[stringtemplate-interest] Multimethods

[Roman Odaisky]

Greetings,

I’m developing a site using Django and StringTemplate. It has so far been 
wonderful.

However, a question has arisen which I seem unable to solve using the current 
framework.

Following Django conventions, I add ‘get_absolute_url’ methods to model 
classes. Then I use <a href="$something.absolute_url$"> to create links. That 
allows me to change the URL layout of the site however I like, and links stay 
correct. (The site is still under construction, so I don’t have to worry 
about dangling references.) A typical construct is:

<p>You have the following gadgets and widgets:
<ul>
$user.allof_gadget:{g|
  <li><p>$g.title$</p>
  <ol>$g.allof_widget:{w|
    <li><a href="$w.absolute_url$">$w$</a></li>
}$
  </li>
}$
</ul></p>

However, some pages need URLs that refer to more than one item, neither of 
which is deducible from the other. This one is similar to my needs:

https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/42160

So, what I need is to call a Python function that would determine a URL for 
two items. How is it possible to invoke such a multimethod from within 
StringTemplate? Can ST create templates that would call user-defined 
functions, like this:

stg.defineTemplate("foo", foo)

def foo(**kwargs):
    ...do something
    return something

and $foo(x=1, y=2)$ would call the function with the required keyword 
arguments?

-- 
TIA
Roman.
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