support commandline arguments (passing file list only)

main.cpp

@@ -1,12 +1,33 @@
 #include "mainwindow.h"
 #include <QApplication>
+#include <QCommandLineParser>
+#include <QUrl>
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
 
+    // parse commandline arguments
+    QCommandLineParser parser;
+    parser.addPositionalArgument("File list", QCoreApplication::translate("main", "File list."));
+
+    parser.process(a);
+
+    QStringList urlStrList = parser.positionalArguments();
+    QList<QUrl> urlList;
+    for (const QString & str : urlStrList) {
+        QUrl url = QUrl::fromLocalFile(str);
+        if (url.isValid()) {
+            urlList.append(url);
+        }
+    }
+
     MainWindow w;
     w.show();
 
+    if (!urlList.isEmpty()) {
+        w.showUrls(urlList);
+    }
+
     return a.exec();
 }