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I want to enumerate all lists that a user has permission to view from within a
TT2 custom action script.  I've had a look had the default "lists.tt2", but
this appears to being passed a variable "which" but this doesn't appear to
exist or be available from within a custom action.

(If I try pasting the relevant portions of lists.tt2 into a custom action, the
following catch occurs:

 [% IF action == 'which' %]
  [% IF ! which %]
   &nbsp;&nbsp;<span class="color_dark">[%|loc(user.email)%]No subscriptions
with address <strong>%1</strong>![%END%]</span>
   <br />
  [% END %]
.............

If someone could please advise how I should proceed it would be appreciated.

Thanks,

Patrick