[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: a GUIX_PACKAGE_PATH / modules puzzle
From: |
Nils Gillmann |
Subject: |
Re: a GUIX_PACKAGE_PATH / modules puzzle |
Date: |
Thu, 3 May 2018 08:30:33 +0000 |
Chris Marusich transcribed 2.3K bytes:
> Nils Gillmann <address@hidden> writes:
>
> > Anyways, in which section of the guile Manual would I find "pk"? I've
> > done surprisingly little debugging with Guile itself so far.
>
> Unfortunately, pk isn't (yet?) documented. It apparently stands for
> "peek stuff". It prints and returns the value passed to it. It's a
> useful little shortcut for printing values.
Okay, thanks.
> Here are some simple
> examples of how to use it:
>
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> (pk "hello")
>
> ;;; ("hello")
> $1 = "hello"
> scheme@(guile-user)> (pk (list 1 2 3))
>
> ;;; ((1 2 3))
> $2 = (1 2 3)
> scheme@(guile-user)> (define (1+ n) (+ 1 (pk n)))
> scheme@(guile-user)> (1+ 2)
>
> ;;; (2)
> $3 = 3
> scheme@(guile-user)> pk
> $4 = #<procedure peek stuff>
> --8<---------------cut here---------------end--------------->8---
>
> Note that pk does not print out all values when a procedure returns
> multiple values, but it is still quite handy:
>
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> (pk (values 1 2))
>
> ;;; (1)
> $5 = 1
> --8<---------------cut here---------------end--------------->8---
>
> I hope that helps!
Seems like in the case of using (system) it doesn't do anything, I'll
try guile interaction with Guix tonight.
> By the way, if you feel like taking a trip down the rabbit hole, here is
> the answer to the somewhat unrelated question of "why did pk only print
> the first value?"
>
> https://lists.gnu.org/archive/html/guile-user/2017-06/msg00043.html
>
> --
> Chris
signature.asc
Description: PGP signature
- a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/01
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Chris Marusich, 2018/05/03
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/03
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Chris Marusich, 2018/05/03
- Re: a GUIX_PACKAGE_PATH / modules puzzle,
Nils Gillmann <=
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/10
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/10
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/11
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/11
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Ricardo Wurmus, 2018/05/12
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/12
- Re: a GUIX_PACKAGE_PATH / modules puzzle, Ricardo Wurmus, 2018/05/13
Re: a GUIX_PACKAGE_PATH / modules puzzle, Nils Gillmann, 2018/05/11