* How do you record output of both STDERR and STDIN to a string?
@ 2020-09-10 1:14 Bonface M. K.
2020-09-10 15:04 ` Roel Janssen
0 siblings, 1 reply; 4+ messages in thread
From: Bonface M. K. @ 2020-09-10 1:14 UTC (permalink / raw)
To: guile-user
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Hi all. Is there a way to "record" the output from both *stderr* and
*stdout* from a guile process if you wrap it around a "system" call to a
string? Here's something that works. It's not /exactly/ what I want
because "open-input-pipe" runs the command in a subprocess.
--8<---------------cut here---------------start------------->8---
(define (run-job job)
(let* ((port (open-input-pipe job))
(str (read-line port)))
(close-pipe port)
str))
(display (format #t "~s ~s ~s"
"padding"
(run-job "echo hello")
"testing"))
--8<---------------cut here---------------end--------------->8---
I've tried out creating a fork:
--8<---------------cut here---------------start------------->8---
(define (run-job thunk)
(call-with-output-string
(λ (port)
(match (pipe)
((in . out)
(match (primitive-fork)
(0 ; child
(close in)
(with-error-to-port out thunk))
((= waitpid (pid . exit-code)) ;; parent
(close out)
(display (read-line in) port))))))))
;; Doesn't work:
(display (format #t "~s ~s ~s"
"padding"
(run-job (system "echo hello"))
"testing"))
--8<---------------cut here---------------end--------------->8---
Ideally for a correct output without errors, I'd like to have as output:
--8<---------------cut here---------------start------------->8---
"padding" "hello" "testing"
--8<---------------cut here---------------end--------------->8---
and in the event I have an error, like say, by running (system "echoooo hello"), I get
the output:
--8<---------------cut here---------------start------------->8---
"padding" "sh: command not found" "testing""
--8<---------------cut here---------------end--------------->8---
PS: I'm new to Guile :)
--
Bonface M. K. (https://www.bonfacemunyoki.com)
One Divine Emacs To Rule Them All
GPG key = D4F09EB110177E03C28E2FE1F5BBAE1E0392253F
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How do you record output of both STDERR and STDIN to a string?
2020-09-10 1:14 How do you record output of both STDERR and STDIN to a string? Bonface M. K.
@ 2020-09-10 15:04 ` Roel Janssen
2020-09-10 17:48 ` Dr. Arne Babenhauserheide
2020-09-10 17:50 ` Bonface M. K.
0 siblings, 2 replies; 4+ messages in thread
From: Roel Janssen @ 2020-09-10 15:04 UTC (permalink / raw)
To: Bonface M. K., guile-user
On Thu, 2020-09-10 at 04:14 +0300, Bonface M. K. wrote:
> Hi all. Is there a way to "record" the output from both *stderr* and
> *stdout* from a guile process if you wrap it around a "system" call
> to a
> string? Here's something that works. It's not /exactly/ what I want
> because "open-input-pipe" runs the command in a subprocess.
>
> --8<---------------cut here---------------start------------->8---
> (define (run-job job)
> (let* ((port (open-input-pipe job))
> (str (read-line port)))
> (close-pipe port)
> str))
>
> (display (format #t "~s ~s ~s"
> "padding"
> (run-job "echo hello")
> "testing"))
> --8<---------------cut here---------------end--------------->8---
>
> I've tried out creating a fork:
>
> --8<---------------cut here---------------start------------->8---
> (define (run-job thunk)
> (call-with-output-string
> (λ (port)
> (match (pipe)
> ((in . out)
> (match (primitive-fork)
> (0 ; child
> (close in)
> (with-error-to-port out thunk))
> ((= waitpid (pid . exit-code)) ;; parent
> (close out)
> (display (read-line in) port))))))))
>
> ;; Doesn't work:
> (display (format #t "~s ~s ~s"
> "padding"
> (run-job (system "echo hello"))
> "testing"))
> --8<---------------cut here---------------end--------------->8---
>
> Ideally for a correct output without errors, I'd like to have as
> output:
>
> --8<---------------cut here---------------start------------->8---
> "padding" "hello" "testing"
> --8<---------------cut here---------------end--------------->8---
>
> and in the event I have an error, like say, by running (system
> "echoooo hello"), I get
> the output:
>
> --8<---------------cut here---------------start------------->8---
> "padding" "sh: command not found" "testing""
> --8<---------------cut here---------------end--------------->8---
>
> PS: I'm new to Guile :)
>
Having spent a day on this myself, this is the best I had come up with:
--8<---------------cut here---------------start------------->8---
(define (virtuoso-isql-query query)
"Executes QUERY via ISQL and returns a both an ERROR-PORT and a PORT
to read CSV output from."
