Bools and returns super-pr (#53221)

Replaces like 70-80% of 0 and such, as a side effect cleaned up a bunch of returns
Edit: Most left out ones are in mecha which should be done in mecha refactor already
Oh my look how clean it is

Co-authored-by: TiviPlus <TiviPlus>
Co-authored-by: Couls <coul422@gmail.com>

code/__HELPERS/files.dm

@@ -47,12 +47,12 @@
 	var/time_to_wait = GLOB.fileaccess_timer - world.time
 	if(time_to_wait > 0)
 		to_chat(src, "<font color='red'>Error: file_spam_check(): Spam. Please wait [DisplayTimeText(time_to_wait)].</font>")
-		return 1
+		return TRUE
 	var/delay = FTPDELAY
 	if(holder)
 		delay *= ADMIN_FTPDELAY_MODIFIER
 	GLOB.fileaccess_timer = world.time + delay
-	return 0
+	return FALSE
 #undef FTPDELAY
 #undef ADMIN_FTPDELAY_MODIFIER
 

code/__HELPERS/game.dm

@@ -94,8 +94,8 @@
 		if(C == must_be_alone)
 			continue
 		if(our_area == get_area(C))
-			return 0
-	return 1
+			return FALSE
+	return TRUE
 
 //We used to use linear regression to approximate the answer, but Mloc realized this was actually faster.
 //And lo and behold, it is, and it's more accurate to boot.
@@ -263,7 +263,7 @@
 			while(Y1!=Y2)
 				T=locate(X1,Y1,Z)
 				if(IS_OPAQUE_TURF(T))
-					return 0
+					return FALSE
 				Y1+=s
 	else
 		var/m=(32*(Y2-Y1)+(PY2-PY1))/(32*(X2-X1)+(PX2-PX1))
@@ -279,8 +279,8 @@
 				X1+=signX //Line exits tile horizontally
 			T=locate(X1,Y1,Z)
 			if(IS_OPAQUE_TURF(T))
-				return 0
-	return 1
+				return FALSE
+	return TRUE
 #undef SIGNV
 
 
@@ -289,13 +289,9 @@
 	var/turf/Bturf = get_turf(B)
 
 	if(!Aturf || !Bturf)
-		return 0
+		return FALSE
 
-	if(inLineOfSight(Aturf.x,Aturf.y, Bturf.x,Bturf.y,Aturf.z))
-		return 1
-
-	else
-		return 0
+	return inLineOfSight(Aturf.x,Aturf.y, Bturf.x,Bturf.y,Aturf.z)
 
 /proc/try_move_adjacent(atom/movable/AM, trydir)
 	var/turf/T = get_turf(AM)

code/__HELPERS/text.dm

@@ -257,15 +257,15 @@
 /proc/text_in_list(haystack, list/needle_list, start=1, end=0)
 	for(var/needle in needle_list)
 		if(findtext(haystack, needle, start, end))
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 //Like above, but case sensitive
 /proc/text_in_list_case(haystack, list/needle_list, start=1, end=0)
 	for(var/needle in needle_list)
 		if(findtextEx(haystack, needle, start, end))
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 //Adds 'char' ahead of 'text' until there are 'count' characters total
 /proc/add_leading(text, count, char = " ")

code/__HELPERS/unsorted.dm

@@ -669,28 +669,28 @@ GLOBAL_LIST_INIT(WALLITEMS_INVERSE, typecacheof(list(
 			//Direction works sometimes
 			if(is_type_in_typecache(O, GLOB.WALLITEMS_INVERSE))
 				if(O.dir == turn(dir, 180))
-					return 1
+					return TRUE
 			else if(O.dir == dir)
-				return 1
+				return TRUE
 
 			//Some stuff doesn't use dir properly, so we need to check pixel instead
 			//That's exactly what get_turf_pixel() does
 			if(get_turf_pixel(O) == locdir)
-				return 1
+				return TRUE
 
 		if(is_type_in_typecache(O, GLOB.WALLITEMS_EXTERNAL) && check_external)
 			if(is_type_in_typecache(O, GLOB.WALLITEMS_INVERSE))
 				if(O.dir == turn(dir, 180))
-					return 1
+					return TRUE
 			else if(O.dir == dir)
-				return 1
+				return TRUE
 
 	//Some stuff is placed directly on the wallturf (signs)
 	for(var/obj/O in locdir)
 		if(is_type_in_typecache(O, GLOB.WALLITEMS) && check_external != 2)
 			if(O.pixel_x == 0 && O.pixel_y == 0)
-				return 1
-	return 0
+				return TRUE
+	return FALSE
 
 /proc/format_text(text)
 	return replacetext(replacetext(text,"\proper ",""),"\improper ","")
@@ -976,13 +976,13 @@ B --><-- A
 
 /atom/proc/contains(atom/A)
 	if(!A)
-		return 0
+		return FALSE
 	for(var/atom/location = A.loc, location, location = location.loc)
 		if(location == src)
-			return 1
+			return TRUE
 
 /proc/flick_overlay_static(O, atom/A, duration)
-	set waitfor = 0
+	set waitfor = FALSE
 	if(!A || !O)
 		return
 	A.add_overlay(O)

code/_onclick/adjacent.dm

@@ -11,7 +11,7 @@
 	to check that the mob is not inside of something
 */
 /atom/proc/Adjacent(atom/neighbor) // basic inheritance, unused
-	return 0
+	return
 
 // Not a sane use of the function and (for now) indicative of an error elsewhere
 /area/Adjacent(atom/neighbor)
@@ -57,9 +57,9 @@
 		if(!src.ClickCross(get_dir(src,T1), border_only = 1, target_atom = target, mover = mover))
 			continue // could not enter src
 
-		return 1 // we don't care about our own density
+		return TRUE // we don't care about our own density
 
-	return 0
+	return FALSE
 
 /*
 	Adjacency (to anything else):
@@ -78,11 +78,11 @@
 // This is necessary for storage items not on your person.
 /obj/item/Adjacent(atom/neighbor, recurse = 1)
 	if(neighbor == loc)
-		return 1
+		return TRUE
 	if(isitem(loc))
 		if(recurse > 0)
 			return loc.Adjacent(neighbor,recurse - 1)
-		return 0
+		return FALSE
 	return ..()
 
 /*
@@ -99,7 +99,7 @@
 
 		if( O.flags_1&ON_BORDER_1) // windows are on border, check them first
 			if( O.dir & target_dir || O.dir & (O.dir-1) ) // full tile windows are just diagonals mechanically
-				return 0								  //O.dir&(O.dir-1) is false for any cardinal direction, but true for diagonal ones
+				return FALSE								  //O.dir&(O.dir-1) is false for any cardinal direction, but true for diagonal ones
 		else if( !border_only ) // dense, not on border, cannot pass over
-			return 0
-	return 1
+			return FALSE
+	return TRUE

code/_onclick/drag_drop.dm

@@ -78,13 +78,13 @@
 	. = automatic
 
 /atom/proc/IsAutoclickable()
-	. = 1
+	return TRUE
 
 /obj/screen/IsAutoclickable()
-	. = 0
+	return FALSE
 
 /obj/screen/click_catcher/IsAutoclickable()
-	. = 1
+	return TRUE
 
 /client/MouseDrag(src_object,atom/over_object,src_location,over_location,src_control,over_control,params)
 	var/list/L = params2list(params)

code/_onclick/hud/action_button.dm

@@ -40,7 +40,7 @@
 
 /obj/screen/movable/action_button/Click(location,control,params)
 	if (!can_use(usr))
-		return
+		return FALSE
 
 	var/list/modifiers = params2list(params)
 	if(modifiers["shift"])
@@ -68,7 +68,7 @@
 	desc = "Shift-click any button to reset its position, and Control-click it to lock it in place. Alt-click this button to reset all buttons to their default positions."
 	icon = 'icons/mob/actions.dmi'
 	icon_state = "bg_default"
-	var/hidden = 0
+	var/hidden = FALSE
 	var/hide_icon = 'icons/mob/actions.dmi'
 	var/hide_state = "hide"
 	var/show_state = "show"
@@ -78,7 +78,7 @@
 /obj/screen/movable/action_button/hide_toggle/Initialize()
 	. = ..()
 	var/static/list/icon_cache = list()
-	
+
 	var/cache_key = "[hide_icon][hide_state]"
 	hide_appearance = icon_cache[cache_key]
 	if(!hide_appearance)

code/_onclick/hud/pai.dm

@@ -83,14 +83,15 @@
 	required_software = "host scan"
 
 /obj/screen/pai/host_monitor/Click()
-	if(!..())
+	. = ..()
+	if(!.)
 		return
 	var/mob/living/silicon/pai/pAI = usr
 	if(iscarbon(pAI.card.loc))
 		pAI.hostscan.attack(pAI.card.loc, pAI)
 	else
 		to_chat(src, "<span class='warning'>You are not being carried by anyone!</span>")
-		return 0
+		return FALSE
 
 /obj/screen/pai/crew_manifest
 	name = "Crew Manifest"

code/_onclick/other_mobs.dm

@@ -81,7 +81,7 @@
 */
 
 /mob/living/carbon/RestrainedClickOn(atom/A)
-	return 0
+	return
 
 /mob/living/carbon/human/RangedAttack(atom/A, mouseparams)
 	. = ..()

code/controllers/failsafe.dm

@@ -31,7 +31,7 @@ GLOBAL_REAL(Failsafe, /datum/controller/failsafe)
 	Initialize()
 
 /datum/controller/failsafe/Initialize()
-	set waitfor = 0
+	set waitfor = FALSE
 	Failsafe.Loop()
 	if(!QDELETED(src))
 		qdel(src) //when Loop() returns, we delete ourselves and let the mc recreate us

code/controllers/globals.dm

@@ -22,13 +22,13 @@ GLOBAL_REAL(GLOB, /datum/controller/global_vars)
 
 /datum/controller/global_vars/Destroy(force)
 	// This is done to prevent an exploit where admins can get around protected vars
-	SHOULD_CALL_PARENT(0)
+	SHOULD_CALL_PARENT(FALSE)
 	return QDEL_HINT_IWILLGC
 
 /datum/controller/global_vars/stat_entry()
 	if(!statclick)
 		statclick = new/obj/effect/statclick/debug(null, "Initializing...", src)
-	
+
 	stat("Globals:", statclick.update("Edit"))
 
 /datum/controller/global_vars/vv_edit_var(var_name, var_value)

code/controllers/master.dm

@@ -39,7 +39,7 @@ GLOBAL_REAL(Master, /datum/controller/master) = new
 	///Only run ticker subsystems for the next n ticks.
 	var/skip_ticks = 0
 
-	var/make_runtime = 0
+	var/make_runtime = FALSE
 
 	var/initializations_finished_with_no_players_logged_in	//I wonder what this could be?
 

code/controllers/subsystem.dm

@@ -23,7 +23,7 @@
 	var/priority = FIRE_PRIORITY_DEFAULT
 
 	/// [Subsystem Flags][SS_NO_INIT] to control binary behavior. Flags must be set at compile time or before preinit finishes to take full effect. (You can also restart the mc to force them to process again)
-	var/flags = 0
+	var/flags = NONE
 
 	/// This var is set to TRUE after the subsystem has been initialized.
 	var/initialized = FALSE

code/controllers/subsystem/acid.dm

@@ -12,7 +12,7 @@ SUBSYSTEM_DEF(acid)
 	return ..()
 
