mikoto/source/app.d

import std.stdio;
import core.thread;
import core.stdc.signal;
import core.sys.windows.windows;

__gshared bool hasCancelled;

version(Posix) {
    extern(C) void signalHander(int num) nothrow @nogc @system {
        if(num == SIGINT)
            hasCancelled = true;
    }
}

version(Windows) {
    extern(Windows) BOOL ctrlHandler(DWORD fdwCtrlType) nothrow @nogc @system {
        switch(fdwCtrlType) {
            case CTRL_C_EVENT:
            case CTRL_CLOSE_EVENT:
                hasCancelled = true;
                return TRUE;

            default:
                return FALSE;
        }
    }
}

void main() {
    import std.range : padLeft;
    import std.string : format;

    version(Windows)
        if(!SetConsoleCtrlHandler(&ctrlHandler, TRUE))
            stderr.writeln("Failed to register Windows CTRL handler.");

    version(Posix)
        signal(SIGINT, &signalHander);

    if(hasCancelled) return;

    writeln(r"    __  ____ __         __      ");
    writeln(r"   /  |/  (_) /______  / /_____ ");
    writeln(r"  / /|_/ / / //_/ __ \/ __/ __ \");
    writeln(r" / /  / / / ,< / /_/ / /_/ /_/ /");
    writeln(r"/_/  /_/_/_/|_|\____/\__/\____/ ");

    debug writeln("== %s ========= DEBUG ==".format("aabbccddee"));
    else writeln("v0.0.0".padLeft(' ', 30));

    if(hasCancelled) return;

    for(;;) {
        Thread.sleep(1.seconds);
        if(hasCancelled)
            break;
    }

    writeln("Exiting!");
}