bug#44612: Read standard input in `guix repl'

[Christopher Baines <mail@cbaines.net>]

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Pierre Neidhardt <mail@ambrevar.xyz> writes:

> Hey Tobias,
>
> Always good to have someone actually test the stuff :)
>
> Tobias Geerinckx-Rice <me@tobias.gr> writes:
>
>> So far this looks like an (SB)CL(-specific) bug, right?  Does it 
>> happen anywhere else?  I tried Guile[0].
>
> Maybe there was a misunderstanding, it's not about Common Lisp.
> We can do easier than from Guile, i.e. from a shell:
>
> --8<---------------cut here---------------start------------->8---
> echo '(display "hello")' | guix repl
> --8<---------------cut here---------------end--------------->8---
>
> and... it works! O.o
>
> OK, my bad then, I mistested somehow.
>
> For future reference, it's also works in Common Lisp:
>
> --8<---------------cut here---------------start------------->8---
>> (with-input-from-string (s "(display \"foo\\n\")")
>            (uiop:run-program '("guix" "repl") :input s :output t :error-output nil))
> GNU Guile 3.0.4
> Copyright (C) 1995-2020 Free Software Foundation, Inc.
>
> Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
> This program is free software, and you are welcome to redistribute it
> under certain conditions; type `,show c' for details.
>
> Enter `,help' for help.
> foo
>
> --8<---------------cut here---------------end--------------->8---
>
> However this brings me to another issue: the program output is prefixed
> with the REPL welcome message which is printed to stdout.
>
> So ideally when we read from standard input we should not include the
> welcome message.
>
> Any clue how to do that?

I haven't been following along too closely, but I'm surprised guix repl
--type=machine hasn't been mentioned, is that relevant?

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