Set the ammo count of a given weapon and detect the weapon "on hand" in Lua

That.
I'd like to know how to change the value of ammo for a given weapon and to be able to detect the weapon the player has in hand.

EDIT: I think I found the way to get which weapon is the player holding, like, ready to fire, but I still don't know how to change the ammo.

player.powers[pw_*] controls various powerups, including the ammo count of a particular weapon ring. The specific entries for each weapon ring's ammo count are pw_infinityring, pw_bouncering, pw_railring, pw_automaticring, pw_explosionring, pw_scatterring, and pw_grenadering.

To check if a player has a weapon, use (player.ringweapons & RW_*), available options RW_AUTO, RW_BOUNCE, RW_SCATTER, RW_GRENADE, RW_EXPLODE, RW_RAIL. The player's current weapon is stored under player.currentweapon, options same as before but replacing RW_ with WEP_, and using 0 for red/infinity ring.

Oh, thanks RedEnchilada!
Quick question, player.powers also contains the panels for every weapon too, right?

---------- Post added at 02:02 AM ---------- Previous post was at 01:59 AM ----------

Nevermind, checked some more wiki to find out the panels are stored somewhere else.