CommandConsole.cc

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#include "CommandConsole.hh"
#include "CommandException.hh"
#include "GlobalCommandController.hh"
#include "Completer.hh"
#include "Interpreter.hh"
#include "Keys.hh"
#include "FileContext.hh"
#include "FileException.hh"
#include "FileOperations.hh"
#include "CliComm.hh"
#include "Event.hh"
#include "Display.hh"
#include "VideoSystem.hh"
#include "EventDistributor.hh"
#include "Version.hh"
#include "unreachable.hh"
#include "utf8_unchecked.hh"
#include "StringOp.hh"
#include "ScopedAssign.hh"
#include "view.hh"
#include "xrange.hh"
#include <algorithm>
#include <fstream>
#include <cassert>
 
using std::string;
using std::string_view;
 
namespace openmsx {
 
// class ConsoleLine
 
ConsoleLine::ConsoleLine(string line_, uint32_t rgb)
        : line(std::move(line_))
        , chunks(1, {rgb, 0})
{
}
 
void ConsoleLine::addChunk(string_view text, uint32_t rgb)
{
        chunks.emplace_back(Chunk{rgb, line.size()});
        line.append(text.data(), text.size());
}
 
size_t ConsoleLine::numChars() const
{
        return utf8::unchecked::size(line);
}
 
uint32_t ConsoleLine::chunkColor(size_t i) const
{
        assert(i < chunks.size());
        return chunks[i].rgb;
}
 
string_view ConsoleLine::chunkText(size_t i) const
{
        assert(i < chunks.size());
        auto pos = chunks[i].pos;
        auto len = ((i + 1) == chunks.size())
                 ? string_view::npos
                 : chunks[i + 1].pos - pos;
        return string_view(line).substr(pos, len);
}
 
// class CommandConsole
 
constexpr const char* const PROMPT_NEW  = "> ";
constexpr const char* const PROMPT_CONT = "| ";
constexpr const char* const PROMPT_BUSY = "*busy*";
 
CommandConsole::CommandConsole(
                GlobalCommandController& commandController_,
                EventDistributor& eventDistributor_,
                Display& display_)
        : commandController(commandController_)
        , eventDistributor(eventDistributor_)
        , display(display_)
        , consoleSetting(
                commandController, "console",
                "turns console display on/off", false, Setting::DONT_SAVE)
        , historySizeSetting(
                commandController, "console_history_size",
                "amount of commands kept in console history", 100, 0, 10000)
        , removeDoublesSetting(
                commandController, "console_remove_doubles",
                "don't add the command to history if it's the same as the previous one",
                true)
        , history(std::max(1, historySizeSetting.getInt()))
        , executingCommand(false)
{
        resetScrollBack();
        prompt = PROMPT_NEW;
        newLineConsole(prompt);
        loadHistory();
        putPrompt();
        Completer::setOutput(this);
 
        const auto& fullVersion = Version::full();
        print(fullVersion);
        print(string(fullVersion.size(), '-'));
        print("\n"
              "General information about openMSX is available at "
              "http://openmsx.org.\n"
              "\n"
              "Type 'help' to see a list of available commands "
              "(use <PgUp>/<PgDn> to scroll).\n"
              "Or read the Console Command Reference in the manual.\n"
              "\n");
 
        commandController.getInterpreter().setOutput(this);
        eventDistributor.registerEventListener(
                EventType::KEY_DOWN, *this, EventDistributor::CONSOLE);
        // also listen to KEY_UP events, so that we can consume them
        eventDistributor.registerEventListener(
                EventType::KEY_UP, *this, EventDistributor::CONSOLE);
}
 
