CommandLineParser.cc

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#include "CommandLineParser.hh"
#include "GlobalCommandController.hh"
#include "Interpreter.hh"
#include "SettingsConfig.hh"
#include "File.hh"
#include "FileContext.hh"
#include "FileOperations.hh"
#include "GlobalCliComm.hh"
#include "StdioMessages.hh"
#include "Version.hh"
#include "CliConnection.hh"
#include "ConfigException.hh"
#include "FileException.hh"
#include "EnumSetting.hh"
#include "XMLException.hh"
#include "StringOp.hh"
#include "xrange.hh"
#include "Reactor.hh"
#include "RomInfo.hh"
#include "hash_map.hh"
#include "one_of.hh"
#include "outer.hh"
#include "ranges.hh"
#include "stl.hh"
#include "view.hh"
#include "xxhash.hh"
#include "build-info.hh"
#include <cassert>
#include <iostream>
#include <memory>
 
using std::cout;
using std::string;
using std::string_view;
 
namespace openmsx {
 
// class CommandLineParser
 
CommandLineParser::CommandLineParser(Reactor& reactor_)
        : reactor(reactor_)
        , msxRomCLI(*this)
        , cliExtension(*this)
        , replayCLI(*this)
        , saveStateCLI(*this)
        , cassettePlayerCLI(*this)
#if COMPONENT_LASERDISC
        , laserdiscPlayerCLI(*this)
#endif
        , diskImageCLI(*this)
        , hdImageCLI(*this)
        , cdImageCLI(*this)
{
        registerOption("-h",          helpOption,    PHASE_BEFORE_INIT, 1);
        registerOption("--help",      helpOption,    PHASE_BEFORE_INIT, 1);
        registerOption("-v",          versionOption, PHASE_BEFORE_INIT, 1);
        registerOption("--version",   versionOption, PHASE_BEFORE_INIT, 1);
        registerOption("-bash",       bashOption,    PHASE_BEFORE_INIT, 1);
 
        registerOption("-setting",    settingOption, PHASE_BEFORE_SETTINGS);
        registerOption("-control",    controlOption, PHASE_BEFORE_SETTINGS, 1);
        registerOption("-script",     scriptOption,  PHASE_BEFORE_SETTINGS, 1); // correct phase?
        registerOption("-command",    commandOption, PHASE_BEFORE_SETTINGS, 1); // same phase as -script
        registerOption("-testconfig", testConfigOption, PHASE_BEFORE_SETTINGS, 1);
 
        registerOption("-machine",    machineOption, PHASE_LOAD_MACHINE);
 
        registerFileType(std::array<std::string_view, 1>{"tcl"}, scriptOption);
 
        // At this point all options and file-types must be registered
        ranges::sort(options, {}, &OptionData::name);
        ranges::sort(fileTypes, StringOp::caseless{}, &FileTypeData::extension);
}
 
void CommandLineParser::registerOption(
        const char* str, CLIOption& cliOption, ParsePhase phase, unsigned length)
{
        options.emplace_back(str, &cliOption, phase, length);
}
 
void CommandLineParser::registerFileType(
        std::span<const string_view> extensions, CLIFileType& cliFileType)
{
        append(fileTypes, view::transform(extensions,
                [&](auto& ext) { return FileTypeData{ext, &cliFileType}; }));
}
 
bool CommandLineParser::parseOption(
        const string& arg, std::span<string>& cmdLine, ParsePhase phase)
{
        if (auto o = binary_find(options, arg, {}, &OptionData::name)) {
                // parse option
                if (o->phase <= phase) {
                        try {
                                o->option->parseOption(arg, cmdLine);
                                return true;
                        } catch (MSXException& e) {
                                throw FatalError(std::move(e).getMessage());
                        }
                }
        }
        return false; // unknown
}
 
bool CommandLineParser::parseFileName(const string& arg, std::span<string>& cmdLine)
{
        if (auto* handler = getFileTypeHandlerForFileName(arg)) {
                try {
                        // parse filetype
                        handler->parseFileType(arg, cmdLine);
                        return true; // file processed
                } catch (MSXException& e) {
                        throw FatalError(std::move(e).getMessage());
                }
        }
        return false;
}
 
