Merge pythonqt branch

CMakeLists.txt

@@ -55,8 +55,9 @@ find_package( Qt5 ${QT_VERSION} CONFIG REQUIRED Core Gui Widgets LinguistTools S
 find_package( YAMLCPP 0.5.1 REQUIRED )
 find_package( PolkitQt5-1 REQUIRED )
 
-option( WITH_PYTHON "Enable Python modules support." ON )
+option( WITH_PYTHON "Enable Python modules API (requires Boost.Python)." ON )
 option( WITH_CRASHREPORTER "Build with CrashReporter" ON )
+option( WITH_PYTHONQT "Enable next generation Python modules API (experimental, requires PythonQt)." OFF )
 
 if( CMAKE_SYSTEM_PROCESSOR MATCHES "arm" OR NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libcrashreporter-qt/CMakeLists.txt" )
     message( STATUS "Build of crashreporter disabled." )
@@ -84,11 +85,23 @@ if ( PYTHONLIBS_FOUND )
         FALSE "1.54.0"
         "Boost.Python is used for interfacing with Calamares job modules written in Python 3."
     )
+
+    macro_optional_find_package( PythonQt )
+    macro_log_feature( PYTHONQT_FOUND
+        "PythonQt"
+        "A Python embedding solution for Qt applications."
+        "http://pythonqt.sourceforge.net"
+        FALSE "3.1"
+        "PythonQt is used for the Python modules API."
+    )
 endif()
 
 if ( PYTHONLIBS_NOTFOUND OR NOT CALAMARES_BOOST_PYTHON3_FOUND )
     set( WITH_PYTHON OFF )
 endif()
+if ( PYTHONLIBS_NOTFOUND OR NOT PYTHONQT_FOUND )
+    set( WITH_PYTHONQT OFF )
+endif()
 
 ###
 ### Calamares application info
@@ -167,8 +180,12 @@ add_subdirectory( src )
 macro_display_feature_log()
 
 if ( NOT WITH_PYTHON )
-    message( "-- WARNING: Building Calamares without Python support. Python modules will not work.\n" )
+    message( "-- WARNING: Building Calamares without Python support. Legacy Python job modules will not work.\n" )
 endif()
+if ( NOT WITH_PYTHONQT )
+    message( "-- WARNING: Building Calamares without PythonQt support. Python modules will not work.\n" )
+endif()
+
 
 # Add all targets to the build-tree export set
 set( CMAKE_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/Calamares" CACHE PATH  "Installation directory for CMake files" )

CMakeModules/FindPythonQt.cmake

@@ -0,0 +1,69 @@
+# Find PythonQt
+#
+# Sets PYTHONQT_FOUND, PYTHONQT_INCLUDE_DIR, PYTHONQT_LIBRARY, PYTHONQT_LIBRARIES
+#
+
+# Python is required
+find_package(PythonLibs)
+if(NOT PYTHONLIBS_FOUND)
+  message(FATAL_ERROR "error: Python is required to build PythonQt")
+endif()
+
+if(NOT EXISTS "${PYTHONQT_INSTALL_DIR}")
+  find_path(PYTHONQT_INSTALL_DIR include/PythonQt/PythonQt.h DOC "Directory where PythonQt was installed.")
+endif()
+# XXX Since PythonQt 3.0 is not yet cmakeified, depending
+#     on how PythonQt is built, headers will not always be
+#     installed in "include/PythonQt". That is why "src"
+#     is added as an option. See [1] for more details.
+#     [1] https://github.com/commontk/CTK/pull/538#issuecomment-86106367
+find_path(PYTHONQT_INCLUDE_DIR PythonQt.h
+  PATHS "${PYTHONQT_INSTALL_DIR}/include/PythonQt"
+        "${PYTHONQT_INSTALL_DIR}/src"
+  DOC "Path to the PythonQt include directory")
+find_library(PYTHONQT_LIBRARY_RELEASE PythonQt PATHS "${PYTHONQT_INSTALL_DIR}/lib" DOC "The PythonQt library.")
+find_library(PYTHONQT_LIBRARY_DEBUG NAMES PythonQt${CTK_CMAKE_DEBUG_POSTFIX} PythonQt${CMAKE_DEBUG_POSTFIX} PythonQt PATHS "${PYTHONQT_INSTALL_DIR}/lib" DOC "The PythonQt library.")
+find_library(PYTHONQT_QTALL_LIBRARY_RELEASE PythonQt_QtAll PATHS "${PYTHONQT_INSTALL_DIR}/lib" DOC "Full Qt bindings for the PythonQt library.")
+find_library(PYTHONQT_QTALL_LIBRARY_DEBUG NAMES PythonQt_QtAll${CTK_CMAKE_DEBUG_POSTFIX} PythonQt_QtAll${CMAKE_DEBUG_POSTFIX} PythonQt_QtAll PATHS "${PYTHONQT_INSTALL_DIR}/lib" DOC "Full Qt bindings for the PythonQt library.")
+
+set(PYTHONQT_LIBRARY)
+
+if(PYTHONQT_LIBRARY_RELEASE)
+  list(APPEND PYTHONQT_LIBRARY optimized ${PYTHONQT_LIBRARY_RELEASE})
+endif()
+if(PYTHONQT_LIBRARY_DEBUG)
+  list(APPEND PYTHONQT_LIBRARY debug ${PYTHONQT_LIBRARY_DEBUG})
+endif()
+
+set(PYTHONQT_QTALL_LIBRARY)
+if(PYTHONQT_QTALL_LIBRARY_RELEASE)
+  list(APPEND PYTHONQT_QTALL_LIBRARY optimized ${PYTHONQT_QTALL_LIBRARY_RELEASE})
+endif()
+if(PYTHONQT_QTALL_LIBRARY_DEBUG)
+  list(APPEND PYTHONQT_QTALL_LIBRARY debug ${PYTHONQT_QTALL_LIBRARY_DEBUG})
+endif()
+
+mark_as_advanced(PYTHONQT_INSTALL_DIR)
+mark_as_advanced(PYTHONQT_INCLUDE_DIR)
+mark_as_advanced(PYTHONQT_LIBRARY_RELEASE)
+mark_as_advanced(PYTHONQT_LIBRARY_DEBUG)
+mark_as_advanced(PYTHONQT_QTALL_LIBRARY_RELEASE)
+mark_as_advanced(PYTHONQT_QTALL_LIBRARY_DEBUG)
+
+# On linux, also find libutil
+if(UNIX AND NOT APPLE)
+  find_library(PYTHONQT_LIBUTIL util)
+  mark_as_advanced(PYTHONQT_LIBUTIL)
+endif()
+
+# All upper case _FOUND variable is maintained for backwards compatibility.
+set(PYTHONQT_FOUND 0)
+set(PythonQt_FOUND 0)
+if(PYTHONQT_INCLUDE_DIR AND PYTHONQT_LIBRARY AND PYTHONQT_QTALL_LIBRARY)
+  # Currently CMake'ified PythonQt only supports building against a python Release build.
+  # This applies independently of CTK build type (Release, Debug, ...)
+  add_definitions(-DPYTHONQT_USE_RELEASE_PYTHON_FALLBACK)
+  set(PYTHONQT_FOUND 1)
+  set(PythonQt_FOUND ${PYTHONQT_FOUND})
+  set(PYTHONQT_LIBRARIES ${PYTHONQT_LIBRARY} ${PYTHONQT_LIBUTIL} ${PYTHONQT_QTALL_LIBRARY})
+endif()