CommandConsole::~CommandConsole()
{
        eventDistributor.unregisterEventListener(EventType::KEY_DOWN, *this);
        eventDistributor.unregisterEventListener(EventType::KEY_UP, *this);
        commandController.getInterpreter().setOutput(nullptr);
        Completer::setOutput(nullptr);
}
 
void CommandConsole::saveHistory()
{
        try {
                std::ofstream outputfile;
                FileOperations::openofstream(outputfile,
                        userFileContext("console").resolveCreate("history.txt"));
                if (!outputfile) {
                        throw FileException(
                                "Error while saving the console history.");
                }
                for (auto& s : history) {
                        outputfile << s << '\n';
                }
        } catch (FileException& e) {
                commandController.getCliComm().printWarning(e.getMessage());
        }
}
 
void CommandConsole::loadHistory()
{
        try {
                std::ifstream inputfile(
                        userFileContext("console").
                                resolveCreate("history.txt").c_str());
                string line;
                while (inputfile) {
                        getline(inputfile, line);
                        putCommandHistory(line);
                }
        } catch (FileException&) {
                // Error while loading the console history, ignore
        }
}
 
gl::ivec2 CommandConsole::getCursorPosition() const
{
        int xPosition = cursorPosition % getColumns();
        auto num = lines[0].numChars() / getColumns();
        int yPosition = unsigned(num - (cursorPosition / getColumns()));
        return {xPosition, yPosition};
}
 
int CommandConsole::signalEvent(const Event& event) noexcept
{
        if (!consoleSetting.getBoolean()) return 0;
 
        // If the console is open then don't pass the event to the MSX
        // (whetever the (keyboard) event is). If the event has a meaning for
        // the console, then also don't pass the event to the hotkey system.
        // For example PgUp, PgDown are keys that have both a meaning in the
        // console and are used by standard key bindings.
        return visit(overloaded{
                [&](const KeyDownEvent& keyEvent) {
                        if (!executingCommand) {
                                if (handleEvent(keyEvent)) {
                                        // event was used
                                        display.repaintDelayed(40000); // 25fps
                                        return EventDistributor::HOTKEY; // block HOTKEY and MSX
                                }
                        } else {
                                // For commands that take a long time to execute (e.g.
                                // a loadstate that needs to create a filepool index),
                                // we also send events during the execution (so that
                                // we can show progress on the OSD). In that case
                                // ignore extra input events.
                        }
                        return EventDistributor::MSX;
                },
                [](const KeyUpEvent&) { return EventDistributor::MSX; },
                [](const EventBase&) { UNREACHABLE; return EventDistributor::MSX; }
        }, event);
}
 
bool CommandConsole::handleEvent(const KeyEvent& keyEvent)
{
        auto keyCode = keyEvent.getKeyCode();
        int key = keyCode &  Keys::K_MASK;
        int mod = keyCode & ~Keys::K_MASK;
 
