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Re: Threading / Pipe Macro (Chris Vine, Mark H Weaver)

From: Linus Björnstam
Subject: Re: Threading / Pipe Macro (Chris Vine, Mark H Weaver)
Date: Tue, 09 Jul 2019 08:04:53 +0200
User-agent: Cyrus-JMAP/3.1.6-731-g19d3b16-fmstable-20190627v1

The comparison is also not really fair. The syntax-rules macro is doing a lot 
more. A simple syntax-rules macro just inserting everything in the leftmost 
position would loo something like

(define-syntax ->
  (syntax-rules ()
    ((-> exp) exp)
    ((-> exp (proc args ...) rest ...) (-> (proc exp args ...) rest ...)
    ((-> exp proc rest ...) (-> (proc exp) rest ...))))

I wrote this here in the mail without testing, so no guarantees that it would 
work. It is simple enough. I think it should work.

  Linus Björnstam

On Tue, 9 Jul 2019, at 01:02, Chris Vine wrote:
> On Mon, 8 Jul 2019 23:10:28 +0200t
> Zelphir Kaltstahl <address@hidden> wrote:
> > Hello Chris and hello Mark,
> > 
> > Thank you both for posting your macros! This is really useful and I am
> > looking forward to using this in the next situation where there would be
> > deep nesting or where it seems appropriate in other ways.
> > 
> > To understand what is going on in the macro, I wrote a lot of explaining
> > comments and uploaded it in a new repository, where I intend to keep
> > macros I come across and explain them, if I can:
> > 
> >
> You are using the wrong macro, because the one you have chosen has been
> revealed to be unhygienic.  Either use the syntax-rules one (which is
> the simplest) or the revised syntax-case macro.

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