* How can function know its own name?
@ 2022-06-25 20:21 Jean Louis
2022-06-25 21:37 ` Emanuel Berg
` (3 more replies)
0 siblings, 4 replies; 13+ messages in thread
From: Jean Louis @ 2022-06-25 20:21 UTC (permalink / raw)
To: Help GNU Emacs
I would like to invoke logging for specific functions automatically,
without specifying what to log, and my function should know which
function invoked it.
For example
(defun my-log (&optional function-name)
(log-to-database function-name))
(defun logged-function ()
(my-log (find-function-name)) ;; I would like at this point to recognize that it was invoked from within logged-function?
(ignore))
Would this be possible somehow?
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-25 20:21 How can function know its own name? Jean Louis
@ 2022-06-25 21:37 ` Emanuel Berg
2022-06-26 5:46 ` tomas
` (2 subsequent siblings)
3 siblings, 0 replies; 13+ messages in thread
From: Emanuel Berg @ 2022-06-25 21:37 UTC (permalink / raw)
To: help-gnu-emacs
Jean Louis wrote:
> I would like to invoke logging for specific functions
> automatically, without specifying what to log, and my
> function should know which function invoked it.
>
> For example
>
> (defun my-log (&optional function-name)
> (log-to-database function-name))
>
> (defun logged-function ()
> (my-log (find-function-name)) ;; I would like at this point
> to recognize that it was invoked from within logged-function?
> (ignore))
>
> Would this be possible somehow?
You can do a function called for example 'log-this-function'.
You send the function you wish to log to that function, it
then does a `advice-add' :before (or :after?) the function
that's supposed to be logged and the advice function can then
have the function's name with `symbol-name' since that's
available in 'log-this-function' ...
--
underground experts united
https://dataswamp.org/~incal
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-25 20:21 How can function know its own name? Jean Louis
2022-06-25 21:37 ` Emanuel Berg
@ 2022-06-26 5:46 ` tomas
2022-06-26 8:08 ` Jean Louis
2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-26 9:43 ` Philip Kaludercic
3 siblings, 1 reply; 13+ messages in thread
From: tomas @ 2022-06-26 5:46 UTC (permalink / raw)
To: Jean Louis; +Cc: Help GNU Emacs
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On Sat, Jun 25, 2022 at 11:21:20PM +0300, Jean Louis wrote:
>
> I would like to invoke logging for specific functions automatically,
> without specifying what to log, and my function should know which
> function invoked it.
This is not completely trivial. In Lisp, a function has no name.
It is a first-class object which can be bound to (the function
slot) of a symbol (or to that of two, three... symbols).
It's like the value 42. Many variables can be bound to that. Or
none.
What name has (lambda (x) (if (= (mod x 2) 1) (+ (* 3 x) 1) (/ x 2)))?
None (yet?).
Try this:
(setf (symbol-function 'foo) (lambda (x) (+ x 1)))
Now:
(foo 13)
=> 14
So that function that adds one to its argument is now arguably
called foo. But:
(setf (symbol-function 'bar) (symbol-function 'foo))
Then:
(bar 14)
=> 15
...it can be called bar at the same time. Well, I can be called
two names too, can't I?
See 13.3 "Naming a function" and 9.1 "Symbol Components" in our
beloved Emacs Lisp manual for all the gory details.
Now to the interesting question: how do debuggers pull it off?
Cheers
--
t
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 5:46 ` tomas
@ 2022-06-26 8:08 ` Jean Louis
0 siblings, 0 replies; 13+ messages in thread
From: Jean Louis @ 2022-06-26 8:08 UTC (permalink / raw)
To: tomas; +Cc: Help GNU Emacs
* tomas@tuxteam.de <tomas@tuxteam.de> [2022-06-26 08:46]:
> On Sat, Jun 25, 2022 at 11:21:20PM +0300, Jean Louis wrote:
> >
> > I would like to invoke logging for specific functions automatically,
> > without specifying what to log, and my function should know which
> > function invoked it.
>
> This is not completely trivial. In Lisp, a function has no name.
> It is a first-class object which can be bound to (the function
> slot) of a symbol (or to that of two, three... symbols).
>
> It's like the value 42. Many variables can be bound to that. Or
> none.
>
> What name has (lambda (x) (if (= (mod x 2) 1) (+ (* 3 x) 1) (/ x 2)))?
>
> None (yet?).