        switch (mod) {
        case Keys::KM_CTRL:
                switch (key) {
                case Keys::K_H:
                        backspace();
                        return true;
                case Keys::K_A:
                        cursorPosition = unsigned(prompt.size());
                        return true;
                case Keys::K_E:
                        cursorPosition = unsigned(lines[0].numChars());
                        return true;
                case Keys::K_C:
                        clearCommand();
                        return true;
                case Keys::K_L:
                        clearHistory();
                        return true;
#ifndef __APPLE__
                case Keys::K_V:
                        paste();
                        return true;
#endif
                }
                break;
        case Keys::KM_SHIFT:
                switch (key) {
                case Keys::K_PAGEUP:
                        scroll(std::max<int>(getRows() - 1, 1));
                        return true;
                case Keys::K_PAGEDOWN:
                        scroll(-std::max<int>(getRows() - 1, 1));
                        return true;
                }
                break;
        case Keys::KM_META:
#ifdef __APPLE__
                switch (key) {
                case Keys::K_V:
                        paste();
                        return true;
                case Keys::K_K:
                        clearHistory();
                        return true;
                case Keys::K_LEFT:
                        cursorPosition = unsigned(prompt.size());
                        return true;
                case Keys::K_RIGHT:
                        cursorPosition = unsigned(lines[0].numChars());
                        return true;
                }
#endif
                break;
        case Keys::KM_ALT:
                switch (key) {
                case Keys::K_BACKSPACE:
                        deleteToStartOfWord();
                        return true;
#ifdef __APPLE__
                case Keys::K_DELETE:
                        deleteToEndOfWord();
                        return true;
#else
                case Keys::K_D:
                        deleteToEndOfWord();
                        return true;
#endif
                case Keys::K_LEFT:
                        gotoStartOfWord();
                        return true;
                case Keys::K_RIGHT:
                        gotoEndOfWord();
                        return true;
                }
                break;
        case 0: // no modifier
                switch (key) {
                case Keys::K_PAGEUP:
                        scroll(1);
                        return true;
                case Keys::K_PAGEDOWN:
                        scroll(-1);
                        return true;
                case Keys::K_UP:
                        prevCommand();
                        return true;
                case Keys::K_DOWN:
                        nextCommand();
                        return true;
                case Keys::K_BACKSPACE:
                        backspace();
                        return true;
                case Keys::K_DELETE:
                        delete_key();
                        return true;
                case Keys::K_TAB:
                        tabCompletion();
                        return true;
                case Keys::K_RETURN:
                case Keys::K_KP_ENTER:
                        commandExecute();
                        cursorPosition = unsigned(prompt.size());
                        return true;
                case Keys::K_LEFT:
                        if (cursorPosition > prompt.size()) {
                                --cursorPosition;
                        }
                        return true;
                case Keys::K_RIGHT:
                        if (cursorPosition < lines[0].numChars()) {
                                ++cursorPosition;
                        }
                        return true;
                case Keys::K_HOME:
#ifdef __APPLE__
                        scroll(lines.size());
#else
                        cursorPosition = unsigned(prompt.size());
#endif
                        return true;
                case Keys::K_END:
#ifdef __APPLE__
                        scroll(-lines.size());
#else
                        cursorPosition = unsigned(lines[0].numChars());
#endif
                        return true;
                }
                break;
        }
 
        auto unicode = keyEvent.getUnicode();
        if (!unicode || (mod & Keys::KM_META)) {
                // Disallow META modifer for 'normal' key presses because on
                // MacOSX Cmd+L is used as a hotkey to toggle the console.
                // Hopefully there are no systems that require META to type
                // normal keys. However there _are_ systems that require the
                // following modifiers, some examples:
                //  MODE:     to type '1-9' on a N900
                //  ALT:      to type | [ ] on a azerty keyboard layout
                //  CTRL+ALT: to type '#' on a spanish keyboard layout (windows)
                //
                // Event was not used by the console, allow the other
                // subsystems to process it. E.g. F10, or Cmd+L to close the
                // console.
                return false;
        }
 
        // Apparently on macOS keyboard events for keys like F1 have a non-zero
        // unicode field. This confuses the console code (it thinks it's a
        // printable character) and it prevents those keys from triggering
        // hotkey bindings. See this bug report:
        //   https://github.com/openMSX/openMSX/issues/1095
        // As a workaround we ignore chars in the 'Private Use Area' (PUA).
        //   https://en.wikipedia.org/wiki/Private_Use_Areas
        if (utf8::is_pua(unicode)) {
                return false;
        }
 
        if (unicode >= 0x20) {
                normalKey(unicode);
        } else {
                // Skip CTRL-<X> combinations, but still return true.
        }
        return true;
}
 
void CommandConsole::output(string_view text)
{
        print(text);
}
 
unsigned CommandConsole::getOutputColumns() const
{
        return getColumns();
}
 
void CommandConsole::print(string_view text, unsigned rgb)
{
        while (true) {
                auto pos = text.find('\n');
                newLineConsole(ConsoleLine(string(text.substr(0, pos)), rgb));
                if (pos == string_view::npos) return;
                text = text.substr(pos + 1); // skip newline
                if (text.empty()) return;
        }
}
 
void CommandConsole::newLineConsole(string line)
{
        newLineConsole(ConsoleLine(std::move(line)));
}
 
void CommandConsole::newLineConsole(ConsoleLine line)
{
        if (lines.isFull()) {
                lines.removeBack();
        }
        ConsoleLine tmp = std::move(lines[0]);
        lines[0] = std::move(line);
        lines.addFront(std::move(tmp));
}
 