 
-/datum/controller/subsystem/acid/fire(resumed = 0)
+/datum/controller/subsystem/acid/fire(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = processing.Copy()
 

code/controllers/subsystem/air.dm

@@ -70,7 +70,7 @@ SUBSYSTEM_DEF(air)
 	return ..()
 
 
-/datum/controller/subsystem/air/fire(resumed = 0)
+/datum/controller/subsystem/air/fire(resumed = FALSE)
 	var/timer = TICK_USAGE_REAL
 
 	if(currentpart == SSAIR_REBUILD_PIPENETS)
@@ -90,7 +90,7 @@ SUBSYSTEM_DEF(air)
 		cost_pipenets = MC_AVERAGE(cost_pipenets, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_ATMOSMACHINERY
 
 	if(currentpart == SSAIR_ATMOSMACHINERY)
@@ -99,7 +99,7 @@ SUBSYSTEM_DEF(air)
 		cost_atmos_machinery = MC_AVERAGE(cost_atmos_machinery, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_ACTIVETURFS
 
 	if(currentpart == SSAIR_ACTIVETURFS)
@@ -108,7 +108,7 @@ SUBSYSTEM_DEF(air)
 		cost_turfs = MC_AVERAGE(cost_turfs, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_EXCITEDGROUPS
 
 	if(currentpart == SSAIR_EXCITEDGROUPS)
@@ -117,7 +117,7 @@ SUBSYSTEM_DEF(air)
 		cost_groups = MC_AVERAGE(cost_groups, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_HIGHPRESSURE
 
 	if(currentpart == SSAIR_HIGHPRESSURE)
@@ -126,7 +126,7 @@ SUBSYSTEM_DEF(air)
 		cost_highpressure = MC_AVERAGE(cost_highpressure, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_HOTSPOTS
 
 	if(currentpart == SSAIR_HOTSPOTS)
@@ -135,7 +135,7 @@ SUBSYSTEM_DEF(air)
 		cost_hotspots = MC_AVERAGE(cost_hotspots, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 		currentpart = SSAIR_SUPERCONDUCTIVITY
 
 	if(currentpart == SSAIR_SUPERCONDUCTIVITY)
@@ -144,13 +144,13 @@ SUBSYSTEM_DEF(air)
 		cost_superconductivity = MC_AVERAGE(cost_superconductivity, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 		if(state != SS_RUNNING)
 			return
-		resumed = 0
+		resumed = FALSE
 	currentpart = SSAIR_REBUILD_PIPENETS
 
 	SStgui.update_uis(SSair) //Lightning fast debugging motherfucker
 
 
-/datum/controller/subsystem/air/proc/process_pipenets(resumed = 0)
+/datum/controller/subsystem/air/proc/process_pipenets(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = networks.Copy()
 	//cache for sanic speed (lists are references anyways)
@@ -169,7 +169,7 @@ SUBSYSTEM_DEF(air)
 	if(istype(atmos_machine, /obj/machinery/atmospherics))
 		pipenets_needing_rebuilt += atmos_machine
 
-/datum/controller/subsystem/air/proc/process_atmos_machinery(resumed = 0)
+/datum/controller/subsystem/air/proc/process_atmos_machinery(resumed = FALSE)
 	var/seconds = wait * 0.1
 	if (!resumed)
 		src.currentrun = atmos_machinery.Copy()
@@ -184,7 +184,7 @@ SUBSYSTEM_DEF(air)
 			return
 
 
-/datum/controller/subsystem/air/proc/process_super_conductivity(resumed = 0)
+/datum/controller/subsystem/air/proc/process_super_conductivity(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = active_super_conductivity.Copy()
 	//cache for sanic speed (lists are references anyways)
@@ -196,7 +196,7 @@ SUBSYSTEM_DEF(air)
 		if(MC_TICK_CHECK)
 			return
 
-/datum/controller/subsystem/air/proc/process_hotspots(resumed = 0)
+/datum/controller/subsystem/air/proc/process_hotspots(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = hotspots.Copy()
 	//cache for sanic speed (lists are references anyways)
@@ -212,7 +212,7 @@ SUBSYSTEM_DEF(air)
 			return
 
 
-/datum/controller/subsystem/air/proc/process_high_pressure_delta(resumed = 0)
+/datum/controller/subsystem/air/proc/process_high_pressure_delta(resumed = FALSE)
 	while (high_pressure_delta.len)
 		var/turf/open/T = high_pressure_delta[high_pressure_delta.len]
 		high_pressure_delta.len--
@@ -221,7 +221,7 @@ SUBSYSTEM_DEF(air)
 		if(MC_TICK_CHECK)
 			return
 
-/datum/controller/subsystem/air/proc/process_active_turfs(resumed = 0)
+/datum/controller/subsystem/air/proc/process_active_turfs(resumed = FALSE)
 	//cache for sanic speed
 	var/fire_count = times_fired
 	if (!resumed)
@@ -236,7 +236,7 @@ SUBSYSTEM_DEF(air)
 		if (MC_TICK_CHECK)
 			return
 
-/datum/controller/subsystem/air/proc/process_excited_groups(resumed = 0)
+/datum/controller/subsystem/air/proc/process_excited_groups(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = excited_groups.Copy()
 	//cache for sanic speed (lists are references anyways)
@@ -262,7 +262,7 @@ SUBSYSTEM_DEF(air)
 	T.remove_atom_colour(TEMPORARY_COLOUR_PRIORITY, COLOR_VIBRANT_LIME)
 	#endif
 	if(istype(T))
-		T.excited = 0
+		T.excited = FALSE
 		if(T.excited_group)
 			T.excited_group.garbage_collect()
 
@@ -271,7 +271,7 @@ SUBSYSTEM_DEF(air)
 		#ifdef VISUALIZE_ACTIVE_TURFS
 		T.add_atom_colour(COLOR_VIBRANT_LIME, TEMPORARY_COLOUR_PRIORITY)
 		#endif
-		T.excited = 1
+		T.excited = TRUE
 		active_turfs |= T
 		if(currentpart == SSAIR_ACTIVETURFS)
 			currentrun |= T
@@ -370,7 +370,7 @@ SUBSYSTEM_DEF(air)
 		else
 			EG.add_turf(ET)
 		if (!ET.excited)
-			ET.excited = 1
+			ET.excited = TRUE
 			. += ET
 /turf/open/space/resolve_active_graph()
 	return list()

code/controllers/subsystem/discord.dm

@@ -42,14 +42,14 @@ SUBSYSTEM_DEF(discord)
 	var/list/reverify_cache = list()
 	var/notify_file = file("data/notify.json")
 	/// Is TGS enabled (If not we won't fire because otherwise this is useless)
-	var/enabled = 0
+	var/enabled = FALSE
 
 /datum/controller/subsystem/discord/Initialize(start_timeofday)
 	// Check for if we are using TGS, otherwise return and disables firing
 	if(world.TgsAvailable())
-		enabled = 1 // Allows other procs to use this (Account linking, etc)
+		enabled = TRUE // Allows other procs to use this (Account linking, etc)
 	else
-		can_fire = 0 // We dont want excess firing
+		can_fire = FALSE // We dont want excess firing
 		return ..() // Cancel
 
 	try

code/controllers/subsystem/events.dm

@@ -25,7 +25,7 @@ SUBSYSTEM_DEF(events)
 	return ..()
 
 
-/datum/controller/subsystem/events/fire(resumed = 0)
+/datum/controller/subsystem/events/fire(resumed = FALSE)
 	if(!resumed)
 		checkEvent() //only check these if we aren't resuming a paused fire
 		src.currentrun = running.Copy()

code/controllers/subsystem/ipintel.dm

@@ -2,13 +2,13 @@ SUBSYSTEM_DEF(ipintel)
 	name = "XKeyScore"
 	init_order = INIT_ORDER_XKEYSCORE
 	flags = SS_NO_FIRE
-	var/enabled = 0 //disable at round start to avoid checking reconnects
+	var/enabled = FALSE //disable at round start to avoid checking reconnects
 	var/throttle = 0
 	var/errors = 0
 
 	var/list/cache = list()
 
 /datum/controller/subsystem/ipintel/Initialize(timeofday, zlevel)
-	enabled = 1
+	enabled = TRUE
 	. = ..()
 

code/controllers/subsystem/job.dm

@@ -45,7 +45,7 @@ SUBSYSTEM_DEF(job)
 	var/list/all_jobs = subtypesof(/datum/job)
 	if(!all_jobs.len)
 		to_chat(world, "<span class='boldannounce'>Error setting up jobs, no job datums found</span>")
-		return 0
+		return FALSE
 
 	for(var/J in all_jobs)
 		var/datum/job/job = new J()
@@ -62,7 +62,7 @@ SUBSYSTEM_DEF(job)
 		name_occupations[job.title] = job
 		type_occupations[J] = job
 
-	return 1
+	return TRUE
 
 
 /datum/controller/subsystem/job/proc/GetJob(rank)
@@ -189,8 +189,8 @@ SUBSYSTEM_DEF(job)
 				continue
 			var/mob/dead/new_player/candidate = pick(candidates)
 			if(AssignRole(candidate, command_position))
-				return 1
-	return 0
+				return TRUE
+	return FALSE
 
 
 //This proc is called at the start of the level loop of DivideOccupations() and will cause head jobs to be checked before any other jobs of the same level
@@ -209,10 +209,10 @@ SUBSYSTEM_DEF(job)
 		AssignRole(candidate, command_position)
 
 /datum/controller/subsystem/job/proc/FillAIPosition()
-	var/ai_selected = 0
+	var/ai_selected = FALSE
 	var/datum/job/job = GetJob("AI")
 	if(!job)
-		return 0
+		return FALSE
 	for(var/i = job.total_positions, i > 0, i--)
 		for(var/level in level_order)
 			var/list/candidates = list()
@@ -223,8 +223,8 @@ SUBSYSTEM_DEF(job)
 					ai_selected++
 					break
 	if(ai_selected)
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 
 /** Proc DivideOccupations

code/controllers/subsystem/machines.dm

@@ -27,7 +27,7 @@ SUBSYSTEM_DEF(machines)
 	return ..()
 
 
-/datum/controller/subsystem/machines/fire(resumed = 0)
+/datum/controller/subsystem/machines/fire(resumed = FALSE)
 	if (!resumed)
 		for(var/datum/powernet/Powernet in powernets)
 			Powernet.reset() //reset the power state.

code/controllers/subsystem/mobs.dm

@@ -24,7 +24,7 @@ SUBSYSTEM_DEF(mobs)
 		dead_players_by_zlevel.len++
 		dead_players_by_zlevel[dead_players_by_zlevel.len] = list()
 
-/datum/controller/subsystem/mobs/fire(resumed = 0)
+/datum/controller/subsystem/mobs/fire(resumed = FALSE)
 	var/seconds = wait * 0.1
 	if (!resumed)
 		src.currentrun = GLOB.mob_living_list.Copy()

code/controllers/subsystem/pai.dm

@@ -68,7 +68,7 @@ SUBSYSTEM_DEF(pai)
 
 			if("submit")
 				if(candidate)
-					candidate.ready = 1
+					candidate.ready = TRUE
 					for(var/obj/item/paicard/p in pai_card_list)
 						if(!p.pai)
 							p.alertUpdate()
@@ -195,4 +195,4 @@ SUBSYSTEM_DEF(pai)
 	var/description
 	var/role
 	var/comments
-	var/ready = 0
+	var/ready = FALSE

code/controllers/subsystem/processing/processing.dm

@@ -14,7 +14,7 @@ SUBSYSTEM_DEF(processing)
 	msg = "[stat_tag]:[length(processing)]"
 	return ..()
 
