Hi Patrick!
1) for only reading: check out (open 'lst ...) - when (in) gets a list
instead of a symbol (file) or number (already opened file descriptor),
the list is evaluated like the (call) arguments and within the (in 'lst
..)-expression the input channel is bound to the output channel of the
called executable. Then you can use (from) (till) (line) (char) etc. to
read from it. Same way you can use (out) to call another executable and
write more stuff to its stdin without reading from it.
2) for both reading and writing with the called executable, check out
(pipe), especially the first form (pipe exe) -> fd which returns a file
descriptor. Bind it to a variable like (setq OtherProcess (pipe ...))
and then you can use it it in subsequent calls like (in OtherProcess
..) and (out OtherProcess ...).
Be aware that the PicoLisp text stream functions (from) (till) (line)
(char) etc. always read one additional character, which is placed in a
look-ahead buffer, which can be retrieved with (peek) - depending on how
the called executable handles stdin/stdout it might matter and you could
block reading by accident because of the implicit look-ahead mechanism.
It's not a big issue, but it can matter and then you must be aware of
its workings.
Happy lisping,
Andreas
On 25.04.24 13:03, Patrick Lebas wrote:
How can I get the Stream-out from
(call 'ls) and put it into a string (setq str...) ? THANKS.
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