src/libcalamares/CMakeLists.txt

@@ -58,6 +58,20 @@ if( WITH_PYTHON )
     )
 endif()
 
+if( WITH_PYTHONQT )
+    include_directories(${PYTHON_INCLUDE_DIRS})
+    link_directories(${PYTHON_LIBRARIES})
+
+    include_directories(${PYTHONQT_INCLUDE_DIR})
+    link_directories(${PYTHONQT_LIBRARY})
+
+    set( OPTIONAL_PRIVATE_LIBRARIES
+        ${OPTIONAL_PRIVATE_LIBRARIES}
+        ${PYTHON_LIBRARIES}
+        ${PYTHONQT_LIBRARY}
+    )
+endif()
+
 
 add_library( calamares SHARED ${libSources} )
 set_target_properties( calamares

src/libcalamares/CalamaresConfig.h.in

@@ -11,5 +11,6 @@
 //cmakedefines for CMake variables (e.g. for optdepends) go here
 #cmakedefine WITH_PYTHON
 #cmakedefine WITH_CRASHREPORTER
+#cmakedefine WITH_PYTHONQT
 
 #endif // CALAMARESCONFIG_H

src/libcalamares/Job.h

@@ -29,37 +29,33 @@ namespace Calamares {
 class DLLEXPORT JobResult
 {
 public:
-    operator bool() const;
+    virtual ~JobResult() {}
 
-    QString message() const;
-    void setMessage( const QString& message );
+    virtual operator bool() const;
 
-    QString details() const;
-    void setDetails( const QString& details );
+    virtual QString message() const;
+    virtual void setMessage( const QString& message );
+
+    virtual QString details() const;
+    virtual void setDetails( const QString& details );
 
     static JobResult ok();
 
     static JobResult error( const QString& message, const QString& details = QString() );
 
+protected:
+    explicit JobResult( bool ok, const QString& message, const QString& details );
+
 private:
     bool m_ok;
     QString m_message;
     QString m_details;
-
-    JobResult( bool ok, const QString& message, const QString& details );
 };
 
 class DLLEXPORT Job : public QObject
 {
     Q_OBJECT
 public:
-    enum State
-    {
-        Pending = 0,
-        Running,
-        Finished
-    };
-
     explicit Job( QObject* parent = nullptr );
     virtual ~Job();
 

src/libcalamares/PythonHelper.cpp

@@ -189,7 +189,8 @@ Helper::Helper( QObject* parent )
     // Let's make extra sure we only call Py_Initialize once
     if ( !s_instance )
     {
-        Py_Initialize();
+        if ( !Py_IsInitialized() )
+            Py_Initialize();
 
         m_mainModule = bp::import( "__main__" );
         m_mainNamespace = m_mainModule.attr( "__dict__" );

src/libcalamaresui/CMakeLists.txt

@@ -39,6 +39,25 @@ if( WITH_PYTHON )
     )
 endif()
 
+if( WITH_PYTHONQT )
+    include_directories(${PYTHON_INCLUDE_DIRS})
+    include_directories(${PYTHONQT_INCLUDE_DIR})
+
+    list( APPEND ${CALAMARESUI_LIBRARY_TARGET}_SOURCES
+        modulesystem/PythonQtViewModule.cpp
+        utils/PythonQtUtils.cpp
+        viewpages/PythonQtJob.cpp
+        viewpages/PythonQtViewStep.cpp
+        viewpages/PythonQtGlobalStorageWrapper.cpp
+        viewpages/PythonQtUtilsWrapper.cpp
+    )
+    set( OPTIONAL_PRIVATE_LIBRARIES
+        ${OPTIONAL_PRIVATE_LIBRARIES}
+        ${PYTHON_LIBRARIES}
+        ${PYTHONQT_LIBRARIES}
+    )
+endif()
+
 calamares_add_library( ${CALAMARESUI_LIBRARY_TARGET}
     SOURCES ${${CALAMARESUI_LIBRARY_TARGET}_SOURCES}
     UI ${${CALAMARESUI_LIBRARY_TARGET}_UI}
@@ -47,6 +66,7 @@ calamares_add_library( ${CALAMARESUI_LIBRARY_TARGET}
         yaml-cpp
         Qt5::Svg
 	Qt5::QuickWidgets
+        ${OPTIONAL_PRIVATE_LIBRARIES}
     RESOURCES libcalamaresui.qrc
     EXPORT CalamaresLibraryDepends
     VERSION ${CALAMARES_VERSION_SHORT}

src/libcalamaresui/modulesystem/CppJobModule.cpp

@@ -39,7 +39,7 @@ CppJobModule::type() const
 Module::Interface
 CppJobModule::interface() const
 {
-    return QtPlugin;
+    return QtPluginInterface;
 }
 
 

src/libcalamaresui/modulesystem/Module.cpp

@@ -31,6 +31,10 @@
 #include "PythonJobModule.h"
 #endif
 
+#ifdef WITH_PYTHONQT
+#include "PythonQtViewModule.h"
+#endif
+
 #include <yaml-cpp/yaml.h>
 