CLIFileType* CommandLineParser::getFileTypeHandlerForFileName(string_view filename) const
{
        auto inner = [&](string_view arg) -> CLIFileType* {
                string_view extension = FileOperations::getExtension(arg); // includes leading '.' (if any)
                if (extension.size() <= 1) {
                        return nullptr; // no extension -> no handler
                }
                extension.remove_prefix(1);
 
                auto f = binary_find(fileTypes, extension, StringOp::caseless{},
                                     &FileTypeData::extension);
                return f ? f->fileType : nullptr;
        };
 
        // First try the fileName as we get it from the command line. This may
        // be more interesting than the original fileName of a (g)zipped file:
        // in case of an OMR file for instance, we want to select on the
        // original extension, and not on the extension inside the (g)zipped
        // file.
        auto* result = inner(filename);
        if (!result) {
                try {
                        File file(userFileContext().resolve(filename));
                        result = inner(file.getOriginalName());
                } catch (FileException&) {
                        // ignore
                }
        }
        return result;
}
 
void CommandLineParser::parse(std::span<char*> argv)
{
        parseStatus = RUN;
 
        auto cmdLineBuf = to_vector(view::transform(view::drop(argv, 1), [](const char* a) {
                return FileOperations::getConventionalPath(a);
        }));
        std::span<string> cmdLine(cmdLineBuf);
        std::vector<string> backupCmdLine;
 
        for (ParsePhase phase = PHASE_BEFORE_INIT;
             (phase <= PHASE_LAST) && (parseStatus != EXIT);
             phase = static_cast<ParsePhase>(phase + 1)) {
                switch (phase) {
                case PHASE_INIT:
                        reactor.init();
                        fileTypeCategoryInfo.emplace(
                                reactor.getOpenMSXInfoCommand(), *this);
                        getInterpreter().init(argv[0]);
                        break;
                case PHASE_LOAD_SETTINGS:
                        // after -control and -setting has been parsed
                        if (parseStatus != CONTROL) {
                                // if there already is a XML-StdioConnection, we
                                // can't also show plain messages on stdout
                                auto& cliComm = reactor.getGlobalCliComm();
                                cliComm.addListener(std::make_unique<StdioMessages>());
                        }
                        if (!haveSettings) {
                                auto& settingsConfig =
                                        reactor.getGlobalCommandController().getSettingsConfig();
                                // Load default settings file in case the user
                                // didn't specify one.
                                const auto& context = systemFileContext();
                                string filename = "settings.xml";
                                try {
                                        settingsConfig.loadSetting(context, filename);
                                } catch (XMLException& e) {
                                        reactor.getCliComm().printWarning(
                                                "Loading of settings failed: ",
                                                e.getMessage(), "\n"
                                                "Reverting to default settings.");
                                } catch (FileException&) {
                                        // settings.xml not found
                                } catch (ConfigException& e) {
                                        throw FatalError("Error in default settings: ",
                                                         e.getMessage());
                                }
                                // Consider an attempt to load the settings good enough.
                                haveSettings = true;
                                // Even if parsing failed, use this file for saving,
                                // this forces overwriting a non-setting file.
                                settingsConfig.setSaveFilename(context, filename);
                        }
                        break;
                case PHASE_DEFAULT_MACHINE: {
                        if (!haveConfig) {
                                // load default config file in case the user didn't specify one
                                const auto& machine =
                                        reactor.getMachineSetting().getString();
                                try {
                                        reactor.switchMachine(string(machine));
                                } catch (MSXException& e) {
                                        reactor.getCliComm().printInfo(
                                                "Failed to initialize default machine: ",
                                                e.getMessage());
                                        // Default machine is broken; fall back to C-BIOS config.
                                        auto fallbackMachine = std::string(
                                                reactor.getMachineSetting().getDefaultValue().getString());
                                        reactor.getCliComm().printInfo(
                                                "Using fallback machine: ", fallbackMachine);
                                        try {
                                                reactor.switchMachine(fallbackMachine);
                                        } catch (MSXException& e2) {
                                                // Fallback machine failed as well; we're out of options.
                                                throw FatalError(std::move(e2).getMessage());
                                        }
                                }
                                haveConfig = true;
                        }
                        break;
                }
                default:
                        // iterate over all arguments
                        while (!cmdLine.empty()) {
                                string arg = std::move(cmdLine.front());
                                cmdLine = cmdLine.subspan(1);
                                // first try options
                                if (!parseOption(arg, cmdLine, phase)) {
                                        // next try the registered filetypes (xml)
                                        if ((phase != PHASE_LAST) ||
                                            !parseFileName(arg, cmdLine)) {
                                                // no option or known file
                                                backupCmdLine.push_back(arg);
                                                if (auto o = binary_find(options, arg, {}, &OptionData::name)) {
                                                        for (unsigned i = 0; i < o->length - 1; ++i) {
                                                                if (cmdLine.empty()) break;
                                                                backupCmdLine.push_back(std::move(cmdLine.front()));
                                                                cmdLine = cmdLine.subspan(1);
                                                        }
                                                }
                                        }
                                }
                        }
                        std::swap(backupCmdLine, cmdLineBuf);
                        backupCmdLine.clear();
                        cmdLine = cmdLineBuf;
                        break;
                }
        }
        for (const auto& option : options) {
                option.option->parseDone();
        }
        if (!cmdLine.empty() && (parseStatus != EXIT)) {
                throw FatalError(
                        "Error parsing command line: ", cmdLine.front(), "\n"
                        "Use \"openmsx -h\" to see a list of available options");
        }
}
 
