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Re: Sweeter Emacs Lisp
From: |
Josh |
Subject: |
Re: Sweeter Emacs Lisp |
Date: |
Sun, 14 Jul 2013 09:18:37 -0700 |
On Sat, Jul 13, 2013 at 7:22 PM, <address@hidden> wrote:
> may be time for Emacs Lisp to evolve and provide similar stuff making
> easier/more-fun to write code in it. Here's a detailed list with
> examples of what I would want to see as part of core Emacs Lisp:
I made a related suggestion recently, see the thread at
http://lists.gnu.org/archive/html/emacs-devel/2013-06/msg01198.html.
> + when-let, if-let:
>
> ;; clojure.core/when-let
> ;; ([bindings & body])
> ;; Macro
> ;; bindings => binding-form test
> ;; When test is true, evaluates body with binding-form bound to the value
> of test
> ;;-------------------------
> ;; clojure.core/if-let
> ;; ([bindings then] [bindings then else & oldform])
> ;; Macro
> ;; bindings => binding-form test
> ;; If test is true, evaluates then with binding-form bound to the value of
> ;; test, if not, yields else
I'm not very familiar with Clojure but these appear to be available
already in the form of two anaphoric macros that ship with Emacs
(`ibuffer-awhen' and `ibuffer-aif'). Unfortunately, being tucked away
as they are in ibuf-macs.el (which is not loaded by default), anyone
looking for this functionality with `apropos' or `info-apropos' would
find nothing and conclude that they did not exist yet, and as a result
needlessly re-implement them herself or drag in another library.
> (let ((pos (re-search-backward "regex" nil t)))
> (when pos
> (list pos (match-string-no-properties 0))))
>
> (when-let ((pos (re-search-backward "regex" nil t)))
> (list pos (match-string-no-properties 0)))
(require 'ibuf-macs)
(ibuffer-awhen (re-search-backward "regex" nil t)
(list it (match-string-no-properties 0)))
Josh
- Re: Sweeter Emacs Lisp, (continued)
Re: Sweeter Emacs Lisp, Miles Bader, 2013/07/15
Re: Sweeter Emacs Lisp,
Josh <=
Re: Sweeter Emacs Lisp, Stefan Monnier, 2013/07/15
Re: Sweeter Emacs Lisp, Stefan Monnier, 2013/07/16