 #include <QDir>
@@ -71,9 +75,18 @@ Module::fromDescriptor( const QVariantMap& moduleDescriptor,
                << instanceId;
         return nullptr;
     }
-    if ( typeString == "view" && intfString == "qtplugin" )
+    if ( typeString == "view" )
     {
-        m = new ViewModule();
+        if ( intfString == "qtplugin" )
+        {
+            m = new ViewModule();
+        }
+#ifdef WITH_PYTHONQT
+        else if ( intfString == "pythonqt" )
+        {
+            m = new PythonQtViewModule();
+        }
+#endif
     }
     else if ( typeString == "job" )
     {
@@ -215,6 +228,38 @@ Module::location() const
 }
 
 
+QString
+Module::typeString() const
+{
+    switch ( type() )
+    {
+    case Job:
+        return "Job Module";
+    case View:
+        return "View Module";
+    }
+    return QString();
+}
+
+
+QString
+Module::interfaceString() const
+{
+    switch ( interface() )
+    {
+    case ProcessInterface:
+        return "External process";
+    case PythonInterface:
+        return "Python (Boost.Python)";
+    case PythonQtInterface:
+        return "Python (experimental)";
+    case QtPluginInterface:
+        return "Qt Plugin";
+    }
+    return QString();
+}
+
+
 bool
 Module::isLoaded() const
 {

src/libcalamaresui/modulesystem/Module.h

@@ -48,9 +48,10 @@ public:
 
     enum Interface
     {
-        QtPlugin,
-        Python,
-        Process
+        QtPluginInterface,
+        PythonInterface,
+        ProcessInterface,
+        PythonQtInterface
     };
     virtual ~Module();
 
@@ -65,7 +66,9 @@ public:
     virtual QStringList requiredModules() const;
     virtual QString location() const final;
     virtual Type type() const = 0;
+    virtual QString typeString() const;
     virtual Interface interface() const = 0;
+    virtual QString interfaceString() const;
 
     virtual bool isLoaded() const;
 

src/libcalamaresui/modulesystem/ProcessJobModule.cpp

@@ -35,7 +35,7 @@ ProcessJobModule::type() const
 Module::Interface
 ProcessJobModule::interface() const
 {
-    return Process;
+    return ProcessInterface;
 }
 
 

src/libcalamaresui/modulesystem/PythonJobModule.cpp

@@ -36,7 +36,7 @@ PythonJobModule::type() const
 Module::Interface
 PythonJobModule::interface() const
 {
-    return Python;
+    return PythonInterface;
 }
 
 

src/libcalamaresui/modulesystem/PythonQtViewModule.cpp

@@ -0,0 +1,203 @@
+/* === 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 "PythonQtViewModule.h"
+
+#include "utils/Logger.h"
+#include "viewpages/ViewStep.h"
+#include "viewpages/PythonQtViewStep.h"
+#include "ViewManager.h"
+#include "CalamaresConfig.h"
+#include "viewpages/PythonQtGlobalStorageWrapper.h"
+#include "viewpages/PythonQtUtilsWrapper.h"
+#include "GlobalStorage.h"
+#include "JobQueue.h"
+
+#include <PythonQt.h>
+#include <extensions/PythonQt_QtAll/PythonQt_QtAll.h>
+
+#include <QDir>
+#include <QPointer>
+
+
+static QPointer< GlobalStorage > s_gs = nullptr;
+static QPointer< Utils > s_utils = nullptr;
+
+namespace Calamares {
+
+Module::Type
+PythonQtViewModule::type() const
+{
+    return View;
+}
+
+
+Module::Interface
+PythonQtViewModule::interface() const
+{
+    return PythonQtInterface;
+}
+
+
+void
+PythonQtViewModule::loadSelf()
+{
+    if ( !m_scriptFileName.isEmpty() )
+    {
+        if ( PythonQt::self() == nullptr )
+        {
+            if ( Py_IsInitialized() )
+                PythonQt::init( PythonQt::IgnoreSiteModule |
+                                PythonQt::RedirectStdOut |
+                                PythonQt::PythonAlreadyInitialized );
+            else
+                PythonQt::init();
+
+            PythonQt_QtAll::init();
+            cDebug() << "Initializing PythonQt bindings."
+                     << "This should only happen once.";
+
+            //TODO: register classes here into the PythonQt environment, like this:
+            //PythonQt::self()->registerClass( &PythonQtViewStep::staticMetaObject,
+            //                                 "calamares" );
+
+            // We only do the following to force PythonQt to create a submodule
+            // "calamares" for us to put our static objects in
+            PythonQt::self()->registerClass( &::GlobalStorage::staticMetaObject,
+                                             "calamares" );
+
+            // Get a PythonQtObjectPtr to the PythonQt.calamares submodule
+            PythonQtObjectPtr pqtm = PythonQt::priv()->pythonQtModule();
+            PythonQtObjectPtr cala = PythonQt::self()->lookupObject( pqtm, "calamares" );
+
+            // Prepare GlobalStorage object, in module PythonQt.calamares
+            if ( !s_gs )
+                s_gs = new ::GlobalStorage( Calamares::JobQueue::instance()->globalStorage() );
+            cala.addObject( "global_storage", s_gs );
+
+            // Prepare Utils object, in module PythonQt.calamares
+            if ( !s_utils )
+                s_utils = new ::Utils( Calamares::JobQueue::instance()->globalStorage() );
+            cala.addObject( "utils", s_utils );
+
+            // Basic stdout/stderr handling
+            QObject::connect( PythonQt::self(), &PythonQt::pythonStdOut,
+                     []( const QString& message )
+            {
+                cDebug() << "PythonQt OUT>" << message;
+            } );
+            QObject::connect( PythonQt::self(), &PythonQt::pythonStdErr,
+                     []( const QString& message )
+            {
+                cDebug() << "PythonQt ERR>" << message;
+            } );
+
+        }
+
+        QDir workingDir( m_workingPath );
+        if ( !workingDir.exists() )
+        {
+            cDebug() << "Invalid working directory"
+                     << m_workingPath
+                     << "for module"
+                     << name();
+            return;
+        }
+
+        QString fullPath = workingDir.absoluteFilePath( m_scriptFileName );
+        QFileInfo scriptFileInfo( fullPath );
+        if ( !scriptFileInfo.isReadable() )
+        {
+            cDebug() << "Invalid main script file path"
+                     << fullPath
+                     << "for module"
+                     << name();
+            return;
+        }
+
+        // Construct empty Python module with the given name
+        PythonQtObjectPtr cxt =
+                PythonQt::self()->
+                createModuleFromScript( name() );
+        if ( cxt.isNull() )
+        {
+            cDebug() << "Cannot load PythonQt context from file"
+                     << fullPath
+                     << "for module"
+                     << name();
+            return;
+        }
+
+        QString calamares_module_annotation =
+                "_calamares_module_typename = 'foo'\n"
+                "def calamares_module(viewmodule_type):\n"
+                "    global _calamares_module_typename\n"
+                "    _calamares_module_typename = viewmodule_type.__name__\n"
+                "    return viewmodule_type\n";
+
+        // Load in the decorator
+        PythonQt::self()->evalScript( cxt, calamares_module_annotation );
+
+        // Load the module
+        PythonQt::self()->evalFile( cxt, fullPath );
+
+        m_viewStep = new PythonQtViewStep( cxt );
+
+        cDebug() << "PythonQtViewModule loading self for instance" << instanceKey()
+                 << "\nPythonQtViewModule at address" << this
+                 << "\nViewStep at address" << m_viewStep;
+
+        m_viewStep->setModuleInstanceKey( instanceKey() );
+        m_viewStep->setConfigurationMap( m_configurationMap );
+        ViewManager::instance()->addViewStep( m_viewStep );
+        m_loaded = true;
+        cDebug() << "PythonQtViewModule" << instanceKey() << "loading complete.";
+    }
+}
+
+
+QList< job_ptr >
+PythonQtViewModule::jobs() const
+{
+    return m_viewStep->jobs();
+}
+
+
+void
+PythonQtViewModule::initFrom( const QVariantMap& moduleDescriptor )
+{
+    Module::initFrom( moduleDescriptor );
+    QDir directory( location() );
+    m_workingPath = directory.absolutePath();
+
+    if ( !moduleDescriptor.value( "script" ).toString().isEmpty() )
+    {
+        m_scriptFileName = moduleDescriptor.value( "script" ).toString();
+    }
+}
+
+PythonQtViewModule::PythonQtViewModule()
+    : Module()
+{
+}
+
+PythonQtViewModule::~PythonQtViewModule()
+{
+}
+
+} // namespace Calamares

