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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# 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. See the
# GNU General Public License for more details.
#-------------------------------------------------------------------------------
use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);
package Polymake::OverwriteFile;
use Symbol;
use Polymake::Struct (
[ new => '$;$' ],
[ '$dst' => '#1' ],
'$tempname',
[ '$handle' => 'undef' ],
);
# constructor: new OverwriteFile('path' [, 'layers'])
# 'layers' can be something like ':utf8' for proper storing of XML files.
sub new {
my $self=&_new;
my ($dir)= $self->dst =~ $directory_re;
$dir .= "/" if $dir;
$self->tempname=$dir . Tempfile->unique_name;
open $self->handle, ">$_[1]", $self->tempname
or die "can't create a new copy of ", $self->dst, ": $!\n";
($self->handle, $self);
}
# delete the new file, preserve the original one
sub abandon {
my ($self)=@_;
if (defined(fileno($self->handle))) {
close($self->handle);
}
unlink $self->tempname;
undef $self->tempname;
}
# delete both the new and the original files
sub unlink_both {
my ($self)=@_;
&abandon;
unless (unlink $self->dst) {
warn_print( "could not remove file ", $self->dst, ": $!" );
}
}
sub DESTROY {
my ($self)=@_;
if (defined(fileno($self->handle))) {
close($self->handle);
if ($@) {
if ($DebugLevel) {
warn_print( "incomplete new copy of ", $self->dst, " kept as ", $self->tempname );
} else {
unlink $self->tempname;
}
} else {
unlink $self->tempname;
Carp::croak( "creation of new copy of ", $self->dst, " is not properly completed" );
}
} elsif (defined $self->tempname && !rename($self->tempname, $self->dst)) {
warn_print( "could not rename temporary file ", $self->tempname, " to destination ", $self->dst, ": $!" );
}
}
1
# Local Variables:
# cperl-indent-level:3
# indent-tabs-mode:nil
# End:
|
