Re: Temporary changing the behavior of a function

[Marcin Borkowski <mbork@mbork.pl>]

On 2015-11-06, at 14:03, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

>> Now I want to call `foo' in the Mafia-mode;-), i.e., it should ask no
>> further questions.  What do I do?  AFAIU, `cl-flet' won't help, since it
>> is lexical.  The best I can think of is to temporarily advice `bar' with
>> :override - but then, instead of a `let'-like, local construct, I have
>> to explicitly add and then remove the advice, right?
>
>    (defvar my-bar-is-silent nil)
>    (defun my-bar-silencer (orig &rest args)
>      (if my-bar-is-silent <dosomethinggrommit> (apply orig args)))
>    (advice-add 'bar :around #'my-bar-silencer)
>
> and then
>
>    ... (let ((my-bar-is-silent t))
>          (foo ...))

Thanks!  Of course, I can see some performance penalty, but since it is
an interactive command, this doesn't bother me at all.

> -- Stefan

Best,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University