Create own effects types?

[BadPractice]

HI,
I found in the wiki a list of effect types (like Tech_Parasite, Growth_Food etc)

Is it possible to create his own effect types(via lua script or so)?

[sveinung]

Is it possible to create his own effect types

You could always write a patch adding the new effect. If you submit it to our patch tracker and we like it it may even be included in standard Freeciv. If it is included you (or your players) won't have to build a custom version of Freeciv including your patch for each kind of system you wish to support with your ruleset.

(via lua script or so)?

Not yet. One of the first patches I sent to Freeciv was to allow this. (It don't work any more) Haven't looked at it for years. One problem of implementing it that I didn't know back then is to make the built in AI handle custom effects. That could be solved by a static numeric value showing how bad/good x amount of the effect is. It could also be solved by a Lua call back giving the same value but that is more expensive (measured in performance). If you are interested I could try to finish it, but it probably won't be a part of official Freeciv before version 3.0.