>
> Try this:
>
> (setf (symbol-function 'foo) (lambda (x) (+ x 1)))
>
> Now:
>
> (foo 13)
>
> => 14
>
> So that function that adds one to its argument is now arguably
> called foo. But:
>
> (setf (symbol-function 'bar) (symbol-function 'foo))
>
> Then:
>
> (bar 14)
>
> => 15
>
> ...it can be called bar at the same time. Well, I can be called
> two names too, can't I?
>
> See 13.3 "Naming a function" and 9.1 "Symbol Components" in our
> beloved Emacs Lisp manual for all the gory details.
>
> Now to the interesting question: how do debuggers pull it off?
OK.
Maybe one way to give function a capacity to find out its name, the
name of the called function from inside of itself could be to call it
in a wrapper which sets global variable to be symbol of the function.
(defvar rcd-called-function)
(defun rcd-call-function (function &rest args)
(setq rcd-called-function function)
(apply function args)
(setq rcd-called-function nil))
(defun my-fun ()
(message "My function name is: %s" rcd-called-function))
(rcd-call-function 'my-fun) ⇒ nil
--
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-25 20:21 How can function know its own name? Jean Louis
2022-06-25 21:37 ` Emanuel Berg
2022-06-26 5:46 ` tomas
@ 2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-26 9:25 ` tomas
2022-06-26 10:13 ` Jean Louis
2022-06-26 9:43 ` Philip Kaludercic
3 siblings, 2 replies; 13+ messages in thread
From: Stefan Monnier via Users list for the GNU Emacs text editor @ 2022-06-26 8:54 UTC (permalink / raw)
To: help-gnu-emacs
> I would like to invoke logging for specific functions automatically,
> without specifying what to log, and my function should know which
> function invoked it.
`C-h o trace-function RET`
Stefan
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
@ 2022-06-26 9:25 ` tomas
2022-06-26 10:13 ` Jean Louis
1 sibling, 0 replies; 13+ messages in thread
From: tomas @ 2022-06-26 9:25 UTC (permalink / raw)
To: help-gnu-emacs
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On Sun, Jun 26, 2022 at 04:54:36AM -0400, Stefan Monnier via Users list for the GNU Emacs text editor wrote:
> > I would like to invoke logging for specific functions automatically,
> > without specifying what to log, and my function should know which
> > function invoked it.
>
> `C-h o trace-function RET`
But then you'd have to know already (a) function's name, no?
;-)
Cheers
--
t
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-26 9:25 ` tomas
@ 2022-06-26 10:13 ` Jean Louis
2022-06-26 21:25 ` Stefan Monnier
1 sibling, 1 reply; 13+ messages in thread
From: Jean Louis @ 2022-06-26 10:13 UTC (permalink / raw)
To: Stefan Monnier; +Cc: help-gnu-emacs
* Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2022-06-26 11:56]:
> > I would like to invoke logging for specific functions automatically,
> > without specifying what to log, and my function should know which
> > function invoked it.
>
> `C-h o trace-function RET`
Interactively, that gives information.
Though within function I would not be able to automaticaly read which
function was invoked. If that is what you mean.
--
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 10:13 ` Jean Louis
@ 2022-06-26 21:25 ` Stefan Monnier
2022-06-27 2:35 ` Jean Louis
0 siblings, 1 reply; 13+ messages in thread
From: Stefan Monnier @ 2022-06-26 21:25 UTC (permalink / raw)
To: help-gnu-emacs
> Though within function I would not be able to automaticaly read which
> function was invoked. If that is what you mean.
trace-function does a kind of logging like the one you're trying
to implement.
Stefan
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 21:25 ` Stefan Monnier
@ 2022-06-27 2:35 ` Jean Louis
0 siblings, 0 replies; 13+ messages in thread
From: Jean Louis @ 2022-06-27 2:35 UTC (permalink / raw)
To: Stefan Monnier; +Cc: help-gnu-emacs
* Stefan Monnier <monnier@iro.umontreal.ca> [2022-06-27 00:27]:
> > Though within function I would not be able to automaticaly read which
> > function was invoked. If that is what you mean.
>
> trace-function does a kind of logging like the one you're trying
> to implement.
Thank you.
I track some functions when were they invoked for statistics
purposes.
ID 19552
Date created "2022-06-26 11:34:49.214956"
Date modified nil
User created "maddox"
User modified "maddox"
Account nil
Contact nil
Business nil
Assigned to nil
Time zone nil
Date "2022-06-26 11:34:49.214956"
Time nil
Title "Function `rcd-db-edit-entry'"
Description "Table: activities Column: activities_name ID: 5"
Publish nil
Hyperdocument nil
Key nil
Log type "DB Column"
--
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-25 20:21 How can function know its own name? Jean Louis
` (2 preceding siblings ...)
