Improve Python generator

The Python generator generates the .qrc resources file,
pyproject.toml, main.py and a settings.py files.
This way, pyside6-project can run the code without doing any change in
the QML code.

Change-Id: Iddcc0c7f7a48c581f656f6d156b17460d4106691
Reviewed-by: Knud Dollereder <knud.dollereder@qt.io>

src/plugins/qmlprojectmanager/qmlprojectexporter/boilerplate.qrc

@@ -11,5 +11,8 @@
         <file alias="import_qml_components_h">templates/import_qml_components_h.tpl</file>
         <file alias="qtquickcontrols_conf">templates/qtquickcontrols2_conf.tpl</file>
         <file alias="cmake_shared">templates/cmakelists_txt_shared.tpl</file>
+        <file alias="python_generator_main">templates/python_generator_main.tpl</file>
+        <file alias="python_generator_settings">templates/python_generator_settings.tpl</file>
+        <file alias="python_pyproject_toml">templates/python_pyproject_toml.tpl</file>
     </qresource>
 </RCC>

src/plugins/qmlprojectmanager/qmlprojectexporter/exporter.cpp

@@ -30,6 +30,7 @@ void Exporter::updateProject(QmlProject *project)
 void Exporter::updateProjectItem(QmlProjectItem *item, bool updateEnabled)
 {
     connect(item, &QmlProjectItem::filesChanged, m_cmakeGen, &CMakeGenerator::update);
+    connect(item, &QmlProjectItem::filesChanged, m_pythonGen, &PythonGenerator::update);
     connect(item, &QmlProjectItem::fileModified, m_cmakeGen, &CMakeGenerator::updateModifiedFile);
 
     if (updateEnabled) {

src/plugins/qmlprojectmanager/qmlprojectexporter/pythongenerator.cpp

@@ -3,41 +3,14 @@
 
 #include "pythongenerator.h"
 #include "cmakewriter.h"
+#include "resourcegenerator.h"
 
 #include "projectexplorer/projectmanager.h"
 #include "qmlprojectmanager/qmlproject.h"
 
 #include <QMenu>
 
-namespace QmlProjectManager {
-
-namespace QmlProjectExporter {
-
-const char *PYTHON_MAIN_FILE_TEMPLATE = R"(
-import os
-import sys
-from pathlib import Path
-
-from PySide6.QtGui import QGuiApplication
-from PySide6.QtQml import QQmlApplicationEngine
-
-from autogen.settings import url, import_paths
-
-if __name__ == '__main__':
-    app = QGuiApplication(sys.argv)
-    engine = QQmlApplicationEngine()
-
-    app_dir = Path(__file__).parent.parent
-
-    engine.addImportPath(os.fspath(app_dir))
-    for path in import_paths:
-        engine.addImportPath(os.fspath(app_dir / path))
-
-    engine.load(os.fspath(app_dir/url))
-    if not engine.rootObjects():
-        sys.exit(-1)
-    sys.exit(app.exec())
-)";
+namespace QmlProjectManager::QmlProjectExporter {
 
 void PythonGenerator::createMenuAction(QObject *parent)
 {
@@ -66,9 +39,8 @@ PythonGenerator::PythonGenerator(QmlBuildSystem *bs)
 
 void PythonGenerator::updateMenuAction()
 {
-    FileGenerator::updateMenuAction(
-        "QmlProject.EnablePythonGenerator",
-        [this]() { return buildSystem()->enablePythonGeneration(); });
+    FileGenerator::updateMenuAction("QmlProject.EnablePythonGenerator",
+                                    [this]() { return buildSystem()->enablePythonGeneration(); });
 }
 
 void PythonGenerator::updateProject(QmlProject *project)
@@ -77,38 +49,47 @@ void PythonGenerator::updateProject(QmlProject *project)
         return;
 
     Utils::FilePath projectPath = project->rootProjectDirectory();
-    Utils::FilePath pythonPath = projectPath.pathAppended("Python");
-    if (!pythonPath.exists())
-        pythonPath.createDir();
+    Utils::FilePath pythonFolderPath = projectPath.pathAppended("Python");
+    if (!pythonFolderPath.exists())
+        pythonFolderPath.createDir();
 
-    Utils::FilePath mainFile = pythonPath.pathAppended("main.py");
-    if (!mainFile.exists()) {
-        const QString mainContent = QString::fromUtf8(PYTHON_MAIN_FILE_TEMPLATE);
-        CMakeWriter::writeFile(mainFile, mainContent);
+    Utils::FilePath mainFilePath = pythonFolderPath.pathAppended("main.py");
+    if (!mainFilePath.exists()) {
+        const QString mainFileTemplate = CMakeWriter::readTemplate(
+            ":/templates/python_generator_main");
+        CMakeWriter::writeFile(mainFilePath, mainFileTemplate);
     }
 
