Reactor.cc

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#include "Reactor.hh"
#include "CommandLineParser.hh"
#include "RTScheduler.hh"
#include "EventDistributor.hh"
#include "GlobalCommandController.hh"
#include "InputEventGenerator.hh"
#include "InputEvents.hh"
#include "DiskFactory.hh"
#include "DiskManipulator.hh"
#include "DiskChanger.hh"
#include "FilePool.hh"
#include "UserSettings.hh"
#include "RomDatabase.hh"
#include "RomInfo.hh"
#include "TclCallbackMessages.hh"
#include "MSXMotherBoard.hh"
#include "StateChangeDistributor.hh"
#include "Command.hh"
#include "AfterCommand.hh"
#include "MessageCommand.hh"
#include "CommandException.hh"
#include "GlobalCliComm.hh"
#include "InfoTopic.hh"
#include "Display.hh"
#include "VideoSystem.hh"
#include "Mixer.hh"
#include "AviRecorder.hh"
#include "GlobalSettings.hh"
#include "BooleanSetting.hh"
#include "EnumSetting.hh"
#include "TclObject.hh"
#include "HardwareConfig.hh"
#include "XMLElement.hh"
#include "XMLException.hh"
#include "FileContext.hh"
#include "FileException.hh"
#include "FileOperations.hh"
#include "foreach_file.hh"
#include "Thread.hh"
#include "Timer.hh"
#include "serialize.hh"
#include "checked_cast.hh"
#include "ranges.hh"
#include "statp.hh"
#include "stl.hh"
#include "StringOp.hh"
#include "unreachable.hh"
#include "view.hh"
#include "build-info.hh"
#include <cassert>
#include <memory>
 
using std::make_shared;
using std::make_unique;
using std::string;
using std::string_view;
using std::vector;
 
namespace openmsx {
 
// global variable to communicate the exit-code from the 'exit' command to main()
int exitCode = 0;
 
class ExitCommand final : public Command
{
public:
        ExitCommand(CommandController& commandController, EventDistributor& distributor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        EventDistributor& distributor;
};
 
class MachineCommand final : public Command
{
public:
        MachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class TestMachineCommand final : public Command
{
public:
        TestMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class CreateMachineCommand final : public Command
{
public:
        CreateMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class DeleteMachineCommand final : public Command
{
public:
        DeleteMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class ListMachinesCommand final : public Command
{
public:
        ListMachinesCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class ActivateMachineCommand final : public Command
{
public:
        ActivateMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class StoreMachineCommand final : public Command
{
public:
        StoreMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class RestoreMachineCommand final : public Command
{
public:
        RestoreMachineCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class GetClipboardCommand final : public Command
{
public:
        GetClipboardCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class SetClipboardCommand final : public Command
{
public:
        SetClipboardCommand(CommandController& commandController, Reactor& reactor);
        void execute(span<const TclObject> tokens, TclObject& result) override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        Reactor& reactor;
};
 
class ConfigInfo final : public InfoTopic
{
public:
        ConfigInfo(InfoCommand& openMSXInfoCommand, const string& configName);
        void execute(span<const TclObject> tokens,
                     TclObject& result) const override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
        void tabCompletion(vector<string>& tokens) const override;
private:
        const string configName;
};
 
class RealTimeInfo final : public InfoTopic
{
public:
        explicit RealTimeInfo(InfoCommand& openMSXInfoCommand);
        void execute(span<const TclObject> tokens,
                     TclObject& result) const override;
        [[nodiscard]] string help(const vector<string>& tokens) const override;
private:
        const uint64_t reference;
};
 
class SoftwareInfoTopic final : InfoTopic
{
public:
        SoftwareInfoTopic(InfoCommand& openMSXInfoCommand, Reactor& reactor);
        void execute(span<const TclObject> tokens,
                     TclObject& result) const override;
        [[nodiscard]] std::string help(const std::vector<std::string>& tokens) const override;
private:
        Reactor& reactor;
};
 
