NIL :stdin-push ( mixed $ARG , … )

Pushes values to stdin, effectively faking user input.

# :stdin-push example.
:set &A &B i0
:read &A
:stdin-push i69
:read &B

:writeln s'A: ' $A
:writeln s'B: ' $B

If user provides only one value during the first :read call, then the second :read call will assign i69 to &B. However, if user provides more than one value, the second :read call will assign &B properly, as it always takes the first available value from the buffer, whereas :stdin-push places values at end of buffer.