GNU bug report logs - #25460
26.0.50; Documentation request: Save/write hooks and autosave

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; Documentation request: Save/write hooks and autosave
Date: Mon, 16 Jan 2017 19:09:58 +0100

Please document how {before,after}-save-hook and
write-{buffer,file}-functions relate to autosave, both in the docstrings
of these hooks and in the Emacs Lisp manual.  I noticed that even if
auto-save-visited-file-name is t, autosaving doesn't run
before-save-hook.  The documentation should provide some guidance which
hook to use depending on the value of auto-save-visited-file-name and on
whether the current save operation is an auto-save or not.


In GNU Emacs 26.0.50.28 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2017-01-13 built on localhost
Repository revision: d018843e0e8065b1c9de9474521db069e1aa0025
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Recent messages:

Configured using:
 'configure --with-modules --enable-checking
 --enable-check-lisp-object-type 'CFLAGS=-ggdb3 -O0''

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
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/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/mail-parse hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/mail-parse
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/rfc2231 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/rfc2231
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/starttls hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/starttls
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/sieve hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/sieve
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/international/utf7 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/utf7
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/registry hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/registry
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/international/rfc1843 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/rfc1843
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/rfc2045 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/rfc2045
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/yenc hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/yenc
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/sieve-manage hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/sieve-manage
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/mailcap hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/mailcap
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/auth-source hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/auth-source
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/rtree hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/rtree
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/html2text hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/html2text
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/ecomplete hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/ecomplete
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/image/compface hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/compface
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/mail-prsvr hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/mail-prsvr
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/qp hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/qp
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/ietf-drums hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/ietf-drums
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/rfc2047 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/rfc2047
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/sieve-mode hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/sieve-mode
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/plstore hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/plstore
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/net/pop3 hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/pop3
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/mail/flow-fill hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/gnus/flow-fill
/usr/local/google/home/phst/ThirdParty/Emacs/lisp/gs hides /usr/local/google/home/phst/ThirdParty/Emacs/lisp/obsolete/gs

Features:
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bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase cl-lib
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mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
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simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 97629 7213)
 (symbols 48 20220 1)
 (miscs 40 331 181)
 (strings 32 17991 4050)
 (string-bytes 1 592077)
 (vectors 16 14071)
 (vector-slots 8 471819 3575)
 (floats 8 181 12)
 (intervals 56 207 0)
 (buffers 976 12)
 (heap 1024 22205 1120))

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Message #10 received at 25460-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 25460-done <at> debbugs.gnu.org
Subject: Re: bug#25460: 26.0.50;
 Documentation request: Save/write hooks and autosave
Date: Fri, 20 Jan 2017 11:03:18 +0200

> From: Philipp Stephani <p.stephani2 <at> gmail.com>
> Date: Mon, 16 Jan 2017 19:09:58 +0100
> 
> Please document how {before,after}-save-hook and
> write-{buffer,file}-functions relate to autosave

They don't.  These hooks are only run by basic-save-buffer.

> I noticed that even if auto-save-visited-file-name is t, autosaving
> doesn't run before-save-hook.

I added notes (on the release branch) that these hooks are only run by
save-buffer.

> The documentation should provide some guidance which hook to use
> depending on the value of auto-save-visited-file-name and on whether
> the current save operation is an auto-save or not.

It looks like you consider auto-save-visited-file-name as an option
that makes auto-saving exactly equivalent to saving the buffer.  But
that is far from reality; in fact, as I wrote elsewhere, this option
has subtle issues, so much so that I don't recommend its use at all.
If we want it to be equivalent to saving, we should reimplement it so
that auto-saving uses basic-save-buffer when this option is non-nil.
But that is probably something for a separate bug report, so I'm
closing this one.

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