Merge pull request #15011 from Putnam3145/lavaland-random-atmos

Port of randomized planet atmos

code/controllers/subsystem/air.dm

@@ -37,7 +37,8 @@ SUBSYSTEM_DEF(air)
 
 	//atmos singletons
 	var/list/gas_reactions = list()
-
+	var/list/atmos_gen
+	var/list/planetary = list() //auxmos already caches static planetary mixes but could be convenient to do so here too
 	//Special functions lists
 	var/list/turf/open/high_pressure_delta = list()
 
@@ -475,6 +476,20 @@ SUBSYSTEM_DEF(air)
 
 	return pipe_init_dirs_cache[type]["[dir]"]
 
+/datum/controller/subsystem/air/proc/generate_atmos()
+	atmos_gen = list()
+	for(var/T in subtypesof(/datum/atmosphere))
+		var/datum/atmosphere/atmostype = T
+		atmos_gen[initial(atmostype.id)] = new atmostype
+
+/datum/controller/subsystem/air/proc/preprocess_gas_string(gas_string)
+	if(!atmos_gen)
+		generate_atmos()
+	if(!atmos_gen[gas_string])
+		return gas_string
+	var/datum/atmosphere/mix = atmos_gen[gas_string]
+	return mix.gas_string
+
 #undef SSAIR_PIPENETS
 #undef SSAIR_ATMOSMACHINERY
 #undef SSAIR_EXCITEDGROUPS