feat: cli argument to list supported image formats

app/main.cpp

@@ -40,13 +40,20 @@ int main(int argc, char *argv[])
     a.setApplicationName("Pineapple Pictures");
     a.setApplicationDisplayName(QCoreApplication::translate("main", "Pineapple Pictures"));
 
+    // commandline options
+    QCommandLineOption supportedImageFormats(QStringLiteral("supported-image-formats"), QCoreApplication::translate("main", "List supported image format suffixes, and quit program."));
     // parse commandline arguments
     QCommandLineParser parser;
+    parser.addOption(supportedImageFormats);
     parser.addPositionalArgument("File list", QCoreApplication::translate("main", "File list."));
     parser.addHelpOption();
-
     parser.process(a);
 
+    if (parser.isSet(supportedImageFormats)) {
+        fputs(qPrintable(MainWindow::supportedImageFormats().join(QChar('\n'))), stdout);
+        ::exit(EXIT_SUCCESS);
+    }
+
     MainWindow w;
     w.show();
 

app/mainwindow.cpp

@@ -57,12 +57,7 @@ MainWindow::MainWindow(QWidget *parent)
     this->setWindowIcon(QIcon(":/icons/app-icon.svg"));
     this->setMouseTracking(true);
 
-    // related to jfif: https://codereview.qt-project.org/c/qt/qtbase/+/577730
+    m_pm->setAutoLoadFilterSuffixes(supportedImageFormats());
-    QStringList formatFilters{ QStringLiteral("*.jfif") };
-    for (const QByteArray &item : QImageReader::supportedImageFormats()) {
-        formatFilters.append(QStringLiteral("*.") % QString::fromLocal8Bit(item));
-    }
-    m_pm->setAutoLoadFilterSuffixes(formatFilters);
 
     m_fadeOutAnimation = new QPropertyAnimation(this, "windowOpacity");
     m_fadeOutAnimation->setDuration(300);
@@ -278,6 +273,19 @@ void MainWindow::galleryCurrent()
     }
 }
 
+QStringList MainWindow::supportedImageFormats()
+{
+    QStringList formatFilters {
+#if QT_VERSION < QT_VERSION_CHECK(6, 8, 0)
+        QStringLiteral("*.jfif")
+#endif // QT_VERSION < QT_VERSION_CHECK(6, 8, 0)
+    };
+    for (const QByteArray &item : QImageReader::supportedImageFormats()) {
+        formatFilters.append(QStringLiteral("*.") % QString::fromLocal8Bit(item));
+    }
+    return formatFilters;
+}
+
 void MainWindow::showEvent(QShowEvent *event)
 {
     updateWidgetsPosition();

app/mainwindow.h

@@ -47,6 +47,8 @@ public:
     void galleryNext();
     void galleryCurrent();
 
+    static QStringList supportedImageFormats();
+
 protected slots:
     void showEvent(QShowEvent *event) override;
     void enterEvent(QT_ENTER_EVENT *event) override;