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

["Linus Björnstam" <linus.internet@fastmail.se>]

My macro is was based on the  |> pipeline from f# and on the cut macro. I then changed the syntax after seing the pipeline macro in rackjure, which is based on clojure's macros. In the beginning I wanted to do destructuring as well to allow to destructure lists and passed it as numbered arguments and such. I had a syntax-case version that did all that, but I never used that, so I wrote a syntax-rules macro instead so that I could bring it with me if I ever switched schemes (from chez). I switched to chicken and then guile and brought the macro with me. 

If you want to use it, I also provide a right-inserting macro as well: (~>> ...). The license is more or less "just don't remove this copyright notice from the source", so feel free :D

-- 
  Linus Björnstam

On Tue, 9 Jul 2019, at 11:58, Chris Vine wrote:
> On Tue, 09 Jul 2019 11:40:02 +0200
> Linus Björnstam <linus.internet@fastmail.se> wrote:
> > Sorry, I didn't see that macro. I was referring to my macro that Erik
> > linked to [1], which is a syntax rules macro that also allows for <>
> > argument placeholders:
> > 
> > (~> 1 1+ (/ 10 <>) iota (+ <...>)) => 10
> > 
> > It defaults to left insert, so
> > 
> > (~> 10 (/ 2)) => 5
> > 
> > but also (like the syntax rules macro i posted) also supports functions without parents as you can see in the first example.
> > 
> > That's what I get for trying to.follow the discussion in an unthreaded mobile app :)
> > 
> > [1]: https://bitbucket.org/bjoli/guile-threading-macros/src/default/
> 
> I thought your module/library was impressive.  My little macro (as it
> now turns out, defective in hygiene, although it has served me well for
> some time) was something I use frequently because I like the pipeline
> idiom.  It inserts to the right only, because that is what I am used
> to: it sort-of imitates the reverse application of a partially applied
> curried function.  I think your module is based on clojure macros,
> about which I know little.
>