feat: add filesystem watcher and rename QtShell object

CMakeLists.txt

@@ -37,6 +37,7 @@ qt_add_executable(qtshell
 	src/cpp/rootwrapper.cpp
 	src/cpp/qmlglobal.cpp
 	src/cpp/qmlscreen.cpp
+	src/cpp/watcher.cpp
 )
 
 qt_add_qml_module(qtshell URI QtShell)

src/cpp/qmlglobal.hpp

@@ -13,7 +13,7 @@ class QtShellGlobal: public QObject {
 	Q_OBJECT;
 	Q_PROPERTY(QQmlListProperty<QtShellScreenInfo> screens READ screens NOTIFY screensChanged);
 	QML_SINGLETON;
-	QML_ELEMENT;
+	QML_NAMED_ELEMENT(QtShell);
 
 public:
 	QtShellGlobal(QObject* parent = nullptr);

src/cpp/rootwrapper.cpp

@@ -2,6 +2,7 @@
 #include <cstdlib>
 #include <utility>
 
+#include <qfileinfo.h>
 #include <qlogging.h>
 #include <qobject.h>
 #include <qqmlcomponent.h>
@@ -10,23 +11,26 @@
 
 #include "scavenge.hpp"
 #include "shell.hpp"
+#include "watcher.hpp"
 
-RootWrapper::RootWrapper(QUrl rootUrl):
-    QObject(nullptr), rootUrl(std::move(rootUrl)), engine(this) {
+RootWrapper::RootWrapper(QString rootPath):
+    QObject(nullptr), rootPath(std::move(rootPath)), engine(this) {
 	this->reloadGraph(true);
 
-	if (this->activeRoot == nullptr) {
+	if (this->root == nullptr) {
 		qCritical() << "could not create scene graph, exiting";
 		exit(-1); // NOLINT
 	}
 }
 
+QObject* RootWrapper::scavengeTargetFor(QObject* /* child */) { return this->root; }
+
 void RootWrapper::reloadGraph(bool hard) {
-	if (this->activeRoot != nullptr) {
+	if (this->root != nullptr) {
 		this->engine.clearComponentCache();
 	}
 
-	auto component = QQmlComponent(&this->engine, this->rootUrl);
+	auto component = QQmlComponent(&this->engine, QUrl::fromLocalFile(this->rootPath));
 
 	SCAVENGE_PARENT = hard ? nullptr : this;
 	auto* obj = component.beginCreate(this->engine.rootContext());
@@ -38,7 +42,7 @@ void RootWrapper::reloadGraph(bool hard) {
 		return;
 	}
 
-	auto* newRoot = qobject_cast<QtShell*>(obj);
+	auto* newRoot = qobject_cast<ShellRoot*>(obj);
 	if (newRoot == nullptr) {
 		qWarning() << "root component was not a QtShell";
 		delete obj;
@@ -47,26 +51,34 @@ void RootWrapper::reloadGraph(bool hard) {
 
 	component.completeCreate();
 
-	if (this->activeRoot != nullptr) {
-		this->activeRoot->deleteLater();
-		this->activeRoot = nullptr;
+	if (this->root != nullptr) {
+		this->root->deleteLater();
+		this->root = nullptr;
 	}
 
-	this->activeRoot = newRoot;
+	this->root = newRoot;
+	this->onConfigChanged();
 }
 
-void RootWrapper::changeRoot(QtShell* newRoot) {
-	if (this->activeRoot != nullptr) {
-		QObject::disconnect(this->destroyConnection);
-		this->activeRoot->deleteLater();
-	}
+void RootWrapper::onConfigChanged() {
+	auto config = this->root->config();
 
