$c->stash->{mappers} = [$c->model('DB::UriRevMapper')->all];

[% USE String %]

[% BLOCK renderDiffUri; %]
    [% nouri = 1 %]
    [% FOREACH m IN mappers %]
        [% base = m.baseuri %]
        [% url = bi1.uri %]
        [% path = url.replace(base, '') %]
        [% IF url.match(base) %]
          <a target="_new" href="[% m.uri.replace('_path_', path).replace('_1_', bi1.revision).replace('_2_', bi2.revision) %]">[% contents %]</a>
          [% nouri = 0 %]
        [% END %]
    [% END %]
    [% IF nouri %]
      [% contents %]
    [% END %]
[% END %]

                            <b>[% bi1.name %]</b></td><td>Revision changed from [% bi1.revision %] to [% bi2.revision %].

                            <b>[% bi1.name %]</b></td><td><tt>[% INCLUDE renderDiffUri contents=('Revision changed from ' _ bi1.revision _ ' to ' _ bi2.revision) %]</tt>

create table UriRevMapper (
    baseuri       text not null,
    uri           text not null,
    primary key   (baseuri)
);