CommandLineParser::ParseStatus CommandLineParser::getParseStatus() const
{
        assert(parseStatus != UNPARSED);
        return parseStatus;
}
 
MSXMotherBoard* CommandLineParser::getMotherBoard() const
{
        return reactor.getMotherBoard();
}
 
GlobalCommandController& CommandLineParser::getGlobalCommandController() const
{
        return reactor.getGlobalCommandController();
}
 
Interpreter& CommandLineParser::getInterpreter() const
{
        return reactor.getInterpreter();
}
 
 
// Control option
 
void CommandLineParser::ControlOption::parseOption(
        const string& option, std::span<string>& cmdLine)
{
        const auto& fullType = getArgument(option, cmdLine);
        auto [type, arguments] = StringOp::splitOnFirst(fullType, ':');
 
        auto& parser = OUTER(CommandLineParser, controlOption);
        auto& controller  = parser.getGlobalCommandController();
        auto& distributor = parser.reactor.getEventDistributor();
        auto& cliComm     = parser.reactor.getGlobalCliComm();
        std::unique_ptr<CliListener> connection;
        if (type == "stdio") {
                connection = std::make_unique<StdioConnection>(
                        controller, distributor);
#ifdef _WIN32
        } else if (type == "pipe") {
                connection = std::make_unique<PipeConnection>(
                        controller, distributor, arguments);
#endif
        } else {
                throw FatalError("Unknown control type: '", type, '\'');
        }
        cliComm.addListener(std::move(connection));
 
        parser.parseStatus = CommandLineParser::CONTROL;
}
 
string_view CommandLineParser::ControlOption::optionHelp() const
{
        return "Enable external control of openMSX process";
}
 
 
// Script option
 
void CommandLineParser::ScriptOption::parseOption(
        const string& option, std::span<string>& cmdLine)
{
        parseFileType(getArgument(option, cmdLine), cmdLine);
}
 
string_view CommandLineParser::ScriptOption::optionHelp() const
{
        return "Run extra startup script";
}
 
void CommandLineParser::ScriptOption::parseFileType(
        const string& filename, std::span<std::string>& /*cmdLine*/)
{
        scripts.push_back(filename);
}
 
string_view CommandLineParser::ScriptOption::fileTypeHelp() const
{
        return "Extra Tcl script to run at startup";
}
 
string_view CommandLineParser::ScriptOption::fileTypeCategoryName() const
{
        return "script";
}
 
