GH-991 implement wrapper commands

application/MultiMC.cpp

@@ -472,6 +472,9 @@ void MultiMC::initGlobalSettings(bool test_mode)
 	m_settings->registerSetting("JavaDetectionHack", "");
 	m_settings->registerSetting("JvmArgs", "");
 
+	// Wrapper command for launch
+	m_settings->registerSetting("WrapperCommand", "");
+
 	// Custom Commands
 	m_settings->registerSetting({"PreLaunchCommand", "PreLaunchCmd"}, "");
 	m_settings->registerSetting({"PostExitCommand", "PostExitCmd"}, "");

application/pages/global/JavaPage.cpp

@@ -70,6 +70,7 @@ void JavaPage::applySettings()
 
 	// Custom Commands
 	s->set("PreLaunchCommand", ui->preLaunchCmdTextBox->text());
+	s->set("WrapperCommand", ui->wrapperCmdTextBox->text());
 	s->set("PostExitCommand", ui->postExitCmdTextBox->text());
 }
 void JavaPage::loadSettings()
@@ -86,6 +87,7 @@ void JavaPage::loadSettings()
 
 	// Custom Commands
 	ui->preLaunchCmdTextBox->setText(s->get("PreLaunchCommand").toString());
+	ui->wrapperCmdTextBox->setText(s->get("WrapperCommand").toString());
 	ui->postExitCmdTextBox->setText(s->get("PostExitCommand").toString());
 }
 

application/pages/global/JavaPage.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>545</width>
-    <height>609</height>
+    <height>559</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -238,7 +238,7 @@
           <string>Custom Commands</string>
          </property>
          <layout class="QGridLayout" name="gridLayout_4">
-          <item row="1" column="0">
+          <item row="3" column="0">
            <widget class="QLabel" name="labelPostExitCmd">
             <property name="text">
              <string>Post-exit command:</string>
@@ -255,9 +255,19 @@
           <item row="0" column="1">
            <widget class="QLineEdit" name="preLaunchCmdTextBox"/>
           </item>
-          <item row="1" column="1">
+          <item row="3" column="1">
            <widget class="QLineEdit" name="postExitCmdTextBox"/>
           </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="labelWrapperCmd">
+            <property name="text">
+             <string>Wrapper command:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QLineEdit" name="wrapperCmdTextBox"/>
+          </item>
          </layout>
         </widget>
        </item>
@@ -270,7 +280,7 @@
           </sizepolicy>
          </property>
          <property name="text">
-          <string>Pre-launch command runs before the instance launches and post-exit command runs after it exits. Both will be run in MultiMC's working directory with INST_ID, INST_DIR, and INST_NAME as environment variables.</string>
+          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Pre-launch command runs before the instance launches and post-exit command runs after it exits. Both will be run in MultiMC's working directory with INST_ID, INST_DIR, and INST_NAME as environment variables.&lt;/p&gt;&lt;p&gt;Wrapper command allows running java using an extra wrapper program (like 'optirun' on Linux)&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="alignment">
           <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
@@ -290,11 +300,15 @@
   <tabstop>minMemSpinBox</tabstop>
   <tabstop>maxMemSpinBox</tabstop>
   <tabstop>permGenSpinBox</tabstop>
-  <tabstop>javaPathTextBox</tabstop>
   <tabstop>javaBrowseBtn</tabstop>
+  <tabstop>javaPathTextBox</tabstop>
   <tabstop>jvmArgsTextBox</tabstop>
+  <tabstop>javaDetectBtn</tabstop>
+  <tabstop>javaTestBtn</tabstop>
   <tabstop>preLaunchCmdTextBox</tabstop>
+  <tabstop>wrapperCmdTextBox</tabstop>
   <tabstop>postExitCmdTextBox</tabstop>
+  <tabstop>tabWidget</tabstop>
  </tabstops>
  <resources/>
  <connections/>

logic/BaseInstance.cpp

@@ -42,6 +42,7 @@ BaseInstance::BaseInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr s
 	// Custom Commands
 	m_settings->registerSetting({"OverrideCommands","OverrideLaunchCmd"}, false);
 	m_settings->registerOverride(globalSettings->getSetting("PreLaunchCommand"));
+	m_settings->registerOverride(globalSettings->getSetting("WrapperCommand"));
 	m_settings->registerOverride(globalSettings->getSetting("PostExitCommand"));
 
 	// Console

logic/minecraft/MinecraftProcess.cpp

@@ -238,8 +238,27 @@ void MinecraftProcess::arm()
 	QString allArgs = args.join(", ");
 	emit log("Java Arguments:\n[" + censorPrivateInfo(allArgs) + "]\n\n");
 
-	// instantiate the launcher part
+	QString wrapperCommand = m_instance->settings()->get("WrapperCommand").toString();
+	if(!wrapperCommand.isEmpty())
+	{
+		auto realWrapperCommand = QStandardPaths::findExecutable(wrapperCommand);
+		if (realWrapperCommand.isEmpty())
+		{
+			emit log(tr("The wrapper command \"%1\" couldn't be found.").arg(wrapperCommand), MessageLevel::Warning);
+			m_instance->cleanupAfterRun();
+			emit launch_failed(m_instance);
+			m_instance->setRunning(false);
+			return;
+		}
+		emit log("Wrapper command is:\n" + wrapperCommand + "\n\n");
+		args.prepend(JavaPath);
+		start(wrapperCommand, args);
+	}
+	else
+	{
 		start(JavaPath, args);
+	}
+
 	if (!waitForStarted())
 	{
 		//: Error message displayed if instace can't start