-/datum/controller/subsystem/processing/fire(resumed = 0)
+/datum/controller/subsystem/processing/fire(resumed = FALSE)
 	if (!resumed)
 		currentrun = processing.Copy()
 	//cache for sanic speed (lists are references anyways)
@@ -34,5 +34,5 @@ SUBSYSTEM_DEF(processing)
 
 ///This proc is called on a datum if it is being processed in a subsystem. If you override this do not call parent, as it will return PROCESS_KILL. This is done to prevent objects that dont override process() from staying in the processing list
 /datum/proc/process()
-	set waitfor = 0
+	set waitfor = FALSE
 	return PROCESS_KILL

code/controllers/subsystem/shuttle.dm

@@ -303,7 +303,7 @@ SUBSYSTEM_DEF(shuttle)
 	if (!SSticker.IsRoundInProgress())
 		return
 
-	var/callShuttle = 1
+	var/callShuttle = TRUE
 
 	for(var/thing in GLOB.shuttle_caller_list)
 		if(isAI(thing))
@@ -319,7 +319,7 @@ SUBSYSTEM_DEF(shuttle)
 
 		var/turf/T = get_turf(thing)
 		if(T && is_station_level(T.z))
-			callShuttle = 0
+			callShuttle = FALSE
 			break
 
 	if(callShuttle)

code/controllers/subsystem/spacedrift.dm

@@ -13,7 +13,7 @@ SUBSYSTEM_DEF(spacedrift)
 	return ..()
 
 
-/datum/controller/subsystem/spacedrift/fire(resumed = 0)
+/datum/controller/subsystem/spacedrift/fire(resumed = FALSE)
 	if (!resumed)
 		src.currentrun = processing.Copy()
 

code/controllers/subsystem/tgui.dm

@@ -33,7 +33,7 @@ SUBSYSTEM_DEF(tgui)
 	msg = "P:[length(open_uis)]"
 	return ..()
 
-/datum/controller/subsystem/tgui/fire(resumed = 0)
+/datum/controller/subsystem/tgui/fire(resumed = FALSE)
 	if(!resumed)
 		src.current_run = open_uis.Copy()
 	// Cache for sanic speed (lists are references anyways)

code/controllers/subsystem/ticker.dm

@@ -14,7 +14,7 @@ SUBSYSTEM_DEF(ticker)
 	var/start_immediately = FALSE
 	var/setup_done = FALSE //All game setup done including mode post setup and
 
-	var/hide_mode = 0
+	var/hide_mode = FALSE
 	var/datum/game_mode/mode = null
 
 	var/login_music							//music played in pregame lobby
@@ -23,7 +23,7 @@ SUBSYSTEM_DEF(ticker)
 
 	var/list/datum/mind/minds = list()		//The characters in the game. Used for objective tracking.
 
-	var/delay_end = 0						//if set true, the round will not restart on it's own
+	var/delay_end = FALSE						//if set true, the round will not restart on it's own
 	var/admin_delay_notice = ""				//a message to display to anyone who tries to restart the world after a delay
 	var/ready_for_reboot = FALSE			//all roundend preparation done with, all that's left is reboot
 
@@ -32,7 +32,7 @@ SUBSYSTEM_DEF(ticker)
 	///Boolean to see if the game needs to set up a triumvirate ai (see tripAI.dm)
 	var/triai = FALSE
 
-	var/tipped = 0							//Did we broadcast the tip of the day yet?
+	var/tipped = FALSE							//Did we broadcast the tip of the day yet?
 	var/selected_tip						// What will be the tip of the day?
 
 	var/timeLeft						//pregame timer
@@ -227,7 +227,7 @@ SUBSYSTEM_DEF(ticker)
 		if(!mode)
 			if(!runnable_modes.len)
 				to_chat(world, "<B>Unable to choose playable game mode.</B> Reverting to pre-game lobby.")
-				return 0
+				return FALSE
 			mode = pickweight(runnable_modes)
 			if(!mode)	//too few roundtypes all run too recently
 				mode = pick(runnable_modes)
@@ -239,7 +239,7 @@ SUBSYSTEM_DEF(ticker)
 			qdel(mode)
 			mode = null
 			SSjob.ResetOccupations()
-			return 0
+			return FALSE
 
 	CHECK_TICK
 	//Configure mode and assign player to special mode stuff
@@ -255,7 +255,7 @@ SUBSYSTEM_DEF(ticker)
 			QDEL_NULL(mode)
 			to_chat(world, "<B>Error setting up [GLOB.master_mode].</B> Reverting to pre-game lobby.")
 			SSjob.ResetOccupations()
-			return 0
+			return FALSE
 	else
 		message_admins("<span class='notice'>DEBUG: Bypassing prestart checks...</span>")
 

code/datums/action.dm

@@ -168,12 +168,13 @@
 	return ..()
 
 /datum/action/item_action/Trigger()
-	if(!..())
-		return 0
+	. = ..()
+	if(!.)
+		return FALSE
 	if(target)
 		var/obj/item/I = target
 		I.ui_action_click(owner, src)
-	return 1
+	return TRUE
 
 /datum/action/item_action/ApplyIcon(obj/screen/movable/action_button/current_button, force)
 	if(button_icon && button_icon_state)
@@ -315,7 +316,7 @@
 	if(istype(target, /obj/item/hierophant_club))
 		var/obj/item/hierophant_club/H = target
 		if(H.teleporting)
-			return 0
+			return FALSE
 	return ..()
 
 /datum/action/item_action/toggle_helmet_flashlight
@@ -384,7 +385,7 @@
 /datum/action/item_action/jetpack_stabilization/IsAvailable()
 	var/obj/item/tank/jetpack/J = target
 	if(!istype(J) || !J.on)
-		return 0
+		return FALSE
 	return ..()
 
 /datum/action/item_action/hands_free
@@ -439,7 +440,7 @@
 /datum/action/item_action/organ_action/IsAvailable()
 	var/obj/item/organ/I = target
 	if(!I.owner)
-		return 0
+		return FALSE
 	return ..()
 
 /datum/action/item_action/organ_action/toggle/New(Target)
@@ -586,12 +587,12 @@
 
 /datum/action/innate/Trigger()
 	if(!..())
-		return 0
+		return FALSE
 	if(!active)
 		Activate()
 	else
 		Deactivate()
-	return 1
+	return TRUE
 
 /datum/action/innate/proc/Activate()
 	return

code/datums/browser.dm

@@ -198,7 +198,7 @@
 	opentime = 0
 
 /datum/browser/modal/open(use_onclose)
-	set waitfor = 0
+	set waitfor = FALSE
 	opentime = world.time
 
 	if (stealfocus)

code/datums/components/honkspam.dm

@@ -2,9 +2,10 @@
 // used ONLY on april's fool.  I moved it to a component so it could be
 // used in other places
 
+//This is copypasted on other obj so if you are readin this go refactor it, start on objs with var/limiting_spam
 /datum/component/honkspam
 	dupe_mode = COMPONENT_DUPE_UNIQUE
-	var/spam_flag = FALSE
+	var/limiting_spam = FALSE
 
 /datum/component/honkspam/Initialize()
 	if(!isitem(parent))
@@ -12,11 +13,11 @@
 	RegisterSignal(parent, COMSIG_ITEM_ATTACK_SELF, .proc/interact)
 
 /datum/component/honkspam/proc/reset_spamflag()
-	spam_flag = FALSE
+	limiting_spam = FALSE
 
 /datum/component/honkspam/proc/interact(mob/user)
-	if(!spam_flag)
-		spam_flag = TRUE
+	if(!limiting_spam)
+		limiting_spam = TRUE
 		var/obj/item/parent_item = parent
 		playsound(parent_item.loc, 'sound/items/bikehorn.ogg', 50, TRUE)
 		addtimer(CALLBACK(src, .proc/reset_spamflag), 2 SECONDS)

code/datums/components/mood.dm

@@ -257,7 +257,7 @@
 		else
 			if(the_event.timeout)
 				addtimer(CALLBACK(src, .proc/clear_event, null, category), the_event.timeout, TIMER_UNIQUE|TIMER_OVERRIDE)
-			return 0 //Don't have to update the event.
+			return //Don't have to update the event.
 	var/list/params = args.Copy(4)
 	params.Insert(1, parent)
 	the_event = new type(arglist(params))
@@ -276,7 +276,7 @@
 		category = REF(category)
 	var/datum/mood_event/event = mood_events[category]
 	if(!event)
-		return 0
+		return
 
 	mood_events -= category
 	qdel(event)

code/datums/components/spawner.dm

@@ -40,9 +40,9 @@
 /datum/component/spawner/proc/try_spawn_mob()
 	var/atom/P = parent
 	if(spawned_mobs.len >= max_mobs)
-		return 0
+		return
 	if(spawn_delay > world.time)
-		return 0
+		return
 	spawn_delay = world.time + spawn_time
 	var/chosen_mob_type = pick(mob_types)
 	var/mob/living/simple_animal/L = new chosen_mob_type(P.loc)

code/datums/components/summoning.dm

@@ -52,11 +52,11 @@
 
 /datum/component/summoning/proc/do_spawn_mob(atom/spawn_location, summoner)
 	if(spawned_mobs.len >= max_mobs)
-		return 0
+		return
 	if(last_spawned_time > world.time)
-		return 0
+		return
 	if(!prob(spawn_chance))
-		return 0
+		return
 	last_spawned_time = world.time + spawn_delay
 	var/chosen_mob_type = pick(mob_types)
 	var/mob/living/simple_animal/L = new chosen_mob_type(spawn_location)

code/datums/datum.dm

@@ -92,7 +92,7 @@
   * Returns [QDEL_HINT_QUEUE]
   */
 /datum/proc/Destroy(force=FALSE, ...)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	tag = null
 	datum_flags &= ~DF_USE_TAG //In case something tries to REF us
 	weak_reference = null	//ensure prompt GCing of weakref.

