cube-game-plus-plus/server/commands/CommandEditor.cpp

#include <readline/readline.h>
#include <readline/history.h>
#include <poll.h>
#include <unistd.h>

#include "server/commands/CommandEditor.h"

std::mutex CommandEditor::queueMutex;
RingBuffer<String, 5> CommandEditor::queue;

CommandEditor::CommandEditor() : running(true), readThread(&CommandEditor::loop, this) {
    rl_bind_key('\t', rl_insert);
}

CommandEditor::~CommandEditor() {
    running = false;
    readThread.join();
    rl_callback_handler_remove();
    rl_clear_visible_line();
}

void CommandEditor::preTick() const {
    rl_clear_visible_line();
}

void CommandEditor::postTick() const {
    rl_forced_update_display();
}

bool CommandEditor::hasCommand() const {
    return queue.canRead();
}

String CommandEditor::readCommand() {
    std::lock_guard<std::mutex> lg(queueMutex);
    return queue.read();
}

void CommandEditor::onLineRead(char* line) {
    std::lock_guard<std::mutex> lg(queueMutex);
    add_history(line);
    queue.write(line);
    free(line);
}

void CommandEditor::loop() {
    rl_callback_handler_install("> ", onLineRead);
    rl_set_keyboard_input_timeout(1);
    while(running) {
        struct pollfd fds;
        fds.fd = STDIN_FILENO;
        fds.events = POLLIN;
        fds.revents = 0;
        int result = poll(&fds, 1, 1);
        if(result > 0) {
            rl_callback_read_char();
        }
    }
    rl_callback_handler_remove();
}