|
|
Makefile: multiple target variable substitution
|
|
DirCompare(3pm) User Contributed Perl Documentation DirCompare(3pm) NAME
File::DirCompare - Perl module to compare two directories using callbacks. SYNOPSIS
use File::DirCompare; # Simple diff -r --brief replacement use File::Basename; File::DirCompare->compare($dir1, $dir2, sub { my ($a, $b) = @_; if (! $b) { printf "Only in %s: %s ", dirname($a), basename($a); } elsif (! $a) { printf "Only in %s: %s ", dirname($b), basename($b); } else { print "Files $a and $b differ "; } }); # Version-control like Deleted/Added/Modified listing my (@listing, @modified); # use closure to collect results File::DirCompare->compare('old_tree', 'new_tree', sub { my ($a, $b) = @_; if (! $b) { push @listing, "D $a"; } elsif (! $a) { push @listing, "A $b"; } else { if (-f $a && -f $b) { push @listing, "M $b"; push @modified, $b; } else { # One file, one directory - treat as delete + add push @listing, "D $a"; push @listing, "A $b"; } } }); DESCRIPTION
File::DirCompare is a perl module to compare two directories using a callback, invoked for all files that are 'different' between the two directories, and for any files that exist only in one or other directory ('unique' files). File::DirCompare has a single public compare() method, with the following signature: File::DirCompare->compare($dir1, $dir2, $sub, $opts); The first three arguments are required - $dir1 and $dir2 are paths to the two directories to be compared, and $sub is the subroutine reference called for all unique or different files. $opts is an optional hashref of options - see OPTIONS below. The provided subroutine is called for all unique files, and for every pair of 'different' files encountered, with the following signature: $sub->($file1, $file2) where $file1 and $file2 are the paths to the two files. For 'unique' files i.e. where a file exists in only one directory, the subroutine is called with the other argument 'undef' i.e. for: $sub->($file1, undef) $sub->(undef, $file2) the first indicates $file1 exists only in the first directory given ($dir1), and the second indicates $file2 exists only in the second directory given ($dir2). OPTIONS The following optional arguments are supported, passed in using a hash reference after the three required arguments to compare() e.g. File::DirCompare->compare($dir1, $dir2, $sub, { cmp => $cmp_sub, ignore_unique => 1, }); cmp By default, two files are regarded as different if their contents do not match (tested with File::Compare::compare). That default behaviour can be overridden by providing a 'cmp' subroutine to do the file comparison, returning zero if the two files are equal, and non-zero if not. E.g. to compare using modification times instead of file contents: File::DirCompare->compare($dir1, $dir2, $sub, { cmp => sub { -M $_[0] <=> -M $_[1] }, }); ignore_cmp If you want to see all corresponding files, not just 'different' ones, set the 'ignore_cmp' flag to tell File::DirCompare to skip its file comparison checks i.e. File::DirCompare->compare($dir1, $dir2, $sub, { ignore_cmp => 1 }); ignore_unique If you want to ignore files that only exist in one of the two directories, set the 'ignore_unique' flag i.e. File::DirCompare->compare($dir1, $dir2, $sub, { ignore_unique => 1 }); SEE ALSO
File::Dircmp, which provides similar functionality (and whose directory walking code I've adapted for this module), but a simpler reporting-only interface, something like the first example in the SYNOPSIS above. AUTHOR AND CREDITS
Gavin Carr <gavin@openfusion.com.au> Thanks to Robin Barker for a bug report and fix for glob problems with whitespace. COPYRIGHT AND LICENSE
Copyright 2006-2007 by Gavin Carr. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-03-02 DirCompare(3pm)
