dragger: use actual argument parsing

src/dragger.cc

@@ -1,4 +1,5 @@
 #include <QApplication>
+#include <QCommandLineParser>
 #include <QDebug>
 #include <QDrag>
 #include <QFile>
@@ -9,10 +10,23 @@
 
 int main(int argc, char* argv[]) {
     QApplication app(argc, argv);
+    QApplication::setApplicationName("dragger");
+    QApplication::setApplicationVersion("0.1.0");
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription("A CLI drag-and-drop tool");
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument(
+        "files",
+        QCoreApplication::translate("files", "files to drag-and-drop"),
+        "[FILES...]");
+
+    parser.process(app);
 
     QList<QUrl> urls;
-    for (int i = 1; i < argc; ++i) {
-        QFileInfo file(QFile(argv[i]));
+    for (auto const& path : parser.positionalArguments()) {
+        QFileInfo file{QFile{path}};
         if (file.exists()) {
             urls << QUrl("file:" + file.absoluteFilePath());
         } else {