Adds a simple 'persistence' subsystem (#21553)

.gitignore

@@ -61,6 +61,9 @@ players2.sqlite
 # Round-end statistics
 /data/statfiles/*
 
+# Persistence files
+/data/persistence/*
+
 cfg
 
 .vscode

__DEFINES/subsystem.dm

@@ -24,6 +24,7 @@
 #define SS_INIT_TICKER            -21
 #define SS_INIT_FINISH            -22
 #define SS_INIT_MINIMAP           -23
+#define SS_INIT_PERSISTENCE       -99
 
 
 #define SS_PRIORITY_TICKER         200

code/controllers/subsystem/init/persistence.dm

@@ -0,0 +1,42 @@
+var/datum/subsystem/persistence/SSpersistence
+
+/datum/subsystem/persistence
+	name       = "Persistence"
+	init_order = SS_INIT_PERSISTENCE
+	flags      = SS_NO_FIRE
+
+	var/const/round_count_file = "data/persistence/round_counts_per_year.json"
+	var/list/round_count_list = list()
+
+
+/datum/subsystem/persistence/New()
+	NEW_SS_GLOBAL(SSpersistence)
+
+/datum/subsystem/persistence/Recover()
+	round_count_list = SSpersistence.round_count_list
+	..()
+
+
+/datum/subsystem/persistence/Initialize(timeofday)
+	read_round_count()
+	..()
+
+/datum/subsystem/persistence/Shutdown()
+	bump_round_count()
+	write_round_count()
+	..()
+
+/datum/subsystem/persistence/proc/read_round_count()
+	if(fexists(round_count_file))
+		round_count_list = json_decode(file2text(round_count_file))
+
+/datum/subsystem/persistence/proc/bump_round_count()
+	var/itsthecurrentyear = time2text(world.realtime,"YY")
+	if(!(itsthecurrentyear in round_count_list))
+		round_count_list[itsthecurrentyear] = "0"
+	round_count_list[itsthecurrentyear] = num2text(text2num(round_count_list[itsthecurrentyear]) + 1)
+
+/datum/subsystem/persistence/proc/write_round_count()
+	var/writing = file(round_count_file)
+	fdel(writing)
+	writing << json_encode(round_count_list)

code/modules/credits/credits.dm

@@ -194,8 +194,8 @@ var/global/datum/credits/end_credits = new
 		rare_episode_name = TRUE
 
 /datum/credits/proc/finalize_episodestring()
-	var/season = rand(1,22)
-	var/episodenum = rand(1,17) //Maybe we could do this cumulatively so that the round after 670 becomes 671 etc and the season is just the last 2 numbers of the current IRL year?
+	var/season = time2text(world.realtime,"YY")
+	var/episodenum = SSpersistence.round_count_list[season]
 	episode_string = "<h1><span id='episodenumber'>SEASON [season] EPISODE [episodenum]</span><br><span id='episodename'>[episode_name]</span></h1><br><div style='padding-bottom: 75px;'></div>"
 	log_game("So ends [is_rerun() ? "another rerun of " : ""]SEASON [season] EPISODE [episodenum] - [episode_name]")
 

data/persistence/round_counts_per_year.json

@@ -0,0 +1 @@
+{"19":"409"}

vgstation13.dme

@@ -217,6 +217,7 @@
 #include "code\controllers\subsystem\init\map.dm"
 #include "code\controllers\subsystem\init\minimaps.dm"
 #include "code\controllers\subsystem\init\more_init_stuff.dm"
+#include "code\controllers\subsystem\init\persistence.dm"
 #include "code\controllers\subsystem\init\rust.dm"
 #include "code\controllers\subsystem\init\spawn_ticker.dm"
 #include "code\controllers\subsystem\init\xenoarch.dm"