I've been playing with command blocks lately, and I'm playing around with one of those "server mods in vanilla" type mechanisms. Basically, I've got a clock set up that makes players turn invisible when they're sneaking (I'm building this in 1.9, using the new repeating/chained blocks). That sequence looks like this:
Run this to initialize:
/scoreboard objectives add sneaking stat.sneakOneCm
Run these in sequence every tick:
/effect @a[score_sneaking_min=1] minecraft:invisibility 1 0 true /scoreboard players reset @a[score_sneaking_min=1] sneaking
The thing is, I want to make it so that if a player gets too close to another player or hostile mob, they become exposed, preventing them from getting the invisibility effect. I got as far as modifying the above command to check a scoreboard objective:
/effect @a[score_sneaking_min=1,score_tooClose=0] minecraft:invisibility 1 0 true
But I don't really know how I would test for that. I thought maybe something like /execute @a ~ ~ ~ testfor (etc.) but then I wouldn't be able to do anything with the result of the test, because it's being executed on behalf of something that doesn't care. I'm just not sure what the right train of thought here is.
Thanks for any help you can provide.