here it is again in forward order, with deletions and additions processed in a single pass: 
#!/usr/bin/perl -w

use Data::Dumper;

use Algorithm::Diff qw(diff);

use strict;

use subs qw(patch);

##
##

sub patch
{
    my @orig = @{shift()};
    my $diff = shift;

    my $shift = 0;

    for my $hunk (@$diff)
    {
        for my $change (@$hunk)
        {
            if ($change->[0] eq "-")
            {
                # process deletions
                splice @orig, $change->[1] + $shift, 1;
                --$shift;
            }
            elsif ($change->[0] eq "+")
            {
                # process additions
                splice @orig, $change->[1], 0, $change->[2];
                ++$shift;
            }
        }
    }

    @orig;
}

##
##

my @orig = qw(a b c e h j l m n p);
my @rev = qw(b c d e f j k l m r s t);

my $diff = diff \@orig, \@rev;

my @patched = patch \@orig, $diff;

print "Original:\t@orig", $/;
print "Revision:\t@rev", $/;
print "Patched:\t@patched", $/;

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In reply to Re: Yet another Algorithm::Diff question by mdillon
in thread Yet another Algorithm::Diff question by vroom

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