void CommandConsole::putCommandHistory(const string& command)
{
        if (command.empty()) return;
        if (removeDoublesSetting.getBoolean() && !history.empty() &&
            (history.back() == command)) {
                return;
        }
        if (history.full()) history.pop_front();
        history.push_back(command);
}
 
void CommandConsole::commandExecute()
{
        resetScrollBack();
        string cmd0 = lines[0].str().substr(prompt.size());
        putCommandHistory(cmd0);
        saveHistory(); // save at this point already, so that we don't lose history in case of a crash
 
        strAppend(commandBuffer, cmd0, '\n');
        newLineConsole(lines[0]);
        if (commandController.isComplete(commandBuffer)) {
                // Normally the busy prompt is NOT shown (not even very briefly
                // because the screen is not redrawn), though for some commands
                // that potentially take a long time to execute, we explicitly
                // send events, see also comment in signalEvent().
                prompt = PROMPT_BUSY;
                putPrompt();
 
                try {
                        ScopedAssign sa(executingCommand, true);
                        auto resultObj = commandController.executeCommand(
                                commandBuffer);
                        auto result = resultObj.getString();
                        if (!result.empty()) {
                                print(result);
                        }
                } catch (CommandException& e) {
                        print(e.getMessage(), 0xff0000);
                }
                commandBuffer.clear();
                prompt = PROMPT_NEW;
        } else {
                prompt = PROMPT_CONT;
        }
        putPrompt();
}
 
ConsoleLine CommandConsole::highLight(string_view line)
{
        ConsoleLine result;
        result.addChunk(prompt, 0xffffff);
 
        TclParser parser = commandController.getInterpreter().parse(line);
        string colors = parser.getColors();
        assert(colors.size() == line.size());
 
        unsigned pos = 0;
        while (pos != colors.size()) {
                char col = colors[pos];
                unsigned pos2 = pos++;
                while ((pos != colors.size()) && (colors[pos] == col)) {
                        ++pos;
                }
                // TODO make these color configurable?
                unsigned rgb = [&] {
                        switch (col) {
                        case 'E': return 0xff0000; // error
                        case 'c': return 0x5c5cff; // comment
                        case 'v': return 0x00ffff; // variable
                        case 'l': return 0xff00ff; // literal
                        case 'p': return 0xcdcd00; // proc
                        case 'o': return 0x00cdcd; // operator
                        default:  return 0xffffff; // other
                        }
                }();
                result.addChunk(line.substr(pos2, pos - pos2), rgb);
        }
        return result;
}
 
void CommandConsole::putPrompt()
{
        commandScrollBack = unsigned(history.size());
        currentLine.clear();
        lines[0] = highLight(currentLine);
        cursorPosition = unsigned(prompt.size());
}
 
void CommandConsole::tabCompletion()
{
        resetScrollBack();
        auto pl = unsigned(prompt.size());
        string front(utf8::unchecked::substr(lines[0].str(), pl, cursorPosition - pl));
        string back (utf8::unchecked::substr(lines[0].str(), cursorPosition));
        string newFront = commandController.tabCompletion(front);
        cursorPosition = pl + unsigned(utf8::unchecked::size(newFront));
        currentLine = newFront + back;
        lines[0] = highLight(currentLine);
}
 
void CommandConsole::scroll(int delta)
{
        consoleScrollBack = std::max(std::min(consoleScrollBack + delta, int(lines.size()) - int(rows)), 0);
}
 