(let* ((tmp (getenv "TMPDIR"))
(error-port (mkstemp! (string-append (if tmp tmp "/tmp") "/sg-
XXXXXX")))
(port (open-input-pipe
(format #f "~a ~a -U ~a -P ~a verbose=off
csv_rfc4180=on csv_rfc4180_field_separator=, exec='~:a' 2> ~a"
(isql-bin) (isql-port) (rdf-store-
username)
(rdf-store-password)
(string-append "SPARQL " query)
(port-filename error-port)))))
(setvbuf port 'block 4096)
(values error-port port)))
--8<---------------cut here---------------end--------------->8---
I certainly hope someone can come up with a better solution!
Kind regards,
Roel Janssen
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How do you record output of both STDERR and STDIN to a string?
2020-09-10 15:04 ` Roel Janssen
@ 2020-09-10 17:48 ` Dr. Arne Babenhauserheide
2020-09-10 17:50 ` Bonface M. K.
1 sibling, 0 replies; 4+ messages in thread
From: Dr. Arne Babenhauserheide @ 2020-09-10 17:48 UTC (permalink / raw)
To: Roel Janssen; +Cc: guile-user, Bonface M. K.
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Roel Janssen <roel@gnu.org> writes:
> On Thu, 2020-09-10 at 04:14 +0300, Bonface M. K. wrote:
>> Hi all. Is there a way to "record" the output from both *stderr* and
>> *stdout* from a guile process if you wrap it around a "system" call
>> to a
>> string? Here's something that works. It's not /exactly/ what I want
>> because "open-input-pipe" runs the command in a subprocess.
>>
>> --8<---------------cut here---------------start------------->8---
>> (define (run-job job)
>> (let* ((port (open-input-pipe job))
>> (str (read-line port)))
>> (close-pipe port)
>> str))
>>
>> (display (format #t "~s ~s ~s"
>> "padding"
>> (run-job "echo hello")
>> "testing"))
>> --8<---------------cut here---------------end--------------->8---
>>
>> I've tried out creating a fork:
>>
>> --8<---------------cut here---------------start------------->8---
>> (define (run-job thunk)
>> (call-with-output-string
>> (λ (port)
>> (match (pipe)
>> ((in . out)
>> (match (primitive-fork)
>> (0 ; child
>> (close in)
>> (with-error-to-port out thunk))
>> ((= waitpid (pid . exit-code)) ;; parent
>> (close out)
>> (display (read-line in) port))))))))
>>
>> ;; Doesn't work:
>> (display (format #t "~s ~s ~s"
>> "padding"
>> (run-job (system "echo hello"))
>> "testing"))
>> --8<---------------cut here---------------end--------------->8---
>>
>> Ideally for a correct output without errors, I'd like to have as
>> output:
>>
>> --8<---------------cut here---------------start------------->8---
>> "padding" "hello" "testing"
>> --8<---------------cut here---------------end--------------->8---
>>
>> and in the event I have an error, like say, by running (system
>> "echoooo hello"), I get
>> the output:
>>
>> --8<---------------cut here---------------start------------->8---
>> "padding" "sh: command not found" "testing""
>> --8<---------------cut here---------------end--------------->8---
>>
>> PS: I'm new to Guile :)
>>
>
> Having spent a day on this myself, this is the best I had come up with:
>
> --8<---------------cut here---------------start------------->8---
> (define (virtuoso-isql-query query)
> "Executes QUERY via ISQL and returns a both an ERROR-PORT and a PORT
> to read CSV output from."