code/datums/diseases/advance/advance.dm

@@ -136,11 +136,11 @@
 /datum/disease/advance/IsSame(datum/disease/advance/D)
 
 	if(!(istype(D, /datum/disease/advance)))
-		return 0
+		return FALSE
 
 	if(GetDiseaseID() != D.GetDiseaseID())
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 // Returns the advance disease with a different reference memory.
 /datum/disease/advance/Copy()
@@ -178,8 +178,8 @@
 /datum/disease/advance/proc/HasSymptom(datum/symptom/S)
 	for(var/datum/symptom/symp in symptoms)
 		if(symp.type == S.type)
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 // Will generate new unique symptoms, use this if there are none. Returns a list of symptoms that were generated.
 /datum/disease/advance/proc/GenerateSymptoms(level_min, level_max, amount_get = 0)

code/datums/diseases/transformation.dm

@@ -110,7 +110,7 @@
 	desc = "Monkeys with this disease will bite humans, causing humans to mutate into a monkey."
 	severity = DISEASE_SEVERITY_BIOHAZARD
 	stage_prob = 4
-	visibility_flags = 0
+	visibility_flags = NONE
 	agent = "Kongey Vibrion M-909"
 	new_form = /mob/living/carbon/monkey
 	bantype = ROLE_MONKEY
@@ -172,7 +172,7 @@
 	agent = "R2D2 Nanomachines"
 	desc = "This disease, actually acute nanomachine infection, converts the victim into a cyborg."
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list()
 	stage2	= list("Your joints feel stiff.", "<span class='danger'>Beep...boop..</span>")
 	stage3	= list("<span class='danger'>Your joints feel very stiff.</span>", "Your skin feels loose.", "<span class='danger'>You can feel something move...inside.</span>")
@@ -209,7 +209,7 @@
 	agent = "Rip-LEY Alien Microbes"
 	desc = "This disease changes the victim into a xenomorph."
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list()
 	stage2	= list("Your throat feels scratchy.", "<span class='danger'>Kill...</span>")
 	stage3	= list("<span class='danger'>Your throat feels very scratchy.</span>", "Your skin feels tight.", "<span class='danger'>You can feel something move...inside.</span>")
@@ -242,7 +242,7 @@
 	agent = "Advanced Mutation Toxin"
 	desc = "This highly concentrated extract converts anything into more of itself."
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list("You don't feel very well.")
 	stage2	= list("Your skin feels a little slimy.")
 	stage3	= list("<span class='danger'>Your appendages are melting away.</span>", "<span class='danger'>Your limbs begin to lose their shape.</span>")
@@ -275,7 +275,7 @@
 	agent = "Fell Doge Majicks"
 	desc = "This disease transforms the victim into a corgi."
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list("BARK.")
 	stage2	= list("You feel the need to wear silly hats.")
 	stage3	= list("<span class='danger'>Must... eat... chocolate....</span>", "<span class='danger'>YAP</span>")
@@ -305,7 +305,7 @@
 	desc = "A 'gift' from somewhere terrible."
 	stage_prob = 20
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list("Your stomach rumbles.")
 	stage2	= list("Your skin feels saggy.")
 	stage3	= list("<span class='danger'>Your appendages are melting away.</span>", "<span class='danger'>Your limbs begin to lose their shape.</span>")
@@ -324,7 +324,7 @@
 	agent = "Tranquility"
 	desc = "Consuming the flesh of a Gondola comes at a terrible price."
 	severity = DISEASE_SEVERITY_BIOHAZARD
-	visibility_flags = 0
+	visibility_flags = NONE
 	stage1	= list("You seem a little lighter in your step.")
 	stage2	= list("You catch yourself smiling for no reason.")
 	stage3	= list("<span class='danger'>A cruel sense of calm overcomes you.</span>", "<span class='danger'>You can't feel your arms!</span>", "<span class='danger'>You let go of the urge to hurt clowns.</span>")

code/datums/dna.dm

@@ -221,8 +221,8 @@
 /datum/dna/proc/is_same_as(datum/dna/D)
 	if(uni_identity == D.uni_identity && mutation_index == D.mutation_index && real_name == D.real_name)
 		if(species.type == D.species.type && features == D.features && blood_type == D.blood_type)
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 /datum/dna/proc/update_instability(alert=TRUE)
 	stability = 100
@@ -438,7 +438,7 @@
 
 /datum/dna/proc/check_block_string(mutation)
 	if((LAZYLEN(mutation_index) > DNA_MUTATION_BLOCKS) || !(mutation in mutation_index))
-		return 0
+		return FALSE
 	return is_gene_active(mutation)
 
 /datum/dna/proc/is_gene_active(mutation)
@@ -549,7 +549,7 @@
 
 /proc/scramble_dna(mob/living/carbon/M, ui=FALSE, se=FALSE, probability)
 	if(!M.has_dna())
-		return 0
+		return FALSE
 	if(se)
 		for(var/i=1, i<=DNA_MUTATION_BLOCKS, i++)
 			if(prob(probability))
@@ -560,7 +560,7 @@
 			if(prob(probability))
 				M.dna.uni_identity = setblock(M.dna.uni_identity, i, random_string(DNA_BLOCK_SIZE, GLOB.hex_characters))
 		M.updateappearance(mutations_overlay_update=1)
-	return 1
+	return TRUE
 
 //value in range 1 to values. values must be greater than 0
 //all arguments assumed to be positive integers

code/datums/elements/_element.dm

@@ -18,7 +18,7 @@
 
 /// Activates the functionality defined by the element on the given target datum
 /datum/element/proc/Attach(datum/target)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	if(type == /datum/element)
 		return ELEMENT_INCOMPATIBLE
 	SEND_SIGNAL(target, COMSIG_ELEMENT_ATTACH, src)
@@ -30,7 +30,7 @@
 	SIGNAL_HANDLER
 
 	SEND_SIGNAL(source, COMSIG_ELEMENT_DETACH, src)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	UnregisterSignal(source, COMSIG_PARENT_QDELETING)
 
 /datum/element/Destroy(force)

code/datums/martial/boxing.dm

@@ -23,7 +23,7 @@
 						"<span class='danger'>You avoid [A]'s [atk_verb]!</span>", "<span class='hear'>You hear a swoosh!</span>", COMBAT_MESSAGE_RANGE, A)
 		to_chat(A, "<span class='warning'>Your [atk_verb] misses [D]!</span>")
 		log_combat(A, D, "attempted to hit", atk_verb)
-		return 0
+		return FALSE
 
 
 	var/obj/item/bodypart/affecting = D.get_bodypart(ran_zone(A.zone_selected))
@@ -46,7 +46,7 @@
 			D.apply_effect(200,EFFECT_KNOCKDOWN,armor_block)
 			D.SetSleeping(100)
 			log_combat(A, D, "knocked out (boxing) ")
-	return 1
+	return TRUE
 
 /obj/item/clothing/gloves/boxing
 	var/datum/martial_art/boxing/style = new

code/datums/martial/krav_maga.dm

@@ -75,20 +75,20 @@
 		if("neck_chop")
 			streak = ""
 			neck_chop(A,D)
-			return 1
+			return TRUE
 		if("leg_sweep")
 			streak = ""
 			leg_sweep(A,D)
-			return 1
+			return TRUE
 		if("quick_choke")//is actually lung punch
 			streak = ""
 			quick_choke(A,D)
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 /datum/martial_art/krav_maga/proc/leg_sweep(mob/living/carbon/human/A, mob/living/carbon/human/D)
 	if(D.stat || D.IsParalyzed())
-		return 0
+		return FALSE
 	var/obj/item/bodypart/affecting = D.get_bodypart(BODY_ZONE_CHEST)
 	var/armor_block = D.run_armor_check(affecting, MELEE)
 	D.visible_message("<span class='warning'>[A] leg sweeps [D]!</span>", \
@@ -98,7 +98,7 @@
 	D.apply_damage(rand(20,30), STAMINA, affecting, armor_block)
 	D.Knockdown(60)
 	log_combat(A, D, "leg sweeped")
-	return 1
+	return TRUE
 
 /datum/martial_art/krav_maga/proc/quick_choke(mob/living/carbon/human/A, mob/living/carbon/human/D)//is actually lung punch
 	D.visible_message("<span class='warning'>[A] pounds [D] on the chest!</span>", \
@@ -109,7 +109,7 @@
 		D.losebreath = clamp(D.losebreath + 5, 0, 10)
 	D.adjustOxyLoss(10)
 	log_combat(A, D, "quickchoked")
-	return 1
+	return TRUE
 
 /datum/martial_art/krav_maga/proc/neck_chop(mob/living/carbon/human/A, mob/living/carbon/human/D)
 	D.visible_message("<span class='warning'>[A] karate chops [D]'s neck!</span>", \
@@ -120,17 +120,17 @@
 	if(D.silent <= 10)
 		D.silent = clamp(D.silent + 10, 0, 10)
 	log_combat(A, D, "neck chopped")
-	return 1
+	return TRUE
 
 /datum/martial_art/krav_maga/grab_act(mob/living/carbon/human/A, mob/living/carbon/human/D)
 	if(check_streak(A,D))
-		return 1
+		return TRUE
 	log_combat(A, D, "grabbed (Krav Maga)")
 	..()
 
 /datum/martial_art/krav_maga/harm_act(mob/living/carbon/human/A, mob/living/carbon/human/D)
 	if(check_streak(A,D))
-		return 1
+		return TRUE
 	log_combat(A, D, "punched")
 	var/obj/item/bodypart/affecting = D.get_bodypart(ran_zone(A.zone_selected))
 	var/armor_block = D.run_armor_check(affecting, MELEE)
@@ -150,11 +150,11 @@
 					"<span class='userdanger'>You're [picked_hit_type]ed by [A]!</span>", "<span class='hear'>You hear a sickening sound of flesh hitting flesh!</span>", COMBAT_MESSAGE_RANGE, A)
 	to_chat(A, "<span class='danger'>You [picked_hit_type] [D]!</span>")
 	log_combat(A, D, "[picked_hit_type] with [name]")
-	return 1
+	return TRUE
 
 /datum/martial_art/krav_maga/disarm_act(mob/living/carbon/human/A, mob/living/carbon/human/D)
 	if(check_streak(A,D))
-		return 1
+		return TRUE
 	var/obj/item/bodypart/affecting = D.get_bodypart(ran_zone(A.zone_selected))
 	var/armor_block = D.run_armor_check(affecting, MELEE)
 	if((D.mobility_flags & MOBILITY_STAND))
@@ -176,7 +176,7 @@
 	if(prob(D.getStaminaLoss()))
 		D.visible_message("<span class='warning'>[D] sputters and recoils in pain!</span>", "<span class='userdanger'>You recoil in pain as you are jabbed in a nerve!</span>")
 		D.drop_all_held_items()
-	return 1
+	return TRUE
 
 //Krav Maga Gloves
 

code/datums/martial/wrestling.dm

@@ -22,24 +22,24 @@
 		if("drop")
 			streak = ""
 			drop(A,D)
-			return 1
+			return TRUE
 		if("strike")
 			streak = ""
 			strike(A,D)
-			return 1
+			return TRUE
 		if("kick")
 			streak = ""
 			kick(A,D)
-			return 1
+			return TRUE
 		if("throw")
 			streak = ""
 			throw_wrassle(A,D)
-			return 1
+			return TRUE
 		if("slam")
 			streak = ""
 			slam(A,D)
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 /datum/action/slam
 	name = "Slam (Cinch) - Slam a grappled opponent into the floor."
@@ -158,11 +158,11 @@
 
 			if (get_dist(A, D) > 1)
 				to_chat(A, "<span class='warning'>[D] is too far away!</span>")
-				return 0
+				return
 
 			if (!isturf(A.loc) || !isturf(D.loc))
 				to_chat(A, "<span class='warning'>You can't throw [D] from here!</span>")
-				return 0
+				return
 
 			A.setDir(turn(A.dir, 90))
 			var/turf/T = get_step(A, A.dir)
@@ -171,7 +171,7 @@
 				D.forceMove(T)
 				D.setDir(get_dir(D, A))
 		else
-			return 0
+			return
 
 		sleep(delay)
 
@@ -180,11 +180,11 @@
 
 		if (get_dist(A, D) > 1)
 			to_chat(A, "<span class='warning'>[D] is too far away!</span>")
-			return 0
+			return
 
 		if (!isturf(A.loc) || !isturf(D.loc))
 			to_chat(A, "<span class='warning'>You can't throw [D] from here!</span>")
-			return 0
+			return
 
 		D.forceMove(A.loc) // Maybe this will help with the wallthrowing bug.
 
