Add PythonQtUtils.{h,cpp} with CalamaresUtils::lookupAndCall.

src/libcalamaresui/CMakeLists.txt

@@ -45,6 +45,7 @@ if( WITH_PYTHONQT )
 
     list( APPEND ${CALAMARESUI_LIBRARY_TARGET}_SOURCES
         modulesystem/PythonQtViewModule.cpp
+        utils/PythonQtUtils.cpp
         viewpages/PythonQtViewStep.cpp
     )
     set( OPTIONAL_PRIVATE_LIBRARIES

src/libcalamaresui/utils/PythonQtUtils.cpp

@@ -0,0 +1,44 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2016, Teo Mrnjavac <teo@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "PythonQtUtils.h"
+
+namespace CalamaresUtils
+{
+
+QVariant
+lookupAndCall( PyObject* object,
+               const QStringList& candidateNames,
+               const QVariantList& args,
+               const QVariantMap& kwargs )
+{
+    Q_ASSERT( object );
+    Q_ASSERT( !candidateNames.isEmpty() );
+
+    for ( const QString& name : candidateNames )
+    {
+        PythonQtObjectPtr callable = PythonQt::self()->lookupCallable( object, name );
+        if ( callable )
+            return callable.call( args, kwargs );
+    }
+
+    // If we haven't found a callable with the given names, we force an error:
+    return PythonQt::self()->call( object, candidateNames.first(), args, kwargs );
+}
+
+}

src/libcalamaresui/utils/PythonQtUtils.h

@@ -0,0 +1,38 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2016, Teo Mrnjavac <teo@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PYTHONQTUTILS_H
+#define PYTHONQTUTILS_H
+
+#include <PythonQt.h>
+
+#include <QVariant>
+
+
+namespace CalamaresUtils
+{
+//NOTE: when running this, it is assumed that Python is initialized and
+//      PythonQt::self() is valid.
+QVariant lookupAndCall( PyObject* object,
+                        const QStringList& candidateNames,
+                        const QVariantList& args = QVariantList(),
+                        const QVariantMap& kwargs = QVariantMap() );
+
+} //ns
+
+#endif // PYTHONQTUTILS_H