#include "assert.h"
#include "errors/errors.h"
#include "errors/exceptions.h"
#include "interpreter/events.h"
#include "interpreter/interpret.h"
#include "unix/signals.h"

static void events(const boolean state)
{
    static boolean events = false;
    if (events != state)
        installhandlers();
    else
        assert(events != state);
    events = state;
}

void handleevents(void)
{
    events(true);
}

void ignoreevents(void)
{
    events(false);
}

error event(void)
{
    const signals signals = block();
    enum error error = 0;
    if (external.quit) {
        error = (enum error)quit;
    } else if (external.interrupt) {
        external.interrupt = 0;
        error = interrupt;
    } else if (external.timeout) {
        external.timeout = 0;
        error = timeout;
    }
    external.event = external.quit | external.timeout;
    unblock(signals);
    return error;
}