@@ -198,7 +198,7 @@
 				D.emote("scream")
 			D.throw_at(T, 10, 4, A, TRUE, TRUE, callback = CALLBACK(D, /mob/living/carbon/human.proc/Paralyze, 20))
 	log_combat(A, D, "has thrown with wrestling")
-	return 0
+	return
 
 /datum/martial_art/wrestling/proc/FlipAnimation(mob/living/carbon/human/D)
 	set waitfor = FALSE
@@ -247,7 +247,7 @@
 				A.pixel_y = 0
 				D.pixel_x = 0
 				D.pixel_y = 0
-				return 0
+				return
 
 			if (!isturf(A.loc) || !isturf(D.loc))
 				to_chat(A, "<span class='warning'>You can't slam [D] here!</span>")
@@ -255,7 +255,7 @@
 				A.pixel_y = 0
 				D.pixel_x = 0
 				D.pixel_y = 0
-				return 0
+				return
 		else
 			if (A)
 				A.pixel_x = 0
@@ -263,7 +263,7 @@
 			if (D)
 				D.pixel_x = 0
 				D.pixel_y = 0
-			return 0
+			return
 
 		sleep(1)
 
@@ -275,11 +275,11 @@
 
 		if (get_dist(A, D) > 1)
 			to_chat(A, "<span class='warning'>[D] is too far away!</span>")
-			return 0
+			return
 
 		if (!isturf(A.loc) || !isturf(D.loc))
 			to_chat(A, "<span class='warning'>You can't slam [D] here!</span>")
-			return 0
+			return
 
 		D.forceMove(A.loc)
 
@@ -318,7 +318,7 @@
 
 
 	log_combat(A, D, "body-slammed")
-	return 0
+	return
 
 /datum/martial_art/wrestling/proc/CheckStrikeTurf(mob/living/carbon/human/A, turf/T)
 	if (A && (T && isturf(T) && get_dist(A, T) <= 1))
@@ -401,12 +401,12 @@
 				A.adjustBruteLoss(rand(10,20))
 				A.Paralyze(60)
 			to_chat(A, "<span class='warning'>[D] is too far away!</span>")
-			return 0
+			return
 
 		if (!isturf(A.loc) || !isturf(D.loc))
 			A.pixel_y = 0
 			to_chat(A, "<span class='warning'>You can't drop onto [D] from here!</span>")
-			return 0
+			return
 
 		if(A)
 			animate(A, transform = matrix(90, MATRIX_ROTATE), time = 1, loop = 0)

code/datums/mind.dm

@@ -34,7 +34,7 @@
 	var/name				//replaces mob/var/original_name
 	var/ghostname			//replaces name for observers name if set
 	var/mob/living/current
-	var/active = 0
+	var/active = FALSE
 
 	var/memory
 
@@ -779,7 +779,7 @@
 
 /mob/proc/sync_mind()
 	mind_initialize()	//updates the mind (or creates and initializes one if one doesn't exist)
-	mind.active = 1		//indicates that the mind is currently synced with a client
+	mind.active = TRUE	//indicates that the mind is currently synced with a client
 
 /datum/mind/proc/has_martialart(string)
 	if(martial_art && martial_art.id == string)

code/game/area/areas.dm

@@ -451,9 +451,9 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 /area/proc/powered(chan)		// return true if the area has power to given channel
 
 	if(!requires_power)
-		return 1
+		return TRUE
 	if(always_unpowered)
-		return 0
+		return FALSE
 	switch(chan)
 		if(AREA_USAGE_EQUIP)
 			return power_equip
@@ -462,13 +462,13 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 		if(AREA_USAGE_ENVIRON)
 			return power_environ
 
-	return 0
+	return FALSE
 
 /**
-  * Space is not powered ever, so this returns 0
+  * Space is not powered ever, so this returns false
   */
 /area/space/powered(chan) //Nope.avi
-	return 0
+	return FALSE
 
 /**
   * Called when the area power status changes

code/game/area/areas/holodeck.dm

@@ -6,7 +6,7 @@
 	area_flags = VALID_TERRITORY | UNIQUE_AREA | NOTELEPORT | HIDDEN_AREA
 
 	var/obj/machinery/computer/holodeck/linked
-	var/restricted = 0 // if true, program goes on emag list
+	var/restricted = FALSE // if true, program goes on emag list
 
 /*
 	Power tracking: Use the holodeck computer's power grid
@@ -33,7 +33,7 @@
 
 /area/holodeck/use_power(amount, chan)
 	if(!linked)
-		return 0
+		return FALSE
 	var/area/A = get_area(linked)
 	ASSERT(!istype(A, /area/holodeck))
 	return ..()
@@ -102,28 +102,28 @@
 
 /area/holodeck/rec_center/medical
 	name = "Holodeck - Emergency Medical"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/thunderdome1218
 	name = "Holodeck - 1218 AD"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/burn
 	name = "Holodeck - Atmospheric Burn Test"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/wildlife
 	name = "Holodeck - Wildlife Simulation"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/bunker
 	name = "Holodeck - Holdout Bunker"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/anthophila
 	name = "Holodeck - Anthophila"
-	restricted = 1
+	restricted = TRUE
 
 /area/holodeck/rec_center/refuel
 	name = "Holodeck - Refueling Station"
-	restricted = 1
+	restricted = TRUE

code/game/atoms.dm

@@ -643,7 +643,7 @@
 
 /// Updates the overlays of the atom
 /atom/proc/update_overlays()
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	. = list()
 	SEND_SIGNAL(src, COMSIG_ATOM_UPDATE_OVERLAYS, .)
 
@@ -1482,10 +1482,10 @@
 		return max_grav
 
 	if(isspaceturf(T)) // Turf never has gravity
-		return FALSE
+		return 0
 	if(istype(T, /turf/open/transparent/openspace)) //openspace in a space area doesn't get gravity
 		if(istype(get_area(T), /area/space))
-			return FALSE
+			return 0
 
 	var/area/A = get_area(T)
 	if(A.has_gravity) // Areas which always has gravity

code/game/atoms_movable.dm

@@ -605,38 +605,38 @@
   */
 /atom/movable/proc/Process_Spacemove(movement_dir = 0)
 	if(has_gravity(src))
-		return 1
+		return TRUE
 
 	if(pulledby)
-		return 1
+		return TRUE
 
 	if(throwing)
-		return 1
+		return TRUE
 
 	if(!isturf(loc))
-		return 1
+		return TRUE
 
 	if(locate(/obj/structure/lattice) in range(1, get_turf(src))) //Not realistic but makes pushing things in space easier
-		return 1
+		return TRUE
 
-	return 0
+	return FALSE
 
 
 /// Only moves the object if it's under no gravity
 /atom/movable/proc/newtonian_move(direction)
 	if(!loc || Process_Spacemove(0))
 		inertia_dir = 0
-		return 0
+		return FALSE
 
 	inertia_dir = direction
 	if(!direction)
-		return 1
+		return TRUE
 	inertia_last_loc = loc
 	SSspacedrift.processing[src] = src
-	return 1
+	return TRUE
 
 /atom/movable/proc/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
-	set waitfor = 0
+	set waitfor = FALSE
 	var/hitpush = TRUE
 	var/impact_signal = SEND_SIGNAL(src, COMSIG_MOVABLE_IMPACT, hit_atom, throwingdatum)
 	if(impact_signal & COMPONENT_MOVABLE_IMPACT_FLIP_HITPUSH)

code/game/communications.dm

@@ -150,7 +150,7 @@ GLOBAL_LIST_INIT(reverseradiochannels, list(
 	if(range)
 		start_point = get_turf(source)
 		if(!start_point)
-			return 0
+			return
 
 	//Send the data
 	for(var/current_filter in filter_list)

code/game/data_huds.dm

@@ -24,13 +24,13 @@
 
 /datum/atom_hud/data/human/medical/basic/proc/check_sensors(mob/living/carbon/human/H)
 	if(!istype(H))
-		return 0
+		return FALSE
 	var/obj/item/clothing/under/U = H.w_uniform
 	if(!istype(U))
-		return 0
+		return FALSE
 	if(U.sensor_mode <= SENSOR_VITALS)
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /datum/atom_hud/data/human/medical/basic/add_to_single_hud(mob/M, mob/living/carbon/H)
 	if(check_sensors(H))

code/game/gamemodes/changeling/traitor_chan.dm

@@ -17,12 +17,13 @@
 	var/const/changeling_amount = 1 //hard limit on changelings if scaling is turned off
 
 /datum/game_mode/traitor/changeling/can_start()
-	if(!..())
-		return 0
+	. = ..()
+	if(!.)
+		return
 	possible_changelings = get_players_for_role(ROLE_CHANGELING)
 	if(possible_changelings.len < required_enemies)
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /datum/game_mode/traitor/changeling/pre_setup()
 	if(CONFIG_GET(flag/protect_roles_from_antagonist))

code/game/gamemodes/cult/cult.dm

@@ -48,8 +48,6 @@
 	<span class='cult'>Cultists</span>: Carry out Nar'Sie's will.\n\
 	<span class='notice'>Crew</span>: Prevent the cult from expanding and drive it out."
 
-	var/finished = 0
-
 	var/acolytes_needed = 10 //for the survive objective
 	var/acolytes_survived = 0
 
@@ -145,9 +143,9 @@
 			if(cult_mind.current.onCentCom() || cult_mind.current.onSyndieBase())
 				acolytes_survived++
 	if(acolytes_survived>=acolytes_needed)
-		return 0
+		return FALSE
 	else
-		return 1
+		return TRUE
 
 
 /datum/game_mode/cult/generate_report()

code/game/gamemodes/devil/devil_agent/devil_agent.dm

@@ -40,5 +40,5 @@
 		outsellobjective.target = target_mind
 		outsellobjective.update_explanation_text()
 		D.objectives += outsellobjective
-		return 1
-	return 0
+		return TRUE
+	return FALSE

code/game/gamemodes/dynamic/dynamic_rulesets.dm

@@ -50,7 +50,7 @@
 	/// A flag that determines how the ruleset is handled
 	/// HIGHLANDER_RULESET are rulesets can end the round.
 	/// TRAITOR_RULESET and MINOR_RULESET can't end the round and have no difference right now.
-	var/flags = 0
+	var/flags = NONE
 	/// Pop range per requirement. If zero defaults to mode's pop_per_requirement.
 	var/pop_per_requirement = 0
 	/// Requirements are the threat level requirements per pop range.

code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm

@@ -714,7 +714,7 @@
 	cost = 0
 	requirements = list(101,101,101,101,101,101,101,101,101,101)
 	var/meteordelay = 2000
-	var/nometeors = 0
+	var/nometeors = FALSE
 	var/rampupdelta = 5
 