 
Reactor::Reactor() = default;
 
void Reactor::init()
{
        rtScheduler = make_unique<RTScheduler>();
        eventDistributor = make_unique<EventDistributor>(*this);
        globalCliComm = make_unique<GlobalCliComm>();
        globalCommandController = make_unique<GlobalCommandController>(
                *eventDistributor, *globalCliComm, *this);
        globalSettings = make_unique<GlobalSettings>(
                *globalCommandController);
        inputEventGenerator = make_unique<InputEventGenerator>(
                *globalCommandController, *eventDistributor, *globalSettings);
        diskFactory = make_unique<DiskFactory>(
                *this);
        diskManipulator = make_unique<DiskManipulator>(
                *globalCommandController, *this);
        virtualDrive = make_unique<DiskChanger>(
                *this, "virtual_drive");
        filePool = make_unique<FilePool>(*globalCommandController, *this);
        userSettings = make_unique<UserSettings>(
                *globalCommandController);
        afterCommand = make_unique<AfterCommand>(
                *this, *eventDistributor, *globalCommandController);
        exitCommand = make_unique<ExitCommand>(
                *globalCommandController, *eventDistributor);
        messageCommand = make_unique<MessageCommand>(
                *globalCommandController);
        machineCommand = make_unique<MachineCommand>(
                *globalCommandController, *this);
        testMachineCommand = make_unique<TestMachineCommand>(
                *globalCommandController, *this);
        createMachineCommand = make_unique<CreateMachineCommand>(
                *globalCommandController, *this);
        deleteMachineCommand = make_unique<DeleteMachineCommand>(
                *globalCommandController, *this);
        listMachinesCommand = make_unique<ListMachinesCommand>(
                *globalCommandController, *this);
        activateMachineCommand = make_unique<ActivateMachineCommand>(
                *globalCommandController, *this);
        storeMachineCommand = make_unique<StoreMachineCommand>(
                *globalCommandController, *this);
        restoreMachineCommand = make_unique<RestoreMachineCommand>(
                *globalCommandController, *this);
        getClipboardCommand = make_unique<GetClipboardCommand>(
                *globalCommandController, *this);
        setClipboardCommand = make_unique<SetClipboardCommand>(
                *globalCommandController, *this);
        aviRecordCommand = make_unique<AviRecorder>(*this);
        extensionInfo = make_unique<ConfigInfo>(
                getOpenMSXInfoCommand(), "extensions");
        machineInfo   = make_unique<ConfigInfo>(
                getOpenMSXInfoCommand(), "machines");
        realTimeInfo = make_unique<RealTimeInfo>(
                getOpenMSXInfoCommand());
        softwareInfoTopic = make_unique<SoftwareInfoTopic>(
                getOpenMSXInfoCommand(), *this);
        tclCallbackMessages = make_unique<TclCallbackMessages>(
                *globalCliComm, *globalCommandController);
 
        createMachineSetting();
 
        getGlobalSettings().getPauseSetting().attach(*this);
 
        eventDistributor->registerEventListener(OPENMSX_QUIT_EVENT, *this);
#if PLATFORM_ANDROID
        eventDistributor->registerEventListener(OPENMSX_FOCUS_EVENT, *this);
#endif
        isInit = true;
}
 
Reactor::~Reactor()
{
        if (!isInit) return;
        deleteBoard(activeBoard);
 
        eventDistributor->unregisterEventListener(OPENMSX_QUIT_EVENT, *this);
#if PLATFORM_ANDROID
        eventDistributor->unregisterEventListener(OPENMSX_FOCUS_EVENT, *this);
#endif
 
        getGlobalSettings().getPauseSetting().detach(*this);
}
 
Mixer& Reactor::getMixer()
{
        if (!mixer) {
                mixer = make_unique<Mixer>(*this, *globalCommandController);
        }
        return *mixer;
}
 
RomDatabase& Reactor::getSoftwareDatabase()
{
        if (!softwareDatabase) {
                softwareDatabase = make_unique<RomDatabase>(*globalCliComm);
        }
        return *softwareDatabase;
}
 