src/libcalamaresui/modulesystem/PythonQtViewModule.h

@@ -0,0 +1,54 @@
+/* === 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 CALAMARES_PYTHONQTVIEWMODULE_H
+#define CALAMARES_PYTHONQTVIEWMODULE_H
+
+#include "UiDllMacro.h"
+#include "Module.h"
+
+namespace Calamares {
+
+class ViewStep;
+
+class UIDLLEXPORT PythonQtViewModule : public Module
+{
+public:
+    Type type() const override;
+    Interface interface() const override;
+
+    void loadSelf() override;
+    QList< job_ptr > jobs() const override;
+
+protected:
+    void initFrom( const QVariantMap& moduleDescriptor ) override;
+
+private:
+    friend class Module; //so only the superclass can instantiate
+    explicit PythonQtViewModule();
+    virtual ~PythonQtViewModule();
+
+    ViewStep* m_viewStep = nullptr;
+
+    QString m_scriptFileName;
+    QString m_workingPath;
+};
+
+} // namespace Calamares
+
+#endif // CALAMARES_PYTHONQTVIEWMODULE_H

src/libcalamaresui/modulesystem/ViewModule.cpp

@@ -39,7 +39,7 @@ ViewModule::type() const
 Module::Interface
 ViewModule::interface() const
 {
-    return QtPlugin;
+    return QtPluginInterface;
 }
 
 

src/libcalamaresui/utils/DebugWindow.cpp

@@ -26,6 +26,12 @@
 #include "modulesystem/ModuleManager.h"
 #include "modulesystem/Module.h"
 
+#ifdef WITH_PYTHONQT
+#include <gui/PythonQtScriptingConsole.h>
+#include "ViewManager.h"
+#include "viewpages/PythonQtViewStep.h"
+#endif
+
 #include <QJsonDocument>
 #include <QSplitter>
 #include <QStringListModel>
@@ -68,11 +74,6 @@ DebugWindow::DebugWindow()
     } );
 
     // Modules page
-    QSplitter* splitter = new QSplitter( modulesTab );
-    modulesTab->layout()->addWidget( splitter );
-    splitter->addWidget( modulesListView );
-    splitter->addWidget( moduleConfigView );
-
     QStringListModel* modulesModel = new QStringListModel( ModuleManager::instance()->loadedInstanceKeys() );
     modulesListView->setModel( modulesModel );
     modulesListView->setSelectionMode( QAbstractItemView::SingleSelection );
@@ -80,8 +81,76 @@ DebugWindow::DebugWindow()
     QJsonModel* moduleConfigModel = new QJsonModel( this );
     moduleConfigView->setModel( moduleConfigModel );
 