 /datum/dynamic_ruleset/roundstart/meteor/rule_process()

code/game/gamemodes/game_mode.dm

@@ -69,20 +69,20 @@
 			playerC++
 	if(!GLOB.Debug2)
 		if(playerC < required_players || (maximum_players >= 0 && playerC > maximum_players))
-			return 0
+			return FALSE
 	antag_candidates = get_players_for_role(antag_flag)
 	if(!GLOB.Debug2)
 		if(antag_candidates.len < required_enemies)
-			return 0
-		return 1
+			return FALSE
+		return TRUE
 	else
 		message_admins("<span class='notice'>DEBUG: GAME STARTING WITHOUT PLAYER NUMBER CHECKS, THIS WILL PROBABLY BREAK SHIT.</span>")
-		return 1
+		return TRUE
 
 
 ///Attempts to select players for special roles the mode might have.
 /datum/game_mode/proc/pre_setup()
-	return 1
+	return TRUE
 
 ///Everyone should now be on the station and have their normal gear.  This is the place to give the special roles extra things
 /datum/game_mode/proc/post_setup(report) //Gamemodes can override the intercept report. Passing TRUE as the argument will force a report.
@@ -119,7 +119,7 @@
 		addtimer(CALLBACK(src, .proc/send_intercept, 0), rand(waittime_l, waittime_h))
 	generate_station_goals()
 	gamemode_ready = TRUE
-	return 1
+	return TRUE
 
 
 ///Handles late-join antag assignments
@@ -159,10 +159,10 @@
 
 	switch(SSshuttle.emergency.mode) //Rounds on the verge of ending don't get new antags, they just run out
 		if(SHUTTLE_STRANDED, SHUTTLE_ESCAPE)
-			return 1
+			return TRUE
 		if(SHUTTLE_CALL)
 			if(SSshuttle.emergency.timeLeft(1) < initial(SSshuttle.emergencyCallTime)*0.5)
-				return 1
+				return TRUE
 
 	var/matc = CONFIG_GET(number/midround_antag_time_check)
 	if(world.time >= (matc * 600))
@@ -199,7 +199,7 @@
 	 //somewhere between 1 and 3 minutes from now
 	if(!CONFIG_GET(keyed_list/midround_antag)[SSticker.mode.config_tag])
 		round_converted = 0
-		return 1
+		return TRUE
 	for(var/mob/living/carbon/human/H in antag_candidates)
 		if(H.client)
 			replacementmode.make_antag_chance(H)
@@ -210,7 +210,7 @@
 
 ///Called by the gameSSticker
 /datum/game_mode/process()
-	return 0
+	return
 
 //For things that do not die easily
 /datum/game_mode/proc/are_special_antags_dead()
@@ -234,41 +234,41 @@
 				if(Player.mind)
 					if(Player.mind.special_role || LAZYLEN(Player.mind.antag_datums))
 						continuous_sanity_checked = 1
-						return 0
+						return FALSE
 			if(!continuous_sanity_checked)
 				message_admins("The roundtype ([config_tag]) has no antagonists, continuous round has been defaulted to on and midround_antag has been defaulted to off.")
 				continuous[config_tag] = TRUE
 				midround_antag[config_tag] = FALSE
 				SSshuttle.clearHostileEnvironment(src)
-				return 0
+				return FALSE
 
 
 		if(living_antag_player && living_antag_player.mind && isliving(living_antag_player) && living_antag_player.stat != DEAD && !isnewplayer(living_antag_player) &&!isbrain(living_antag_player) && (living_antag_player.mind.special_role || LAZYLEN(living_antag_player.mind.antag_datums)))
-			return 0 //A resource saver: once we find someone who has to die for all antags to be dead, we can just keep checking them, cycling over everyone only when we lose our mark.
+			return FALSE //A resource saver: once we find someone who has to die for all antags to be dead, we can just keep checking them, cycling over everyone only when we lose our mark.
 
 		for(var/mob/Player in GLOB.alive_mob_list)
 			if(Player.mind && Player.stat != DEAD && !isnewplayer(Player) &&!isbrain(Player) && Player.client && (Player.mind.special_role || LAZYLEN(Player.mind.antag_datums))) //Someone's still antagging but is their antagonist datum important enough to skip mulligan?
 				for(var/datum/antagonist/antag_types in Player.mind.antag_datums)
 					if(antag_types.prevent_roundtype_conversion)
 						living_antag_player = Player //they were an important antag, they're our new mark
-						return 0
+						return FALSE
 
 		if(!are_special_antags_dead())
 			return FALSE
 
 		if(!continuous[config_tag] || force_ending)
-			return 1
+			return TRUE
 
 		else
 			round_converted = convert_roundtype()
 			if(!round_converted)
 				if(round_ends_with_antag_death)
-					return 1
+					return TRUE
 				else
 					midround_antag[config_tag] = 0
-					return 0
+					return FALSE
 
-	return 0
+	return FALSE
 
 
 /datum/game_mode/proc/send_intercept()

code/game/gamemodes/meteor/meteors.dm

@@ -92,7 +92,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 	var/hitpwr = 2 //Level of ex_act to be called on hit.
 	var/dest
 	pass_flags = PASSTABLE
-	var/heavy = 0
+	var/heavy = FALSE
 	var/meteorsound = 'sound/effects/meteorimpact.ogg'
 	var/z_original
 	var/threat = 0 // used for determining which meteors are most interesting
@@ -245,7 +245,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 	name = "big meteor"
 	icon_state = "large"
 	hits = 6
-	heavy = 1
+	heavy = TRUE
 	dropamt = 4
 	threat = 10
 
@@ -258,7 +258,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 	name = "flaming meteor"
 	icon_state = "flaming"
 	hits = 5
-	heavy = 1
+	heavy = TRUE
 	meteorsound = 'sound/effects/bamf.ogg'
 	meteordrop = list(/obj/item/stack/ore/plasma)
 	threat = 20
@@ -271,7 +271,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 /obj/effect/meteor/irradiated
 	name = "glowing meteor"
 	icon_state = "glowing"
-	heavy = 1
+	heavy = TRUE
 	meteordrop = list(/obj/item/stack/ore/uranium)
 	threat = 15
 
@@ -288,7 +288,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 	icon_state = "meateor"
 	desc = "Just... don't think too hard about where this thing came from."
 	hits = 2
-	heavy = 1
+	heavy = TRUE
 	meteorsound = 'sound/effects/blobattack.ogg'
 	meteordrop = list(/obj/item/reagent_containers/food/snacks/meat/slab/human, /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant, /obj/item/organ/heart, /obj/item/organ/lungs, /obj/item/organ/tongue, /obj/item/organ/appendix/)
 	var/meteorgibs = /obj/effect/gibspawner/generic
@@ -340,7 +340,7 @@ GLOBAL_LIST_INIT(meteorsC, list(/obj/effect/meteor/dust)) //for space dust event
 	desc = "Your life briefly passes before your eyes the moment you lay them on this monstrosity."
 	hits = 30
 	hitpwr = 1
-	heavy = 1
+	heavy = TRUE
 	meteorsound = 'sound/effects/bamf.ogg'
 	meteordrop = list(/obj/item/stack/ore/plasma)
 	threat = 50
@@ -371,7 +371,7 @@ GLOBAL_LIST_INIT(meteorsSPOOKY, list(/obj/effect/meteor/pumpkin))
 	icon = 'icons/obj/meteor_spooky.dmi'
 	icon_state = "pumpkin"
 	hits = 10
-	heavy = 1
+	heavy = TRUE
 	dropamt = 1
 	meteordrop = list(/obj/item/clothing/head/hardhat/pumpkinhead, /obj/item/reagent_containers/food/snacks/grown/pumpkin)
 	threat = 100

code/game/gamemodes/objective.dm

@@ -8,8 +8,8 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 	var/team_explanation_text			//For when there are multiple owners.
 	var/datum/mind/target = null		//If they are focused on a particular person.
 	var/target_amount = 0				//If they are focused on a particular number. Steal objectives have their own counter.
-	var/completed = 0					//currently only used for custom objectives.
-	var/martyr_compatible = 0			//If the objective is compatible with martyr objective, i.e. if you can still do it while dead.
+	var/completed = FALSE				//currently only used for custom objectives.
+	var/martyr_compatible = FALSE		//If the objective is compatible with martyr objective, i.e. if you can still do it while dead.
 
 /datum/objective/New(text)
 	if(text)
@@ -170,7 +170,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 /datum/objective/assassinate
 	name = "assasinate"
 	var/target_role_type=FALSE
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 
 /datum/objective/assassinate/find_target_by_role(role, role_type=FALSE,invert=FALSE)
 	if(!invert)
@@ -191,7 +191,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 	admin_simple_target_pick(admin)
 
 /datum/objective/assassinate/internal
-	var/stolen = 0 		//Have we already eliminated this target?
+	var/stolen = FALSE 		//Have we already eliminated this target?
 
 /datum/objective/assassinate/internal/update_explanation_text()
 	..()
@@ -224,7 +224,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 /datum/objective/maroon
 	name = "maroon"
 	var/target_role_type=FALSE
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 
 /datum/objective/maroon/find_target_by_role(role, role_type=FALSE,invert=FALSE)
 	if(!invert)
@@ -279,7 +279,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 
 /datum/objective/protect//The opposite of killing a dude.
 	name = "protect"
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 	var/target_role_type = FALSE
 	var/human_check = TRUE
 
@@ -350,7 +350,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 	name = "hijack"
 	explanation_text = "Hijack the shuttle to ensure no loyalist Nanotrasen crew escape alive and out of custody."
 	team_explanation_text = "Hijack the shuttle to ensure no loyalist Nanotrasen crew escape alive and out of custody. Leave no team member behind."
-	martyr_compatible = 0 //Technically you won't get both anyway.
+	martyr_compatible = FALSE //Technically you won't get both anyway.
 
 /datum/objective/hijack/check_completion() // Requires all owners to escape.
 	if(SSshuttle.emergency.mode != SHUTTLE_ENDGAME)
@@ -378,7 +378,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 /datum/objective/purge
 	name = "no mutants on shuttle"
 	explanation_text = "Ensure no mutant humanoid species are present aboard the escape shuttle."
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 
 /datum/objective/purge/check_completion()
 	if(SSshuttle.emergency.mode != SHUTTLE_ENDGAME)
@@ -393,7 +393,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 /datum/objective/robot_army
 	name = "robot army"
 	explanation_text = "Have at least eight active cyborgs synced to you."
-	martyr_compatible = 0
+	martyr_compatible = FALSE
 
 /datum/objective/robot_army/check_completion()
 	var/counter = 0
@@ -497,7 +497,7 @@ GLOBAL_LIST(admin_objective_list) //Prefilled admin assignable objective list
 /datum/objective/nuclear
 	name = "nuclear"
 	explanation_text = "Destroy the station with a nuclear device."
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 
 /datum/objective/nuclear/check_completion()
 	if(SSticker && SSticker.mode && SSticker.mode.station_was_nuked)
@@ -509,7 +509,7 @@ GLOBAL_LIST_EMPTY(possible_items)
 	name = "steal"
 	var/datum/objective_item/targetinfo = null //Save the chosen item datum so we can access it later.
 	var/obj/item/steal_target = null //Needed for custom objectives (they're just items, not datums).
-	martyr_compatible = 0
+	martyr_compatible = FALSE
 
 /datum/objective/steal/get_target()
 	return steal_target
@@ -793,7 +793,7 @@ GLOBAL_LIST_EMPTY(possible_items_special)
 
