From: Artur Malabarba <bruce.connor.am@gmail.com>
To: emacs-devel <emacs-devel@gnu.org>
Subject: New assoc-let package
Date: Wed, 3 Dec 2014 23:40:14 +0000 [thread overview]
Message-ID: <CAAdUY-JaSpdeer92jQCSdfs_XAFvh79oK2inJX_1Cv-nZVUVKQ@mail.gmail.com> (raw)
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))
expands to
(let ((.title (cdr (assoc 'title alist)))
(.body (cdr (assoc 'body alist)))
(.site (cdr (assoc 'site alist))))
(if (and .title .body)
.body
.site))
Obviously, this only works for alist elements whose car are symbols,
and it shadows outside variables whose names start with a dot (which
I've never ever run into). Still, this has proven invaluable for
processing the output of `json-read'.
Cheers
Malabarba
next reply other threads:[~2014-12-03 23:40 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 23:40 Artur Malabarba [this message]
2014-12-04 3:54 ` New assoc-let package Stefan Monnier
2014-12-05 0:36 ` Artur Malabarba
2014-12-05 2:49 ` Leo Liu
2014-12-06 2:27 ` Ted Zlatanov
2014-12-04 19:36 ` Ted Zlatanov
2014-12-05 0:33 ` Artur Malabarba
2014-12-05 0:45 ` Ted Zlatanov
2014-12-05 20:27 ` Artur Malabarba
2014-12-05 20:28 ` Artur Malabarba
2014-12-06 11:36 ` Christopher Schmidt
2014-12-06 19:24 ` Artur Malabarba
2014-12-06 19:58 ` Christopher Schmidt
2014-12-07 16:25 ` Ted Zlatanov
2014-12-06 2:42 ` Ted Zlatanov
2014-12-06 4:55 ` Stefan Monnier
2014-12-08 10:56 ` Ted Zlatanov
2014-12-08 12:11 ` Artur Malabarba
2014-12-08 14:01 ` Ted Zlatanov
2014-12-08 15:01 ` Stefan Monnier
2014-12-08 14:59 ` Stefan Monnier
2014-12-08 15:35 ` Ted Zlatanov
2014-12-08 15:56 ` Stefan Monnier
2014-12-08 18:23 ` Artur Malabarba
2014-12-08 18:28 ` Artur Malabarba
2014-12-08 20:07 ` Stefan Monnier
2014-12-09 3:37 ` Artur Malabarba
2014-12-09 16:57 ` Stefan Monnier
2014-12-10 15:20 ` Ted Zlatanov
2014-12-10 15:43 ` Stefan Monnier
2014-12-10 15:49 ` Ted Zlatanov
2014-12-10 18:28 ` Artur Malabarba
2014-12-10 19:00 ` Ted Zlatanov
2014-12-10 19:09 ` Stefan Monnier
2014-12-10 19:14 ` Ted Zlatanov
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