I will provide the code for those here:
world
New()
..()
initialized = 1
var
initialized = 0
proc
fix_autotile(at)
. = 255
if((at & 7)!=7)
. ^= 2
if((at & 28)!=28)
. ^= 8
if((at & 112)!=112)
. ^= 32
if((at & 193)!=193)
. ^= 128
. &= at
turf
tile
var
tile_id = "tile"
autotile
var
prejoined = 0 //whether this autotile should be considered already initialized by the automerge utility
list/autotile_matches //the list of tile_ids this tile will merge with.
proc
retile()
var/list/l = list(get_step(src,NORTH),get_step(src,NORTHEAST),get_step(src,EAST),get_step(src,SOUTHEAST),get_step(src,SOUTH),get_step(src,SOUTHWEST),get_step(src,WEST),get_step(src,NORTHWEST))
. = 0
for(var/count=1;count<9;count++)
if(hasmatch(l[count]))
. += 2 ** (count-1)
. = fix_autotile(.)
src.icon_state = "[.]"
hasmatch(turf/tile/t)
if(!istype(t,/turf/tile))
return 0
if(autotile_matches && t.tile_id in src.autotile_matches)
return 1
return 0
New()
if(global.initialized)
retile()
..()
The above code will allow you to set up your map in a manner that AutoMerge expects. It won't mess with any existing turfs or objects, only turf/tile/autotile.
Simply load your DMM into the utility, and let it run (it may take a while depending on your map).