+#ifdef WITH_PYTHONQT
+    QPushButton* pythonConsoleButton = new QPushButton;
+    pythonConsoleButton->setText( "Attach Python console" );
+    modulesVerticalLayout->insertWidget( 1, pythonConsoleButton );
+    pythonConsoleButton->hide();
+
+    QObject::connect( pythonConsoleButton, &QPushButton::clicked,
+                      this, [ this, moduleConfigModel ]
+    {
+        QString moduleName = modulesListView->currentIndex().data().toString();
+        Module* module = ModuleManager::instance()->moduleInstance( moduleName );
+        if ( module->interface() != Module::PythonQtInterface ||
+             module->type() != Module::View )
+            return;
+
+        for ( ViewStep* step : ViewManager::instance()->viewSteps() )
+        {
+            if ( step->moduleInstanceKey() == module->instanceKey() )
+            {
+                PythonQtViewStep* pqvs =
+                    qobject_cast< PythonQtViewStep* >( step );
+                if ( pqvs )
+                {
+                    QWidget* consoleWindow = new QWidget;
+
+                    QWidget* console = pqvs->createScriptingConsole();
+                    console->setParent( consoleWindow );
+
+                    QVBoxLayout* layout = new QVBoxLayout;
+                    consoleWindow->setLayout( layout );
+                    layout->addWidget( console );
+
+                    QHBoxLayout* bottomLayout = new QHBoxLayout;
+                    layout->addLayout( bottomLayout );
+
+                    QLabel* bottomLabel = new QLabel( consoleWindow );
+                    bottomLayout->addWidget( bottomLabel );
+                    QString line =
+                        QString( "Module: <font color=\"#008000\"><code>%1</code></font><br/>"
+                                 "Python class: <font color=\"#008000\"><code>%2</code></font>" )
+                            .arg( module->instanceKey() )
+                            .arg( console->property( "classname" ).toString() );
+                    bottomLabel->setText( line );
+
+                    QPushButton* closeButton = new QPushButton( consoleWindow );
+                    closeButton->setText( "&Close" );
+                    QObject::connect( closeButton, &QPushButton::clicked,
+                                      [ consoleWindow ]
+                    {
+                        consoleWindow->close();
+                    } );
+                    bottomLayout->addWidget( closeButton );
+                    bottomLabel->setSizePolicy( QSizePolicy::Expanding,
+                                                QSizePolicy::Preferred );
+
+                    consoleWindow->setParent( this );
+                    consoleWindow->setWindowFlags( Qt::Window );
+                    consoleWindow->setWindowTitle( "Calamares Python console" );
+                    consoleWindow->setAttribute( Qt::WA_DeleteOnClose, true );
+                    consoleWindow->showNormal();
+                    break;
+                }
+            }
+        }
+    } );
+
+#endif
+
     connect( modulesListView->selectionModel(), &QItemSelectionModel::selectionChanged,
-             this, [ this, moduleConfigModel ]
+             this, [ this, moduleConfigModel, pythonConsoleButton ]
     {
         QString moduleName = modulesListView->currentIndex().data().toString();
         Module* module = ModuleManager::instance()->moduleInstance( moduleName );
@@ -89,6 +158,13 @@ DebugWindow::DebugWindow()
         {
             moduleConfigModel->loadJson( QJsonDocument::fromVariant( module->configurationMap() ).toJson() );
             moduleConfigView->expandAll();
+            moduleTypeLabel->setText( module->typeString() );
+            moduleInterfaceLabel->setText( module->interfaceString() );
+#ifdef WITH_PYTHONQT
+            pythonConsoleButton->setVisible(
+                        module->interface() == Module::PythonQtInterface &&
+                        module->type() == Module::View );
+#endif
         }
     } );
 

src/libcalamaresui/utils/DebugWindow.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>632</width>
-    <height>497</height>
+    <width>962</width>
+    <height>651</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -17,7 +17,7 @@
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
-      <number>0</number>
+      <number>2</number>
      </property>
      <widget class="QWidget" name="globalStorageTab">
       <attribute name="title">
@@ -48,7 +48,43 @@
         <widget class="QListView" name="modulesListView"/>
        </item>
        <item>
-        <widget class="QTreeView" name="moduleConfigView"/>
+        <layout class="QVBoxLayout" name="modulesVerticalLayout">
+         <item>
+          <layout class="QFormLayout" name="formLayout">
+           <item row="0" column="0">
+            <widget class="QLabel" name="label">
+             <property name="text">
+              <string>Type:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="0" column="1">
+            <widget class="QLabel" name="moduleTypeLabel">
+             <property name="text">
+              <string>none</string>
+             </property>
+            </widget>
+           </item>
+           <item row="1" column="0">
+            <widget class="QLabel" name="label_2">
+             <property name="text">
+              <string>Interface:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="1" column="1">
+            <widget class="QLabel" name="moduleInterfaceLabel">
+             <property name="text">
+              <string>none</string>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </item>
+         <item>
+          <widget class="QTreeView" name="moduleConfigView"/>
+         </item>
+        </layout>
        </item>
       </layout>
      </widget>

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

src/libcalamaresui/viewpages/PythonQtGlobalStorageWrapper.cpp

@@ -0,0 +1,69 @@
+/* === 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 "PythonQtGlobalStorageWrapper.h"
+
+#include "GlobalStorage.h"
+
+
+GlobalStorage::GlobalStorage( Calamares::GlobalStorage* gs )
+    : QObject( gs )
+    , m_gs( gs )
+{}
+
+
+bool
+GlobalStorage::contains( const QString& key ) const
+{
+    return m_gs->contains( key );
+}
+
+
+int
+GlobalStorage::count() const
+{
+    return m_gs->count();
+}
+
+
+void
+GlobalStorage::insert( const QString& key, const QVariant& value )
+{
+    m_gs->insert( key, value );
+}
+
+
+QStringList
+GlobalStorage::keys() const
+{
+    return m_gs->keys();
+}
+
+
+int
+GlobalStorage::remove( const QString& key )
+{
+    return m_gs->remove( key );
+}
+
+
+QVariant
+GlobalStorage::value( const QString& key ) const
+{
+    return m_gs->value( key );
+}

src/libcalamaresui/viewpages/PythonQtGlobalStorageWrapper.h

@@ -0,0 +1,55 @@
+/* === 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 PYTHONQTGLOBALSTORAGEWRAPPER_H
+#define PYTHONQTGLOBALSTORAGEWRAPPER_H
+
+
+#include <QObject>
+
+namespace Calamares
+{
+class GlobalStorage;
+}
+
+
+/**
+ * @brief This GlobalStorage class is a namespace-free wrapper for
+ *        Calamares::GlobalStorage. This is unfortunately a necessity
+ *        because PythonQt doesn't like namespaces.
+ */
+class GlobalStorage : public QObject
+{
+    Q_OBJECT
+public:
+    explicit GlobalStorage( Calamares::GlobalStorage* gs );
+    virtual ~GlobalStorage() {}
+
+public slots:
+    bool contains( const QString& key ) const;
+    int count() const;
+    void insert( const QString& key, const QVariant& value );
+    QStringList keys() const;
+    int remove( const QString& key );
+    QVariant value( const QString& key ) const;
+
+private:
+    Calamares::GlobalStorage* m_gs;
+};
+
+#endif // PYTHONQTGLOBALSTORAGEWRAPPER_H