CliComm& Reactor::getCliComm()
{
        return *globalCliComm;
}
 
Interpreter& Reactor::getInterpreter()
{
        return getGlobalCommandController().getInterpreter();
}
 
CommandController& Reactor::getCommandController()
{
        return *globalCommandController;
}
 
InfoCommand& Reactor::getOpenMSXInfoCommand()
{
        return globalCommandController->getOpenMSXInfoCommand();
}
 
vector<string> Reactor::getHwConfigs(string_view type)
{
        vector<string> result;
        for (const auto& p : systemFileContext().getPaths()) {
                auto fileAction = [&](const std::string& /*path*/, std::string_view name) {
                        if (StringOp::endsWith(name, ".xml")) {
                                name.remove_suffix(4);
                                result.emplace_back(name);
                        }
                };
                auto dirAction = [&](std::string& path, std::string_view name) {
                        auto size = path.size();
                        path += "/hardwareconfig.xml";
                        if (FileOperations::isRegularFile(path)) {
                                result.emplace_back(name);
                        }
                        path.resize(size);
                };
                foreach_file_and_directory(FileOperations::join(p, type), fileAction, dirAction);
        }
        // remove duplicates
        ranges::sort(result);
        result.erase(ranges::unique(result), end(result));
        return result;
}
 
void Reactor::createMachineSetting()
{
        auto names = getHwConfigs("machines");
        EnumSetting<int>::Map machines; // int's are unique dummy values
        machines.reserve(names.size() + 1);
        int count = 1;
        append(machines, view::transform(names,
                [&](auto& name) { return std::pair(std::move(name), count++); }));
        machines.emplace_back("C-BIOS_MSX2+", 0); // default machine
 
        machineSetting = make_unique<EnumSetting<int>>(
                *globalCommandController, "default_machine",
                "default machine (takes effect next time openMSX is started)",
                0, std::move(machines));
}
 
MSXMotherBoard* Reactor::getMotherBoard() const
{
        assert(Thread::isMainThread());
        return activeBoard.get();
}
 
string_view Reactor::getMachineID() const
{
        return activeBoard ? activeBoard->getMachineID() : string_view{};
}
 
vector<string_view> Reactor::getMachineIDs() const
{
        return to_vector(view::transform(
                boards, [](auto& b) { return b->getMachineID(); }));
}
 
Reactor::Board Reactor::getMachine(string_view machineID) const
{
        for (auto& b : boards) {
                if (b->getMachineID() == machineID) {
                        return b;
                }
        }
        throw CommandException("No machine with ID: ", machineID);
}
 
Reactor::Board Reactor::createEmptyMotherBoard()
{
        return make_shared<MSXMotherBoard>(*this);
}
 
void Reactor::replaceBoard(MSXMotherBoard& oldBoard_, Board newBoard)
{
        assert(Thread::isMainThread());
 
        // Add new board.
        boards.push_back(newBoard);
 
        // Lookup old board (it must be present).
        auto it = find_if_unguarded(boards,
                [&](auto& b) { return b.get() == &oldBoard_; });
 
        // If the old board was the active board, then activate the new board
        if (*it == activeBoard) {
                switchBoard(newBoard);
        }
 
        // Remove the old board.
        move_pop_back(boards, it);
}
 
void Reactor::switchMachine(const string& machine)
{
        if (!display) {
                display = make_unique<Display>(*this);
                // TODO: Currently it is not possible to move this call into the
                //       constructor of Display because the call to createVideoSystem()
                //       indirectly calls Reactor.getDisplay().
                display->createVideoSystem();
        }
 