> (let* ((tmp (getenv "TMPDIR"))
> (error-port (mkstemp! (string-append (if tmp tmp "/tmp") "/sg-
> XXXXXX")))
> (port (open-input-pipe
> (format #f "~a ~a -U ~a -P ~a verbose=off
> csv_rfc4180=on csv_rfc4180_field_separator=, exec='~:a' 2> ~a"
> (isql-bin) (isql-port) (rdf-store-
> username)
> (rdf-store-password)
> (string-append "SPARQL " query)
> (port-filename error-port)))))
> (setvbuf port 'block 4096)
> (values error-port port)))
> --8<---------------cut here---------------end--------------->8---
> I certainly hope someone can come up with a better solution!
I’m not sure whether it’s better, but this is the solution I found:
(import (ice-9 rdelim) (ice-9 popen) (rnrs io ports))
(define (call-command-with-output-error-to-string cmd)
(let* ((err-cons (pipe))
(port (with-error-to-port (cdr err-cons)
(λ() (open-input-pipe cmd))))
(_ (setvbuf (car err-cons) 'block
(* 1024 1024 16)))
(result (read-delimited "" port)))
(close-port (cdr err-cons))
(values
result
(read-delimited "" (car err-cons)))))
(call-command-with-output-error-to-string "echo 1; echo 2 >&2")
Also available on my website:
https://www.draketo.de/software/guile-capture-stdout-stderr.html
Best wishes,
Arne
--
Unpolitisch sein
heißt politisch sein
ohne es zu merken
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How do you record output of both STDERR and STDIN to a string?
2020-09-10 15:04 ` Roel Janssen
2020-09-10 17:48 ` Dr. Arne Babenhauserheide
@ 2020-09-10 17:50 ` Bonface M. K.
1 sibling, 0 replies; 4+ messages in thread
From: Bonface M. K. @ 2020-09-10 17:50 UTC (permalink / raw)
To: Roel Janssen; +Cc: guile-user
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Hi!
Roel Janssen <roel@gnu.org> writes:
[...]
> Having spent a day on this myself, this is the best I had come up with:
>
> (define (virtuoso-isql-query query)
> "Executes QUERY via ISQL and returns a both an ERROR-PORT and a PORT
> to read CSV output from."
> (let* ((tmp (getenv "TMPDIR"))
> (error-port (mkstemp! (string-append (if tmp tmp "/tmp") "/sg-
> XXXXXX")))
> (port (open-input-pipe
> (format #f "~a ~a -U ~a -P ~a verbose=off
> csv_rfc4180=on csv_rfc4180_field_separator=, exec='~:a' 2> ~a"
> (isql-bin) (isql-port) (rdf-store-
> username)
> (rdf-store-password)
> (string-append "SPARQL " query)
> (port-filename error-port)))))
> (setvbuf port 'block 4096)
> (values error-port port)))
>
> I certainly hope someone can come up with a better solution!
>
Thanks. If I don't find anything, I'll give it a shot :)
> Kind regards,
> Roel Janssen
>
>
>
>
>
--
Bonface M. K. (https://www.bonfacemunyoki.com)
One Divine Emacs To Rule Them All
GPG key = D4F09EB110177E03C28E2FE1F5BBAE1E0392253F
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2020-09-10 1:14 How do you record output of both STDERR and STDIN to a string? Bonface M. K.
2020-09-10 15:04 ` Roel Janssen
2020-09-10 17:48 ` Dr. Arne Babenhauserheide
2020-09-10 17:50 ` Bonface M. K.
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