 /datum/objective/destroy
 	name = "destroy AI"
-	martyr_compatible = 1
+	martyr_compatible = TRUE
 
 /datum/objective/destroy/find_target(dupe_search_range)
 	var/list/possible_targets = active_ais(1)
@@ -891,7 +891,7 @@ GLOBAL_LIST_EMPTY(possible_items_special)
 ////////////////////////////////
 
 /datum/objective/changeling_team_objective //Abstract type
-	martyr_compatible = 0	//Suicide is not teamwork!
+	martyr_compatible = FALSE	//Suicide is not teamwork!
 	explanation_text = "Changeling Friendship!"
 	var/min_lings = 3 //Minimum amount of lings for this team objective to be possible
 	var/escape_objective_compatible = FALSE

code/game/gamemodes/objective_items.dm

@@ -136,8 +136,8 @@
 /datum/objective_item/steal/functionalai/check_special_completion(obj/item/aicard/C)
 	for(var/mob/living/silicon/ai/A in C)
 		if(isAI(A) && A.stat != DEAD) //See if any AI's are alive inside that card.
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 /datum/objective_item/steal/blueprints
 	name = "the station blueprints."

code/game/gamemodes/sandbox/airlock_maker.dm

@@ -21,7 +21,7 @@
 	var/require_all = 1
 
 	var/paintjob = "none"
-	var/glassdoor = 0
+	var/glassdoor = FALSE
 
 	var/doorname = "airlock"
 

code/game/gamemodes/sandbox/h_sandbox.dm

@@ -4,7 +4,7 @@ GLOBAL_VAR_INIT(hsboxspawn, TRUE)
 	sandbox = new/datum/h_sandbox
 	sandbox.owner = src.ckey
 	if(src.client.holder)
-		sandbox.admin = 1
+		sandbox.admin = TRUE
 	add_verb(src, /mob/proc/sandbox_panel)
 
 /mob/proc/sandbox_panel()
@@ -14,7 +14,7 @@ GLOBAL_VAR_INIT(hsboxspawn, TRUE)
 
 /datum/h_sandbox
 	var/owner = null
-	var/admin = 0
+	var/admin = FALSE
 
 	var/static/clothinfo = null
 	var/static/reaginfo = null

code/game/machinery/_machinery.dm

@@ -266,12 +266,12 @@ Class Procs:
 
 /obj/machinery/proc/auto_use_power()
 	if(!powered(power_channel))
-		return 0
+		return FALSE
 	if(use_power == 1)
 		use_power(idle_power_usage,power_channel)
 	else if(use_power >= 2)
 		use_power(active_power_usage,power_channel)
-	return 1
+	return TRUE
 
 
 ///Called when we want to change the value of the `is_operational` variable. Boolean.
@@ -370,11 +370,11 @@ Class Procs:
 /obj/machinery/Topic(href, href_list)
 	..()
 	if(!can_interact(usr))
-		return 1
+		return TRUE
 	if(!usr.canUseTopic(src))
-		return 1
+		return TRUE
 	add_fingerprint(usr)
-	return 0
+	return FALSE
 
 ////////////////////////////////////////////////////////////////////////////////////////////
 
@@ -467,7 +467,7 @@ Class Procs:
 	M.icon_state = "box_1"
 
 /obj/machinery/obj_break(damage_flag)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	. = ..()
 	if(!(machine_stat & BROKEN) && !(flags_1 & NODECONSTRUCT_1))
 		set_machine_stat(machine_stat | BROKEN)
@@ -513,8 +513,8 @@ Class Procs:
 		I.play_tool_sound(src, 50)
 		setDir(turn(dir,-90))
 		to_chat(user, "<span class='notice'>You rotate [src].</span>")
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 /obj/proc/can_be_unfasten_wrench(mob/user, silent) //if we can unwrench this object; returns SUCCESSFUL_UNFASTEN and FAILED_UNFASTEN, which are both TRUE, or CANT_UNFASTEN, which isn't.
 	if(!(isfloorturf(loc) || istype(loc, /turf/open/indestructible)) && !anchored)

code/game/machinery/autolathe.dm

@@ -17,7 +17,7 @@
 	var/list/L = list()
 	var/list/LL = list()
 	var/hacked = FALSE
-	var/disabled = 0
+	var/disabled = FALSE
 	var/shocked = FALSE
 	var/hack_wire
 	var/disable_wire

code/game/machinery/camera/tracking.dm

@@ -96,14 +96,14 @@
 			return
 
 		if(!target.can_track(usr))
-			U.tracking = 1
+			U.tracking = TRUE
 			if(!cameraticks)
 				to_chat(U, "<span class='warning'>Target is not near any active cameras. Attempting to reacquire...</span>")
 			cameraticks++
 			if(cameraticks > 9)
 				U.cameraFollow = null
 				to_chat(U, "<span class='warning'>Unable to reacquire, cancelling track...</span>")
-				tracking = 0
+				tracking = FALSE
 				return
 			else
 				sleep(10)
@@ -111,7 +111,7 @@
 
 		else
 			cameraticks = 0
-			U.tracking = 0
+			U.tracking = FALSE
 
 		if(U.eyeobj)
 			U.eyeobj.setLoc(get_turf(target))

code/game/machinery/computer/_computer.dm

@@ -25,8 +25,8 @@
 
 /obj/machinery/computer/process()
 	if(machine_stat & (NOPOWER|BROKEN))
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /obj/machinery/computer/update_overlays()
 	. = ..()

code/game/machinery/computer/card.dm

@@ -514,10 +514,10 @@ GLOBAL_VAR_INIT(time_last_changed_position, 0)
 				var/datum/job/j = SSjob.GetJob(edit_job_target)
 				if(!j)
 					updateUsrDialog()
-					return 0
+					return
 				if(can_open_job(j) != 1)
 					updateUsrDialog()
-					return 0
+					return
 				if(opened_positions[edit_job_target] >= 0)
 					GLOB.time_last_changed_position = world.time / 10
 				j.total_positions++
@@ -531,10 +531,10 @@ GLOBAL_VAR_INIT(time_last_changed_position, 0)
 				var/datum/job/j = SSjob.GetJob(edit_job_target)
 				if(!j)
 					updateUsrDialog()
-					return 0
+					return
 				if(can_close_job(j) != 1)
 					updateUsrDialog()
-					return 0
+					return
 				//Allow instant closing without cooldown if a position has been opened before
 				if(opened_positions[edit_job_target] <= 0)
 					GLOB.time_last_changed_position = world.time / 10
@@ -549,7 +549,7 @@ GLOBAL_VAR_INIT(time_last_changed_position, 0)
 				var/datum/job/j = SSjob.GetJob(priority_target)
 				if(!j)
 					updateUsrDialog()
-					return 0
+					return
 				var/priority = TRUE
 				if(j in SSjob.prioritized_jobs)
 					SSjob.prioritized_jobs -= j

code/game/machinery/computer/medical.dm

@@ -559,14 +559,12 @@
 				continue
 
 /obj/machinery/computer/med_data/proc/canUseMedicalRecordsConsole(mob/user, message = 1, record1, record2)
-	if(user)
-		if(message)
-			if(authenticated)
-				if(user.canUseTopic(src, !issilicon(user)))
-					if(!record1 || record1 == active1)
-						if(!record2 || record2 == active2)
-							return 1
-	return 0
+	if(user && message && authenticated)
+		if(user.canUseTopic(src, !issilicon(user)))
+			if(!record1 || record1 == active1)
+				if(!record2 || record2 == active2)
+					return TRUE
+	return FALSE
 
 /obj/machinery/computer/med_data/laptop
 	name = "medical laptop"

code/game/machinery/computer/security.dm

@@ -855,12 +855,11 @@ What a mess.*/
 			continue
 
 /obj/machinery/computer/secure_data/proc/canUseSecurityRecordsConsole(mob/user, message1 = 0, record1, record2)
-	if(user)
-		if(authenticated)
-			if(user.canUseTopic(src, !issilicon(user)))
-				if(!trim(message1))
-					return 0
-				if(!record1 || record1 == active1)
-					if(!record2 || record2 == active2)
-						return 1
-	return 0
+	if(user && authenticated)
+		if(user.canUseTopic(src, !issilicon(user)))
+			if(!trim(message1))
+				return FALSE
+			if(!record1 || record1 == active1)
+				if(!record2 || record2 == active2)
+					return TRUE
+	return FALSE

code/game/machinery/constructable_frame.dm

@@ -31,7 +31,7 @@
 /obj/structure/frame/machine/examine(user)
 	. = ..()
 	if(state == 3 && req_components && req_component_names)
-		var/hasContent = 0
+		var/hasContent = FALSE
 		var/requires = "It requires"
 
 		for(var/i = 1 to req_components.len)
@@ -41,7 +41,7 @@
 				continue
 			var/use_and = i == req_components.len
 			requires += "[(hasContent ? (use_and ? ", and" : ",") : "")] [amt] [amt == 1 ? req_component_names[tname] : "[req_component_names[tname]]\s"]"
-			hasContent = 1
+			hasContent = TRUE
 
 		if(hasContent)
 			. +=  "[requires]."
@@ -267,9 +267,9 @@
 						to_chat(user, "<span class='notice'>You add [P] to [src].</span>")
 						components += P
 						req_components[I]--
-						return 1
+						return TRUE
 				to_chat(user, "<span class='warning'>You cannot add that to the machine!</span>")
-				return 0
+				return FALSE
 	if(user.a_intent == INTENT_HARM)
 		return ..()
 

code/game/machinery/doors/airlock_types.dm

@@ -472,11 +472,11 @@
 
 /obj/machinery/door/airlock/cult/allowed(mob/living/L)
 	if(!density)
-		return 1
+		return TRUE
 	if(friendly || iscultist(L) || istype(L, /mob/living/simple_animal/shade) || isconstruct(L))
 		if(!stealthy)
 			new openingoverlaytype(loc)
-		return 1
+		return TRUE
 	else
 		if(!stealthy)
 			new /obj/effect/temp_visual/cult/sac(loc)
@@ -486,7 +486,7 @@
 			flash_color(L, flash_color="#960000", flash_time=20)
 			L.Paralyze(40)
 			L.throw_at(throwtarget, 5, 1,src)
-		return 0
+		return FALSE
 
 /obj/machinery/door/airlock/cult/proc/conceal()
 	icon = 'icons/obj/doors/airlocks/station/maintenance.dmi'

code/game/machinery/embedded_controller/embedded_controller_base.dm

@@ -35,15 +35,16 @@
 /obj/machinery/embedded_controller/proc/return_text()
 
 /obj/machinery/embedded_controller/proc/post_signal(datum/signal/signal, comm_line)
-	return 0
+	return
 
 /obj/machinery/embedded_controller/receive_signal(datum/signal/signal)
 	if(istype(signal) && program)
 		program.receive_signal(signal)
 
 /obj/machinery/embedded_controller/Topic(href, href_list)
-	if(..())
-		return 0
+	. = ..()
+	if(.)
+		return
 
 	if(program)
 		program.receive_user_command(href_list["command"])

code/game/machinery/lightswitch.dm

@@ -52,7 +52,7 @@
 	area.power_change()
 
 /obj/machinery/light_switch/power_change()
-	SHOULD_CALL_PARENT(0)
+	SHOULD_CALL_PARENT(FALSE)
 	if(area == get_area(src))
 		return ..()
 

code/game/machinery/magnet.dm

@@ -201,8 +201,8 @@
 	var/speed = 1 // lowest = 1, highest = 10
 	var/list/rpath = list() // real path of the magnet, used in iterator
 
