GNU bug report logs - #6017
23.1.96; savehist-printable for hash tables

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#6017: closed (23.1.96; savehist-printable for hash tables)
Date: Sun, 25 Apr 2010 18:31:02 +0000

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Your message dated Sun, 25 Apr 2010 14:30:35 -0400
with message-id <87bpd78jw4.fsf <at> stupidchicken.com>
and subject line Re: bug#6017: 23.1.96; savehist-printable for hash tables
has caused the GNU bug report #6017,
regarding 23.1.96; savehist-printable for hash tables
to be marked as done.

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help-debbugs <at> gnu.org.)


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From: "Drew Adams" <drew.adams <at> oracle.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 23.1.96; savehist-printable for hash tables
Date: Fri, 23 Apr 2010 10:49:22 -0700

IIUC, starting with Emacs 23.2, we can prin1 and read hash tables. If
that's correct, then `savehist-printable' could presumably be updated to
add this sexp to the cond: (hash-table-p value). IOW:
 
(defun savehist-printable (value)
  "Return non-nil if VALUE is printable."
  (cond
   ((stringp value))
   ((numberp value))
   ((symbolp value))
   ((hash-table-p value))
   (t
    (with-temp-buffer
      (condition-case nil
   (let ((print-readably t) (print-level nil))
   (prin1 value (current-buffer))
   (read (point-min-marker))
   t)
 (error nil))))))

In GNU Emacs 23.1.96.1 (i386-mingw-nt5.1.2600)
 of 2010-04-20 on G41R2F1
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags -Ic:/xpm/include'
 

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: "Drew Adams" <drew.adams <at> oracle.com>
Cc: 6017-done <at> debbugs.gnu.org, 'Stefan Monnier' <monnier <at> IRO.UMontreal.CA>
Subject: Re: bug#6017: 23.1.96; savehist-printable for hash tables
Date: Sun, 25 Apr 2010 14:30:35 -0400

"Drew Adams" <drew.adams <at> oracle.com> writes:

> Is this feature of hash-table print+read support specified anywhere,
> so we know what the support really is? If not, could you please
> document it?

See `Creating Hash Tables' in the Lisp manual.

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