User:Monster Iestyn/2.1 to 2.2 Lua migration guide

Direct replacements:

2.1	2.2
thinkers.iterate("mobj")	mobjs.iterate()
mobj.flags & MF_AMBUSH	mobj.flags2 & MF2_AMBUSH
mobj.flags2 & MF2_STANDONME (can you stand on this object?)	mobj.flags & MF_SOLID (solid objects now let you stand on them by default unlike in 2.1)
mobj.flags2 & MF2_PUSHED	mobj.eflags & MFE_PUSHED
player.mo.health - 1 or player.health - 1 (for getting ring count)	player.rings (note: player.mo.health still exists but is only ever 1 or 0 now, to indicate if the player is alive or dead)
player.pflags & PF_ITEMHANG	player.powers[pw_carry] == CR_GENERIC
player.pflags & PF_CARRIED	player.powers[pw_carry] == CR_PLAYER
player.pflags & PF_ROPEHANG	player.powers[pw_carry] == CR_ROPEHANG
player.pflags & PF_MACESPIN	player.powers[pw_carry] == CR_MACESPIN
player.pflags & PF_NIGHTSMODE	player.powers[pw_carry] == CR_NIGHTSMODE
player.pflags & PF_NIGHTSFALL	player.powers[pw_carry] == CR_NIGHTSFALL
player.powers[pw_ingoop] != 0	player.powers[pw_carry] == CR_BRAKGOOP
ffloor.flags & FF_ONLYKNUX	ffloor.flags & FF_STRONGBUST
P_Random()	P_RandomByte()
P_DamageMobj(target, inflictor, source, 10000) (for insta-killing players)	P_DamageMobj(target, inflictor, source, 1, DMG_INSTAKILL)
P_DamageMobj(target, inflictor, source, 42000) (for insta-killing spectators)	P_DamageMobj(target, inflictor, source, 1, DMG_SPECTATOR)
P_CheckSolidLava(mo, rover)	P_CheckSolidLava(rover)

Technically still working but with better alternatives:

2.1	2.2
player.mo.tracer and player.mo.tracer.type == MT_TUBEWAYPOINT (are we in a zoomtube?)	player.powers[pw_carry] == CR_ZOOMTUBE
v.cachePatch("THOKA0") (getting a regular sprite patch for HUD code)	v.getSpritePatch(SPR_THOK, 0, 0) or (the prefix can be given as a string in the first argument) v.getSpritePatch("THOK", 0, 0) or (since this is frame 0, angle 0) v.getSpritePatch(SPR_THOK) or v.getSpritePatch("THOK") (note: for player sprites, use v.getSpritePatch2)
P_ElementalFireTrail(player)	P_ElementalFire(player)