Show a warning if the instance path contains a '!'

The checks and warnings happen the time MMC loads (via QLOG_INFO), the time the GUI starts (via a dialog) and when the user changes the instance path via the settings window.

MultiMC.cpp

@@ -54,8 +54,7 @@ static const int APPDATA_BUFFER_SIZE = 1024;
 
 using namespace Util::Commandline;
 
-MultiMC::MultiMC(int &argc, char **argv, bool root_override)
-	: QApplication(argc, argv)
+MultiMC::MultiMC(int &argc, char **argv, bool root_override) : QApplication(argc, argv)
 {
 	setOrganizationName("MultiMC");
 	setApplicationName("MultiMC5");
@@ -216,6 +215,15 @@ MultiMC::MultiMC(int &argc, char **argv, bool root_override)
 
 	// and instances
 	auto InstDirSetting = m_settings->getSetting("InstanceDir");
+	// instance path: check for problems with '!' in instance path and warn the user in the log
+	// and rememer that we have to show him a dialog when the gui starts (if it does so)
+	QString instDir = MMC->settings()->get("InstanceDir").toString();
+	QLOG_INFO() << "Instance path              : " << instDir;
+	if (checkProblemticPathJava(QDir(instDir)))
+	{
+		QLOG_WARN()
+			<< "Your instance path contains \'!\' and this is known to cause java problems";
+	}
 	m_instances.reset(new InstanceList(InstDirSetting->get().toString(), this));
 	QLOG_INFO() << "Loading Instances...";
 	m_instances->loadList();
@@ -245,8 +253,7 @@ MultiMC::MultiMC(int &argc, char **argv, bool root_override)
 	{
 		profiler->registerSettings(m_settings.get());
 	}
-	m_tools.insert("mcedit",
-				   std::shared_ptr<BaseDetachedToolFactory>(new MCEditFactory()));
+	m_tools.insert("mcedit", std::shared_ptr<BaseDetachedToolFactory>(new MCEditFactory()));
 	for (auto tool : m_tools.values())
 	{
 		tool->registerSettings(m_settings.get());
@@ -374,7 +381,9 @@ void MultiMC::initGlobalSettings()
 	QString ftbDefault, newFtbDefault, oldFtbDefault;
 	if (!GetEnvironmentVariableW(L"LOCALAPPDATA", newBuf, APPDATA_BUFFER_SIZE))
 	{
-		QLOG_FATAL() << "Your LOCALAPPDATA folder is missing! If you are on windows, this means your system is broken. If you aren't on windows, how the **** are you running the windows build????";
+		QLOG_FATAL() << "Your LOCALAPPDATA folder is missing! If you are on windows, this "
+						"means your system is broken. If you aren't on windows, how the **** "
+						"are you running the windows build????";
 	}
 	else
 	{
@@ -382,7 +391,9 @@ void MultiMC::initGlobalSettings()
 	}
 	if (!GetEnvironmentVariableW(L"APPDATA", buf, APPDATA_BUFFER_SIZE))
 	{
-		QLOG_FATAL() << "Your APPDATA folder is missing! If you are on windows, this means your system is broken. If you aren't on windows, how the **** are you running the windows build????";
+		QLOG_FATAL() << "Your APPDATA folder is missing! If you are on windows, this means "
+						"your system is broken. If you aren't on windows, how the **** are you "
+						"running the windows build????";
 	}
 	else
 	{
@@ -405,10 +416,8 @@ void MultiMC::initGlobalSettings()
 #endif
 	m_settings->registerSetting("FTBLauncherDataRoot", ftbDataDefault);
 	m_settings->registerSetting("FTBLauncherRoot", ftbDefault);
-	QLOG_INFO() << "FTB Launcher paths:"
-				<< m_settings->get("FTBLauncherDataRoot").toString()
-				<< "and"
-				<< m_settings->get("FTBLauncherRoot").toString();
+	QLOG_INFO() << "FTB Launcher paths:" << m_settings->get("FTBLauncherDataRoot").toString()
+				<< "and" << m_settings->get("FTBLauncherRoot").toString();
 
 	m_settings->registerSetting("FTBRoot");
 	if (m_settings->get("FTBRoot").isNull())
@@ -544,11 +553,13 @@ void MultiMC::updateProxySettings()
 	// Set the application proxy settings.
 	if (proxyTypeStr == "SOCKS5")
 	{
-		QNetworkProxy::setApplicationProxy(QNetworkProxy(QNetworkProxy::Socks5Proxy, addr, port, user, pass));
+		QNetworkProxy::setApplicationProxy(
+			QNetworkProxy(QNetworkProxy::Socks5Proxy, addr, port, user, pass));
 	}
 	else if (proxyTypeStr == "HTTP")
 	{
-		QNetworkProxy::setApplicationProxy(QNetworkProxy(QNetworkProxy::HttpProxy, addr, port, user, pass));
+		QNetworkProxy::setApplicationProxy(
+			QNetworkProxy(QNetworkProxy::HttpProxy, addr, port, user, pass));
 	}
 	else if (proxyTypeStr == "None")
 	{
@@ -563,7 +574,8 @@ void MultiMC::updateProxySettings()
 
