core/qmlglobal: add shellId, instanceId, appId and launchTime props

Unclear how this should be handled long term.

CMakeLists.txt

@@ -87,8 +87,9 @@ include(cmake/util.cmake)
 
 add_compile_options(-Wall -Wextra -Wno-vla-cxx-extension)
 
-# pipewire defines this, breaking PCH
+# pipewire defines these, breaking PCH
 add_compile_definitions(_REENTRANT)
+add_compile_options(-fno-strict-overflow)
 
 if (FRAME_POINTERS)
 	add_compile_options(-fno-omit-frame-pointer)

src/core/qmlglobal.cpp

@@ -26,6 +26,7 @@
 #include "../io/processcore.hpp"
 #include "generation.hpp"
 #include "iconimageprovider.hpp"
+#include "instanceinfo.hpp"
 #include "paths.hpp"
 #include "qmlscreen.hpp"
 #include "rootwrapper.hpp"
@@ -153,6 +154,22 @@ qint32 QuickshellGlobal::processId() const { // NOLINT
 	return getpid();
 }
 
+QString QuickshellGlobal::instanceId() const { // NOLINT
+	return InstanceInfo::CURRENT.instanceId;
+}
+
+QString QuickshellGlobal::shellId() const { // NOLINT
+	return InstanceInfo::CURRENT.shellId;
+}
+
+QString QuickshellGlobal::appId() const { // NOLINT
+	return InstanceInfo::CURRENT.appId;
+}
+
+QDateTime QuickshellGlobal::launchTime() const { // NOLINT
+	return InstanceInfo::CURRENT.launchTime;
+}
+
 qsizetype QuickshellGlobal::screensCount(QQmlListProperty<QuickshellScreenInfo>* /*unused*/) {
 	return QuickshellTracked::instance()->screens.size();
 }

src/core/qmlglobal.hpp

@@ -17,6 +17,7 @@
 
 #include "../io/processcore.hpp"
 #include "doc.hpp"
+#include "instanceinfo.hpp"
 #include "qmlscreen.hpp"
 
 ///! Accessor for some options under the Quickshell type.
@@ -83,6 +84,21 @@ class QuickshellGlobal: public QObject {
 	// clang-format off
 	/// Quickshell's process id.
 	Q_PROPERTY(qint32 processId READ processId CONSTANT);
+	/// A unique identifier for this Quickshell instance
+	Q_PROPERTY(QString instanceId READ instanceId CONSTANT)
+	/// The shell ID, used to differentiate between different shell configurations.
+	///
+	/// Defaults to a stable value derived from the config path.
+	/// Can be overridden with `//@ pragma ShellId <id>` in the root qml file.
+	Q_PROPERTY(QString shellId READ shellId CONSTANT)
+	/// The desktop application ID.
+	///
+	/// Defaults to `org.quickshell`.
+	/// Can be overridden with `//@ pragma AppId <id>` in the root qml file
+	/// or the `QS_APP_ID` environment variable.
+	Q_PROPERTY(QString appId READ appId CONSTANT)
+	/// The time at which this Quickshell instance was launched.
+	Q_PROPERTY(QDateTime launchTime READ launchTime CONSTANT)
 	/// All currently connected screens.
 	///
 	/// This property updates as connected screens change.
@@ -149,6 +165,10 @@ class QuickshellGlobal: public QObject {
 
 public:
 	[[nodiscard]] qint32 processId() const;
+	[[nodiscard]] QString instanceId() const;
+	[[nodiscard]] QString shellId() const;
+	[[nodiscard]] QString appId() const;
+	[[nodiscard]] QDateTime launchTime() const;
 
 	QQmlListProperty<QuickshellScreenInfo> screens();