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

[Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@gnu.org>]

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Pierre,

Pierre Neidhardt 写道：
> and... it works! O.o

Don't you hate it when that happens?  Ban bug suicide.

(Does that mean this one can be closed?  Or retitled, if we want 
to debug Nyxt? :-)

> For future reference, it's also works in Common Lisp:
>            (uiop:run-program '("guix" "repl") :input s :output t 
>            :error-output nil))

Well, I stranded trying to import (or whatever the CL term is) 
UIOP itself, but my Common Lisp-fu is hella weak.

> 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.

That's a question for Guile channels, but I totally agree.  It's 
annoying and nowhere near ‘an interactive mode’ as suggested by 
the GPL3.

This is sensible:

  $ echo echo Hi. | bash
  Hi.
  $ 

This is not:

  $ echo '(display "Hi.\n")' | guile
  GNU Guile 3.0.2
  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.
  Hi.
  scheme@(guile-user)> 
  $

> Any clue how to do that?

The following line in my ~/.guile does just that:

  (set! repl-welcome (const #t))

...unfortunately, it doesn't work late:

  $ echo '(use-modules ((system repl common))) \
    (set! repl-welcome (const #t))' | guix repl
  [shouty noises]
  $

It does not appear documented if and how you'd make Guile load a 
different (Nyxt-specific) init file name.

This reminds me: do you want Nyxt to call ‘guix repl -q’ to skip 
loading ~/.guile to make your UI more predictable & debuggable? 
Or keep it as an escape hatch for cool hacks?

Kind regards,

T G-R

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