base for the Atlas JavaScript engine : implemented the Engine, a virtual filesytem and prepared the library system.

.gitignore

@@ -1,196 +1,7 @@
-# ---> Python
-# Byte-compiled / optimized / DLL files
-__pycache__/
-*.py[cod]
-*$py.class
+# IDE
+.idea/
+.venv/
 
-# C extensions
-*.so
-
-# Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-share/python-wheels/
-*.egg-info/
-.installed.cfg
-*.egg
-MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
-# Installer logs
-pip-log.txt
-pip-delete-this-directory.txt
-
-# Unit test / coverage reports
-htmlcov/
-.tox/
-.nox/
-.coverage
-.coverage.*
-.cache
-nosetests.xml
-coverage.xml
-*.cover
-*.py,cover
-.hypothesis/
-.pytest_cache/
-cover/
-
-# Translations
-*.mo
-*.pot
-
-# Django stuff:
-*.log
-local_settings.py
-db.sqlite3
-db.sqlite3-journal
-
-# Flask stuff:
-instance/
-.webassets-cache
-
-# Scrapy stuff:
-.scrapy
-
-# Sphinx documentation
-docs/_build/
-
-# PyBuilder
-.pybuilder/
-target/
-
-# Jupyter Notebook
-.ipynb_checkpoints
-
-# IPython
-profile_default/
-ipython_config.py
-
-# pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
-# .python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
-
-# pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/#use-with-ide
-.pdm.toml
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
-__pypackages__/
-
-# Celery stuff
-celerybeat-schedule
-celerybeat.pid
-
-# SageMath parsed files
-*.sage.py
-
-# Environments
-.env
-.venv
-env/
-venv/
-ENV/
-env.bak/
-venv.bak/
-
-# Spyder project settings
-.spyderproject
-.spyproject
-
-# Rope project settings
-.ropeproject
-
-# mkdocs documentation
-/site
-
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
-
-# Pyre type checker
-.pyre/
-
-# pytype static type analyzer
-.pytype/
-
-# Cython debug symbols
-cython_debug/
-
-# PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
-
-# ---> C++
-# Prerequisites
-*.d
-
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-*.smod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
+# CMake
+cmake-*/
 

.gitmodules

@@ -1,9 +1,9 @@
 [submodule ".mods/Atlas"]
 	path = .mods/Atlas
 	url = https://git.faraphel.fr/Atlas/Atlas-Mod
-[submodule "library-szs"]
+[submodule "external/szs"]
 	path = external/szs
 	url = https://git.faraphel.fr/Atlas/library-szs
-[submodule "library-wit"]
-	path = external/szs
+[submodule "external/wit"]
+	path = external/wit
 	url = https://git.faraphel.fr/Atlas/library-wit

.mods/Atlas

@@ -0,0 +1 @@
+Subproject commit 997d361d05a2f022d027118f6d1cb5c9642586a5

CMakeLists.txt

@@ -0,0 +1,50 @@
+cmake_minimum_required(VERSION 3.28)
+project(Atlas-Launcher LANGUAGES CXX)
+
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+
+find_package(Qt6 REQUIRED COMPONENTS
+        Core
+        Gui
+        Widgets
+        Qml
+)
+add_executable(Atlas-Launcher
+        source/main.cpp
+        source/javascript/module/AtlasJsModule.cpp
+        source/javascript/module/AtlasJsModule.hpp
+        source/javascript/engine/AtlasJsEngine.cpp
+        source/javascript/engine/AtlasJsEngine.hpp
+        source/javascript/module/debug/DebugJsModule.cpp
+        source/javascript/module/debug/DebugJsModule.hpp
+        source/javascript/module/image/ImageJsModule.cpp
+        source/javascript/module/image/ImageJsModule.hpp
+        source/javascript/module/image/ImageJsObject.cpp
+        source/javascript/module/image/ImageJsObject.hpp
+        source/javascript/module/_base/BaseJsModule.cpp
+        source/javascript/module/_base/BaseJsModule.hpp
+        source/javascript/module/file/FileJsModule.cpp
+        source/javascript/module/file/FileJsModule.hpp
+)
+target_link_libraries(Atlas-Launcher PRIVATE
+        # Tools
+        RVFS
+        SZS
+
+        # Qt Framework
+        Qt::Core
+        Qt::Gui
+        Qt::Widgets
+        Qt::Qml
+)
+
+
+add_subdirectory(external/rvfs)
+add_subdirectory(external/szs)

