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Emacs periodically saves all files that you are visiting; this is called auto-saving. Auto-saving prevents you from losing more than a limited amount of work if the system crashes. By default, auto-saves happen every 300 keystrokes, or after around 30 seconds of idle time. Voir Auto Save: (emacs)Auto Save section `Auto-Saving: Protection Against Disasters' dans The GNU Emacs Manual, for information on auto-save for users. Here we describe the functions used to implement auto-saving and the variables that control them.
This buffer-local variable is the name of the file used for auto-saving the
current buffer. It is nil if the buffer should not be auto-saved.
buffer-auto-save-file-name
⇒ "/xcssun/users/rms/lewis/#backups.texi#"
|
When used interactively without an argument, this command is a toggle
switch: it turns on auto-saving of the current buffer if it is off, and vice
versa. With an argument arg, the command turns auto-saving on if the
value of arg is t, a nonempty list, or a positive integer.
Otherwise, it turns auto-saving off.
This function returns a non-nil value if filename is a string
that could be the name of an auto-save file. It assumes the usual naming
convention for auto-save files: a name that begins and ends with hash marks
(‘#’) is a possible auto-save file name. The argument filename
should not contain a directory part.
(make-auto-save-file-name)
⇒ "/xcssun/users/rms/lewis/#backups.texi#"
(auto-save-file-name-p "#backups.texi#")
⇒ 0
(auto-save-file-name-p "backups.texi")
⇒ nil
|
The standard definition of this function is as follows:
(defun auto-save-file-name-p (filename) "Return non-nil if FILENAME can be yielded by..." (string-match "^#.*#$" filename)) |
This function exists so that you can customize it if you wish to change the
naming convention for auto-save files. If you redefine it, be sure to
redefine the function make-auto-save-file-name correspondingly.
This function returns the file name to use for auto-saving the current
buffer. This is just the file name with hash marks (‘#’) prepended and
appended to it. This function does not look at the variable
auto-save-visited-file-name (described below); callers of this
function should check that variable first.
(make-auto-save-file-name)
⇒ "/xcssun/users/rms/lewis/#backups.texi#"
|
Here is a simplified version of the standard definition of this function:
(defun make-auto-save-file-name ()
"Return file name to use for auto-saves \
of current buffer.."
(if buffer-file-name
(concat
(file-name-directory buffer-file-name)
"#"
(file-name-nondirectory buffer-file-name)
"#")
(expand-file-name
(concat "#%" (buffer-name) "#"))))
|
This exists as a separate function so that you can redefine it to customize
the naming convention for auto-save files. Be sure to change
auto-save-file-name-p in a corresponding way.
If this variable is non-nil, Emacs auto-saves buffers in the files
they are visiting. That is, the auto-save is done in the same file that you
are editing. Normally, this variable is nil, so auto-save files have
distinct names that are created by make-auto-save-file-name.
When you change the value of this variable, the new value does not take
effect in an existing buffer until the next time auto-save mode is reenabled
in it. If auto-save mode is already enabled, auto-saves continue to go in
the same file name until auto-save-mode is called again.
This function returns t if the current buffer has been auto-saved
since the last time it was read in or saved.
This function marks the current buffer as auto-saved. The buffer will not
be auto-saved again until the buffer text is changed again. The function
returns nil.
The value of this variable specifies how often to do auto-saving, in terms of number of input events. Each time this many additional input events are read, Emacs does auto-saving for all buffers in which that is enabled. Setting this to zero disables autosaving based on the number of characters typed.
The value of this variable is the number of seconds of idle time that should cause auto-saving. Each time the user pauses for this long, Emacs does auto-saving for all buffers in which that is enabled. (If the current buffer is large, the specified timeout is multiplied by a factor that increases as the size increases; for a million-byte buffer, the factor is almost 4.)
If the value is zero or nil, then auto-saving is not done as a result
of idleness, only after a certain number of input events as specified by
auto-save-interval.
This normal hook is run whenever an auto-save is about to happen.
If this variable is non-nil, buffers that are visiting files have
auto-saving enabled by default. Otherwise, they do not.
This function auto-saves all buffers that need to be auto-saved. It saves all buffers for which auto-saving is enabled and that have been changed since the previous auto-save.
If any buffers are auto-saved, do-auto-save normally displays a
message saying ‘Auto-saving...’ in the echo area while auto-saving is
going on. However, if no-message is non-nil, the message is
inhibited.
If current-only is non-nil, only the current buffer is
auto-saved.
This function deletes the current buffer's auto-save file if
delete-auto-save-files is non-nil. It is called every time a
buffer is saved.
Unless force is non-nil, this function only deletes the file if
it was written by the current Emacs session since the last true save.
This variable is used by the function
delete-auto-save-file-if-necessary. If it is non-nil, Emacs
deletes auto-save files when a true save is done (in the visited file).
This saves disk space and unclutters your directory.
This function adjusts the current buffer's auto-save file name if the visited file name has changed. It also renames an existing auto-save file, if it was made in the current Emacs session. If the visited file name has not changed, this function does nothing.
The value of this buffer-local variable is the length of the current buffer, when it was last read in, saved, or auto-saved. This is used to detect a substantial decrease in size, and turn off auto-saving in response.
If it is -1, that means auto-saving is temporarily shut off in this buffer due to a substantial decrease in size. Explicitly saving the buffer stores a positive value in this variable, thus reenabling auto-saving. Turning auto-save mode off or on also updates this variable, so that the substantial decrease in size is forgotten.
This variable (if non-nil) specifies a file for recording the names
of all the auto-save files. Each time Emacs does auto-saving, it writes two
lines into this file for each buffer that has auto-saving enabled. The
first line gives the name of the visited file (it's empty if the buffer has
none), and the second gives the name of the auto-save file.
When Emacs exits normally, it deletes this file; if Emacs crashes, you can
look in the file to find all the auto-save files that might contain work
that was otherwise lost. The recover-session command uses this file
to find them.
The default name for this file specifies your home directory and starts with ‘.saves-’. It also contains the Emacs process ID and the host name.
After Emacs reads your init file, it initializes
auto-save-list-file-name (if you have not already set it
non-nil) based on this prefix, adding the host name and process ID.
If you set this to nil in your init file, then Emacs does not
initialize auto-save-list-file-name.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.