-	if (newRoot != nullptr) {
-		this->activeRoot = newRoot;
-		QObject::connect(this->activeRoot, &QtShell::destroyed, this, &RootWrapper::destroy);
+	if (config.mWatchFiles && this->configWatcher == nullptr) {
+		this->configWatcher = new FiletreeWatcher();
+		this->configWatcher->addPath(QFileInfo(this->rootPath).dir().path());
+
+		QObject::connect(this->root, &ShellRoot::configChanged, this, &RootWrapper::onConfigChanged);
+
+		QObject::connect(
+		    this->configWatcher,
+		    &FiletreeWatcher::fileChanged,
+		    this,
+		    &RootWrapper::onWatchedFilesChanged
+		);
+	} else if (!config.mWatchFiles && this->configWatcher != nullptr) {
+		this->configWatcher->deleteLater();
+		this->configWatcher = nullptr;
 	}
 }
 
-QObject* RootWrapper::scavengeTargetFor(QObject* /* child */) { return this->activeRoot; }
-
-void RootWrapper::destroy() { this->deleteLater(); }
+void RootWrapper::onWatchedFilesChanged() { this->reloadGraph(false); }

src/cpp/rootwrapper.hpp

@@ -1,31 +1,31 @@
 #pragma once
 
 #include <qobject.h>
-#include <qobjectdefs.h>
 #include <qqmlengine.h>
 #include <qtmetamacros.h>
 #include <qurl.h>
 
 #include "scavenge.hpp"
 #include "shell.hpp"
+#include "watcher.hpp"
 
 class RootWrapper: public QObject, virtual public Scavengeable {
 	Q_OBJECT;
 
 public:
-	explicit RootWrapper(QUrl rootUrl);
-
-	void reloadGraph(bool hard);
-	void changeRoot(QtShell* newRoot);
+	explicit RootWrapper(QString rootPath);
 
 	QObject* scavengeTargetFor(QObject* child) override;
 
+	void reloadGraph(bool hard);
+
 private slots:
-	void destroy();
+	void onConfigChanged();
+	void onWatchedFilesChanged();
 
 private:
-	QUrl rootUrl;
+	QString rootPath;
 	QQmlEngine engine;
-	QtShell* activeRoot = nullptr;
-	QMetaObject::Connection destroyConnection;
+	ShellRoot* root = nullptr;
+	FiletreeWatcher* configWatcher = nullptr;
 };

src/cpp/shell.cpp

@@ -3,16 +3,17 @@
 
 #include <qobject.h>
 #include <qqmllist.h>
+#include <qtmetamacros.h>
 
-void QtShell::earlyInit(QObject* old) {
-	auto* oldshell = qobject_cast<QtShell*>(old);
+void ShellRoot::earlyInit(QObject* old) {
+	auto* oldshell = qobject_cast<ShellRoot*>(old);
 
 	if (oldshell != nullptr) {
 		this->scavengeableChildren = std::move(oldshell->children);
 	}
 }
 
-QObject* QtShell::scavengeTargetFor(QObject* /* child */) {
+QObject* ShellRoot::scavengeTargetFor(QObject* /* child */) {
 	if (this->scavengeableChildren.length() > this->children.length()) {
 		return this->scavengeableChildren[this->children.length()];
 	}
@@ -20,11 +21,19 @@ QObject* QtShell::scavengeTargetFor(QObject* /* child */) {
 	return nullptr;
 }
 
-QQmlListProperty<QObject> QtShell::components() {
+void ShellRoot::setConfig(ShellConfig config) {
+	this->mConfig = config;
+
+	emit this->configChanged();
+}
+
+ShellConfig ShellRoot::config() const { return this->mConfig; }
+
+QQmlListProperty<QObject> ShellRoot::components() {
 	return QQmlListProperty<QObject>(
 	    this,
 	    nullptr,
-	    &QtShell::appendComponent,
+	    &ShellRoot::appendComponent,
 	    nullptr,
 	    nullptr,
 	    nullptr,
@@ -33,8 +42,8 @@ QQmlListProperty<QObject> QtShell::components() {
 	);
 }
 
