Add basic code

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+project(leek)
+
+find_package(ECM 6.0.0 REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS TRUE)
+
+include(KDEInstallDirs)
+include(KDECMakeSettings)
+include(KDECompilerSettings NO_POLICY_SCOPE)
+include(ECMFindQmlModule)
+include(ECMQmlModule)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Quick Gui QuickControls2 Widgets)
+
+find_package(KF6 REQUIRED COMPONENTS Kirigami I18n CoreAddons QQC2DesktopStyle
+                                     IconThemes)
+
+# Don't mark this as required, since qml module finding is broken on NixOS
+ecm_find_qmlmodule(org.kde.kirigami)
+
+add_subdirectory(src)
+
+install(PROGRAMS xyz.toast003.leek.desktop DESTINATION ${KDE_INSTALL_APPDIR})
+
+feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES
+                         FATAL_ON_MISSING_REQUIRED_PACKAGES)

src/CMakeLists.txt

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+add_executable(leek)
+
+ecm_add_qml_module(leek URI xyz.toast003.leek)
+
+target_sources(leek PRIVATE main.cpp)
+
+ecm_target_qml_sources(leek SOURCES Main.qml)
+
+target_link_libraries(leek PRIVATE Qt6::Quick Qt6::Qml Qt6::Gui
+                                   Qt6::QuickControls2 Qt6::Widgets)
+target_link_libraries(leek PRIVATE KF6::I18n KF6::CoreAddons KF6::IconThemes)
+
+install(TARGETS leek ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})

src/Main.qml

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+import QtQuick
+import QtQuick.Layouts
+import QtQuick.Controls as Controls
+import org.kde.kirigami as Kirigami
+
+Kirigami.ApplicationWindow {
+    id: root
+    title: "Leek"
+
+    pageStack.initialPage: Kirigami.Page {
+        Controls.Label {
+            anchors.centerIn: parent
+            text: "Hello world"
+        }
+    }
+}
+

src/main.cpp

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+#include <KIconTheme>
+#include <KLocalizedContext>
+#include <KLocalizedString>
+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickStyle>
+#include <QUrl>
+#include <QtQml>
+#include <qapplication.h>
+
+int main(int argc, char *argv[]) {
+  KIconTheme::initTheme();
+  QApplication app(argc, argv);
+  KLocalizedString::setApplicationDomain("leek");
+  QApplication::setOrganizationName(QStringLiteral("Toast"));
+  QApplication::setOrganizationDomain(QStringLiteral("toast003.xyz"));
+  QApplication::setApplicationName(QStringLiteral("Leek"));
+  QApplication::setDesktopFileName(QStringLiteral("xyz.toast003.leek"));
+
+  QApplication::setStyle(QStringLiteral("breeze"));
+  if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE")) {
+    QQuickStyle::setStyle(QStringLiteral("org.kde.desktop"));
+  }
+
+  QQmlApplicationEngine engine;
+
+  engine.rootContext()->setContextObject(new KLocalizedContext(&engine));
+  engine.loadFromModule("xyz.toast003.leek", "Main");
+
+  if (engine.rootObjects().isEmpty()) {
+    return -1;
+  }
+
+  return app.exec();
+}

xyz.toast003.leek.desktop

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+[Desktop Entry]
+Name=Leek
+Type=Application
+Exec=leek
+Categories=Game;Utility;KDE;Qt
+Keywords=diva;mod,manager;hatsune;miku
+Icon=steam_icon_1761390
+Comment=Project Diva Mega Mix+ mod manager built with KDE technologies