GNU bug report logs - #3375
23.0.94; Document incompatible change to format of bookmarks

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: "Drew Adams" <drew.adams <at> oracle.com>
Subject: bug#3375 closed by Karl Fogel <kfogel <at> red-bean.com> (Fix
 "Document incompatible change to format of bookmarks")
Date: Fri, 09 Oct 2009 05:35:06 +0000

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#3375: 23.0.94; Document incompatible change to format of bookmarks

It has been closed by Karl Fogel <kfogel <at> red-bean.com>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Karl Fogel <kfogel <at> red-bean.com> by
replying to this email.


-- 
3375: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3375
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Karl Fogel <kfogel <at> red-bean.com>
To: 3375-close <at> debbugs.gnu.org
Subject: Fix "Document incompatible change to format of bookmarks"
Date: Fri, 09 Oct 2009 01:30:30 -0400

fixed
--

Thanks for the report.  I've documented the format change in NEWS;
here's the commit:

  $ cvs ci -F msg etc/NEWS etc/ChangeLog
  /sources/emacs/emacs/etc/NEWS,v  <--  etc/NEWS
  new revision: 1.2100; previous revision: 1.2099
  /sources/emacs/emacs/etc/ChangeLog,v  <--  etc/ChangeLog
  new revision: 1.812; previous revision: 1.811
  Mailing notification to emacs-diffs <at> gnu.org... sent.
  $ 

(I don't know why the default write-out format was changed, as I didn't
commit rev 1.114 of bookmark.el.  We could investigate and find out, but
it would be of forensic interest only at this point -- the change is
made, and there's a long list of bookmark.el bugs to go.  So I'm not
going to investigate the reasoning behind 1.114 closely; if you happen
to find out, please let me know.)

-Karl

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From: "Drew Adams" <drew.adams <at> oracle.com>
To: <emacs-pretest-bug <at> gnu.org>
Subject: 23.0.94; Document incompatible change to format of bookmarks
Date: Mon, 25 May 2009 12:50:40 -0700

Emacs 23 apparently introduces an incompatible change to the format of
bookmarks. A bookmark that formerly would have had this form:
("Directories"
  ((front-context-string . "\n22.8 File Direc")
   (rear-context-string . ": > Directories\n")
   (position . 133657)
   (filename . "c:/Emacs-23-0-3/info/emacs")
   (info-node . "Directories")
   (handler . Info-bookmark-jump)))
 
Now can have this form:
("Directories"
  (front-context-string . "\n22.8 File Direc")
  (rear-context-string . ": > Directories\n")
  (position . 133657)
  (filename . "c:/Emacs-23-0-3/info/emacs")
  (info-node . "Directories")
  (handler . Info-bookmark-jump))
 
The is handled in the changed definition of
`bookmark-get-bookmark-record', which accommodates both forms.
However, if you try to do, say, `C-x r l' in Emacs 22 and you have
created a bookmark of the latter form (using Emacs 23), then `C-x r l'
raises an error.  That's normal - Emacs 22 can't know about the
incompatible change that Emacs 23 introduces.
 
I don't know why this change was necessary. (Why?) But let's assume
that it was in fact necessary. The bug is that it is totally
undocumented.
 
Please _at least_ document this in NEWS. The _only_ thing mentioned in
NEWS about bookmarks is this:
 
 "*** bookmark provides `bookmark-make-record-function' so
 special major modes like Info can teach bookmark.el how to save
 and restore the relevant data."
 
 
 
In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600) of 2009-05-24 on
 SOFT-MJASON Windowing system distributor `Microsoft Corp.', version
 5.1.2600 configured using `configure --with-gcc (3.4)'
 

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