        // create+load new machine
        // switch to new machine
        // delete old active machine
 
        assert(Thread::isMainThread());
        // Note: loadMachine can throw an exception and in that case the
        //       motherboard must be considered as not created at all.
        auto newBoard = createEmptyMotherBoard();
        newBoard->loadMachine(machine);
        boards.push_back(newBoard);
 
        auto oldBoard = activeBoard;
        switchBoard(newBoard);
        deleteBoard(oldBoard);
}
 
void Reactor::switchBoard(Board newBoard)
{
        assert(Thread::isMainThread());
        assert(!newBoard || contains(boards, newBoard));
        assert(!activeBoard || contains(boards, activeBoard));
        if (activeBoard) {
                activeBoard->activate(false);
        }
        {
                // Don't hold the lock for longer than the actual switch.
                // In the past we had a potential for deadlocks here, because
                // (indirectly) the code below still acquires other locks.
                std::lock_guard<std::mutex> lock(mbMutex);
                activeBoard = newBoard;
        }
        eventDistributor->distributeEvent(
                make_shared<SimpleEvent>(OPENMSX_MACHINE_LOADED_EVENT));
        globalCliComm->update(CliComm::HARDWARE, getMachineID(), "select");
        if (activeBoard) {
                activeBoard->activate(true);
        }
}
 
void Reactor::deleteBoard(Board board)
{
        // Note: pass 'board' by-value to keep the parameter from changing
        // after the call to switchBoard(). switchBoard() changes the
        // 'activeBoard' member variable, so the 'board' parameter would change
        // if it were passed by reference to this method (AFAICS this only
        // happens in ~Reactor()).
        assert(Thread::isMainThread());
        if (!board) return;
 
        if (board == activeBoard) {
                // delete active board -> there is no active board anymore
                switchBoard(nullptr);
        }
        auto it = rfind_unguarded(boards, board);
        move_pop_back(boards, it);
}
 
void Reactor::enterMainLoop()
{
        // Note: this method can get called from different threads
        if (Thread::isMainThread()) {
                // Don't take lock in main thread to avoid recursive locking.
                if (activeBoard) {
                        activeBoard->exitCPULoopSync();
                }
        } else {
                std::lock_guard<std::mutex> lock(mbMutex);
                if (activeBoard) {
                        activeBoard->exitCPULoopAsync();
                }
        }
}
 
void Reactor::run(CommandLineParser& parser)
{
        auto& commandController = *globalCommandController;
 
        // execute init.tcl
        try {
                commandController.source(
                        preferSystemFileContext().resolve("init.tcl"));
        } catch (FileException&) {
                // no init.tcl, ignore
        }
 
        // execute startup scripts
        for (const auto& s : parser.getStartupScripts()) {
                try {
                        commandController.source(userFileContext().resolve(s));
                } catch (FileException& e) {
                        throw FatalError("Couldn't execute script: ",
                                         e.getMessage());
                }
        }
        for (const auto& cmd : parser.getStartupCommands()) {
                try {
                        commandController.executeCommand(cmd);
                } catch (CommandException& e) {
                        throw FatalError("Couldn't execute command: ", cmd,
                                         '\n', e.getMessage());
                }
        }
 
        // At this point openmsx is fully started, it's OK now to start
        // accepting external commands
        getGlobalCliComm().setAllowExternalCommands();
 
        // Run
        if (parser.getParseStatus() == CommandLineParser::RUN) {
                // don't use Tcl to power up the machine, we cannot pass
                // exceptions through Tcl and ADVRAM might throw in its
                // powerUp() method. Solution is to implement dependencies
                // between devices so ADVRAM can check the error condition
                // in its constructor
                //commandController.executeCommand("set power on");
                if (activeBoard) {
                        activeBoard->powerUp();
                }
        }
 
        while (doOneIteration()) {
                // nothing
        }
}
 
bool Reactor::doOneIteration()
{
        eventDistributor->deliverEvents();
        bool blocked = (blockedCounter > 0) || !activeBoard;
        if (!blocked) {
                // copy shared_ptr to keep Board alive (e.g. in case of Tcl
                // callbacks)
                auto copy = activeBoard;
                blocked = !copy->execute();
        }
        if (blocked) {
                // At first sight a better alternative is to use the
                // SDL_WaitEvent() function. Though when inspecting
                // the implementation of that function, it turns out
                // to also use a sleep/poll loop, with even shorter
                // sleep periods as we use here. Maybe in future
                // SDL implementations this will be improved.
                eventDistributor->sleep(20 * 1000);
        }
        return running;
}
 
