GH-2988 add --import command-line option

When specified, opens the "Import from zip" dialog as soon as the main
window is shown, with the URL field prefilled with the argument given to
the option.

Closes #2998

application/MainWindow.h

@@ -57,6 +57,8 @@ public:
     void checkInstancePathForProblems();
 
     void updatesAllowedChanged(bool allowed);
+
+    void droppedURLs(QList<QUrl> urls);
 signals:
     void isClosing();
 
@@ -180,8 +182,6 @@ private slots:
      */
     void downloadUpdates(GoUpdate::Status status);
 
-    void droppedURLs(QList<QUrl> urls);
-
     void konamiTriggered();
 
     void globalSettingsClosed();

application/MultiMC.cpp

@@ -34,6 +34,7 @@
 #include <QNetworkAccessManager>
 #include <QTranslator>
 #include <QLibraryInfo>
+#include <QList>
 #include <QStringList>
 #include <QDebug>
 #include <QStyleFactory>
@@ -173,6 +174,10 @@ MultiMC::MultiMC(int &argc, char **argv) : QApplication(argc, argv)
         // --alive
         parser.addSwitch("alive");
         parser.addDocumentation("alive", "Write a small '" + liveCheckFile + "' file after MultiMC starts");
+        // --import
+        parser.addOption("import");
+        parser.addShortOpt("import", 'I');
+        parser.addDocumentation("import", "Import instance from specified zip (local path or URL)");
 
         // parse the arguments
         try
@@ -207,6 +212,7 @@ MultiMC::MultiMC(int &argc, char **argv) : QApplication(argc, argv)
     }
     m_instanceIdToLaunch = args["launch"].toString();
     m_liveCheck = args["alive"].toBool();
+    m_zipToImport = args["import"].toUrl();
 
     QString origcwdPath = QDir::currentPath();
     QString binPath = applicationDirPath();
@@ -278,13 +284,20 @@ MultiMC::MultiMC(int &argc, char **argv) : QApplication(argc, argv)
         connect(m_peerInstance, &LocalPeer::messageReceived, this, &MultiMC::messageReceived);
         if(m_peerInstance->isClient())
         {
+            int timeout = 2000;
+
             if(m_instanceIdToLaunch.isEmpty())
             {
-                m_peerInstance->sendMessage("activate", 2000);
+                m_peerInstance->sendMessage("activate", timeout);
+
+                if(!m_zipToImport.isEmpty())
+                {
+                    m_peerInstance->sendMessage("import " + m_zipToImport.toString(), timeout);
+                }
             }
             else
             {
-                m_peerInstance->sendMessage(m_instanceIdToLaunch, 2000);
+                m_peerInstance->sendMessage("launch " + m_instanceIdToLaunch, timeout);
             }
             m_status = MultiMC::Succeeded;
             return;
@@ -812,6 +825,11 @@ void MultiMC::performMainStartupAction()
         showMainWindow(false);
         qDebug() << "<> Main window shown.";
     }
+    if(!m_zipToImport.isEmpty())
+    {
+        qDebug() << "<> Importing instance from zip:" << m_zipToImport;
+        m_mainWindow->droppedURLs({ m_zipToImport });
+    }
 }
 
 void MultiMC::showFatalErrorMessage(const QString& title, const QString& content)
@@ -848,18 +866,40 @@ void MultiMC::messageReceived(const QString& message)
         qDebug() << "Received message" << message << "while still initializing. It will be ignored.";
         return;
     }
-    if(message == "activate")
+
+    QStringList args = message.split(' ');
+    QString command = args.takeFirst();
+
+    if(command == "activate")
     {
         showMainWindow();
     }
-    else
+    else if(command == "import")
     {
-        auto inst = instances()->getInstanceById(message);
+        if(args.isEmpty())
+        {
+            qWarning() << "Received" << command << "message without a zip path/URL.";
+            return;
+        }
+        m_mainWindow->droppedURLs({ QUrl(args.takeFirst()) });
+    }
+    else if(command == "launch")
+    {
+        if(args.isEmpty())
+        {
+            qWarning() << "Received" << command << "message without an instance ID.";
+            return;
+        }
+        auto inst = instances()->getInstanceById(args.takeFirst());
         if(inst)
         {
             launch(inst, true, nullptr);
         }
     }
+    else
+    {
+        qWarning() << "Received invalid message" << message;
+    }
 }
 
 void MultiMC::analyticsSettingChanged(const Setting&, QVariant value)

application/MultiMC.h

@@ -6,6 +6,7 @@
 #include <QFlag>
 #include <QIcon>
 #include <QDateTime>
+#include <QUrl>
 #include <updater/GoUpdate.h>
 
 #include <BaseInstance.h>
@@ -221,5 +222,6 @@ private:
 public:
     QString m_instanceIdToLaunch;
     bool m_liveCheck = false;
+    QUrl m_zipToImport;
     std::unique_ptr<QFile> logFile;
 };