I wasn't 100% clear on what you needed to do. This is my guess at what you were asking for. If this isn't it let me know. An example would be most helpful if this wasn't what you needed.

perl code

sub ContextString
{
   my $context = shift();
   
   if($context eq "foo")
   {
      return "String 1";
   }
   elsif($context eq "bar")
   {
      return "String 2";
   }
}

my $t_vars = {
               context_sub => \&ContextString,
               other => "mmm donuts",
             };

# config opts are whatever you need them to be
my $template = Template->new($config_opts);

$template->process("template_file.tt",$t_vars) ||
   die $template->error();
[download]

now for the template code

.
.
.
[% context = "bar" %]
[% IF context %]
  Message: [% context_sub(context) %]
[% END %]
.
.
.
[download]

in this case the template would be

Message: String 2
[download]

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