void Reactor::unpause()
{
        if (paused) {
                paused = false;
                globalCliComm->update(CliComm::STATUS, "paused", "false");
                unblock();
        }
}
 
void Reactor::pause()
{
        if (!paused) {
                paused = true;
                globalCliComm->update(CliComm::STATUS, "paused", "true");
                block();
        }
}
 
void Reactor::block()
{
        ++blockedCounter;
        enterMainLoop();
        getMixer().mute();
}
 
void Reactor::unblock()
{
        --blockedCounter;
        assert(blockedCounter >= 0);
        getMixer().unmute();
}
 
 
// Observer<Setting>
void Reactor::update(const Setting& setting) noexcept
{
        auto& pauseSetting = getGlobalSettings().getPauseSetting();
        if (&setting == &pauseSetting) {
                if (pauseSetting.getBoolean()) {
                        pause();
                } else {
                        unpause();
                }
        }
}
 
// EventListener
int Reactor::signalEvent(const std::shared_ptr<const Event>& event) noexcept
{
        auto type = event->getType();
        if (type == OPENMSX_QUIT_EVENT) {
                enterMainLoop();
                running = false;
#if PLATFORM_ANDROID
        } else if (type == OPENMSX_FOCUS_EVENT) {
                // Android SDL port sends a (un)focus event when an app is put in background
                // by the OS for whatever reason (like an incoming phone call) and all screen
                // resources are taken away from the app.
                // In such case the app is supposed to behave as a good citizen
                // and minimize its resource usage and related battery drain.
                // The SDL Android port already takes care of halting the Java
                // part of the sound processing. The Display class makes sure that it wont try
                // to render anything to the (temporary missing) graphics resources but the
                // main emulation should also be temporary stopped, in order to minimize CPU usage
                auto& focusEvent = checked_cast<const FocusEvent&>(*event);
                if (focusEvent.getGain()) {
                        unblock();
                } else {
                        block();
                }
#endif
        } else {
                UNREACHABLE; // we didn't subscribe to this event...
        }
        return 0;
}
 
 
// class ExitCommand
 
ExitCommand::ExitCommand(CommandController& commandController_,
                         EventDistributor& distributor_)
        : Command(commandController_, "exit")
        , distributor(distributor_)
{
}
 
void ExitCommand::execute(span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, Between{1, 2}, Prefix{1}, "?exitcode?");
        switch (tokens.size()) {
        case 1:
                exitCode = 0;
                break;
        case 2:
                exitCode = tokens[1].getInt(getInterpreter());
                break;
        }
        distributor.distributeEvent(make_shared<QuitEvent>());
}
 
string ExitCommand::help(const vector<string>& /*tokens*/) const
{
        return "Use this command to stop the emulator.\n"
               "Optionally you can pass an exit-code.\n";
}
 
 
// class MachineCommand
 
MachineCommand::MachineCommand(CommandController& commandController_,
                               Reactor& reactor_)
        : Command(commandController_, "machine")
        , reactor(reactor_)
{
}
 
void MachineCommand::execute(span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, Between{1, 2}, Prefix{1}, "?machinetype?");
        switch (tokens.size()) {
        case 1: // get current machine
                // nothing
                break;
        case 2:
                try {
                        reactor.switchMachine(string(tokens[1].getString()));
                } catch (MSXException& e) {
                        throw CommandException("Machine switching failed: ",
                                               e.getMessage());
                }
                break;
        }
        // Always return machineID (of current or of new machine).
        result = reactor.getMachineID();
}
 
string MachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "Switch to a different MSX machine.";
}
 
void MachineCommand::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, Reactor::getHwConfigs("machines"));
}
 