// Returns the position of the start of the word relative to the current cursor position.
// If the cursor is already located at the start of a word then return the start of the previous word.
// If there is no previous word, then return the start of the line (position of the prompt).
//
// One complication is that the line is utf8 encoded and the positions are
// given in character-counts instead of byte-counts. To solve this this
// function returns a tuple:
//  * an iterator to the start of the word (likely the new cursor position).
//  * an iterator to the current cursor position.
//  * the distance (in characters, not bytes) between these two iterators.
// The first item in this tuple is the actual result. The other two are only
// returned for efficiency (this function calculates them anyway, and it's
// likely the caller will need them as well).
static std::tuple<std::string::const_iterator, std::string::const_iterator, unsigned>
        getStartOfWord(const std::string& line, unsigned cursorPos, size_t promptSize)
{
        auto begin  = std::begin(line);
        auto prompt = begin + promptSize; // assumes prompt only contains single-byte utf8 chars
        auto cursor = begin; utf8::unchecked::advance(cursor, cursorPos);
        auto pos    = cursor;
 
        // search (backwards) for first non-white-space
        unsigned distance = 0;
        while (pos > prompt) {
                auto pos2 = pos;
                utf8::unchecked::prior(pos2);
                if (*pos2 != one_of(' ', '\t')) break;
                pos = pos2;
                ++distance;
        }
        // search (backwards) for first white-space
        while (pos > prompt) {
                auto pos2 = pos;
                utf8::unchecked::prior(pos2);
                if (*pos2 == one_of(' ', '\t')) break;
                pos = pos2;
                ++distance;
        }
        return {pos, cursor, distance};
}
 
// Similar to getStartOfWord() but locates the end of the word instead.
// The end of the word is the 2nd (instead of the 1st) element in the tuple.
// This is done so that both getStartOfWord() and getEndOfWord() have the invariant:
//  result = [begin, end, distance]
//   -> begin <= end
//   -> end - begin == distance
static std::tuple<std::string::const_iterator, std::string::const_iterator, unsigned>
        getEndOfWord(const std::string& line, unsigned cursorPos)
{
        auto begin  = std::begin(line);
        auto end    = std::end  (line);
        auto cursor = begin; utf8::unchecked::advance(cursor, cursorPos);
        auto pos    = cursor;
 
        // search (forwards) for first non-white-space
        unsigned distance = 0;
        while ((pos < end) && (*pos == one_of(' ', '\t'))) {
                ++pos; // single-byte utf8 character
                ++distance;
        }
        // search (forwards) for first white-space
        while ((pos < end) && (*pos != one_of(' ', '\t'))) {
                utf8::unchecked::next(pos);
                ++distance;
        }
        return {cursor, pos, distance};
}
 
void CommandConsole::gotoStartOfWord()
{
        auto [begin, end, distance] = getStartOfWord(lines[0].str(), cursorPosition, prompt.size());
        cursorPosition -= distance;
}
 
void CommandConsole::deleteToStartOfWord()
{
        resetScrollBack();
        currentLine = lines[0].str();
        auto [begin, end, distance] = getStartOfWord(currentLine, cursorPosition, prompt.size());
        currentLine.erase(begin, end);
        currentLine.erase(0, prompt.size());
        lines[0] = highLight(currentLine);
        cursorPosition -= distance;
}
 
void CommandConsole::gotoEndOfWord()
{
        auto [begin, end, distance] = getEndOfWord(lines[0].str(), cursorPosition);
        cursorPosition += distance;
}
 
void CommandConsole::deleteToEndOfWord()
{
        resetScrollBack();
        currentLine = lines[0].str();
        auto [begin, end, distance] = getEndOfWord(currentLine, cursorPosition);
        currentLine.erase(begin, end);
        currentLine.erase(0, prompt.size());
        lines[0] = highLight(currentLine);
}
 
void CommandConsole::prevCommand()
{
        resetScrollBack();
        if (history.empty()) {
                return; // no elements
        }
        bool match = false;
        unsigned tmp = commandScrollBack;
        while ((tmp != 0) && !match) {
                --tmp;
                match = StringOp::startsWith(history[tmp], currentLine);
        }
        if (match) {
                commandScrollBack = tmp;
                lines[0] = highLight(history[commandScrollBack]);
                cursorPosition = unsigned(lines[0].numChars());
        }
}
 
