Accept file path to open as command line argument

mainwindow.cpp

@@ -15,6 +15,7 @@
 #include <unistd.h>
 #include "photocapture.h"
 #include <QSettings>
+#include <QCoreApplication>
 
 #ifdef __linux__
 #include <sys/ioctl.h>
@@ -134,6 +135,20 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     QStringList standardLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
     if(standardLocations.size())
         _lastDir = standardLocations.first();
+
+    QStringList args = QCoreApplication::arguments();
+    args.removeFirst();
+    for(auto &arg : args)
+    {
+        QFileInfo info(arg);
+        if(info.exists())
+        {
+            m_ringList->setFile(info.canonicalFilePath());
+            updateWindowTitle();
+            _lastDir = info.absoluteDir().absolutePath();
+            break;
+        }
+    }
 }
 
 MainWindow::~MainWindow()