 
// class TestMachineCommand
 
TestMachineCommand::TestMachineCommand(CommandController& commandController_,
                                       Reactor& reactor_)
        : Command(commandController_, "test_machine")
        , reactor(reactor_)
{
}
 
void TestMachineCommand::execute(span<const TclObject> tokens,
                                 TclObject& result)
{
        checkNumArgs(tokens, 2, "machinetype");
        try {
                MSXMotherBoard mb(reactor);
                mb.loadMachine(string(tokens[1].getString()));
        } catch (MSXException& e) {
                result = e.getMessage(); // error
        }
}
 
string TestMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "Test the configuration for the given machine. "
               "Returns an error message explaining why the configuration is "
               "invalid or an empty string in case of success.";
}
 
void TestMachineCommand::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, Reactor::getHwConfigs("machines"));
}
 
 
// class CreateMachineCommand
 
CreateMachineCommand::CreateMachineCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "create_machine")
        , reactor(reactor_)
{
}
 
void CreateMachineCommand::execute(span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 1, Prefix{1}, nullptr);
        auto newBoard = reactor.createEmptyMotherBoard();
        result = newBoard->getMachineID();
        reactor.boards.push_back(move(newBoard));
}
 
string CreateMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "Creates a new (empty) MSX machine. Returns the ID for the new "
               "machine.\n"
               "Use 'load_machine' to actually load a machine configuration "
               "into this new machine.\n"
               "The main reason create_machine and load_machine are two "
               "separate commands is that sometimes you already want to know "
               "the ID of the machine before load_machine starts emitting "
               "events for this machine.";
}
 
 
// class DeleteMachineCommand
 
DeleteMachineCommand::DeleteMachineCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "delete_machine")
        , reactor(reactor_)
{
}
 
void DeleteMachineCommand::execute(span<const TclObject> tokens,
                                   TclObject& /*result*/)
{
        checkNumArgs(tokens, 2, "id");
        reactor.deleteBoard(reactor.getMachine(tokens[1].getString()));
}
 
string DeleteMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "Deletes the given MSX machine.";
}
 
void DeleteMachineCommand::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, reactor.getMachineIDs());
}
 
 
// class ListMachinesCommand
 
ListMachinesCommand::ListMachinesCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "list_machines")
        , reactor(reactor_)
{
}
 
void ListMachinesCommand::execute(span<const TclObject> /*tokens*/,
                                  TclObject& result)
{
        result.addListElements(reactor.getMachineIDs());
}
 
string ListMachinesCommand::help(const vector<string>& /*tokens*/) const
{
        return "Returns a list of all machine IDs.";
}
 
 
// class ActivateMachineCommand
 
ActivateMachineCommand::ActivateMachineCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "activate_machine")
        , reactor(reactor_)
{
}
 
void ActivateMachineCommand::execute(span<const TclObject> tokens,
                                     TclObject& result)
{
        checkNumArgs(tokens, Between{1, 2}, Prefix{1}, "id");
        switch (tokens.size()) {
        case 1:
                break;
        case 2:
                reactor.switchBoard(reactor.getMachine(tokens[1].getString()));
                break;
        }
        result = reactor.getMachineID();
}
 
string ActivateMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "Make another machine the active msx machine.\n"
               "Or when invoked without arguments, query the ID of the "
               "active msx machine.";
}
 
void ActivateMachineCommand::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, reactor.getMachineIDs());
}
 
 
// class StoreMachineCommand
 
StoreMachineCommand::StoreMachineCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "store_machine")
        , reactor(reactor_)
{
}
 
void StoreMachineCommand::execute(span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, Between{1, 3}, Prefix{1}, "?id? ?filename?");
        string filename;
        string_view machineID;
        switch (tokens.size()) {
        case 1:
                machineID = reactor.getMachineID();
                filename = FileOperations::getNextNumberedFileName("savestates", "openmsxstate", ".xml.gz");
                break;
        case 2:
                machineID = tokens[1].getString();
                filename = FileOperations::getNextNumberedFileName("savestates", "openmsxstate", ".xml.gz");
                break;
        case 3:
                machineID = tokens[1].getString();
                filename = tokens[2].getString();
                break;
        }
 
        auto& board = *reactor.getMachine(machineID);
 
