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Disabling options when allies are present

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I’m working on a game system where various armies now get a bonus special rule if they don’t take any allies.

I’m having a hard time figuring out how to achieve this. I’ve tried a couple of things, but I haven’t found anything that works yet.

The special rules are presumably best implemented as options, so that's what I've done.

It’s easy to determine that a unit is an ally, using a tag template like [ally.?].

But I need to find a way to get that information to the units/options that are NOT allies. What the best way to do that?

I thought a good way would be to have a script (prelink) to check for [ally.?] and then set a global tag, but scripts can't set global tags, so that doesn't seem to work.
 
Thanks, but that's not really the issue. Like I said above, it's easy for any unit to find out if it's an ally (ally.?) or not an ally (!ally.?), but the challenge was to let a non-allied unit find out that there are other units in the roster that are in fact allies.

Here's how I ended up doing it. It feels a bit kludgy, but it works, so I'm keeping it for now.

Added a global linkset ("is_ally"), which has a Live condition (ally.?) and includes an option ("ally") which includes an autotag ("mixed_army"), which is a global tag, and therefore visible to even the non-allies.
 
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