external/rvfs/CMakeLists.txt

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.28)
+project(RVFS LANGUAGES CXX)
+
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+
+find_package(Qt6 REQUIRED COMPONENTS
+        Core
+)
+add_library(RVFS STATIC
+        source/RestrictedVirtualFileSystem.cpp
+)
+target_include_directories(RVFS PUBLIC
+        include/
+)
+target_link_libraries(RVFS PRIVATE
+        # Qt Framework
+        Qt::Core
+)
+
+add_subdirectory(tests)

external/rvfs/README.md

@@ -0,0 +1,10 @@
+# Restricted Virtual File System
+This is a micro-library used to create a virtual file system to restrict access 
+to the host file system while still being able to mount directories that can be accessed.
+
+As of right now, this is an incredibly simple implementation of this system that
+work by mapping virtual directory path to a corresponding real directory path, replacing
+them while resolving the path and reject all others paths that have not been mounted
+to avoid access to other files.  
+
+It does not emulate a real file system nor allow control over permissions of the files.

external/rvfs/include/RestrictedVirtualFileSystem.hpp

@@ -0,0 +1,62 @@
+#pragma once
+#include <QDir>
+#include <QMap>
+
+
+namespace rvfs {
+
+/**
+ * Represent a virtual restricted file system.
+ * Real directory can be mounted to safely interact with the real file system.
+ */
+class RestrictedVirtualFileSystem {
+
+public:
+    explicit RestrictedVirtualFileSystem();
+
+    /**
+     * Get all the mounted directories with their path in the virtual file system and in the real file system
+     * @return all the mounted directories with their path in the virtual file system and in the real file system
+     */
+    QMap<QString, QString> getMountedDirectories();
+
+    /**
+     * Mount a real directory into the virtual file system
+     * @param destination the path to the directory in the virtual file system
+     * @param source the path to the directory in the real file system
+     */
+    void mountDirectory(const QDir& destination, const QDir& source);
+
+    /**
+     * Unmount a directory from the virtual file system
+     * @param destination the path to the directory in the virtual file system
+     */
+    void unmountDirectory(const QDir& destination);
+
+    /**
+     * Get the current working directory in the virtual file system
+     * @return the current working directory in the virtual file system
+     */
+    QDir getWorkingDirectory();
+    /**
+     * Change the current working directory in the virtual file system
+     * @param path path to the new virtual working directory
+     */
+    void setWorkingDirectory(const QDir& path);
+
+    /**
+     * Resolve a path inside the virtual file system into a path in the real file system
+     * @param path the path in the virtual file system
+     * @return the matching path in the real file system
+     */
+    QString resolvePath(QString path);
+
+private:
+    /// the current working directory
+    QDir workingDirectory;
+    /// store the path in the virtual file system of a directory in the real file system
+    QMap<QString, QString> mounts;
+
+};
+
+}

external/rvfs/source/RestrictedVirtualFileSystem.cpp

@@ -0,0 +1,65 @@
+#include "RestrictedVirtualFileSystem.hpp"
+
+
+namespace rvfs {
+
+RestrictedVirtualFileSystem::RestrictedVirtualFileSystem() = default;
+
+QMap<QString, QString> RestrictedVirtualFileSystem::getMountedDirectories() {
+    return this->mounts;
+}
+
+void RestrictedVirtualFileSystem::mountDirectory(const QDir& destination, const QDir& source) {
+    // check if the source directory does exists
+    if (!source.exists())
+        // TODO(Faraphel): should be a custom error ?
+        throw std::runtime_error("The source directory does not exists.");
+
+    // mount it by associating our virtual folder with our real one
+    this->mounts[destination.absolutePath()] = source.absolutePath();
+}
+
+void RestrictedVirtualFileSystem::unmountDirectory(const QDir& destination) {
+    // remove the mounted directory from the map
+    this->mounts.remove(destination.absolutePath());
+}
+
+QDir RestrictedVirtualFileSystem::getWorkingDirectory() {
+    return this->workingDirectory;
+}
+
+void RestrictedVirtualFileSystem::setWorkingDirectory(const QDir& path) {
+    this->workingDirectory = path;
+}
+
+QString RestrictedVirtualFileSystem::resolvePath(QString path) {
+    if (QFileInfo(path).isRelative()) {
+        // if the path is relative, make it absolute with the current working directory
+        path = this->workingDirectory.absoluteFilePath(path);
+    } else {
+        // if the path is absolute, make sure to resolve the special syntax like ".."
+        path = QFileInfo(path).absoluteFilePath();
+    }
+
+    bool resolved = false;
+    // go through all the mounted directories
+    for (auto const& [destination, source] : this->mounts.asKeyValueRange()) {
+        // if the path is inside a mounted directory
+        if (path.startsWith(destination)) {
+            // replace the mounted directory by the original real one
+            path = path.replace(0, destination.length(), source);
+            // mark the path as resolved and break
+            resolved = true;
+            break;
+        }
+    }
+
+    // if the path has not been resolved, it is in an invalid or forbidden location
+    if (!resolved)
+        // TODO(Faraphel): should be a custom error ?
+        throw std::runtime_error("cannot resolve path: invalid.");
+
+    return path;
+}
+
+}