-    Utils::FilePath autogenPath = pythonPath.pathAppended("autogen");
-    if (!autogenPath.exists())
-        autogenPath.createDir();
+    Utils::FilePath pyprojectFilePath = pythonFolderPath.pathAppended("pyproject.toml");
+    if (!pyprojectFilePath.exists()) {
+        const QString pyprojectFileTemplate = CMakeWriter::readTemplate(
+            ":/templates/python_pyproject_toml");
+        const QString pyprojectFileContent = pyprojectFileTemplate.arg(project->displayName());
+        CMakeWriter::writeFile(pyprojectFilePath, pyprojectFileContent);
+    }
 
-    Utils::FilePath settingsPath = autogenPath.pathAppended("settings.py");
-    CMakeWriter::writeFile(settingsPath, settingsFileContent());
+    Utils::FilePath autogenFolderPath = pythonFolderPath.pathAppended("autogen");
+    if (!autogenFolderPath.exists())
+        autogenFolderPath.createDir();
+
+    Utils::FilePath settingsFilePath = autogenFolderPath.pathAppended("settings.py");
+    const QString settingsFileTemplate = CMakeWriter::readTemplate(
+        ":/templates/python_generator_settings");
+    const QString settingsFileContent = settingsFileTemplate.arg(buildSystem()->mainFile());
+    CMakeWriter::writeFile(settingsFilePath, settingsFileContent);
+
+    // Python code uses the Qt resources collection file (.qrc)
+    ResourceGenerator::createQrc(project);
 }
 
-QString PythonGenerator::settingsFileContent() const
-{
-    QTC_ASSERT(buildSystem(), return {});
+/*!
+    Regenerates the .qrc resources file
+*/
+void PythonGenerator::update(const QSet<QString> &added, const QSet<QString> &removed) {
+    Q_UNUSED(added);
+    Q_UNUSED(removed);
+    ResourceGenerator::createQrc(qmlProject());
+    // Generated Python code does not need to be updated
+};
 
-    QString content("\n");
-    content.append("url = \"" + buildSystem()->mainFile() + "\"\n");
-
-    content.append("import_paths = [\n");
-    for (const QString &path : buildSystem()->importPaths())
-        content.append("\t\"" + path + "\",\n");
-    content.append("]\n");
-
-    return content;
-}
-
-} // namespace QmlProjectExporter.
-} // namespace QmlProjectManager.
+} // namespace QmlProjectExporter::QmlProjectManager.

src/plugins/qmlprojectmanager/qmlprojectexporter/pythongenerator.h

@@ -21,11 +21,10 @@ public:
     static void createMenuAction(QObject *parent);
 
     PythonGenerator(QmlBuildSystem *bs);
+
+    void update(const QSet<QString> &added, const QSet<QString> &removed);
     void updateMenuAction() override;
     void updateProject(QmlProject *project) override;
-
-private:
-    QString settingsFileContent() const;
 };
 
 } // namespace QmlProjectExporter.

src/plugins/qmlprojectmanager/qmlprojectexporter/templates/python_generator_main.tpl

@@ -0,0 +1,26 @@
+import sys
+
+from PySide6.QtGui import QGuiApplication
+from PySide6.QtQml import QQmlApplicationEngine
+
+from autogen.settings import setup_qt_environment
+
+# Import here the Python files that define QML elements
+
+
+def main():
+    app = QGuiApplication(sys.argv)
+    engine = QQmlApplicationEngine()
+
+    setup_qt_environment(engine)
+
+    if not engine.rootObjects():
+        sys.exit(-1)
+
+    ex = app.exec()
+    del engine
+    return ex
+
+
+if __name__ == "__main__":
+    sys.exit(main())

src/plugins/qmlprojectmanager/qmlprojectexporter/templates/python_generator_settings.tpl

@@ -0,0 +1,36 @@
+# This file is automatically generated by Qt Design Studio.
+import os
+import sys
+from pathlib import Path
+
+from PySide6.QtQml import QQmlApplicationEngine
+
+project_root = Path(__file__).parent.parent.parent
+
+
+def setup_qt_environment(qml_engine: QQmlApplicationEngine):
+    """
+    Load the QML application. Import the compiled resources when the application is deployed.
+    """
+    qml_app_url = "%1"
+
+    if "__compiled__" in globals():
+        # Application has been deployed using pyside6-deploy
+        try:
+            import autogen.resources  # noqa: F401
+        except ImportError:
+            resource_file = Path(__file__).parent / "resources.py"
+            print(
+                f"Error: No compiled resources found in {resource_file.absolute()}\n"
+                f"Please compile the resources using pyside6-rcc or pyside6-project build",
+                file=sys.stderr,
+            )
+            sys.exit(1)
+
+        qml_engine.addImportPath(":/")
+        qml_engine.load(f":/{qml_app_url}")
+        return
+
+    qml_engine.addImportPath(str(project_root.absolute()))
+    os.environ["QT_QUICK_CONTROLS_CONF"] = str(project_root / "qtquickcontrols2.conf")
+    qml_engine.load(str(project_root / qml_app_url))

src/plugins/qmlprojectmanager/qmlprojectexporter/templates/python_pyproject_toml.tpl

@@ -0,0 +1,5 @@
+[project]
+name = "%1"
+
+[tool.pyside6-project]
+files = ["main.py", "autogen/settings.py"]