From: John Mastro <john.b.mastro@gmail.com>
To: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
Cc: Oleh Krehel <ohwoeowho@gmail.com>, Kaushal Modi <kaushal.modi@gmail.com>
Subject: Re: Any infrastructure to select one of a few options in Emacs core?
Date: Thu, 19 May 2016 18:16:22 -0700 [thread overview]
Message-ID: <CAOj2CQTpTF_roGwj+xv46=EF+4UG0NedQsdsGyHJ3M_zytZZ5A@mail.gmail.com> (raw)
In-Reply-To: <87mvnlers6.fsf@mbork.pl>
Marcin Borkowski <mbork@mbork.pl> wrote:
> I went with this code:
>
> --8<---------------cut here---------------start------------->8---
> (defun select-choice (message choices)
> "Display a buffer with MESSAGE and then CHOICES.
> Each element of CHOICES should be a cons cell, whose car is the
> result and the cdr is the description. The user may select one
> by pressing a digit."
> ;; TODO: This function is way too simple and not fool-proof!
> (if (> (length choices) 9)
> (error "Too many choices!")
> (save-window-excursion
> (pop-to-buffer " *amsrefs doi selection*" t t)
> (delete-other-windows) ; TODO: this should be fixed
> (erase-buffer)
> (insert message "\n\n")
> (let ((i 0))
> (dolist (choice choices)
> (setq i (1+ i))
> (insert (format "%d. %s\n\n" i (cdr choice)))))
> (let ((key (read-key)))
> (if (<= 49 key 57)
> (car (nth (- key 49) choices))
> (error "Wrong key pressed!"))))))
> --8<---------------cut here---------------end--------------->8---
>
> As it is said in the comment, it is far from ideal, but the whole
> program I've been writing for my friend is one big quick hack, so
> I didn't bother too much.
I've sometimes wanted something like this too.
I played around with a few cosmetic changes to your function and ended
up with this:
(defun read-choice (prompt choices)
(if (> (length choices) 9)
(error "Too many choices (max 9)")
(let ((cursor-in-echo-area t)
(prompt (if (get-text-property 0 'face prompt)
prompt
(propertize prompt
'face
'minibuffer-prompt))))
(save-window-excursion
(pop-to-buffer " *Read choice*" t t)
(setq-local cursor-type nil)
(erase-buffer)
(let ((i 0))
(dolist (choice choices)
(setq i (1+ i))
(insert (propertize (number-to-string i)
'face
'font-lock-variable-name-face)
(format " %s\n" (cdr choice))))
(goto-char (point-min))
(fit-window-to-buffer)
(let ((key (- (read-key prompt) 48)))
(if (<= 1 key i)
(car (nth (1- key) choices))
(user-error "Invalid key"))))))))
Same functionality but posted anyway in the spirit of sharing :)
Why did you find `delete-other-windows' necessary? (Your TODO mentions
that it should be "fixed", so I assume you would have preferred not to
use it.)
John
next prev parent reply other threads:[~2016-05-20 1:16 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 10:09 Any infrastructure to select one of a few options in Emacs core? Marcin Borkowski
2016-05-09 14:13 ` Drew Adams
2016-05-09 15:40 ` Marcin Borkowski
2016-05-09 16:37 ` Kaushal Modi
2016-05-09 17:10 ` Marcin Borkowski
2016-05-09 17:27 ` Drew Adams
2016-05-09 18:08 ` Marcin Borkowski
2016-05-09 18:16 ` Drew Adams
2016-05-19 20:06 ` Marcin Borkowski
2016-05-20 1:16 ` John Mastro [this message]
2016-05-20 23:52 ` John Mastro
2016-05-21 20:48 ` Marcin Borkowski
2016-05-09 18:36 ` Pascal J. Bourguignon
2016-05-14 4:20 ` Emanuel Berg
2016-05-21 20:49 ` Marcin Borkowski
2016-05-14 4:18 ` Emanuel Berg
2016-05-21 20:52 ` Marcin Borkowski
[not found] ` <mailman.43.1463863961.1216.help-gnu-emacs@gnu.org>
2016-05-22 6:32 ` Emanuel Berg
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