From de95354d517db07200a03f97991dfd08199015c9 Mon Sep 17 00:00:00 2001
From: KamFretoZ <14798312+kamfretoz@users.noreply.github.com>
Date: Thu, 23 Jan 2025 20:25:52 +0700
Subject: [PATCH] Qt: Add Portable Mode launch argument

---
 pcsx2-qt/QtHost.cpp   |  6 ++++++
 pcsx2/Config.h        |  1 +
 pcsx2/Pcsx2Config.cpp | 12 ++++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/pcsx2-qt/QtHost.cpp b/pcsx2-qt/QtHost.cpp
index 04eb781767d71..be8c3f4c5dd53 100644
--- a/pcsx2-qt/QtHost.cpp
+++ b/pcsx2-qt/QtHost.cpp
@@ -2040,6 +2040,7 @@ void QtHost::PrintCommandLineHelp(const std::string_view progname)
 	std::fprintf(stderr, "  -version: Displays version information and exits.\n");
 	std::fprintf(stderr, "  -batch: Enables batch mode (exits after shutting down).\n");
 	std::fprintf(stderr, "  -nogui: Hides main window while running (implies batch mode).\n");
+	std::fprintf(stderr, "  -portable: Force enable portable mode to store data in local PCSX2 path instead of the current user's Documents path.\n");
 	std::fprintf(stderr, "  -elf <file>: Overrides the boot ELF with the specified filename.\n");
 	std::fprintf(stderr, "  -gameargs <string>: passes the specified quoted space-delimited string of launch arguments.\n");
 	std::fprintf(stderr, "  -disc <path>: Uses the specified host DVD drive as a source.\n");
@@ -2111,6 +2112,11 @@ bool QtHost::ParseCommandLineOptions(const QStringList& args, std::shared_ptr<VM
 				s_nogui_mode = true;
 				continue;
 			}
+			else if (CHECK_ARG(QStringLiteral("-portable")))
+			{
+				EmuConfig.IsPortableMode = true;
+				continue;
+			}
 			else if (CHECK_ARG(QStringLiteral("-fastboot")))
 			{
 				AutoBoot(autoboot)->fast_boot = true;
diff --git a/pcsx2/Config.h b/pcsx2/Config.h
index 37e4a7dffcc31..7d76df7a451c5 100644
--- a/pcsx2/Config.h
+++ b/pcsx2/Config.h
@@ -1328,6 +1328,7 @@ struct Pcsx2Config
 	std::string CurrentIRX;
 	std::string CurrentGameArgs;
 	AspectRatioType CurrentAspectRatio = AspectRatioType::RAuto4_3_3_2;
+	bool IsPortableMode = false;
 
 	Pcsx2Config();
 	void LoadSave(SettingsWrapper& wrap);
diff --git a/pcsx2/Pcsx2Config.cpp b/pcsx2/Pcsx2Config.cpp
index ae9fcb2605df2..5806c11682f67 100644
--- a/pcsx2/Pcsx2Config.cpp
+++ b/pcsx2/Pcsx2Config.cpp
@@ -2036,6 +2036,7 @@ void Pcsx2Config::CopyRuntimeConfig(Pcsx2Config& cfg)
 	CurrentIRX = std::move(cfg.CurrentIRX);
 	CurrentGameArgs = std::move(cfg.CurrentGameArgs);
 	CurrentAspectRatio = cfg.CurrentAspectRatio;
+	IsPortableMode = cfg.IsPortableMode;
 
 	for (u32 i = 0; i < sizeof(Mcd) / sizeof(Mcd[0]); i++)
 	{
@@ -2122,8 +2123,15 @@ bool EmuFolders::SetResourcesDirectory()
 
 bool EmuFolders::ShouldUsePortableMode()
 {
-	// Check whether portable.ini exists in the program directory.
-	return FileSystem::FileExists(Path::Combine(AppRoot, "portable.ini").c_str()) || FileSystem::FileExists(Path::Combine(AppRoot, "portable.txt").c_str());
+	// Check whether portable.ini/txt exists in the program directory or the `-portable` launch arguments have been passed.
+	if (FileSystem::FileExists(Path::Combine(AppRoot, "portable.ini").c_str()) ||
+		FileSystem::FileExists(Path::Combine(AppRoot, "portable.txt").c_str()) ||
+		EmuConfig.IsPortableMode)
+	{
+		return true;
+	}
+
+	return false;
 }
 
 std::string EmuFolders::GetPortableModePath()