1DirCompare(3)         User Contributed Perl Documentation        DirCompare(3)
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4

NAME

6       File::DirCompare - Perl module to compare two directories using
7       callbacks.
8

SYNOPSIS

10         use File::DirCompare;
11
12         # Simple diff -r --brief replacement
13         use File::Basename;
14         File::DirCompare->compare($dir1, $dir2, sub {
15           my ($a, $b) = @_;
16           if (! $b) {
17             printf "Only in %s: %s\n", dirname($a), basename($a);
18           } elsif (! $a) {
19             printf "Only in %s: %s\n", dirname($b), basename($b);
20           } else {
21             print "Files $a and $b differ\n";
22           }
23         });
24
25         # Version-control like Deleted/Added/Modified listing
26         my (@listing, @modified);     # use closure to collect results
27         File::DirCompare->compare('old_tree', 'new_tree', sub {
28           my ($a, $b) = @_;
29           if (! $b) {
30             push @listing, "D   $a";
31           } elsif (! $a) {
32             push @listing, "A   $b";
33           } else {
34             if (-f $a && -f $b) {
35               push @listing, "M   $b";
36               push @modified, $b;
37             } else {
38               # One file, one directory - treat as delete + add
39               push @listing, "D   $a";
40               push @listing, "A   $b";
41             }
42           }
43         });
44

DESCRIPTION

46       File::DirCompare is a perl module to compare two directories using a
47       callback, invoked for all files that are 'different' between the two
48       directories, and for any files that exist only in one or other
49       directory ('unique' files).
50
51       File::DirCompare has a single public compare() method, with the
52       following signature:
53
54         File::DirCompare->compare($dir1, $dir2, $sub, $opts);
55
56       The first three arguments are required - $dir1 and $dir2 are paths to
57       the two directories to be compared, and $sub is the subroutine
58       reference called for all unique or different files. $opts is an
59       optional hashref of options - see OPTIONS below.
60
61       The provided subroutine is called for all unique files, and for every
62       pair of 'different' files encountered, with the following signature:
63
64         $sub->($file1, $file2)
65
66       where $file1 and $file2 are the paths to the two files. For 'unique'
67       files i.e. where a file exists in only one directory, the subroutine is
68       called with the other argument 'undef' i.e. for:
69
70         $sub->($file1, undef)
71         $sub->(undef, $file2)
72
73       the first indicates $file1 exists only in the first directory given
74       ($dir1), and the second indicates $file2 exists only in the second
75       directory given ($dir2).
76
77   OPTIONS
78       The following optional arguments are supported, passed in using a hash
79       reference after the three required arguments to compare() e.g.
80
81         File::DirCompare->compare($dir1, $dir2, $sub, {
82           cmp             => $cmp_sub,
83           ignore_cmp      => 1,
84           ignore_unique   => 1,
85           matches         => $matches_sub,
86         });
87
88       cmp By default, two files are regarded as different if their contents
89           do not match (tested with File::Compare::compare). That default
90           behaviour can be overridden by providing a 'cmp' subroutine to do
91           the file comparison, returning zero if the two files are equal, and
92           non-zero if not.
93
94           E.g. to compare using modification times instead of file contents:
95
96             File::DirCompare->compare($dir1, $dir2, $sub, {
97               cmp => sub { -M $_[0] <=> -M $_[1] },
98             });
99
100       ignore_cmp
101           If you want to see all corresponding files, not just 'different'
102           ones, set the 'ignore_cmp' flag to tell File::DirCompare to skip
103           its file comparison checks i.e.
104
105             File::DirCompare->compare($dir1, $dir2, $sub,
106               { ignore_cmp => 1 });
107
108       ignore_unique
109           If you want to ignore files that only exist in one of the two
110           directories, set the 'ignore_unique' flag i.e.
111
112             File::DirCompare->compare($dir1, $dir2, $sub,
113               { ignore_unique => 1 });
114
115       matches
116           Subroutine to be called for file pairs that match, with the
117           following signature:
118
119             $sub->($file1, $file2)
120
121           These pairs are ordinarily ignored (unless "ignore_cmp" is set).
122

SEE ALSO

124       File::Dircmp, which provides similar functionality (and whose directory
125       walking code I've adapted for this module), but a simpler reporting-
126       only interface, something like the first example in the SYNOPSIS above.
127

AUTHOR AND CREDITS

129       Gavin Carr <gavin@openfusion.com.au>
130
131       Thanks to Robin Barker for a bug report and fix for glob problems with
132       whitespace.
133

135       Copyright 2006-2012 by Gavin Carr <gavin@openfusion.com.au>.
136
137       This library is free software; you can redistribute it and/or modify it
138       under the same terms as Perl itself.
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142perl v5.34.0                      2021-07-22                     DirCompare(3)
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