external/rvfs/tests/CMakeLists.txt

@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.28)
+project(Test-RVFS LANGUAGES CXX)
+
+
+enable_testing()
+
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+
+# Packages
+find_package(Qt6 REQUIRED COMPONENTS
+        Core
+)
+
+# Test executable
+add_executable(Test-RVFS
+        test-restriction.cpp
+)
+# Libraries
+target_link_libraries(Test-RVFS PRIVATE
+        # Code to test
+        RVFS
+        # Qt Framework
+        Qt::Core
+)
+# Copy the assets to run the tests
+file(COPY _assets DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+
+# Test
+add_test(NAME Test-RVFS COMMAND Test-RVFS)

external/rvfs/tests/_assets/content.txt

@@ -0,0 +1 @@
+This is a simple text file.

external/rvfs/tests/test-restriction.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <RestrictedVirtualFileSystem.hpp>
+
+int main() {
+    // TODO(Faraphel): use a real unit test framework ?
+
+    // create a basic rvfs
+    rvfs::RestrictedVirtualFileSystem fs;
+
+    // mount a directory into our system
+    fs.mountDirectory(QDir("/assets/"), QDir("./_assets/"));
+
+    // TEST: check if a file outside of an allowed mounted directory can't be resolved
+    try {
+        const QString& path = fs.resolvePath("/content.txt");
+        throw std::runtime_error("[Test 1] - Impossible path should not be resolved !");
+    } catch (const std::runtime_error& exception) {}
+
+    // TEST: check if a file in a mounted directory can be resolved
+    try {
+        const QString& path = fs.resolvePath("/assets/content.txt");
+
+        auto file = QFile(path);
+        file.open(QIODeviceBase::Text | QIODevice::ReadOnly);
+        std::cout << file.readAll().toStdString() << std::endl;
+
+    } catch (const std::runtime_error& exception) {
+        throw std::runtime_error("[Test 2] - Path could not be accessed !");
+    }
+
+    // TEST: cannot bypass security with the ".." parent directory syntax
+    try {
+        const QString& path = fs.resolvePath("/assets/../content.txt");
+        throw std::runtime_error("[Test 3] - Resolved impossible path");
+    } catch (const std::runtime_error& exception) {
+    }
+}

external/szs

@@ -0,0 +1 @@
+Subproject commit 3b292fbcad336ebb2d9137a379c8a9cdaf945162

external/wit

@@ -0,0 +1 @@
+Subproject commit 80328498a1f2446a67a1df55900edb63e6e93bb0

source/javascript/engine/AtlasJsEngine.cpp

@@ -0,0 +1,20 @@
+#include "AtlasJsEngine.hpp"
+
+#include "../module/AtlasJsModule.hpp"
+
+
+namespace atlas::js {
+
+
+AtlasJsEngine::AtlasJsEngine(QObject *parent) : QJSEngine(parent) {
+    // instanciate a new Atlas module
+    this->moduleAtlas = std::make_unique<AtlasJsModule>(this);
+
+    // convert it into a javascript object
+    const QJSValue jsModuleAtlas = this->newQObject(this->moduleAtlas.get());
+    // make it accessible as "atlas" in the javascript code
+    this->globalObject().setProperty("atlas", jsModuleAtlas);
+}
+
+
+}

source/javascript/engine/AtlasJsEngine.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <QJSEngine>
+#include <QList>
+#include <QDir>
+
+#include "../module/AtlasJsModule.hpp"
+
+
+namespace atlas::js {
+
+/**
+ * This class represent a Qt JavaScript engine modified to support the Atlas framework.
+ */
+class AtlasJsEngine : public QJSEngine {
+
+public:
+    explicit AtlasJsEngine(QObject* parent);
+
+private:
+    std::shared_ptr<AtlasJsModule> moduleAtlas;
+};
+
+}

