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Re: Preparing for a new release

From: zimoun
Subject: Re: Preparing for a new release
Date: Tue, 11 Feb 2020 00:43:12 +0100


On Mon, 10 Feb 2020 at 22:28, Ricardo Wurmus <address@hidden> wrote:

> > Right?
> That’s correct, but to directly access values in the “inputs” field,
> though, you’d have to use a let binding around the definition of the
> code snippet, which would be uglier.
> So ugly in fact that I decided to write this little procedure:

Wow! :-)

> --8<---------------cut here---------------start------------->8---
> ;; Simplify access to tagged items in lists.
> (define pick


>         ;; SRFI-1 accessors like "first"
>         ((procedure? n)
>          (n sub))


>         (else (error "pick: Selector not supported.")))))))
> --8<---------------cut here---------------end--------------->8---
> Then I noticed that it’s really inconvenient to use let bindings inside
> of fields, so I changed the “make-process” macro to allow for
> definitions inside of the fields of a process.

Ok. Even I am a bit lost with all the changes.

> So you can do this now:
> --8<---------------cut here---------------start------------->8---
> process foo
>   inputs
>     . "something"
>     . samples: "a" "b" "c"
>   procedure
>     define second-sample
>       pick second samples: inputs
>     . # { echo {{second-sample}} }
> --8<---------------cut here---------------end--------------->8---
> Unfortunately, the leading dot sticks out like a wart here.  We could
> only drop it if I manage to rewrite the code-snippet value so that it
> really is a procedure that will return itself when applied to zero
> arguments…  It might be possible with some tinkering.

Hum? I trust you.

> (Note that you do need the “procedure” field name here; it can be left
> off only when the last value is a code-snippet.)

Ok. It makes sense.

Does this work?

 --8<---------------cut here---------------start------------->8---
 process foo
     . "something"
     . samples: "a" "b" "c"
     # { echo {{(pick second inputs:samples)}} }
 --8<---------------cut here---------------end--------------->8---

or   # { echo {{(pick second samples: inputs)}} }

Because it is enough to usual needs, I guess.


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