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/* backup.h -- declarations for making Emacs style backup file names
Copyright (C) 1992 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it without restriction.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */
/* When to make backup files. Analagous to 'version-control'
in Emacs. */
enum backup_mode
{
/* Uninitialized or indeterminate value */
unknown,
/* Never make backups. */
none,
/* Make simple backups of every file. */
simple,
/* Make numbered backups of files that already have numbered backups,
and simple backups of the others. */
numbered_existing,
/* Make numbered backups of every file. */
numbered
};
struct version_control_values
{
enum backup_mode value;
char *name;
};
/* Determine the value of `version_control' by looking in the
environment variable "VERSION_CONTROL". Defaults to
numbered_existing. */
extern enum backup_mode version_control_value ();
/* Initialize information used in determining backup filenames. */
extern void initialize_backups ();
/* Make a backup copy of FILE, taking into account version-control.
See the description at the beginning of the file for details. */
extern void make_backup ();
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