regading detection of stdin

[Adam D. Ruppe]

Sounds like what you need is to see if stdin is a tty.

import core.sys.posix.unistd; // has isatty()

void main() {
         import std.stdio;
         writeln(isatty(0)); // 0 is stdin, so this will show 1 if 
keyboard or 0 if pope
}