Re: How to read an integer from the minibuffer

[Emanuel Berg]

Gregory Heytings wrote:

>> I'd like to read an integer (or something else e.g.
>> matching a regex) from a minibuffer. Basically, I'm after
>> a version of `read-string', but either allowing only some
>> characters, or accepting only input matching some regex
>> (possibly both).
>>
>> How do I do that? One way would be to use
>> `read-from-minibuffer' with a suitable keymap, but that
>> seems slightly low-level. If that is the way to go, is
>> there a good way to set up a keymap so that nothing except
>> some specified characters are self-inserting? IOW, is
>> `suppress-keymap' the way to go or is there some other way?
>>
>
> Another way:
>
> (defun restricted-read-from-minibuffer (prompt regexp)
>   "Read a string matching REGEXP from the minibuffer, prompting with PROMPT."
>   (let ((s nil))
>     (while (progn
>            (setq s (read-from-minibuffer prompt))
>            (unless (string-match regexp s)
>              (message "Unexpected input.")
>              (sit-for 1)
>              t)))
>     s))

Cool (honestly). But do show how to use that to read an
integer and only an integer ...

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