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Re: [Released] Re: 23.0.50; savehist save invalid syntax
From: |
Stefan Monnier |
Subject: |
Re: [Released] Re: 23.0.50; savehist save invalid syntax |
Date: |
Tue, 11 Sep 2007 17:29:44 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/23.0.50 (gnu/linux) |
>> I think this special case of print-unreadable-function being bound to t is
>> rather unnecessary.
> It seemed to me that without that option, each package that used the
> feature would quickly end up writing the same function:
> (defun package-unreadable-function (obj)
> "Signal that OBJ would be unreadable."
> (error "%S can't be printed readably" obj))
That's OK. We can even provide this function in subr.el so they can replace
(let ((print-unreadable-function t))
with
(let ((print-unreadable-function 'signal-print-unreadable-error))
[ But I do think that signalling `error' would be wrong: it needs to be more
precise. I'm sure you agree with me since that's already what t does
right now in your code IIUC. ]
> (This of course loses the specific error symbol.) I know when I was
> testing it (before it supported t) I immediately felt silly writing a
> function that just redirected to `error'. It seems to me that "print this
I'd personally write
(let ((print-unreadable-function (lambda (obj) (signal 'the-error obj))))
or
(let ((print-unreadable-function (lambda (obj) (throw 'the-error obj))))
and I don't feel silly about it at all.
> Of course, while thinking about this it occurs to me that while (4 5 ...)
> (produced with a finite `print-length' or `print-level') is actually
> readable, it certainly does not read as what was written. Should this
> trigger the unreadable-handling as well?
I'd prefer that setting print-unreadable-function automatically overrides
any print-length or print-level limit.
Stefan
- RE: 23.0.50; savehist save invalid syntax, (continued)
- Re: 23.0.50; savehist save invalid syntax, Richard Stallman, 2007/09/10
- Re: 23.0.50; savehist save invalid syntax, Davis Herring, 2007/09/11
- RE: 23.0.50; savehist save invalid syntax, Davis Herring, 2007/09/10
- RE: 23.0.50; savehist save invalid syntax, Drew Adams, 2007/09/10
- RE: 23.0.50; savehist save invalid syntax, Davis Herring, 2007/09/10
- Re: 23.0.50; savehist save invalid syntax, Stefan Monnier, 2007/09/10
- Re: [Released] Re: 23.0.50; savehist save invalid syntax, Davis Herring, 2007/09/11
- Re: [Released] Re: 23.0.50; savehist save invalid syntax,
Stefan Monnier <=
- Re: [Released] Re: 23.0.50; savehist save invalid syntax, Richard Stallman, 2007/09/14
- RE: 23.0.50; savehist save invalid syntax, Drew Adams, 2007/09/10
- Re: 23.0.50; savehist save invalid syntax, Leo, 2007/09/05