src/libcalamaresui/viewpages/PythonQtJob.cpp

@@ -0,0 +1,77 @@
+/* === 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 "PythonQtJob.h"
+
+#include "utils/PythonQtUtils.h"
+
+PythonQtJob::PythonQtJob( PythonQtObjectPtr cxt,
+                          PythonQtObjectPtr pyJob,
+                          QObject* parent )
+    : Calamares::Job( parent )
+    , m_cxt( cxt )
+    , m_pyJob( pyJob )
+{
+
+}
+
+
+QString
+PythonQtJob::prettyName() const
+{
+    return CalamaresUtils::lookupAndCall( m_pyJob,
+                                          { "prettyName",
+                                            "prettyname",
+                                            "pretty_name" } ).toString();
+}
+
+
+QString
+PythonQtJob::prettyDescription() const
+{
+    return CalamaresUtils::lookupAndCall( m_pyJob,
+                                          { "prettyDescription",
+                                            "prettydescription",
+                                            "pretty_description" } ).toString();
+}
+
+
+QString
+PythonQtJob::prettyStatusMessage() const
+{
+    return CalamaresUtils::lookupAndCall( m_pyJob,
+                                          { "prettyStatusMessage",
+                                            "prettystatusmessage",
+                                            "pretty_status_message" } ).toString();
+}
+
+
+Calamares::JobResult
+PythonQtJob::exec()
+{
+    QVariant response = m_pyJob.call( "exec" );
+    if ( response.isNull() )
+        return Calamares::JobResult::ok();
+
+    QVariantMap map = response.toMap();
+    if ( map.isEmpty() || map.value( "ok" ).toBool() )
+        return Calamares::JobResult::ok();
+
+    return Calamares::JobResult::error( map.value( "message" ).toString(),
+                                        map.value( "details" ).toString() );
+}

src/libcalamaresui/viewpages/PythonQtJob.h

@@ -0,0 +1,65 @@
+/* === 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 PYTHONQTJOB_H
+#define PYTHONQTJOB_H
+
+#include "Job.h"
+
+#include <PythonQt.h>
+
+namespace Calamares
+{
+class PythonQtViewStep;
+}
+
+class PythonQtJobResult : public QObject, public Calamares::JobResult
+{
+    Q_OBJECT
+public:
+    explicit PythonQtJobResult( bool ok,
+                                const QString& message,
+                                const QString& details )
+        : QObject( nullptr )
+        , Calamares::JobResult( ok, message, details )
+    {}
+};
+
+
+class PythonQtJob : public Calamares::Job
+{
+    Q_OBJECT
+public:
+    virtual ~PythonQtJob() {}
+
+    QString prettyName() const override;
+    QString prettyDescription() const override;
+    QString prettyStatusMessage() const override;
+    Calamares::JobResult exec() override;
+
+private:
+    explicit PythonQtJob( PythonQtObjectPtr cxt,
+                          PythonQtObjectPtr pyJob,
+                          QObject* parent = nullptr );
+    friend class Calamares::PythonQtViewStep; // only this one can call the ctor
+
+    PythonQtObjectPtr m_cxt;
+    PythonQtObjectPtr m_pyJob;
+};
+
+#endif // PYTHONQTJOB_H

src/libcalamaresui/viewpages/PythonQtUtilsWrapper.cpp

@@ -0,0 +1,146 @@
+/* === 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 "PythonQtUtilsWrapper.h"
+
+#include "utils/CalamaresUtilsSystem.h"
+#include "utils/CalamaresUtils.h"
+#include "utils/Logger.h"
+
+#include <PythonQt.h>
+
+
+Utils::Utils(QObject* parent)
+    : QObject( parent )
+    , m_exceptionCxt( PythonQt::self()->createUniqueModule() )
+{
+    PythonQt::self()->evalScript( m_exceptionCxt, "import subprocess" );
+}
+
+
+void
+Utils::debug(const QString& s) const
+{
+    cDebug() << "PythonQt DBG>" << s;
+}
+
+
+int
+Utils::mount( const QString& device_path,
+              const QString& mount_point,
+              const QString& filesystem_name,
+              const QString& options ) const
+{
+    return CalamaresUtils::System::instance()->
+            mount( device_path, mount_point, filesystem_name, options );
+}
+
+
+int
+Utils::target_env_call( const QString& command,
+                        const QString& stdin,
+                        int timeout ) const
+{
+    return CalamaresUtils::System::instance()->
+            targetEnvCall( command, QString(), stdin, timeout );
+}
+
+
+int
+Utils::target_env_call( const QStringList& args,
+                        const QString& stdin,
+                        int timeout ) const
+{
+    return CalamaresUtils::System::instance()->
+            targetEnvCall( args, QString(), stdin, timeout );
+}
+
+
+int
+Utils::check_target_env_call( const QString& command,
+                              const QString& stdin,
+                              int timeout ) const
+{
+    int ec = target_env_call( command, stdin, timeout );
+    return _handle_check_target_env_call_error( ec, command );
+}
+
+
+int
+Utils::check_target_env_call( const QStringList& args,
+                              const QString& stdin,
+                              int timeout) const
+{
+    int ec = target_env_call( args, stdin, timeout );
+    return _handle_check_target_env_call_error( ec, args.join( ' ' ) );
+}
+
+
+QString
+Utils::check_target_env_output( const QString& command,
+                                const QString& stdin,
+                                int timeout ) const
+{
+    QString output;
+    int ec = CalamaresUtils::System::instance()->
+             targetEnvOutput( command,
+                              output,
+                              QString(),
+                              stdin,
+                              timeout );
+    _handle_check_target_env_call_error( ec, command );
+    return output;
+}
+
+
+QString
+Utils::check_target_env_output( const QStringList& args,
+                                const QString& stdin,
+                                int timeout ) const
+{
+    QString output;
+    int ec = CalamaresUtils::System::instance()->
+             targetEnvOutput( args,
+                              output,
+                              QString(),
+                              stdin,
+                              timeout );
+    _handle_check_target_env_call_error( ec, args.join( ' ' ) );
+    return output;
+}
+
+
+QString
+Utils::obscure( const QString& string ) const
+{
+    return CalamaresUtils::obscure( string );
+}
+
+
+int
+Utils::_handle_check_target_env_call_error( int ec, const QString& cmd) const
+{
+    if ( ec )
+    {
+        QString raise = QString( "raise subprocess.CalledProcessError(%1,\"%2\")" )
+                        .arg( ec )
+                        .arg( cmd );
+        PythonQt::self()->evalScript( m_exceptionCxt, raise );
+    }
+    return ec;
+}