source/javascript/module/AtlasJsModule.cpp

@@ -0,0 +1,47 @@
+#include "AtlasJsModule.hpp"
+
+#include <QJSEngine>
+
+#include "debug/DebugJsModule.hpp"
+#include "image/ImageJsModule.hpp"
+
+
+AtlasJsModule::AtlasJsModule(QJSEngine* engine, QObject* parent) : QObject(parent) {
+    // set the engine
+    this->engine = engine;
+
+    // load the submodules
+    this->submodules[QStringLiteral("debug")] = std::make_shared<DebugJsModule>(this->engine);
+    this->submodules[QStringLiteral("image")] = std::make_shared<ImageJsModule>(this->engine);
+}
+
+QJSValue AtlasJsModule::require(const QString& name) {
+    std::shared_ptr<BaseJsModule> submodule;
+
+    try {
+        // get the submodule from its name
+        submodule = this->submodules.at(name);
+    } catch (const std::out_of_range&) {
+        // if not found, throw a Javascript error and return null
+        this->engine->throwError(
+            QJSValue::ReferenceError,
+            QStringLiteral("the module \"") + name + QStringLiteral("\" does not exist.")
+        );
+        return QJSValue(QJSPrimitiveNull());
+    }
+
+    // return the module as a new javascript object
+    return this->engine->newQObject(submodule.get());
+}
+
+QJSValueList AtlasJsModule::getVersion() {
+    // TODO(Faraphel): should be stored somewhere else.
+    // TODO(Faraphel): The type should implement an easy comparison system, if possible
+    QJSValueList version;
+
+    version.append(1);
+    version.append(0);
+    version.append(0);
+
+    return version;
+}

source/javascript/module/AtlasJsModule.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+
+#include <QObject>
+#include <QJSValue>
+
+#include "_base/BaseJsModule.hpp"
+
+
+class AtlasJsModule : public QObject {
+    Q_OBJECT
+
+public:
+    explicit AtlasJsModule(QJSEngine* engine, QObject* parent = nullptr);
+
+    /**
+     * Import an Atlas submodule
+     * @param name the name of the module to import
+     * @return the module
+     */
+    Q_INVOKABLE QJSValue require(const QString& name);
+
+    /**
+     * Get the version of the Atlas Javascript engine
+     * @return the Atlas version
+     */
+    Q_INVOKABLE static QJSValueList getVersion();
+
+private:
+    /// the parent JavaScript engine
+    QJSEngine* engine;
+    /// the submodules contained in this module
+    std::map<QString, std::shared_ptr<BaseJsModule>> submodules;
+};

source/javascript/module/_base/BaseJsModule.cpp

@@ -0,0 +1,6 @@
+#include "BaseJsModule.hpp"
+
+
+BaseJsModule::BaseJsModule(QJSEngine *engine) {
+    this->engine = engine;
+}

source/javascript/module/_base/BaseJsModule.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QObject>
+#include <QJSEngine>
+
+
+/**
+ * Base class for an Atlas JavaScript submodule
+ */
+class BaseJsModule : public QObject {
+    Q_OBJECT
+
+public:
+    explicit BaseJsModule(QJSEngine* engine);
+
+protected:
+    /// The javascript engine running the module
+    QJSEngine* engine;
+};

source/javascript/module/debug/DebugJsModule.cpp

@@ -0,0 +1,10 @@
+#include "DebugJsModule.hpp"
+
+#include <QDebug>
+
+
+DebugJsModule::DebugJsModule(QJSEngine* engine) : BaseJsModule(engine) {}
+
+void DebugJsModule::information(const QString& text) {
+    qDebug() << text;
+}

source/javascript/module/debug/DebugJsModule.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "../_base/BaseJsModule.hpp"
+
+
+/**
+ * This module implements useful feature to help with debugging
+ */
+class DebugJsModule : public BaseJsModule {
+    Q_OBJECT
+
+public:
+    explicit DebugJsModule(QJSEngine* engine);
+
+    /**
+     * Print an informational message
+     */
+    Q_INVOKABLE static void information(const QString& text);
+};

source/javascript/module/file/FileJsModule.cpp

@@ -0,0 +1,12 @@
+#include "FileJsModule.hpp"
+
+#include <QFile>
+
+
+FileJsModule::FileJsModule(QJSEngine *engine, const QList<QDir>& allowedDirectories) : BaseJsModule(engine) {
+    this->allowedDirectories = allowedDirectories;
+}
+
+QJSValue FileJsModule::open(const QString& path) {
+    QFile file(path);
+}

source/javascript/module/file/FileJsModule.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <QDir>
+
+#include "../_base/BaseJsModule.hpp"
+
+
+class FileJsModule : public BaseJsModule {
+    Q_OBJECT
+
+public:
+    explicit FileJsModule(QJSEngine* engine, const QList<QDir>& allowedDirectories);
+
+    Q_INVOKABLE QJSValue open(const QString& path);
+
+private:
+    QList<QDir> allowedDirectories;
+};

