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From: Liliana Marie Prikler <liliana.prikler@gmail.com>
To: Jean Abou Samra <jean@abou-samra.fr>, guile-devel@gnu.org
Subject: Re: Macro for Python-style debugging output
Date: Wed, 30 Mar 2022 21:08:12 +0200	[thread overview]
Message-ID: <a14bf97b7a90f7d7e76df6cb34cb37ec7a9ff00d.camel@gmail.com> (raw)
In-Reply-To: <8bfae8ae-3965-1fc7-1ab0-d67b1c87a831@abou-samra.fr>

Am Montag, dem 28.03.2022 um 21:22 +0200 schrieb Jean Abou Samra:
> The following macro is a variant of peek that mimics Python's =
> format specifier (e.g. print(f"{a=} {a+b=}")) by printing expressions
> and the values they evaluate to.
> 
> (define-syntax-rule (db arg ...)
>    (begin
>      (let ((evaluated-arg arg))
>        (format (current-error-port) ";;; ~s => ~s\n" (quote arg) 
> evaluated-arg)
>        evaluated-arg)
>      ...))
> 
> Am I reinventing the wheel? Does anyone see value in this
> being added to Guile?
I think using plain old 'peek' might be preferable in most cases. 
While you're missing out on the LHS expression, you can mix it with
symbols arbitrarily, e.g. (peek 'my-function a b 'args+kwargs= rest)

Cheers



  reply	other threads:[~2022-03-30 19:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-28 19:22 Macro for Python-style debugging output Jean Abou Samra
2022-03-30 19:08 ` Liliana Marie Prikler [this message]
2022-03-31  2:38   ` Thien-Thi Nguyen

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