Use a proper command line parser

Author: carsonip

src/main.cpp

@@ -1,5 +1,6 @@
 #include "QObject"
 #include "QPushButton"
+#include "QCommandLineParser"
 #include "mainwindow.h"
 #include <QApplication>
 
@@ -10,9 +11,18 @@ int main(int argc, char *argv[]) {
   a.setOrganizationDomain("carsonip.github.io");
   a.setApplicationName("Penguin Subtitle Player");
   a.setApplicationVersion(APP_VERSION);
+
+  QCommandLineParser parser;
+  parser.setApplicationDescription("Penguin Subtitle Player");
+  parser.addHelpOption();
+  parser.addVersionOption();
+  parser.addPositionalArgument("file", QCoreApplication::translate("main", "Subtitle file to play, optionally."), "[file]");
+  parser.process(a);
+  const QStringList args = parser.positionalArguments();
+
   MainWindow w;
-  if (argc > 1) {
-    QString path = a.arguments().at(1);
+  if (args.length() > 0) {
+    QString path = args.at(0);
     w.load(path);
   }
   w.show();