/usr/share/jed/lib/backups.sl is in jed-common 1:0.99.19-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | % backups.sl -*- SLang -*-
%
% This file provides numbered backups whenever a file is saved,
% in a fashion similar to Emacs. For Jed 0.99.12 upwards.
% Written by Guido Gonzato <ggonza@tin.it>
%
% Last updated: 5 December 2000
%
% Usage:
% Let's suppose that you edit a new file, foo.bar. If you save it, the
% numbered backup copy foo.bar.~1~ will be created; saving again will
% create foo.bar.~2~, and so on. The standard backup copy is unaffected.
% Win32 users need to set the variable LFN=y to use backups.
%
% To enable numbered backups, put this line in your .jedrc:
% backups_on ();
private variable DO_BACKUPS = 1;
private define numbered_backups (buf)
{
variable status, version;
variable file;
if (0 == DO_BACKUPS)
return;
% check whether an old copy or backup files exist
version = 0;
do {
version++;
file = sprintf ("%s.~%d~", buf, version);
}
while (1 == file_status (file));
% mark the whole buffer and write it to file - don't use write_buffer ()
push_spot ();
mark_buffer ();
() = write_region_to_file (sprintf ("%s.~%d~", buf, version));
pop_spot();
}
%
define backups_off ()
{
DO_BACKUPS = 0;
flush ("Numbered backups disabled.");
}
%
define backups_on ()
{
DO_BACKUPS = 1;
flush ("Numbered backups enabled.");
}
%
add_to_hook ("_jed_save_buffer_before_hooks", &numbered_backups);
%
% --- End of file backups.sl ---
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