[Freeciv-Dev] (PR#6966) root_req for other rulesets as well

["Morgan Jones" <morgan.jones@xxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=6966 >

The new root_req feature of tech.ruleset is great, but I was wondering if it 
could also be introduced to unit.ruleset (and possibly buildings.ruleset).

Essentially a unit can only be built if the player has the root_req technology 
for that particular unit.

This would be an excellent way of having nation-specific units, via init_techs 
in the nation rulesets.

Currently this is possible, but only if each nation or group of nations has 
it's own specific tech that allows their unit.

This is fine for LOTR type modpacks where each 'side' effectively has it's own 
tech tree.

But nation-specific techs can't be linked back into a common tech tree.

Eg:

Nation: French    ->  Tech: Chivalry      ->  Unit: Knights
Nation: Japanese  ->  Tech: Samurai Code  ->  Unit: Samurai
e.t.c.

These should all lead on to Leadership or whatever is next on the tree.  You 
don't necessarily want to create seperate branches of the same thing for each 
nation just because you made a small split earlier on.

I think root_req would be a simple and effective solution to this.