Algorithm::Diff::Callback - Use callbacks on computed differences
version 0.111
Use callbacks in your diff process to get better control over what will happen.
use Algorithm::Diff::Callback 'diff_arrays'; diff_arrays( \@old_family_members, \@new_family_members, added => sub { say 'Happy to hear about ', shift }, deleted => sub { say 'Sorry to hear about ', shift }, );
Or using hashes:
use Algorithm::Diff::Callback 'diff_hashes'; diff_hashes( \%old_details, \%new_details, added => sub { say 'Gained ', shift }, deleted => sub { say 'Lost ', shift }, changed => sub { my ( $key, $before, $after ) = @_; say "$key changed from $before to $after"; }, );
One of the difficulties when using diff modules is that they assume they know what you want the information for. Some give you formatted output, some give you just the values that changes (but neglect to mention how each changed) and some (such as Algorithm::Diff) give you way too much information that you now have to skim over and write long complex loops for.
Algorithm::Diff::Callback let's you pick what you're going to diff (Arrays or Hashes) and set callbacks for the diff process.
You'll need to declare to explicitly export these functions.
use Algorithm::Diff::Callback qw<diff_arrays diff_hashes>;
The first two parameters are array references to compare.
The rest of the parameters are keys for the type of callback you want and the corresponding callback. You can provide multiple callbacks. Supported keys are:
added
diff_arrays( \@old, \@new, added => sub { my $value = shift; say "$value was added to the array"; } );
deleted
diff_arrays( \@old, \@new, deleted => sub { my $value = shift; say "$value was deleted from the array"; } );
The first two parameters are hash references to compare.
diff_hashes( \%old, \%new, added => sub { my ( $key, $value ) = @_; say "$key ($value) was added to the hash"; } );
diff_hashes( \%old, \%new, deleted => sub { my ( $key, $value ) = @_; say "$key ($value) was deleted from the hash"; } );
changed
diff_hashes( \%old, \%new, changed => sub { my ( $key, $before, $after ) = @_; say "$key in the hash was changed from $before to $after"; } );
Please report bugs on the Github issues page at http://github.com/xsawyerx/algorithm-diff-callback/issues.
This module sports 100% test coverage, but in case you have more issues...
You can find documentation for this module with the perldoc command.
perldoc Algorithm::Diff::Callback
You can also look for information at:
Github issues tracker
http://github.com/xsawyerx/algorithm-diff-callback/issues
RT: CPAN's request tracker
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Algorithm-Diff-Callback
AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/Algorithm-Diff-Callback
CPAN Ratings
http://cpanratings.perl.org/d/Algorithm-Diff-Callback
Search CPAN
http://search.cpan.org/dist/Algorithm-Diff-Callback/
Algorithm::Diff
List::MoreUtils
Carp
Exporter
Sawyer X <xsawyerx@cpan.org>
This software is copyright (c) 2016 by Sawyer X.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Algorithm::Diff::Callback, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::Diff::Callback
CPAN shell
perl -MCPAN -e shell install Algorithm::Diff::Callback
For more information on module installation, please visit the detailed CPAN module installation guide.