        XmlOutputArchive out(filename);
        out.serialize("machine", board);
        out.close();
        result = filename;
}
 
string StoreMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return
                "store_machine                       Save state of current machine to file \"openmsxNNNN.xml.gz\"\n"
                "store_machine machineID             Save state of machine \"machineID\" to file \"openmsxNNNN.xml.gz\"\n"
                "store_machine machineID <filename>  Save state of machine \"machineID\" to indicated file\n"
                "\n"
                "This is a low-level command, the 'savestate' script is easier to use.";
}
 
void StoreMachineCommand::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, reactor.getMachineIDs());
}
 
 
// class RestoreMachineCommand
 
RestoreMachineCommand::RestoreMachineCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "restore_machine")
        , reactor(reactor_)
{
}
 
void RestoreMachineCommand::execute(span<const TclObject> tokens,
                                    TclObject& result)
{
        checkNumArgs(tokens, Between{1, 2}, Prefix{1}, "?filename?");
        auto newBoard = reactor.createEmptyMotherBoard();
 
        string filename;
        switch (tokens.size()) {
        case 1: {
                // load last saved entry
                string lastEntry;
                time_t lastTime = 0;
                foreach_file(
                        FileOperations::getUserOpenMSXDir() + "/savestates",
                        [&](const string& path, const FileOperations::Stat& st) {
                                time_t modTime = st.st_mtime;
                                if (modTime > lastTime) {
                                        filename = path;
                                        lastTime = modTime;
                                }
                        });
                if (filename.empty()) {
                        throw CommandException("Can't find last saved state.");
                }
                break;
        }
        case 2:
                filename = FileOperations::expandTilde(string(tokens[1].getString()));
                break;
        }
 
        //std::cerr << "Loading " << filename << '\n';
        try {
                XmlInputArchive in(filename);
                in.serialize("machine", *newBoard);
        } catch (XMLException& e) {
                throw CommandException("Cannot load state, bad file format: ",
                                       e.getMessage());
        } catch (MSXException& e) {
                throw CommandException("Cannot load state: ", e.getMessage());
        }
 
        // Savestate also contains stuff like the keyboard state at the moment
        // the snapshot was created (this is required for reverse/replay). But
        // now we want the MSX to see the actual host keyboard state.
        newBoard->getStateChangeDistributor().stopReplay(newBoard->getCurrentTime());
 
        result = newBoard->getMachineID();
        reactor.boards.push_back(move(newBoard));
}
 
string RestoreMachineCommand::help(const vector<string>& /*tokens*/) const
{
        return "restore_machine                       Load state from last saved state in default directory\n"
               "restore_machine <filename>            Load state from indicated file\n"
               "\n"
               "This is a low-level command, the 'loadstate' script is easier to use.";
}
 
void RestoreMachineCommand::tabCompletion(vector<string>& tokens) const
{
        // TODO: add the default files (state files in user's savestates dir)
        completeFileName(tokens, userFileContext());
}
 
 
// class GetClipboardCommand
 
GetClipboardCommand::GetClipboardCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "get_clipboard_text")
        , reactor(reactor_)
{
        // Note: cannot yet call getReactor().getDisplay() (e.g. to cache it)
        //   display may not yet be initialized.
}
 
void GetClipboardCommand::execute(span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 1, Prefix{1}, nullptr);
        result = reactor.getDisplay().getVideoSystem().getClipboardText();
}
 
string GetClipboardCommand::help(const vector<string>& /*tokens*/) const
{
        return "Returns the (text) content of the clipboard as a string.";
}
 
