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From: Zelphir Kaltstahl <zelphirkaltstahl@posteo.de>
To: guile-user@gnu.org
Subject: Re: Shell commands with output to string
Date: Tue, 22 Feb 2022 09:38:35 +0000	[thread overview]
Message-ID: <1280eba0-81c0-6e7b-d512-bbd1f83a409c@posteo.de> (raw)
In-Reply-To: <e6859100-a234-37b9-c677-3e72f36f0578@posteo.de>

Corrections below.

On 2/22/22 10:29, Zelphir Kaltstahl wrote:
> Hello Guile users!
>
> How would I run a shell command from inside Guile and get its output as a 
> string, instead of the output being outputted directly? (Guile 3.0.8)
>
> So far I have found
>
> ~~~~
> (system ...)
> ~~~~
>
> which I tried to use with
>
> ~~~~
> scheme@(guile-user)> (with-output-to-string
>   (system "ls -al"))
>
> ;; lots of output immediately shown and not stored in variable
>
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> Wrong type to apply: 0
>
> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
> scheme@(guile-user) [1]> ,bt
> In ice-9/ports.scm:
>     476:4  2 (with-output-to-string 0)
> While executing meta-command:
> In procedure frame-local-ref: Argument 2 out of range: 1
> ~~~~
>
> But this does not give me a string back.
>
> I also tried with
>
> ~~~~
> scheme@(guile-user)> (call-with-values (lambda () (system "ls -al"))
> ... (lambda (exit-code output) output))
>
> ;; lots of output immediately shown
>
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> Wrong number of values returned to continuation (expected 2)
>
> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
>
> scheme@(guile-user) [1]> ,bt
> In current input:
>     10:29  1 (_)
> In ice-9/boot-9.scm:
>   1685:16  0 (raise-exception _ #:continuable? _)
> ~~~~
>
> Is there another function I should be using?
>
> I would like to have the exit code and the output of a command.
>
> Best regards,
> Zelphir

Of course I should use `with-output-to-string` correctly:

~~~~
scheme@(guile-user)> (with-output-to-string
   (lambda () (system "ls -al")))
;; directly outputted stuff
$1 = ""
~~~~

But still not a win.

Regards,
Zelphir

-- 
repositories: https://notabug.org/ZelphirKaltstahl	




  reply	other threads:[~2022-02-22  9:38 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-22  9:29 Shell commands with output to string Zelphir Kaltstahl
2022-02-22  9:38 ` Zelphir Kaltstahl [this message]
2022-02-22 10:20   ` Alex Sassmannshausen
2022-02-22 10:43     ` post
2022-02-23 14:01       ` Josselin Poiret
2022-03-08 23:12         ` Zelphir Kaltstahl
2022-03-09 14:14           ` Josselin Poiret
2022-02-22 11:20     ` Neil Jerram
2022-02-23  1:28       ` Zelphir Kaltstahl
2022-02-23  1:29     ` Zelphir Kaltstahl
2022-02-22 10:21   ` tomas
2022-02-22 14:27 ` Olivier Dion via General Guile related discussions
2022-02-22 16:00   ` Leo Butler
2022-02-22 16:33     ` Olivier Dion via General Guile related discussions
2022-02-23  1:26       ` Zelphir Kaltstahl
2022-02-23 14:13         ` Olivier Dion via General Guile related discussions
2022-02-26  0:32           ` Zelphir Kaltstahl
  -- strict thread matches above, loose matches on Subject: below --
2022-02-23 17:48 Blake Shaw
2022-02-23 18:25 ` Olivier Dion via General Guile related discussions

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