Can an :around advice know the name of the function it is advising?

Can an :around advice know the name of the function it is advising?

[Marcin Borkowski]

Hi all,

I would like to be able for an :around advice to know not only the
"original function" it is supposed to call, but also its /name/.  (Yes,
I now a function need not have /one/ name -- it may have more or less --
but assume that I added the advice to a command having one name in
a usual manner.)  Is it even possible?  (I guess not, but I wanted to
make sure.)

TIA,

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

Re: Can an :around advice know the name of the function it is advising?

[Michael Heerdegen]

Marcin Borkowski <mbork@mbork.pl> writes:

> I would like to be able for an :around advice to know not only the
> "original function" it is supposed to call, but also its /name/.  (Yes,
> I now a function need not have /one/ name -- it may have more or less --
> but assume that I added the advice to a command having one name in
> a usual manner.)  Is it even possible?  (I guess not, but I wanted to
> make sure.)

If you know a name of the function you want to advice, you can make it
known to the piece of advice too, of course ;-) But no, there is no
special mechanism for finding the name of the advised function from
within the advice code AFAIK - apart from looking at the
`backtrace-frame's or other brutal things.

AFAICT the process of installing advises only touches functions, but
doesn't cause changes on the symbol level apart from the functions
fbound to them.

Michael.

Re: Can an :around advice know the name of the function it is advising?

[Michael Heerdegen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> AFAICT the process of installing advises only touches functions, but
> doesn't cause changes on the symbol level apart from the functions
> fbound to them.

Correction: it can change the property list of a symbol.  But that
doesn't help: if you look at the symbol-function of an advised named
function, there is no reference to the name there.

But well, that's not the case for unadvised named functions as well.

Michael.

Re: Can an :around advice know the name of the function it is advising?

[Marcin Borkowski]

On 2016-02-14, at 17:13, Michael Heerdegen <michael_heerdegen@web.de> wrote:

> Marcin Borkowski <mbork@mbork.pl> writes:
>
>> I would like to be able for an :around advice to know not only the
>> "original function" it is supposed to call, but also its /name/.  (Yes,
>> I now a function need not have /one/ name -- it may have more or less --
>> but assume that I added the advice to a command having one name in
>> a usual manner.)  Is it even possible?  (I guess not, but I wanted to
>> make sure.)
>
> If you know a name of the function you want to advice, you can make it
> known to the piece of advice too, of course ;-) But no, there is no

Yes, and as you have seen in my other message (thanks for the answer,
I'll reply later) I went that route.

> special mechanism for finding the name of the advised function from
> within the advice code AFAIK - apart from looking at the
> `backtrace-frame's or other brutal things.
>
> AFAICT the process of installing advises only touches functions, but
> doesn't cause changes on the symbol level apart from the functions
> fbound to them.

Thanks.

> Michael.

Best,

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