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This function makes a backup of the file visited by the current buffer, if
appropriate. It is called by save-buffer before saving the buffer
the first time.
If a backup was made by renaming, the return value is a cons cell of the
form (modes . backupname), where modes are the mode bits
of the original file, as returned by file-modes (voir la section Other Information about Files), and backupname is the
name of the backup. In all other cases, that is, if a backup was made by
copying or if no backup was made, this function returns nil.
This buffer-local variable says whether this buffer's file has been backed
up on account of this buffer. If it is non-nil, the backup file has
been written. Otherwise, the file should be backed up when it is next saved
(if backups are enabled). This is a permanent local;
kill-all-local-variables does not alter it.
This variable determines whether or not to make backup files. If it is
non-nil, then Emacs creates a backup of each file when it is saved
for the first time—provided that backup-inhibited is nil
(see below).
The following example shows how to change the make-backup-files
variable only in the Rmail buffers and not elsewhere. Setting it nil
stops Emacs from making backups of these files, which may save disk space.
(You would put this code in your init file.)
(add-hook 'rmail-mode-hook
(function (lambda ()
(make-local-variable
'make-backup-files)
(setq make-backup-files nil))))
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This variable's value is a function to be called on certain occasions to
decide whether a file should have backup files. The function receives one
argument, an absolute file name to consider. If the function returns
nil, backups are disabled for that file. Otherwise, the other
variables in this section say whether and how to make backups.
The default value is normal-backup-enable-predicate, which checks for
files in temporary-file-directory and
small-temporary-file-directory.
If this variable is non-nil, backups are inhibited. It records the
result of testing backup-enable-predicate on the visited file name.
It can also coherently be used by other mechanisms that inhibit backups
based on which file is visited. For example, VC sets this variable
non-nil to prevent making backups for files managed with a version
control system.
This is a permanent local, so that changing the major mode does not lose its
value. Major modes should not set this variable—they should set
make-backup-files instead.
This variable's value is an alist of filename patterns and backup directory names. Each element looks like
(regexp . directory) |
Backups of files with names matching regexp will be made in directory. directory may be relative or absolute. If it is absolute, so that all matching files are backed up into the same directory, the file names in this directory will be the full name of the file backed up with all directory separators changed to ‘!’ to prevent clashes. This will not work correctly if your filesystem truncates the resulting name.
For the common case of all backups going into one directory, the alist should contain a single element pairing ‘"."’ with the appropriate directory name.
If this variable is nil, or it fails to match a filename, the backup
is made in the original file's directory.
On MS-DOS filesystems without long names this variable is always ignored.
This variable's value is a function to use for making backups instead of the
default make-backup-file-name. A value of nil gives the
default make-backup-file-name behavior. Voir la section Naming Backup Files.
This could be buffer-local to do something special for specific files. If
you define it, you may need to change backup-file-name-p and
file-name-sans-versions too.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.