source/javascript/module/image/ImageJsModule.cpp

@@ -0,0 +1,11 @@
+#include "ImageJsModule.hpp"
+
+#include "ImageJsObject.hpp"
+
+
+ImageJsModule::ImageJsModule(QJSEngine* engine) : BaseJsModule(engine) {}
+
+QJSValue ImageJsModule::load(const QString& path) {
+    // TODO(Faraphel): can the new lead to a memory leak ?
+    return this->engine->newQObject(new ImageJsObject(path));
+}

source/javascript/module/image/ImageJsModule.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <QJSValue>
+
+#include "ImageJsObject.hpp"
+#include "../_base/BaseJsModule.hpp"
+
+
+/**
+ * A module to manipulate image file
+ */
+class ImageJsModule : public BaseJsModule {
+    Q_OBJECT
+
+public:
+    explicit ImageJsModule(QJSEngine* engine);
+
+    /**
+     * Load an image file
+     * @param
+     */
+    Q_INVOKABLE QJSValue load(const QString& path);
+};

source/javascript/module/image/ImageJsObject.cpp

@@ -0,0 +1,20 @@
+#include "ImageJsObject.hpp"
+
+#include <QImage>
+
+
+ImageJsObject::ImageJsObject(const QString& path) {
+    this->_internal = std::make_unique<QImage>(path);
+}
+
+std::size_t ImageJsObject::getWidth() {
+    return this->_internal->width();
+}
+
+std::size_t ImageJsObject::getHeight() {
+    return this->_internal->height();
+}
+
+QSize ImageJsObject::getSize() {
+    return this->_internal->size();
+}

source/javascript/module/image/ImageJsObject.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <QObject>
+#include <QImage>
+
+
+class ImageJsObject : public QObject {
+    Q_OBJECT
+
+public:
+    explicit ImageJsObject(const QString& path);
+
+    Q_INVOKABLE std::size_t getWidth();
+    Q_INVOKABLE std::size_t getHeight();
+    Q_INVOKABLE QSize getSize();
+
+    // TODO(Faraphel): implement copy / paste, fill, shapes, mirror, resize, expand, shrink, crop, map...
+
+private:
+    std::unique_ptr<QImage> _internal;
+};
+

source/main.cpp

@@ -0,0 +1,71 @@
+#include <iostream>
+
+#include "javascript/engine/AtlasJsEngine.hpp"
+
+#include <QApplication>
+#include <QMainWindow>
+#include <QTextEdit>
+#include <QPushButton>
+#include <QLayout>
+#include <QVBoxLayout>
+#include <QDir>
+#include <QString>
+#include <QTemporaryDir>
+
+#include <RestrictedVirtualFileSystem.hpp>
+
+
+int main(int argc, char* argv[]) {
+    // application informations
+    QApplication application(argc, argv);
+    QApplication::setOrganizationDomain("faraphel.fr");
+    QApplication::setApplicationName("Atlas-Launcher");
+    QApplication::setApplicationVersion("1.0.0");
+
+    // create a restricted virtual file system
+    const auto fileSystem = std::make_shared<rvfs::RestrictedVirtualFileSystem>();
+
+    // mount the cache directory
+    fileSystem->mountDirectory(
+        QDir("/cache/"),
+        QDir("/home/faraphel/Documents/Projects/Atlas-Launcher/source/")
+    );
+
+    // mount the temporary directory
+    const auto temporaryDir = QTemporaryDir();
+    fileSystem->mountDirectory(
+        QDir("/tmp/"),
+        QDir(temporaryDir.path())
+    );
+
+    // create a small window
+    auto mainWindow = std::make_shared<QMainWindow>();
+
+    auto widget = std::make_shared<QWidget>();
+    mainWindow->setCentralWidget(widget.get());
+
+    auto layout = std::make_shared<QVBoxLayout>();
+    widget->setLayout(layout.get());
+
+    auto input = std::make_shared<QTextEdit>();
+    layout->addWidget(input.get());
+
+    auto submit = std::make_shared<QPushButton>();
+    layout->addWidget(submit.get());
+    submit->setText("Run");
+
+    auto output = std::make_shared<QTextEdit>();
+    layout->addWidget(output.get());
+    output->setEnabled(false);
+
+    QObject::connect(submit.get(), &QPushButton::clicked, [&]() {
+       auto engine = std::make_shared<atlas::js::AtlasJsEngine>(nullptr);
+
+       QJSValue value = engine->evaluate(input->toPlainText());
+       output->setText(value.toString());
+    });
+
+    mainWindow->show();
+
+    return QApplication::exec();
+}