Linux Certif

Toute la documentation sur la certification Linux LPI

VCS::Lite::Delta.3pm

NAME

VCS::Lite::Delta - VCS::Lite differences

SYNOPSIS

   use VCS::Lite;
 
   # diff
 
   my $lit = VCS::Lite->new('/home/me/foo1.txt');
   my $lit2 = VCS::Lite->new('/home/me/foo2.txt');
   my $difftxt = $lit->delta($lit2)->diff;
   print OUTFILE $difftxt;
 
   # patch
 
   my $delt = VCS::Lite::Delta->new('/home/me/patch.diff');
   my $lit3 = $lit->patch($delt);
   print OUTFILE $lit3->text;
 
 

DESCRIPTION

This module provides a Delta class for the differencing functionality of VCS::Lite

API

new

The underlying object of VCS::Lite::Delta is an array of difference chunks (hunks) such as that returned by Algorithm::Diff.

The constructor takes the following forms:

   my $delt = VCS::Lite::Delta->new( '/my/file.diff',$sep); # File name
   my $delt = VCS::Lite::Delta->new( \*FILE,$sep);       # File handle
   my $delt = VCS::Lite::Delta->new( \$string,$sep); # String as scalar ref
   my $delt = VCS::Lite::Delta->new( \@foo, $id1, $id2) # Array ref
 
 

$sep here is a regexp by which to split strings into tokens. The default is to use the natural perl mechanism of $/ (which is emulated when not reading from a file). The arrayref form is assuming an array of hunks such as the output from Algorithm::Diff::diff.

The other forms assume the input is the text form of a diff listing, either in diff format, or in unified format. The input is parsed, and errors are reported.

diff

   print OUTFILE $delt->diff
 
 

This generates a standard diff format, for example:

4c4 < Now wherefore stopp'st thou me? --- > Now wherefore stoppest thou me?

udiff

   print OUTFILE $delt->udiff
 
 

This generates a unified diff (like diff -u) similar to the form in which patches are submitted.

id

   my ($id1,$id2) = $delt->id;
   $delt2->id('foo.pl@@1','foo.pl@@3')
 
 

The id method allows get and set of the names associated with the two elements being diffed. The id is set for delta objects returned by VCS::Lite->diff, to the element IDs of the VCS::Lite objects being diffed.

Diff format omits the file names, hence the IDs will not be populated by new. This is not the case with diff -u format, which includes the file names which are passed in and available as IDs.

hunks

   my @hunklist = $delt->hunks
 
 

A hunk is a technical term for a section of input containing a difference. Each hunk is an arrayref, containing the block of lines. Each line is itself an arrayref, for example:

   [
     [ '+', 9, 'use Acme::Foo;'],
     [ '-', 9, 'use Acme::Bar;'],
   ]
 
 

See the documentation on Algorithm::Diff for more details of this structure.

BUGS, PATCHES & FIXES

There are no known bugs at the time of this release. However, if you spot a bug or are experiencing difficulties that are not explained within the POD documentation, please send an email to barbie@cpan.org or submit a bug to the RT system (see link below). However, it would help greatly if you are able to pinpoint problems or even supply a patch.

http://rt.cpan.org/Public/Dist/Display.html?Name=VCS-Lite

Fixes are dependant upon their severity and my availablity. Should a fix not be forthcoming, please feel free to (politely) remind me.

AUTHOR

   Original Author: Ivor Williams (RIP)          2008-2009
   Current Maintainer: Barbie <barbie@cpan.org>  2009
 
 

COPYRIGHT

   Copyright (c) Ivor Williams, 2002-2006
   Copyright (c) Barbie,        2009
 
 

LICENCE

You may use, modify and distribute this module under the same terms as Perl itself.

SEE ALSO

Algorithm::Diff.