Re: Temporary changing the behavior of a function

[Michael Heerdegen <michael_heerdegen@web.de>]

Marcin Borkowski <mbork@mbork.pl> writes:

> so there is this function `foo', which calls the function `bar'.  The
> function `bar' is responsible for asking the user for some value and
> passing that value to the guts of `foo'.
>
> 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?

Apart from what already had been suggested, there are two more dirty
alternatives:

 - Use `cl-letf' to create dynamical bindings on the place
 (symbol-function 'SYMBOL), instead of using `cl-flet'.  A common trick
 in such situations.

 - If `bar' asks always the same questions, you can push your "answers"
 to `unread-command-events'.  Just a workaround, but can save you from
 advising at all.


Michael.