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Re: Redefining functions and variables
From: |
Andreas Politz |
Subject: |
Re: Redefining functions and variables |
Date: |
Wed, 08 Dec 2010 15:21:25 -0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Elena <egarrulo@gmail.com> writes:
> On 27 Lug, 22:21, Stefan Monnier <monn...@iro.umontreal.ca> wrote:
>> > I wonder whether there is a way to catch such redefinitions whenever
>> > they happen (which also would help when accidentally redefining
>> > something)
>>
>> Not sure what you mean by that.
>
> Let's assume we have two definitions for the same function:
>
> ;; File A (loaded first)
> (defun foo ()
> ...
>
> ;; File B (loaded later)
> (defun foo () ;; This is a redefinition: I'd like to get a warning.
> ...
>
> Since redefining functions is the heart of interactive programming,
> such a warning should be issued only while loading files. That way,
> you could consider whether to rename the second function or to rewrite
> it as an advice (as you suggested).
>
I think `defun' does not take no advice.
> If such a goal can only be achieved by rewriting "defun" and checking
> by means of "fboundp" whether the function has already been defined,
> here is my (failed, as noted) attempt:
>
> (defmacro defun (name args &rest body)
> `(progn
> ;; `load-file-name' is not null only if we are loading a file.
> (when (and load-file-name
> ;; FAIL: I don't know how to quote the value of `name'.
> (fboundp ,name))
(fboundp ',name))
Why not use `quote'.
> (message "Warning: %s is being redefined in %s."
> ;; FAIL: I don't know how to quote the value of `name'.
> (symbol-name ,name)
> load-file-name)
> (defun ,name ,args
Of course this leads to an endless recursive loop, expanding your macro
again and again ...
(funcall (symbol-function 'defun) 'foo nil)
does not seem to work either, which would mean that you can't save
`defun's definition.
>
> ,@body))))
>
> Any suggestions? Thanks.
-ap
- Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables, Stefan Monnier, 2010/12/08
- Re: Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables,
Andreas Politz <=
- Re: Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables, Andreas Politz, 2010/12/08
- Re: Redefining functions and variables, Pascal J. Bourguignon, 2010/12/08
- Re: Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables, Stefan Monnier, 2010/12/08
- Re: Redefining functions and variables, Elena, 2010/12/08
- Re: Redefining functions and variables, Stefan Monnier, 2010/12/08
- Re: Redefining functions and variables, Uday S Reddy, 2010/12/08
- Re: Redefining functions and variables, Andreas Politz, 2010/12/08