[%# components/pagination.tt

Pagination block. Call as follows:


    INCLUDE components/pagination.tt
      current     => 1, # current page we're viewing
      total_pages => 5, # total number of pages this is split into

Authors:
    Afuna <coder.dw@afunamatata.com>

Copyright (c) 2015 by Dreamwidth Studios, LLC.

This program is free software; you may redistribute it and/or modify it under
the same terms as Perl itself.  For a copy of the license, please reference
'perldoc perlartistic' or 'perldoc perlgpl'.
%]

[%- IF total_pages > 1 -%]
[% opts = {keep_args => 1};
  IF cur_args; 
    opts.cur_args = cur_args;
  END %]
<ul class="pagination">
  [% IF current > 1 %]
  [% opts.args = { page => (current - 1) } %]
    <li class="arrow"><a href="[% dw.create_url( path, opts ) %]">&laquo;</a></li>
  [% END %]

  [% IF total_pages <= 7 %]
  [%# If there's less than seven pages, print all of them. %]
    [%- INCLUDE print_pages range=[1..total_pages] -%]
  [% ELSE %]
    [%- # Time for weird math! There are three display possiblities:
        # 1) current page is near the start, so we have a big start block and small end
        # 2) current page is near the end, so we have a small start and big end
        # 3) current page is near neither, so we have a small start and end, and a center block
        # each setting will print 7 items - either:
        # 1) 5 pages, ellipsis, 1 page
        # 2) 1 page, ellipsis, 5 pages
        # 3) 1 page, ellipsis, 3 pages, ellipsis, 1 page

        end_range_start = total_pages - 4;
        start_range_end = 5; # 1 plus 4, as the end is last minus 4

        in_end_range = end_range_start < current;
        in_start_range = current < start_range_end;
        in_center_range = !(in_start_range || in_end_range); # both ends are collapsed

        start_range = in_start_range ? [1..start_range_end] : [1];
        end_range = in_end_range ? [end_range_start..total_pages] : [ total_pages] ;
        center_start = current - 1;
        center_end = current + 1;
    -%]
        [%- INCLUDE print_pages range=start_range -%]
        [%- INCLUDE print_ellipsis -%]

        [% IF in_center_range %]
          [%- INCLUDE print_pages range=[center_start..center_end] -%]
          [%- INCLUDE print_ellipsis -%]
        [% END %]

        [%- INCLUDE print_pages range=end_range -%]
  [% END %]

  [% IF current < total_pages %]
  [% opts.args = { page => (current + 1) } %]
    <li class="arrow"><a href="[% dw.create_url( path, opts) %]">&raquo;</a></li>
  [% END %]
</ul>
[%- END -%]

[%- BLOCK print_pages -%]
  [%- FOREACH page_num = range -%]
  [% opts.args = { page => page_num } %]
      <li[% IF page_num == current %] class="current" [% END %]><a href="[% dw.create_url( path, opts ) %]">[% page_num %]</a></li>
  [%- END -%]
[%- END -%]

[%- BLOCK print_ellipsis -%]
<li class="unavailable"><a href="">&hellip;</a></li>
[%- END -%]