 	QLOG_INFO() << "Detecting proxy settings...";
 	QNetworkProxy proxy = QNetworkProxy::applicationProxy();
-	if (m_qnam.get()) m_qnam->setProxy(proxy);
+	if (m_qnam.get())
+		m_qnam->setProxy(proxy);
 	QString proxyDesc;
 	if (proxy.type() == QNetworkProxy::NoProxy)
 	{
@@ -662,7 +674,6 @@ std::shared_ptr<URNResolver> MultiMC::resolver()
 	return m_resolver;
 }
 
-
 void MultiMC::installUpdates(const QString updateFilesDir, UpdateFlags flags)
 {
 	// if we are going to update on exit, save the params now

depends/util/include/pathutils.h

@@ -16,6 +16,7 @@
 #pragma once
 
 #include <QString>
+#include <QDir>
 
 #include "libutil_config.h"
 
@@ -57,3 +58,6 @@ LIBUTIL_EXPORT void openFileInDefaultProgram(QString filename);
 
 /// Opens the given directory in the default application.
 LIBUTIL_EXPORT void openDirInDefaultProgram(QString dirpath, bool ensureExists = false);
+
+/// Checks if the a given Path contains "!"
+LIBUTIL_EXPORT bool checkProblemticPathJava(QDir folder);

depends/util/src/pathutils.cpp

@@ -144,3 +144,11 @@ void openFileInDefaultProgram(QString filename)
 {
 	QDesktopServices::openUrl(QUrl::fromLocalFile(filename));
 }
+
+// Does the directory path contain any '!'? If yes, return true, otherwise false.
+// (This is a problem for Java)
+bool checkProblemticPathJava(QDir folder)
+{
+	QString pathfoldername = folder.absolutePath();
+	return pathfoldername.contains("!", Qt::CaseInsensitive);
+}

gui/MainWindow.cpp

@@ -1533,3 +1533,21 @@ void MainWindow::checkSetDefaultJava()
 			MMC->settings()->set("JavaPath", QString("java"));
 	}
 }
+
+void MainWindow::checkInstancePathForProblems()
+{
+	QString instanceFolder = MMC->settings()->get("InstanceDir").toString();
+	if (checkProblemticPathJava(QDir(instanceFolder)))
+	{
+		QMessageBox warning;
+		warning.setText(tr(
+			"Your instance folder contains \'!\' and this is known to cause Java problems!"));
+		warning.setInformativeText(
+			tr("You have now three options: <br/>"
+			   " - ignore this warning <br/>"
+			   " - change the instance dir in the settings <br/>"
+			   " - move this installation of MultiMC5 to a different folder"));
+		warning.setDefaultButton(QMessageBox::Ok);
+		warning.exec();
+	}
+}

gui/MainWindow.h

@@ -52,6 +52,7 @@ public:
 
 	void checkSetDefaultJava();
 	void checkMigrateLegacyAssets();
+	void checkInstancePathForProblems();
 
 private
 slots:

gui/pages/global/MultiMCPage.cpp

@@ -118,10 +118,31 @@ void MultiMCPage::on_instDirBrowseBtn_clicked()
 
 	// do not allow current dir - it's dirty. Do not allow dirs that don't exist
 	if (!cooked_dir.isEmpty() && QDir(cooked_dir).exists())
+	{
+		if (checkProblemticPathJava(QDir(cooked_dir)))
+		{
+			QMessageBox warning;
+			warning.setText(tr("You're trying to specify an instance folder which\'s path "
+							   "contains at least one \'!\'. "
+							   "Java is known to cause problems if that is the case, your "
+							   "instances (probably) won't start!"));
+			warning.setInformativeText(
+				tr("Do you really want to use this path? "
+				   "Selecting \"No\" will close this and not alter your instance path."));
+			warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+			int result = warning.exec();
+			if (result == QMessageBox::Yes)
 			{
 				ui->instDirTextBox->setText(cooked_dir);
 			}
 		}
+		else
+		{
+			ui->instDirTextBox->setText(cooked_dir);
+		}
+	}
+}
+
 void MultiMCPage::on_iconsDirBrowseBtn_clicked()
 {
 	QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Icons Directory"),

main.cpp

@@ -17,6 +17,7 @@ int main_gui(MultiMC &app)
 	mainWin.show();
 	mainWin.checkMigrateLegacyAssets();
 	mainWin.checkSetDefaultJava();
+	mainWin.checkInstancePathForProblems();
 	return app.exec();
 }