src/libcalamaresui/viewpages/PythonQtUtilsWrapper.h

@@ -0,0 +1,74 @@
+/* === 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 PYTHONQTUTILSWRAPPER_H
+#define PYTHONQTUTILSWRAPPER_H
+
+#include <PythonQtObjectPtr.h>
+
+#include <QObject>
+
+
+class Utils : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Utils( QObject* parent = nullptr );
+    virtual ~Utils() {}
+
+public slots:
+    void debug( const QString& s ) const;
+
+    int mount( const QString& device_path,
+               const QString& mount_point,
+               const QString& filesystem_name,
+               const QString& options ) const;
+
+    int target_env_call( const QString& command,
+                         const QString& stdin = QString(),
+                         int timeout = 0 ) const;
+
+    int target_env_call( const QStringList& args,
+                         const QString& stdin = QString(),
+                         int timeout = 0 ) const;
+
+    int check_target_env_call( const QString& command,
+                               const QString& stdin = QString(),
+                               int timeout = 0 ) const;
+
+    int check_target_env_call( const QStringList& args,
+                               const QString& stdin = QString(),
+                               int timeout = 0 ) const;
+
+    QString check_target_env_output( const QString& command,
+                                     const QString& stdin = QString(),
+                                     int timeout = 0 ) const;
+
+    QString check_target_env_output( const QStringList& args,
+                                     const QString& stdin = QString(),
+                                     int timeout = 0 ) const;
+
+    QString obscure( const QString& string ) const;
+
+private:
+    inline int _handle_check_target_env_call_error( int ec, const QString& cmd ) const;
+
+    PythonQtObjectPtr m_exceptionCxt;
+};
+
+#endif // PYTHONQTUTILSWRAPPER_H

src/libcalamaresui/viewpages/PythonQtViewStep.cpp

@@ -0,0 +1,206 @@
+/* === 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 "PythonQtViewStep.h"
+#include "utils/Logger.h"
+#include "utils/CalamaresUtilsGui.h"
+#include "utils/PythonQtUtils.h"
+#include "utils/Retranslator.h"
+#include "viewpages/PythonQtJob.h"
+
+#include <gui/PythonQtScriptingConsole.h>
+
+#include <QBoxLayout>
+#include <QWidget>
+
+
+namespace Calamares
+{
+
+PythonQtViewStep::PythonQtViewStep( PythonQtObjectPtr cxt,
+                                    QObject* parent )
+    : ViewStep( parent )
+    , m_widget( new QWidget() )
+    , m_cxt( cxt )
+{
+    PythonQt* pq = PythonQt::self();
+    Q_ASSERT( pq );
+
+    // The @calamares_module decorator should have filled _calamares_module_typename
+    // for us.
+    QString className = m_cxt.getVariable( "_calamares_module_typename" ).toString();
+
+    // Instantiate an object of the class marked with @calamares_module and
+    // store it as _calamares_module.
+    pq->evalScript( m_cxt, QString( "_calamares_module = %1()" )
+                                            .arg( className ) );
+    m_obj = pq->lookupObject( m_cxt, "_calamares_module" );
+
+    Q_ASSERT( !m_obj.isNull() );    // no entry point, no party
+
+    // Prepare the base widget for the module's pages
+    m_widget->setLayout( new QVBoxLayout );
+    CalamaresUtils::unmarginLayout( m_widget->layout() );
+    m_cxt.addObject( "_calamares_module_basewidget", m_widget );
+
+    CALAMARES_RETRANSLATE(
+        CalamaresUtils::lookupAndCall( m_obj, { "retranslate" } );
+    )
+}
+
+
+QString
+PythonQtViewStep::prettyName() const
+{
+    return CalamaresUtils::lookupAndCall( m_obj,
+                                          { "prettyName",
+                                            "prettyname",
+                                            "pretty_name" } ).toString();
+}
+
+
+QWidget*
+PythonQtViewStep::widget()
+{
+    if ( m_widget->layout()->count() > 1 )
+        cDebug() << "WARNING: PythonQtViewStep wrapper widget has more than 1 child. "
+                    "This should never happen.";
+
+    bool nothingChanged = m_cxt.evalScript(
+        "_calamares_module.widget() in _calamares_module_basewidget.children()" ).toBool();
+    if ( nothingChanged )
+        return m_widget;
+
+    // Else, we either don't have a child widget, or we have a child widget that
+    // was previously set and doesn't apply any more since the Python module
+    // set a new one.
+
+    // First we clear the layout, which should only ever have 1 item.
+    // We only remove from the layout and not delete because Python is in charge
+    // of memory management for these widgets.
+    while ( m_widget->layout()->itemAt( 0 ) )
+        m_widget->layout()->takeAt( 0 );
+
+    m_cxt.evalScript(
+        "_calamares_module_basewidget.layout().addWidget(_calamares_module.widget())" );
+
+    return m_widget;
+}
+
+
+void
+PythonQtViewStep::next()
+{
+    CalamaresUtils::lookupAndCall( m_obj, { "next" } );
+}
+
+
+void
+PythonQtViewStep::back()
+{
+    CalamaresUtils::lookupAndCall( m_obj, { "back" } );
+}
+
+
+bool
+PythonQtViewStep::isNextEnabled() const
+{
+    return CalamaresUtils::lookupAndCall( m_obj,
+                                          { "isNextEnabled",
+                                            "isnextenabled",
+                                            "is_next_enabled" } ).toBool();
+}
+
+
+bool
+PythonQtViewStep::isBackEnabled() const
+{
+    return CalamaresUtils::lookupAndCall( m_obj,
+                                          { "isBackEnabled",
+                                            "isbackenabled",
+                                            "is_back_enabled" } ).toBool();
+}
+
+
+bool
+PythonQtViewStep::isAtBeginning() const
+{
+    return CalamaresUtils::lookupAndCall( m_obj,
+                                          { "isAtBeginning",
+                                            "isatbeginning",
+                                            "is_at_beginning" } ).toBool();
+}
+
+
+bool
+PythonQtViewStep::isAtEnd() const
+{
+    return CalamaresUtils::lookupAndCall( m_obj,
+                                          { "isAtEnd",
+                                            "isatend",
+                                            "is_at_end" } ).toBool();
+}
+
+
+QList< Calamares::job_ptr >
+PythonQtViewStep::jobs() const
+{
+    QList< Calamares::job_ptr > jobs;
+
+    PythonQtObjectPtr jobsCallable = PythonQt::self()->lookupCallable( m_obj, "jobs" );
+    if ( jobsCallable.isNull() )
+        return jobs;
+
+    PythonQtObjectPtr response = PythonQt::self()->callAndReturnPyObject( jobsCallable );
+    if ( response.isNull() )
+        return jobs;
+
+    PythonQtObjectPtr listPopCallable = PythonQt::self()->lookupCallable( response, "pop" );
+    if ( listPopCallable.isNull() )
+        return jobs;
+
+    forever
+    {
+        PythonQtObjectPtr aJob = PythonQt::self()->callAndReturnPyObject( listPopCallable, { 0 } );
+        if ( aJob.isNull() )
+            break;
+
+        jobs.append( Calamares::job_ptr( new PythonQtJob( m_cxt, aJob ) ) );
+    }
+
+    return jobs;
+}
+
+
+void
+PythonQtViewStep::setConfigurationMap( const QVariantMap& configurationMap )
+{
+    m_obj.addVariable( "configuration", configurationMap );
+}
+
+
+QWidget*
+PythonQtViewStep::createScriptingConsole()
+{
+    PythonQtScriptingConsole* console = new PythonQtScriptingConsole( nullptr, m_cxt );
+    console->setProperty( "classname",
+                          m_cxt.getVariable( "_calamares_module_typename" ).toString() );
+    return console;
+}
+
+}

