--- a/src/main.cpp	Tue Jul 19 12:18:57 2016 +0200
+++ b/src/main.cpp	Tue Jul 19 12:19:45 2016 +0200
@@ -16,6 +16,7 @@
 #include "strhelp.h"
 #include "converter.h"
 #include "cconvert_options.h"
+#include "mainwindow.h"
 
 #include <QApplication>
 #include <QCommandLineParser>
@@ -133,19 +134,29 @@
     if (args.size()) {
         infile = args.first();
     }
-    Converter conv(infile, parser.values("output"),
-                   parser.value("title"));
-
-    conv.start();
-    conv.wait();
 
-    const QStringList errors = conv.errors();
-    if (errors.isEmpty()) {
-        return 0;
+    MainWindow *mainWin = Q_NULLPTR;
+    const QStringList outputs = parser.values("output");
+    const QString title = parser.value("title");
+    if (outputs.isEmpty() || title.isEmpty()) {
+        mainWin = new MainWindow();
+        mainWin->setTitle(title);
+        mainWin->show();
+        app.exec();
+        delete mainWin;
     } else {
-        Q_FOREACH (const QString err, errors) {
-            qCritical() << err;
+        Converter conv(infile, parser.values("output"),
+                       parser.value("title"));
+
+        conv.start();
+        conv.wait();
+        const QStringList errors = conv.errors();
+        if (!errors.isEmpty()) {
+            Q_FOREACH (const QString err, errors) {
+                qCritical() << err;
+            }
+            return 1;
         }
     }
-    return 1;
+    return 0;
 }