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Re: [Chicken-users] Trace facility
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From: |
Alex Shinn |
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Subject: |
Re: [Chicken-users] Trace facility |
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Date: |
Thu, 06 Jan 2005 12:17:57 -0600 |
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User-agent: |
Wanderlust/2.10.1 (Watching The Wheels) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/21.3 (i386-pc-linux-gnu) MULE/5.0 (SAKAKI) |
At Thu, 6 Jan 2005 09:14:56 +0000, Joel Reymont wrote:
>
> > Alex Shinn wrote:
>
> >If using low-level macros then this can also be done with environment
> >variables instead of features.
>
> Thanks! This is exactly what I needed. What do you mean by low-level
> macros and variables, though?
(define-macro (debug . args)
(if (and-let* ((dbg (getenv "CHICKEN_DEBUG")))
(not (string=? dbg "")))
`(fprintf (current-error-port) ,@args)
#t))
This can't be done with syntax-rules, though it could with
syntax-case.
It's a bit of a hack though, the cond-expand solution is cleaner.
--
Alex