print available layouts from command line

app/importer.cpp

@@ -450,6 +450,22 @@ bool Importer::importHelper(QString fileName)
     return true;
 }
 
+QStringList Importer::availableLayouts()
+{
+    QDir layoutDir(QDir::homePath() + "/.config/latte");
+    QStringList filter;
+    filter.append(QString("*.layout.latte"));
+    QStringList files = layoutDir.entryList(filter, QDir::Files | QDir::NoSymLinks);
+
+    QStringList layoutNames;
+
+    foreach (auto file, files) {
+        layoutNames.append(LayoutSettings::layoutName(file));
+    }
+
+    return layoutNames;
+}
+
 
 QString Importer::nameOfConfigFile(const QString &fileName)
 {

app/importer.h

@@ -69,6 +69,7 @@ public:
     static bool importHelper(QString fileName);
     static QString nameOfConfigFile(const QString &fileName);
     static QString uniqueLayoutName(QString name);
+    static QStringList availableLayouts();
 
 private:
     //! check if this layout exists already in the latte directory

app/main.cpp

@@ -83,6 +83,7 @@ int main(int argc, char **argv)
         , {{"d", "debug"}, i18nc("command line", "Show the debugging messages on stdout.")}
         , {"graphics", i18nc("command line", "Draw boxes around of the applets.")}
         , {"with-window", i18nc("command line", "Open a window with much debug information.")}
+        , {"layouts", i18nc("command line", "Print available layouts")}
         , {"default-layout", i18nc("command line", "Import and load default layout.")}
         , {"import", i18nc("command line", "Import full configuration."), i18nc("command line: import", "file_name")}
         , {"mask", i18nc("command line" , "Show messages of debugging for the mask (Only useful to devs).")}
@@ -92,6 +93,23 @@ int main(int argc, char **argv)
 
     parser.process(app);
 
+    if (parser.isSet(QStringLiteral("layouts"))) {
+        QStringList layouts = Latte::Importer::availableLayouts();
+
+        if (layouts.count() > 0) {
+            qInfo() << i18n("Available layouts that can be used to start Latte:");
+
+            foreach (auto layout, layouts) {
+                qInfo() << "     " << layout;
+            }
+        } else {
+            qInfo() << i18n("There are no available layouts, during startup Default will be used.");
+        }
+
+        qGuiApp->exit();
+        return 0;
+    }
+
     QLockFile lockFile {QDir::tempPath() + "/latte-dock.lock"};
 
     int timeout {100};