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Re: New assoc-let package

From: Stefan Monnier
Subject: Re: New assoc-let package
Date: Wed, 03 Dec 2014 22:54:50 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

>>>>> "Artur" == Artur Malabarba <address@hidden> writes:

> Hi All,
> As part of another project, which involves excessive handing of
> alists, I wrote up a little macro which has turned out to be
> stupendously useful. I'm just checking whether this functionality is
> already offered somewhere, because if it isn't I'll make an Elpa
> package for it.

> Simply put, the macro takes an alist and a body, and makes the data of
> the alist accessible by just writing the car of the desired cell
> preceded by a dot.
> For instance, the following:

>   (assoc-let alist
>     (if (and .title .body)
>         .body
>       .site))

I don't know of any package that does something like that, no.
The way I'd have done it is

    (cl-macrolet (((a field) `(cdr (assq ,field alist))))
      (if (and (a title) (a body))
          (a body)
        (a site)))

-- Stefan

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