GH-253 implement launching instances from command line

application/MultiMC.cpp

@@ -84,6 +84,10 @@ MultiMC::MultiMC(int &argc, char **argv, bool test_mode) : QApplication(argc, ar
 		parser.addShortOpt("dir", 'd');
 		parser.addDocumentation("dir", "use the supplied directory as MultiMC root instead of "
 									   "the binary location (use '.' for current)");
+		// --launch
+		parser.addOption("launch");
+		parser.addShortOpt("launch", 'l');
+		parser.addDocumentation("launch", "launch the specified instance (by instance ID)");
 
 		// parse the arguments
 		try
@@ -135,6 +139,8 @@ MultiMC::MultiMC(int &argc, char **argv, bool test_mode) : QApplication(argc, ar
 		adjustedBy += "Fallback to binary path " + dataPath;
 	}
 
+	launchId = args["launch"].toString();
+
 	if (!ensureFolderPathExists(dataPath) || !QDir::setCurrent(dataPath))
 	{
 		// BAD STUFF. WHAT DO?

application/MultiMC.h

@@ -180,5 +180,6 @@ private:
 
 	Status m_status = MultiMC::Failed;
 public:
+	QString launchId;
 	std::shared_ptr<QFile> logFile;
 };

application/main.cpp

@@ -1,10 +1,11 @@
 #include "MultiMC.h"
 #include "MainWindow.h"
+#include "LaunchInteraction.h"
+#include <InstanceList.h>
+#include <QDebug>
 
-int main_gui(MultiMC &app)
+int launchMainWindow(MultiMC &app)
 {
-	// show main window
-	app.setIconTheme(MMC->settings()->get("IconTheme").toString());
 	MainWindow mainWin;
 	mainWin.restoreState(QByteArray::fromBase64(MMC->settings()->get("MainWindowState").toByteArray()));
 	mainWin.restoreGeometry(QByteArray::fromBase64(MMC->settings()->get("MainWindowGeometry").toByteArray()));
@@ -13,6 +14,29 @@ int main_gui(MultiMC &app)
 	mainWin.checkInstancePathForProblems();
 	return app.exec();
 }
+
+int launchInstance(MultiMC &app, InstancePtr inst)
+{
+	app.minecraftlist();
+	LaunchController launchController;
+	launchController.setInstance(inst);
+	launchController.setOnline(true);
+	launchController.launch();
+	return app.exec();
+}
+
+int main_gui(MultiMC &app)
+{
+	app.setIconTheme(MMC->settings()->get("IconTheme").toString());
+	// show main window
+	auto inst = app.instances()->getInstanceById(app.launchId);
+	if(inst)
+	{
+		return launchInstance(app, inst);
+	}
+	return launchMainWindow(app);
+}
+
 int main(int argc, char *argv[])
 {
 	// initialize Qt

logic/InstanceList.cpp

@@ -362,23 +362,16 @@ int InstanceList::add(InstancePtr t)
 
 InstancePtr InstanceList::getInstanceById(QString instId) const
 {
-	if (m_instances.isEmpty())
-	{
+	if(instId.isEmpty())
 		return InstancePtr();
-	}
-
-	QListIterator<InstancePtr> iter(m_instances);
-	InstancePtr inst;
-	while (iter.hasNext())
+	for(auto & inst: m_instances)
 	{
-		inst = iter.next();
 		if (inst->id() == instId)
-			break;
+		{
+			return inst;
+		}
 	}
-	if (inst->id() != instId)
 	return InstancePtr();
-	else
-		return iter.peekPrevious();
 }
 
 QModelIndex InstanceList::getInstanceIndexById(const QString &id) const