[%#

=head1 MACROS

These are some default macros which are used by various templates in the
system.

=head2 link

This creates an <A HREF="... to a command in the Apache::MVC system by
catenating the base URL, table, command, and any arguments.

#%]
[%
MACRO link(table, command, additional, label) BLOCK;
    SET lnk = base _ "/" _ table _ "/" _ command _ "/" _ additional;
    lnk = lnk | uri | html;
    '<a href="' _ lnk _ '">';
    label;
    "</a>";
END;
%]

[%#

=head2 maybe_link_view

C<maybe_link_view> takes something returned from the database - either
some ordinary data, or an object in a related class expanded by a
has-a relationship. If it is an object, it constructs a link to the view
command for that object. Otherwise, it just displays the data.

#%]

[%
MACRO maybe_link_view(object) BLOCK;
    IF object.table; # It's an object, i.e. a has-a
        link(object.table, "view", object.id, object);
    ELSE;
        object;
    END;
END;
%]

[%#

=head2 display_line

C<display_line> is used in the list template to display a row from the
database, by iterating over the columns and displaying the data for each
column. It misses out the C<id> column by default, and magically
URLifies columns called C<url>. This may be considered too much magic
for some.

#%]
[% MACRO display_line(item) BLOCK;
    FOR col = classmetadata.list_columns;
        NEXT IF col == "id";
        "<td>";
        IF col == "url" AND item.url;
            '<a href="'; item.url; '"> '; item.url; '</a>';
        ELSIF col == item.stringify_column;
            maybe_link_view(item);
        ELSE;
            maybe_link_view(item.$col);
        END;
        "</td>";
    END;
    '<td class="actions">';
    button(item, "edit");
    button(item, "delete");
    "</td>";
END %]
[%#

=head2 button

This is a generic button, which performs an action on an object.

=cut

#%]
[% MACRO button(obj, action) BLOCK; %]
<a class="action" href="[% base %]/[% obj.table %]/[% action %]/[% obj.id %]">
    [% action %]</a>
[% END %]
[%#

=head2 view_related

This takes an object, and looks up the C<related_accessors>; this should
give a list of accessors that can be called to get a list of related
objects. It then displays a title for that accessor, (i.e. "Beers" for a
brewery) calls the accesor, and displays a list of the results. 

=cut

#%]
[% 
MACRO view_related(object) BLOCK;
    FOR accessor = classmetadata.related_accessors.list;
        "<div id=\"subtitle\">"; accessor | ucfirst; "</div>\n";
        "<ul id=\"vlist\">";
        FOR thing = object.$accessor;
            "<li>"; maybe_link_view(thing); "</li>\n";
        END;
        "</ul>";
    END; 
END;

MACRO test_xxxx(myblock) BLOCK;
    FOR col = classmetadata.columns;
        NEXT IF col == "id";
        myblock;
    END;
END;
%]