 
// Command option
void CommandLineParser::CommandOption::parseOption(
        const std::string& option, std::span<std::string>& cmdLine)
{
        commands.push_back(getArgument(option, cmdLine));
}
 
std::string_view CommandLineParser::CommandOption::optionHelp() const
{
        return "Run Tcl command at startup (see also -script)";
}
 
 
// Help option
 
static string formatSet(std::span<const string_view> inputSet, string::size_type columns)
{
        string outString;
        string::size_type totalLength = 0; // ignore the starting spaces for now
        for (const auto& temp : inputSet) {
                if (totalLength == 0) {
                        // first element ?
                        strAppend(outString, "    ", temp);
                        totalLength = temp.size();
                } else {
                        outString += ", ";
                        if ((totalLength + temp.size()) > columns) {
                                strAppend(outString, "\n    ", temp);
                                totalLength = temp.size();
                        } else {
                                strAppend(outString, temp);
                                totalLength += 2 + temp.size();
                        }
                }
        }
        if (totalLength < columns) {
                outString.append(columns - totalLength, ' ');
        }
        return outString;
}
 
static string formatHelpText(string_view helpText,
                             unsigned maxLength, unsigned indent)
{
        string outText;
        string_view::size_type index = 0;
        while (helpText.substr(index).size() > maxLength) {
                auto pos = helpText.substr(index, maxLength).rfind(' ');
                if (pos == string_view::npos) {
                        pos = helpText.substr(maxLength).find(' ');
                        if (pos == string_view::npos) {
                                pos = helpText.substr(index).size();
                        }
                }
                strAppend(outText, helpText.substr(index, index + pos), '\n',
                          spaces(indent));
                index = pos + 1;
        }
        strAppend(outText, helpText.substr(index));
        return outText;
}
 
// items grouped per common help-text
using GroupedItems = hash_map<string_view, std::vector<string_view>, XXHasher>;
static void printItemMap(const GroupedItems& itemMap)
{
        auto printSet = to_vector(view::transform(itemMap, [](auto& p) {
                return strCat(formatSet(p.second, 15), ' ',
                              formatHelpText(p.first, 50, 20));
        }));
        ranges::sort(printSet);
        for (const auto& s : printSet) {
                cout << s << '\n';
        }
}
 
 
// class HelpOption
 
void CommandLineParser::HelpOption::parseOption(
        const string& /*option*/, std::span<string>& /*cmdLine*/)
{
        auto& parser = OUTER(CommandLineParser, helpOption);
        const auto& fullVersion = Version::full();
        cout << fullVersion << '\n'
             << string(fullVersion.size(), '=') << "\n"
                "\n"
                "usage: openmsx [arguments]\n"
                "  an argument is either an option or a filename\n"
                "\n"
                "  this is the list of supported options:\n";
 
        GroupedItems itemMap;
        for (const auto& option : parser.options) {
                const auto& helpText = option.option->optionHelp();
                if (!helpText.empty()) {
                        itemMap[helpText].push_back(option.name);
                }
        }
        printItemMap(itemMap);
 
        cout << "\n"
                "  this is the list of supported file types:\n";
 
        itemMap.clear();
        for (const auto& [extension, fileType] : parser.fileTypes) {
                itemMap[fileType->fileTypeHelp()].push_back(extension);
        }
        printItemMap(itemMap);
 
        parser.parseStatus = CommandLineParser::EXIT;
}
 
string_view CommandLineParser::HelpOption::optionHelp() const
{
        return "Shows this text";
}
 
 
// class VersionOption
 
void CommandLineParser::VersionOption::parseOption(
        const string& /*option*/, std::span<string>& /*cmdLine*/)
{
        cout << Version::full() << "\n"
                "flavour: " << BUILD_FLAVOUR << "\n"
                "components: " << BUILD_COMPONENTS << '\n';
        auto& parser = OUTER(CommandLineParser, versionOption);
        parser.parseStatus = CommandLineParser::EXIT;
}
 
string_view CommandLineParser::VersionOption::optionHelp() const
{
        return "Prints openMSX version and exits";
}
 