-void QtShell::appendComponent(QQmlListProperty<QObject>* list, QObject* component) {
-	auto* shell = static_cast<QtShell*>(list->object); // NOLINT
+void ShellRoot::appendComponent(QQmlListProperty<QObject>* list, QObject* component) {
+	auto* shell = static_cast<ShellRoot*>(list->object); // NOLINT
 	component->setParent(shell);
 	shell->children.append(component);
 }

src/cpp/shell.hpp

@@ -9,24 +9,40 @@
 
 #include "scavenge.hpp"
 
-class QtShell: public Scavenger, virtual public Scavengeable {
+class ShellConfig {
+	Q_GADGET;
+	Q_PROPERTY(bool watchFiles MEMBER mWatchFiles);
+
+public:
+	bool mWatchFiles = true;
+};
+
+class ShellRoot: public Scavenger, virtual public Scavengeable {
 	Q_OBJECT;
+	Q_PROPERTY(ShellConfig config READ config WRITE setConfig);
 	Q_PROPERTY(QQmlListProperty<QObject> components READ components FINAL);
 	Q_CLASSINFO("DefaultProperty", "components");
 	QML_ELEMENT;
 
 public:
-	explicit QtShell(QObject* parent = nullptr): Scavenger(parent) {}
+	explicit ShellRoot(QObject* parent = nullptr): Scavenger(parent) {}
 
 	void earlyInit(QObject* old) override;
 	QObject* scavengeTargetFor(QObject* child) override;
 
+	void setConfig(ShellConfig config);
+	[[nodiscard]] ShellConfig config() const;
+
 	QQmlListProperty<QObject> components();
 
+signals:
+	void configChanged();
+
 private:
 	static void appendComponent(QQmlListProperty<QObject>* list, QObject* component);
 
-public:
+	ShellConfig mConfig;
+
 	// track only the children assigned to `components` in order
 	QList<QObject*> children;
 	QList<QObject*> scavengeableChildren;

src/cpp/watcher.cpp

@@ -0,0 +1,38 @@
+#include "watcher.hpp"
+
+#include <qdir.h>
+#include <qfileinfo.h>
+#include <qfilesystemwatcher.h>
+#include <qobject.h>
+#include <qtmetamacros.h>
+
+FiletreeWatcher::FiletreeWatcher(QObject* parent): QObject(parent) {
+	QObject::connect(
+	    &this->watcher,
+	    &QFileSystemWatcher::fileChanged,
+	    this,
+	    &FiletreeWatcher::onFileChanged
+	);
+
+	QObject::connect(
+	    &this->watcher,
+	    &QFileSystemWatcher::directoryChanged,
+	    this,
+	    &FiletreeWatcher::onDirectoryChanged
+	);
+}
+void FiletreeWatcher::addPath(const QString& path) {
+	this->watcher.addPath(path);
+
+	if (QFileInfo(path).isDir()) {
+		auto dir = QDir(path);
+
+		for (auto& entry: dir.entryList(QDir::AllEntries | QDir::NoDotAndDotDot)) {
+			this->addPath(dir.filePath(entry));
+		}
+	}
+}
+
+void FiletreeWatcher::onDirectoryChanged(const QString& path) { this->addPath(path); }
+
+void FiletreeWatcher::onFileChanged(const QString& path) { emit this->fileChanged(path); }

src/cpp/watcher.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <qdir.h>
+#include <qfilesystemwatcher.h>
+#include <qobject.h>
+
+class FiletreeWatcher: public QObject {
+	Q_OBJECT;
+
+public:
+	explicit FiletreeWatcher(QObject* parent = nullptr);
+
+	void addPath(const QString& path);
+
+signals:
+	void fileChanged(const QString& path);
+
+private slots:
+	void onDirectoryChanged(const QString& path);
+	void onFileChanged(const QString& path);
+
+private:
+	QFileSystemWatcher watcher;
+};