core/command: add option to select newest matching instance

src/launch/command.cpp

@@ -102,9 +102,10 @@ int locateConfigFile(CommandState& cmd, QString& path) {
 	return 0;
 }
 
-void sortInstances(QVector<InstanceLockInfo>& list) {
+void sortInstances(QVector<InstanceLockInfo>& list, bool newestFirst) {
-	std::ranges::sort(list, [](const InstanceLockInfo& a, const InstanceLockInfo& b) {
+	std::ranges::sort(list, [=](const InstanceLockInfo& a, const InstanceLockInfo& b) {
-		return a.instance.launchTime < b.instance.launchTime;
+		auto r = a.instance.launchTime < b.instance.launchTime;
+		return newestFirst ? !r : r;
 	});
 };
 
@@ -153,7 +154,7 @@ int selectInstance(CommandState& cmd, InstanceLockInfo* instance) {
 		path = QDir(basePath->filePath("by-path")).filePath(pathId);
 
 		auto instances = QsPaths::collectInstances(path);
-		sortInstances(instances);
+		sortInstances(instances, cmd.config.newest);
 
 		if (instances.isEmpty()) {
 			qCInfo(logBare) << "No running instances for" << configFilePath;
@@ -227,7 +228,7 @@ int listInstances(CommandState& cmd) {
 			qCInfo(logBare) << "Use --all to list all instances.";
 		}
 	} else {
-		sortInstances(instances);
+		sortInstances(instances, cmd.config.newest);
 
 		if (cmd.output.json) {
 			auto array = QJsonArray();

src/launch/launch_p.hpp

@@ -49,6 +49,7 @@ struct CommandState {
 		QStringOption path;
 		QStringOption manifest;
 		QStringOption name;
+		bool newest = false;
 	} config;
 
 	struct {

src/launch/parsecommand.cpp

@@ -16,7 +16,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 	    .argv = argv,
 	};
 
-	auto addConfigSelection = [&](CLI::App* cmd) {
+	auto addConfigSelection = [&](CLI::App* cmd, bool withNewestOption = false) {
 		auto* group = cmd->add_option_group("Config Selection")
 		                  ->description("If no options in this group are specified,\n"
 		                                "$XDG_CONFIG_HOME/quickshell/shell.qml will be used.");
@@ -37,6 +37,11 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		                  "otherwise it is the name of a folder in $XDG_CONFIG_HOME/quickshell.")
 		    ->envname("QS_CONFIG_NAME");
 
+		if (withNewestOption) {
+			group->add_flag("-n,--newest", state.config.newest)
+			    ->description("Operate on the most recently launched instance instead of the oldest");
+		}
+
 		return group;
 	};
 
@@ -146,7 +151,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 
 		sub->add_flag("-j,--json", state.output.json, "Output the list as a json.");
 
-		addConfigSelection(sub)->excludes(all);
+		addConfigSelection(sub, true)->excludes(all);
 		addLoggingOptions(sub, false, true);
 
 		state.subcommand.list = sub;
@@ -156,7 +161,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		auto* sub = cli->add_subcommand("kill", "Kill quickshell instances.");
 		//sub->add_flag("-a,--all", "Kill all matching instances instead of just one.");
 		auto* instance = addInstanceSelection(sub);
-		addConfigSelection(sub)->excludes(instance);
+		addConfigSelection(sub, true)->excludes(instance);
 		addLoggingOptions(sub, false, true);
 
 		state.subcommand.kill = sub;
@@ -182,7 +187,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		    ->excludes(arguments);
 
 		auto* instance = addInstanceSelection(sub);
-		addConfigSelection(sub)->excludes(instance);
+		addConfigSelection(sub, true)->excludes(instance);
 		addLoggingOptions(sub, false, true);
 
 		sub->require_option();