void CommandConsole::nextCommand()
{
        resetScrollBack();
        if (commandScrollBack == history.size()) {
                return; // don't loop !
        }
        bool match = false;
        auto tmp = commandScrollBack;
        while ((++tmp != history.size()) && !match) {
                match = StringOp::startsWith(history[tmp], currentLine);
        }
        if (match) {
                --tmp; // one time to many
                commandScrollBack = tmp;
                lines[0] = highLight(history[commandScrollBack]);
        } else {
                commandScrollBack = unsigned(history.size());
                lines[0] = highLight(currentLine);
        }
        cursorPosition = unsigned(lines[0].numChars());
}
 
void CommandConsole::clearCommand()
{
        resetScrollBack();
        commandBuffer.clear();
        prompt = PROMPT_NEW;
        currentLine.clear();
        lines[0] = highLight(currentLine);
        cursorPosition = unsigned(prompt.size());
}
 
void CommandConsole::clearHistory()
{
        resetScrollBack();
        while (lines.size() > 1) {
                lines.removeBack();
        }
}
 
void CommandConsole::backspace()
{
        resetScrollBack();
        if (cursorPosition > prompt.size()) {
                currentLine = lines[0].str();
                auto b = begin(currentLine);
                utf8::unchecked::advance(b, cursorPosition - 1);
                auto e = b;
                utf8::unchecked::advance(e, 1);
                currentLine.erase(b, e);
                currentLine.erase(0, prompt.size());
                lines[0] = highLight(currentLine);
                --cursorPosition;
        }
}
 
void CommandConsole::delete_key()
{
        resetScrollBack();
        if (lines[0].numChars() > cursorPosition) {
                currentLine = lines[0].str();
                auto b = begin(currentLine);
                utf8::unchecked::advance(b, cursorPosition);
                auto e = b;
                utf8::unchecked::advance(e, 1);
                currentLine.erase(b, e);
                currentLine.erase(0, prompt.size());
                lines[0] = highLight(currentLine);
        }
}
 
void CommandConsole::normalKey(uint32_t chr)
{
        assert(chr);
        resetScrollBack();
        currentLine = lines[0].str();
        auto pos = begin(currentLine);
        utf8::unchecked::advance(pos, cursorPosition);
        utf8::unchecked::append(chr, inserter(currentLine, pos));
        currentLine.erase(0, prompt.size());
        lines[0] = highLight(currentLine);
        ++cursorPosition;
}
 
void CommandConsole::resetScrollBack()
{
        consoleScrollBack = 0;
}
 
static std::vector<std::string_view> splitLines(std::string_view str)
{
        // This differs from StringOp::split() in two ways:
        // - If the input is an empty string, then the resulting vector
        //   contains 1 element which is the empty string (StringOp::split()
        //   would return an empty vector).
        // - If the input ends on a newline character, then the final item in
        //   the result vector is an empty string (StringOp::split() would not
        //   include that last empty string).
        // TODO can we come up with a good name for this function and move it
        //      to StringOp?
        std::vector<std::string_view> result;
        while (true) {
                auto pos = str.find_first_of('\n');
                if (pos == std::string_view::npos) break;
                result.push_back(str.substr(0, pos));
                str = str.substr(pos + 1);
        }
        result.push_back(str);
        return result;
}
 
void CommandConsole::paste()
{
        auto text = display.getVideoSystem().getClipboardText();
        if (text.empty()) return;
        auto pastedLines = splitLines(text);
        assert(!pastedLines.empty());
 
        // helper function 'append()' to append to the existing text
        std::string_view prefix = lines[0].str();
        prefix.remove_prefix(prompt.size());
        auto append = [&](std::string_view suffix) {
                if (prefix.empty()) {
                        lines[0] = highLight(suffix);
                } else {
                        lines[0] = highLight(tmpStrCat(prefix, suffix));
                        prefix = "";
                }
        };
        // execute all but the last line
        for (const auto& line : view::drop_back(pastedLines, 1)) {
                append(line);
                commandExecute();
        }
        // only enter (not execute) the last line
        append(pastedLines.back());
        cursorPosition = unsigned(lines[0].numChars());
}
 
} // namespace openmsx