This is Perl module Iterator::GroupedRange.
INSTALLATION
Iterator::GroupedRange installation is straightforward. If your CPAN shell is set up,
you should just be able to do
% cpan Iterator::GroupedRange
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
Iterator::GroupedRange documentation is available as in POD. So you can do:
% perldoc Iterator::GroupedRange
to read the documentation online with your favorite pager.
Toru Yamaguchi