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        Mon, 26 Apr 2021 12:02:17 -0700 (PDT)
Date: Mon, 26 Apr 2021 22:01:49 +0300
From: "dmn (graahnul DOT grom AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] system wide config
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On Thu, 22 Apr 2021 12:56:22 +0300
"Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-user AT delorie DOT com]"
<geda-user AT delorie DOT com> wrote:

> On Thu, Apr 22, 2021 at 09:16:32AM +0300, dmn
> (graahnul DOT grom AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> > On Tue, 20 Apr 2021 16:46:34 +0200 (CEST)
> > "karl AT aspodata DOT se [via geda-user AT delorie DOT com]"
> > <geda-user AT delorie DOT com> wrote:
> > 
> > >  I think the following will suit me fine in the future.
> > > 
> > > (use-modules (ice-9 popen))
> > > (use-modules (ice-9 rdelim))
> > > 
> > > (define (readlink file)
> > >   (let*
> > >    (
> > >     (port (open-input-pipe (string-append "readlink -f " file)))
> > >     (str  (read-line port))
> > >     (close-pipe port)
> > >    )
> > >    str
> > >   )
> > > )
> > > 
> > > (define MK (readlink "Makefile"))
> > > (define INC (dirname MK))
> > > (define TOP (dirname INC))
> > > ;(display MK)  (newline)
> > > ;(display INC) (newline)
> > > ;(display TOP) (newline)
> > > 
> > >  Thanks for the ideas and help.
> > > 
> > > Regards,
> > > /Karl Hammar
> > > 
> > 
> > Karl, first of all, I'd like to thank you for not using the "dog's
> > breakfast coding style" (TM)! :-)
> > Being not an expert in the bloody lisp programming language, I
> > wonder does the call "(close-pipe port)" inside the "let" clause
> > get executed? (It looks like a variable definition).
> 
> It's easy to check, use REPL and something like
> 
> (format #t "Closed? ~A\n" (port-closed? port))
> 
> before resulting 'str'.


Thank you, I've tried that. Indeed, in the above context
close-pipe is treated just as a local variable,
no call to close-pipe().


Regards,
Dmitry.

-- 
Lepton Electronic Design Automation
https://github.com/lepton-eda/lepton-eda
https://graahnul-grom.github.io