src/libcalamaresui/viewpages/PythonQtViewStep.h

@@ -0,0 +1,65 @@
+/* === 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 PYTHONQTVIEWSTEP_H
+#define PYTHONQTVIEWSTEP_H
+
+#include "ViewStep.h"
+
+#include <PythonQt.h>
+
+namespace Calamares
+{
+
+class PythonQtViewStep : public Calamares::ViewStep
+{
+    Q_OBJECT
+public:
+    PythonQtViewStep( PythonQtObjectPtr cxt,
+                      QObject* parent = nullptr );
+
+    QString prettyName() const override;
+
+    QWidget* widget() override;
+
+    void next() override;
+    void back() override;
+
+    bool isNextEnabled() const override;
+    bool isBackEnabled() const override;
+
+    bool isAtBeginning() const override;
+    bool isAtEnd() const override;
+
+    QList< Calamares::job_ptr > jobs() const override;
+
+    void setConfigurationMap( const QVariantMap& configurationMap ) override;
+
+    QWidget* createScriptingConsole();
+
+protected:
+    QWidget* m_widget;
+
+private:
+    PythonQtObjectPtr m_cxt;
+    PythonQtObjectPtr m_obj;
+};
+
+}
+
+#endif // PYTHONQTVIEWSTEP_H

src/modules/dummypythonqt/dummypythonqt.conf

@@ -0,0 +1,18 @@
+---
+syntax: "YAML map of anything"
+example:
+    whats_this: "module-specific configuration"
+    from_where: "dummypythonqt.conf"
+a_list:
+    - "item1"
+    - "item2"
+    - "item3"
+    - "item4"
+a_list_of_maps:
+    - name: "an Item"
+      contents:
+        - "an element"
+        - "another element"
+    - name: "another item"
+      contents:
+        - "not much"

src/modules/dummypythonqt/main.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# === 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/>.
+
+import platform
+
+from PythonQt.QtGui import *
+import PythonQt.calamares as calamares
+
+# Set up translations.
+# You may skip this if your Calamares module has no user visible strings.
+# DO NOT install _ into the builtin namespace because each module loads
+# its own catalog.
+# DO use the gettext class-based API and manually alias _ as described in:
+# https://docs.python.org/3.5/library/gettext.html#localizing-your-module
+import gettext
+import inspect
+import os
+filename = inspect.getframeinfo(inspect.currentframe()).filename
+path = os.path.dirname(os.path.abspath(filename))
+# t = gettext.translation('dummypythonqt',
+#                         os.path.join(path, 'lang'),
+#                         languages=['en'])
+#_ = t.lgettext
+_ = gettext.gettext
+
+# Example Python ViewModule.
+# A Python ViewModule is a Python program which defines a ViewStep class.
+# This class must be marked with the @calamares_module decorator. A
+# ViewModule may define other classes, but only one may be decorated with
+# @calamares_module. Such a class must conform to the Calamares ViewStep
+# interface and functions as the entry point of the module.
+# A ViewStep manages one or more "wizard pages" through methods like
+# back/next, and reports its status through isNextEnabled/isBackEnabled/
+# isAtBeginning/isAtEnd. The whole UI, including all the pages, must be
+# exposed as a single QWidget, returned by the widget function.
+@calamares_module
+class DummyPythonQtViewStep():
+    def __init__(self):
+        self.main_widget = QFrame()
+
+        self.main_widget.setLayout(QVBoxLayout())
+
+        label = QLabel()
+        self.main_widget.layout().addWidget(label)
+
+        accumulator = "\nCalamares+PythonQt running embedded Python " +\
+                      platform.python_version()
+        label.text = accumulator
+
+        btn = QPushButton()
+        btn.setText(_("Click me!"))
+        self.main_widget.layout().addWidget(btn)
+        btn.connect("clicked(bool)", self.on_btn_clicked)
+
+    def on_btn_clicked(self):
+        self.main_widget.layout().addWidget(QLabel("A new QLabel."))
+
+    def prettyName(self):
+        return "Dummy PythonQt ViewStep"
+
+    def isNextEnabled(self):
+        return True
+
+    def isBackEnabled(self):
+        return True
+
+    def isAtBeginning(self):
+        return True
+
+    def isAtEnd(self):
+        return True
+
+    def jobs(self):
+        return [DummyPQJob("hi there lol")]
+
+    def widget(self):
+        return self.main_widget
+
+
+class DummyPQJob():
+    def __init__(self, my_msg):
+        self.my_msg = my_msg
+
+    def pretty_name(self):
+        return _("The Dummy PythonQt Job")
+
+    def pretty_description(self):
+        return _("This description says that the Dummy PythonQt Job is a dummy. "
+                 "The dummy job says: {}".format(self.my_msg))
+
+    def pretty_status_message(self):
+        return _("A status message for DPQ Job.")
+
+    def exec(self):
+        rmp = calamares.global_storage['rootMountPoint']
+        os.system("touch {}/calamares_dpqt_was_here".format(rmp))
+        calamares.utils.debug("the dummy job says {}".format(self.my_msg))
+        return {'ok': True}

src/modules/dummypythonqt/module.desc

@@ -0,0 +1,7 @@
+# Module metadata file for dummy pythonqt jobmodule
+# Syntax is YAML 1.2
+---
+type:       "view"
+name:       "dummypythonqt"
+interface:  "pythonqt"
+script:     "main.py"   #assumed relative to the current directory