 
// Machine option
 
void CommandLineParser::MachineOption::parseOption(
        const string& option, std::span<string>& cmdLine)
{
        auto& parser = OUTER(CommandLineParser, machineOption);
        if (parser.haveConfig) {
                throw FatalError("Only one machine option allowed");
        }
        try {
                parser.reactor.switchMachine(getArgument(option, cmdLine));
        } catch (MSXException& e) {
                throw FatalError(std::move(e).getMessage());
        }
        parser.haveConfig = true;
}
 
string_view CommandLineParser::MachineOption::optionHelp() const
{
        return "Use machine specified in argument";
}
 
 
// class SettingOption
 
void CommandLineParser::SettingOption::parseOption(
        const string& option, std::span<string>& cmdLine)
{
        auto& parser = OUTER(CommandLineParser, settingOption);
        if (parser.haveSettings) {
                throw FatalError("Only one setting option allowed");
        }
        try {
                auto& settingsConfig = parser.reactor.getGlobalCommandController().getSettingsConfig();
                settingsConfig.loadSetting(
                        currentDirFileContext(), getArgument(option, cmdLine));
                parser.haveSettings = true;
        } catch (FileException& e) {
                throw FatalError(std::move(e).getMessage());
        } catch (ConfigException& e) {
                throw FatalError(std::move(e).getMessage());
        }
}
 
string_view CommandLineParser::SettingOption::optionHelp() const
{
        return "Load an alternative settings file";
}
 
 
// class TestConfigOption
 
void CommandLineParser::TestConfigOption::parseOption(
        const string& /*option*/, std::span<string>& /*cmdLine*/)
{
        auto& parser = OUTER(CommandLineParser, testConfigOption);
        parser.parseStatus = CommandLineParser::TEST;
}
 
string_view CommandLineParser::TestConfigOption::optionHelp() const
{
        return "Test if the specified config works and exit";
}
 
// class BashOption
 
void CommandLineParser::BashOption::parseOption(
        const string& /*option*/, std::span<string>& cmdLine)
{
        auto& parser = OUTER(CommandLineParser, bashOption);
        string_view last = cmdLine.empty() ? string_view{} : cmdLine.front();
        cmdLine = cmdLine.subspan(0, 0); // eat all remaining parameters
 
        if (last == "-machine") {
                for (const auto& s : Reactor::getHwConfigs("machines")) {
                        cout << s << '\n';
                }
        } else if (last.starts_with("-ext")) {
                for (const auto& s : Reactor::getHwConfigs("extensions")) {
                        cout << s << '\n';
                }
        } else if (last == "-romtype") {
                for (const auto& s : RomInfo::getAllRomTypes()) {
                        cout << s << '\n';
                }
        } else {
                for (const auto& option : parser.options) {
                        cout << option.name << '\n';
                }
        }
        parser.parseStatus = CommandLineParser::EXIT;
}
 
string_view CommandLineParser::BashOption::optionHelp() const
{
        return {}; // don't include this option in --help
}
 
// class FileTypeCategoryInfoTopic
 
CommandLineParser::FileTypeCategoryInfoTopic::FileTypeCategoryInfoTopic(
                InfoCommand& openMSXInfoCommand, const CommandLineParser& parser_)
        : InfoTopic(openMSXInfoCommand, "file_type_category")
        , parser(parser_)
{
}
 
void CommandLineParser::FileTypeCategoryInfoTopic::execute(
        std::span<const TclObject> tokens, TclObject& result) const
{
        checkNumArgs(tokens, 3, "filename");
        assert(tokens.size() == 3);
 
        // get the category and add it to result
        std::string_view fileName = tokens[2].getString();
        if (const auto* handler = parser.getFileTypeHandlerForFileName(fileName)) {
                result.addListElement(handler->fileTypeCategoryName());
        } else {
                result.addListElement("unknown");
        }
}
 
string CommandLineParser::FileTypeCategoryInfoTopic::help(std::span<const TclObject> /*tokens*/) const
{
        return "Returns the file type category for the given file.";
}
 
} // namespace openmsx