Commit 4db844a4 authored by Philipp Stephani's avatar Philipp Stephani

Reimplement auto-saving to visited files

This reacts to confusing behavior of 'auto-save-visited-file-name',
cf. Bug#25478.

* lisp/files.el (auto-save-visited-interval): New customization option.
(auto-save-visited-mode): New global minor mode.
(auto-save-visited-file-name): Make obsolete.
(auto-save--timer): New internal helper variable.

* doc/emacs/files.texi (Auto Save Files): Document
'auto-save-visited-mode' instead of obsolete
(Auto Save Control): Document customization option
parent e20ad449
......@@ -1040,14 +1040,23 @@ useful if it contains the deleted text. To reenable auto-saving after
this happens, save the buffer with @kbd{C-x C-s}, or use @kbd{C-u 1 M-x
@vindex auto-save-visited-file-name
@vindex auto-save-visited-mode
If you want auto-saving to be done in the visited file rather than
in a separate auto-save file, set the variable
@code{auto-save-visited-file-name} to a non-@code{nil} value. In this
mode, auto-saving is very similar to explicit saving. However,
differences still exist, in particular for modes which modify the
buffer-saving process in non-trivial ways via various hooks
(@pxref{Saving Buffers,,, elisp, The Emacs Lisp Reference Manual}).
in a separate auto-save file, enable the global minor mode
@code{auto-save-visited-mode}. In this mode, auto-saving is identical
to explicit saving. Note that this mode is orthogonal to the
@code{auto-save} mode described above; you can enable both at the same
time. However, if @code{auto-save} mode is active in some buffer and
the obsolete @code{auto-save-visited-file-name} variable is set to a
non-@code{nil} value, that buffer won't be affected by
You can use the variable @code{auto-save-visited-interval} to
customize the interval between auto-save operations in
@code{auto-save-visited-mode}; by default it's five seconds.
@code{auto-save-interval} and @code{auto-save-timeout} have no effect
on @code{auto-save-visited-mode}. @xref{Auto Save Control} for
details on these variables.
@vindex delete-auto-save-files
A buffer's auto-save file is deleted when you save the buffer in its
......@@ -1091,6 +1100,12 @@ makes sure all your work is saved if you go away from the terminal for
a while; second, it may avoid some auto-saving while you are actually
@vindex auto-save-visited-interval
When @code{auto-save-visited-mode} is enabled, Emacs will auto-save
file-visiting buffers after five seconds of idle time. You can
customize the variable @code{auto-save-visited-interval} to change the
idle time interval.
Emacs also does auto-saving whenever it gets a fatal error. This
includes killing the Emacs job with a shell command such as @samp{kill
%emacs}, or disconnecting a phone line or network connection.
......@@ -383,6 +383,12 @@ Strings such as ΌΣΟΣ are now correctly converted to Όσος when
capitalized instead of incorrect Όσοσ (compare lowercase sigma at the
end of the word).
** Emacs can now auto-save buffers to visited files in a more robust
manner via the new mode 'auto-save-visited-mode'. Unlike
'auto-save-visited-file-name', this mode uses the normal saving
procedure and therefore obeys saving hooks.
'auto-save-visited-file-name' is now obsolete.
* Changes in Specialized Modes and Packages in Emacs 26.1
......@@ -393,6 +393,46 @@ ignored."
:initialize 'custom-initialize-delay
:version "21.1")
(defvar auto-save--timer nil "Timer for `auto-save-visited-mode'.")
(defcustom auto-save-visited-interval 5
"Interval in seconds for `auto-save-visited-mode'.
If `auto-save-visited-mode' is enabled, Emacs will save all
buffers visiting a file to the visited file after it has been
idle for `auto-save-visited-interval' seconds."
:group 'auto-save
:type 'number
:version "26.1"
:set (lambda (symbol value)
(set-default symbol value)
(when auto-save--timer
(timer-set-idle-time auto-save--timer value :repeat))))
(define-minor-mode auto-save-visited-mode
"Toggle automatic saving to file-visiting buffers on or off.
With a prefix argument ARG, enable regular saving of all buffers
visiting a file if ARG is positive, and disable it otherwise.
Unlike `auto-save-mode', this mode will auto-save buffer contents
to the visited files directly and will also run all save-related
hooks. See Info node `Saving' for details of the save process.
If called from Lisp, enable the mode if ARG is omitted or nil,
and toggle it if ARG is `toggle'."
:group 'auto-save
:global t
(when auto-save--timer (kill-timer auto-save--timer))
(setq auto-save--timer
(when auto-save-visited-mode
auto-save-visited-interval :repeat
#'save-some-buffers :no-prompt
(lambda ()
(not (and buffer-auto-save-file-name
(make-obsolete-variable 'auto-save-visited-file-name 'auto-save-visited-mode
"Emacs 26.1")
(defcustom save-abbrevs t
"Non-nil means save word abbrevs too when files are saved.
If `silently', don't ask the user before saving."
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