
 #include <windows.h>
 #include <crtdbg.h>
 #include <memory>
+#include <cstdlib>
 
 namespace Platform
 {
@@ -409,4 +410,14 @@ void SetupCrt()
 		std::cerr << "failed to set codepage to utf-8, expect breakage" << std::endl;
 	}
 }
+
+void AllocConsole()
+{
+	if (!::AllocConsole())
+	{
+		return;
+	}
+	freopen("CONOUT$", "w", stdout);
+	freopen("CONOUT$", "w", stderr);
+}
 }