 
// class SetClipboardCommand
 
SetClipboardCommand::SetClipboardCommand(
        CommandController& commandController_, Reactor& reactor_)
        : Command(commandController_, "set_clipboard_text")
        , reactor(reactor_)
{
}
 
void SetClipboardCommand::execute(span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 2, "text");
        reactor.getDisplay().getVideoSystem().setClipboardText(tokens[1].getString());
}
 
string SetClipboardCommand::help(const vector<string>& /*tokens*/) const
{
        return "Send the given string to the clipboard.";
}
 
 
// class ConfigInfo
 
ConfigInfo::ConfigInfo(InfoCommand& openMSXInfoCommand,
                       const string& configName_)
        : InfoTopic(openMSXInfoCommand, configName_)
        , configName(configName_)
{
}
 
void ConfigInfo::execute(span<const TclObject> tokens, TclObject& result) const
{
        // TODO make meta info available through this info topic
        switch (tokens.size()) {
        case 2: {
                result.addListElements(Reactor::getHwConfigs(configName));
                break;
        }
        case 3: {
                try {
                        auto config = HardwareConfig::loadConfig(
                                configName, tokens[2].getString());
                        if (auto* info = config.findChild("info")) {
                                for (const auto& i : info->getChildren()) {
                                        result.addDictKeyValue(i.getName(), i.getData());
                                }
                        }
                } catch (MSXException& e) {
                        throw CommandException(
                                "Couldn't get config info: ", e.getMessage());
                }
                break;
        }
        default:
                throw CommandException("Too many parameters");
        }
}
 
string ConfigInfo::help(const vector<string>& /*tokens*/) const
{
        return strCat("Shows a list of available ", configName, ", "
                      "or get meta information about the selected item.\n");
}
 
void ConfigInfo::tabCompletion(vector<string>& tokens) const
{
        completeString(tokens, Reactor::getHwConfigs(configName));
}
 
 
// class RealTimeInfo
 
RealTimeInfo::RealTimeInfo(InfoCommand& openMSXInfoCommand)
        : InfoTopic(openMSXInfoCommand, "realtime")
        , reference(Timer::getTime())
{
}
 
void RealTimeInfo::execute(span<const TclObject> /*tokens*/,
                           TclObject& result) const
{
        auto delta = Timer::getTime() - reference;
        result = delta / 1000000.0;
}
 
string RealTimeInfo::help(const vector<string>& /*tokens*/) const
{
        return "Returns the time in seconds since openMSX was started.";
}
 
 
// SoftwareInfoTopic
 
SoftwareInfoTopic::SoftwareInfoTopic(InfoCommand& openMSXInfoCommand, Reactor& reactor_)
        : InfoTopic(openMSXInfoCommand, "software")
        , reactor(reactor_)
{
}
 
void SoftwareInfoTopic::execute(
        span<const TclObject> tokens, TclObject& result) const
{
        if (tokens.size() != 3) {
                throw CommandException("Wrong number of parameters");
        }
 
        Sha1Sum sha1sum(tokens[2].getString());
        auto& romDatabase = reactor.getSoftwareDatabase();
        const RomInfo* romInfo = romDatabase.fetchRomInfo(sha1sum);
        if (!romInfo) {
                // no match found
                throw CommandException(
                        "Software with sha1sum ", sha1sum.toString(), " not found");
        }
 
        const char* bufStart = romDatabase.getBufferStart();
        result.addDictKeyValues("title",            romInfo->getTitle(bufStart),
                                "year",             romInfo->getYear(bufStart),
                                "company",          romInfo->getCompany(bufStart),
                                "country",          romInfo->getCountry(bufStart),
                                "orig_type",        romInfo->getOrigType(bufStart),
                                "remark",           romInfo->getRemark(bufStart),
                                "original",         romInfo->getOriginal(),
                                "mapper_type_name", RomInfo::romTypeToName(romInfo->getRomType()),
                                "genmsxid",         romInfo->getGenMSXid());
}
 
string SoftwareInfoTopic::help(const vector<string>& /*tokens*/) const
{
        return "Returns information about the software "
               "given its sha1sum, in a paired list.";
}
 
} // namespace openmsx