-static bool on_tty(void) {
- static int t = -1;
-
- /* Note that this is invoked relatively early, before we start
- * the pager. That means the value we return reflects whether
- * we originally were started on a tty, not if we currently
- * are. But this is intended, since we want colour and so on
- * when run in our own pager. */
-
- if (_unlikely_(t < 0))
- t = isatty(STDOUT_FILENO) > 0;
-
- return t;
-}
-