How to get single keystroke in D2 (Phobos)?

Question

Is there a simple, cross-platform way to get a single keystroke in D2 using Phobos?

For instance, a \"Press any key to continue...\" prompt, or a Brainfuck interpre

Answer 1

The simplest solution that works with D2 on Windows:

import std.stdio : writefln;

extern(C) int kbhit();
extern(C) int getch();

void main()
{
    while(!kbhit())
    {
        // keep polling
        // might use Thread.Sleep here to avoid taxing the cpu.
    }

    writefln("Key hit was %s.", cast(char)getch());
}

It might even work with D1, but I haven't tried it out.

Here's a Linux version, modified from Walter's post:

import std.stdio : writefln;
import std.c.stdio;
import std.c.linux.termios;

extern(C) void cfmakeraw(termios *termios_p);

void main() 
{
    termios  ostate;                 /* saved tty state */
    termios  nstate;                 /* values for editor mode */

       // Open stdin in raw mode
       /* Adjust output channel        */
    tcgetattr(1, &ostate);                       /* save old state */
    tcgetattr(1, &nstate);                       /* get base of new state */
    cfmakeraw(&nstate);
    tcsetattr(1, TCSADRAIN, &nstate);      /* set mode */

      // Read characters in raw mode
    writefln("The key hit is %s", cast(char)fgetc(stdin));

       // Close
    tcsetattr(1, TCSADRAIN, &ostate);       // return to original mode
}