2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
@ 2022-06-26 9:43 ` Philip Kaludercic
2022-06-26 10:21 ` Jean Louis
2022-06-26 10:31 ` Jean Louis
3 siblings, 2 replies; 13+ messages in thread
From: Philip Kaludercic @ 2022-06-26 9:43 UTC (permalink / raw)
To: Jean Louis; +Cc: Help GNU Emacs
Jean Louis <bugs@gnu.support> writes:
> I would like to invoke logging for specific functions automatically,
> without specifying what to log, and my function should know which
> function invoked it.
>
> For example
>
> (defun my-log (&optional function-name)
> (log-to-database function-name))
>
> (defun logged-function ()
> (my-log (find-function-name)) ;; I would like at this point to recognize that it was invoked from within logged-function?
> (ignore))
>
> Would this be possible somehow?
>
>
> Jean
>
> Take action in Free Software Foundation campaigns:
> https://www.fsf.org/campaigns
>
> In support of Richard M. Stallman
> https://stallmansupport.org/
This might do the job: https://emacs.stackexchange.com/questions/2310/can-functions-access-their-name/2312#2312
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 9:43 ` Philip Kaludercic
@ 2022-06-26 10:21 ` Jean Louis
2022-06-26 10:31 ` Jean Louis
1 sibling, 0 replies; 13+ messages in thread
From: Jean Louis @ 2022-06-26 10:21 UTC (permalink / raw)
To: Philip Kaludercic; +Cc: Help GNU Emacs
> Jean Louis <bugs@gnu.support> writes:
>
> > I would like to invoke logging for specific functions automatically,
> > without specifying what to log, and my function should know which
> > function invoked it.
* Philip Kaludercic <philipk@posteo.net> [2022-06-26 12:44]:
> This might do the job: https://emacs.stackexchange.com/questions/2310/can-functions-access-their-name/2312#2312
That gives me solution in sight, thank you!
--
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 9:43 ` Philip Kaludercic
2022-06-26 10:21 ` Jean Louis
@ 2022-06-26 10:31 ` Jean Louis
2022-06-26 21:13 ` Stefan Monnier via Users list for the GNU Emacs text editor
1 sibling, 1 reply; 13+ messages in thread
From: Jean Louis @ 2022-06-26 10:31 UTC (permalink / raw)
To: Philip Kaludercic; +Cc: Help GNU Emacs
* Philip Kaludercic <philipk@posteo.net> [2022-06-26 12:45]:
> This might do the job: https://emacs.stackexchange.com/questions/2310/can-functions-access-their-name/2312#2312
This way it somehow starts working. Condition is that I have to call
`my-function-name' in the first `let' as otherwise the index would
change.
It is very useful however on my side. I can also get arguments to
function. I will use that for refresh and logging.
(defun my-function-name ()
(cadr (backtrace-frame 5)))
(defun my-aware-function ()
(let ((my-name (my-function-name)))
my-name))
(my-aware-function) ⇒ my-aware-function
--
Jean
Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns
In support of Richard M. Stallman
https://stallmansupport.org/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: How can function know its own name?
2022-06-26 10:31 ` Jean Louis
@ 2022-06-26 21:13 ` Stefan Monnier via Users list for the GNU Emacs text editor
0 siblings, 0 replies; 13+ messages in thread
From: Stefan Monnier via Users list for the GNU Emacs text editor @ 2022-06-26 21:13 UTC (permalink / raw)
To: help-gnu-emacs
> (defun my-function-name ()
> (cadr (backtrace-frame 5)))
The number will need to be different if your code is byte-compiled, or
instrumented for Edebug, or if your function is advised (e.g. which
includes the use of `elp-profile`, `debug-on-entry`, `trace-function`).
Stefan
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2022-06-27 2:35 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-06-25 20:21 How can function know its own name? Jean Louis
2022-06-25 21:37 ` Emanuel Berg
2022-06-26 5:46 ` tomas
2022-06-26 8:08 ` Jean Louis
2022-06-26 8:54 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-26 9:25 ` tomas
2022-06-26 10:13 ` Jean Louis
2022-06-26 21:25 ` Stefan Monnier
2022-06-27 2:35 ` Jean Louis
2022-06-26 9:43 ` Philip Kaludercic
2022-06-26 10:21 ` Jean Louis
2022-06-26 10:31 ` Jean Louis
2022-06-26 21:13 ` Stefan Monnier via Users list for the GNU Emacs text editor
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