-	var/moving = 0 // 1 if scheduled to loop
-	var/looping = 0 // 1 if looping
+	var/moving = TRUE // true if scheduled to loop
+	var/looping = TRUE // true if looping
 
 	var/datum/radio_frequency/radio_connection
 
@@ -301,7 +301,7 @@
 			if("setpath")
 				var/newpath = stripped_input(usr, "Please define a new path!", "New Path", path, MAX_MESSAGE_LEN)
 				if(newpath && newpath != "")
-					moving = 0 // stop moving
+					moving = FALSE // stop moving
 					path = newpath
 					pathpos = 1 // reset position
 					filter_path() // renders rpath
@@ -323,7 +323,7 @@
 		if(machine_stat & (BROKEN|NOPOWER))
 			break
 
-		looping = 1
+		looping = TRUE
 
 		// Prepare the radio signal
 		var/datum/signal/signal = new(list("code" = code))
@@ -353,7 +353,7 @@
 		else
 			sleep(12-speed)
 
-	looping = 0
+	looping = FALSE
 
 
 /obj/machinery/magnetic_controller/proc/filter_path()

code/game/machinery/medical_kiosk.dm

@@ -234,7 +234,7 @@
 	if(altPatient.reagents.reagent_list.len)	//Chemical Analysis details.
 		for(var/datum/reagent/R in altPatient.reagents.reagent_list)
 			chemical_list += list(list("name" = R.name, "volume" = round(R.volume, 0.01)))
-			if(R.overdosed == 1)
+			if(R.overdosed)
 				overdose_list += list(list("name" = R.name))
 
 	if(altPatient.reagents.addiction_list.len)

code/game/machinery/newscaster.dm

@@ -13,7 +13,7 @@ GLOBAL_LIST_EMPTY(allCasters)
 	var/body =""
 	var/list/authorCensorTime = list()
 	var/list/bodyCensorTime = list()
-	var/is_admin_message = 0
+	var/is_admin_message = FALSE
 	var/icon/img = null
 	var/time_stamp = ""
 	var/list/datum/newscaster/feed_comment/comments = list()
@@ -61,11 +61,11 @@ GLOBAL_LIST_EMPTY(allCasters)
 	var/list/datum/newscaster/feed_message/messages = list()
 	var/locked = FALSE
 	var/author = ""
-	var/censored = 0
+	var/censored = FALSE
 	var/list/authorCensorTime = list()
 	var/list/DclassCensorTime = list()
 	var/authorCensor
-	var/is_admin_channel = 0
+	var/is_admin_channel = FALSE
 
 /datum/newscaster/feed_channel/proc/returnAuthor(censor)
 	if(censor == -1)
@@ -110,7 +110,7 @@ GLOBAL_LIST_EMPTY(allCasters)
 	CreateFeedChannel("Station Announcements", "SS13", 1)
 	wanted_issue = new /datum/newscaster/wanted_message
 
-/datum/newscaster/feed_network/proc/CreateFeedChannel(channel_name, author, locked, adminChannel = 0)
+/datum/newscaster/feed_network/proc/CreateFeedChannel(channel_name, author, locked, adminChannel = FALSE)
 	var/datum/newscaster/feed_channel/newChannel = new /datum/newscaster/feed_channel
 	newChannel.channel_name = channel_name
 	newChannel.author = author
@@ -118,7 +118,7 @@ GLOBAL_LIST_EMPTY(allCasters)
 	newChannel.is_admin_channel = adminChannel
 	network_channels += newChannel
 
-/datum/newscaster/feed_network/proc/SubmitArticle(msg, author, channel_name, datum/picture/picture, adminMessage = 0, allow_comments = 1, update_alert = TRUE)
+/datum/newscaster/feed_network/proc/SubmitArticle(msg, author, channel_name, datum/picture/picture, adminMessage = FALSE, allow_comments = TRUE, update_alert = TRUE)
 	var/datum/newscaster/feed_message/newMsg = new /datum/newscaster/feed_message
 	newMsg.author = author
 	newMsg.body = msg
@@ -138,8 +138,8 @@ GLOBAL_LIST_EMPTY(allCasters)
 	lastAction ++
 	newMsg.creationTime = lastAction
 
-/datum/newscaster/feed_network/proc/submitWanted(criminal, body, scanned_user, datum/picture/picture, adminMsg = 0, newMessage = 0)
-	wanted_issue.active = 1
+/datum/newscaster/feed_network/proc/submitWanted(criminal, body, scanned_user, datum/picture/picture, adminMsg = FALSE, newMessage = FALSE)
+	wanted_issue.active = TRUE
 	wanted_issue.criminal = criminal
 	wanted_issue.body = body
 	wanted_issue.scannedUser = scanned_user
@@ -153,7 +153,7 @@ GLOBAL_LIST_EMPTY(allCasters)
 			N.update_icon()
 
 /datum/newscaster/feed_network/proc/deleteWanted()
-	wanted_issue.active = 0
+	wanted_issue.active = FALSE
 	wanted_issue.criminal = null
 	wanted_issue.body = null
 	wanted_issue.scannedUser = null
@@ -273,9 +273,9 @@ GLOBAL_LIST_EMPTY(allCasters)
 				dat+= "<BR><A href='?src=[REF(src)];refresh=1'>Re-scan User</A>"
 				dat+= "<BR><BR><A href='?src=[REF(human_or_robot_user)];mach_close=newscaster_main'>Exit</A>"
 				if(securityCaster)
-					var/wanted_already = 0
+					var/wanted_already = FALSE
 					if(GLOB.news_network.wanted_issue.active)
-						wanted_already = 1
+						wanted_already = TRUE
 					dat+="<HR><B>Feed Security functions:</B><BR>"
 					dat+="<BR><A href='?src=[REF(src)];menu_wanted=1'>[(wanted_already) ? ("Manage") : ("Publish")] \"Wanted\" Issue</A>"
 					dat+="<BR><A href='?src=[REF(src)];menu_censor_story=1'>Censor Feed Stories</A>"
@@ -334,10 +334,10 @@ GLOBAL_LIST_EMPTY(allCasters)
 					dat+="<FONT COLOR='maroon'>There is already a Feed channel under your name.</FONT><BR>"
 				if(channel_name=="" || channel_name == "\[REDACTED\]")
 					dat+="<FONT COLOR='maroon'>Invalid channel name.</FONT><BR>"
-				var/check = 0
+				var/check = FALSE
 				for(var/datum/newscaster/feed_channel/FC in GLOB.news_network.network_channels)
 					if(FC.channel_name == channel_name)
-						check = 1
+						check = TRUE
 						break
 				if(check)
 					dat+="<FONT COLOR='maroon'>Channel name already in use.</FONT><BR>"
@@ -436,10 +436,10 @@ GLOBAL_LIST_EMPTY(allCasters)
 				dat+="<BR><A href='?src=[REF(src)];setScreen=[11]'>Back</A>"
 			if(14)
 				dat+="<B>Wanted Issue Handler:</B>"
-				var/wanted_already = 0
+				var/wanted_already = FALSE
 				var/end_param = 1
 				if(GLOB.news_network.wanted_issue.active)
-					wanted_already = 1
+					wanted_already = TRUE
 					end_param = 2
 				if(wanted_already)
 					dat+="<FONT SIZE=2><BR><I>A wanted issue is already in Feed Circulation. You can edit or cancel it below.</FONT></I>"
@@ -516,10 +516,10 @@ GLOBAL_LIST_EMPTY(allCasters)
 					existing_authors += GLOB.news_network.redactedText
 				else
 					existing_authors += FC.author
-			var/check = 0
+			var/check = FALSE
 			for(var/datum/newscaster/feed_channel/FC in GLOB.news_network.network_channels)
 				if(FC.channel_name == channel_name)
-					check = 1
+					check = TRUE
 					break
 			if(channel_name == "" || channel_name == "\[REDACTED\]" || scanned_user == "Unknown" || check || (scanned_user in existing_authors) )
 				screen=7
@@ -578,10 +578,7 @@ GLOBAL_LIST_EMPTY(allCasters)
 			screen=11
 			updateUsrDialog()
 		else if(href_list["menu_wanted"])
-			var/already_wanted = 0
 			if(GLOB.news_network.wanted_issue.active)
-				already_wanted = 1
-			if(already_wanted)
 				channel_name = GLOB.news_network.wanted_issue.criminal
 				msg = GLOB.news_network.wanted_issue.body
 			screen = 14
@@ -971,17 +968,17 @@ GLOBAL_LIST_EMPTY(allCasters)
 
 /obj/item/newspaper/proc/notContent(list/L)
 	if(!L.len)
-		return 0
+		return FALSE
 	for(var/i=L.len;i>0;i--)
 		var/num = abs(L[i])
 		if(creationTime <= num)
 			continue
 		else
 			if(L[i] > 0)
-				return 1
+				return TRUE
 			else
-				return 0
-	return 0
+				return FALSE
+	return FALSE
 
 /obj/item/newspaper/Topic(href, href_list)
 	var/mob/living/U = usr

code/game/machinery/recycler.dm

@@ -10,7 +10,7 @@
 	circuit = /obj/item/circuitboard/machine/recycler
 	var/safety_mode = FALSE // Temporarily stops machine if it detects a mob
 	var/icon_name = "grinder-o"
-	var/blood = 0
+	var/bloody = FALSE
 	var/eat_dir = WEST
 	var/amount_produced = 50
 	var/crush_damage = 1000
@@ -76,7 +76,7 @@
 	var/is_powered = !(machine_stat & (BROKEN|NOPOWER))
 	if(safety_mode)
 		is_powered = FALSE
-	icon_state = icon_name + "[is_powered]" + "[(blood ? "bld" : "")]" // add the blood tag at the end
+	icon_state = icon_name + "[is_powered]" + "[(bloody ? "bld" : "")]" // add the blood tag at the end
 
 /obj/machinery/recycler/CanAllowThrough(atom/movable/AM)
 	. = ..()
@@ -181,8 +181,8 @@
 			L.say("ARRRRRRRRRRRGH!!!", forced="recycler grinding")
 		add_mob_blood(L)
 
-	if(!blood && !issilicon(L))
-		blood = TRUE
+	if(!bloody && !issilicon(L))
+		bloody = TRUE
 		update_icon()
 
 	// Instantly lie down, also go unconscious from the pain, before you die.

code/game/machinery/slotmachine.dm

@@ -26,7 +26,7 @@
 	light_color = LIGHT_COLOR_BROWN
 	var/money = 3000 //How much money it has CONSUMED
 	var/plays = 0
-	var/working = 0
+	var/working = FALSE
 	var/balance = 0 //How much money is in the machine, ready to be CONSUMED.
 	var/jackpots = 0
 	var/paymode = HOLOCHIP //toggles between HOLOCHIP/COIN, defined above
@@ -229,15 +229,17 @@
 /obj/machinery/computer/slot_machine/proc/can_spin(mob/user)
 	if(machine_stat & NOPOWER)
 		to_chat(user, "<span class='warning'>The slot machine has no power!</span>")
+		return FALSE
 	if(machine_stat & BROKEN)
 		to_chat(user, "<span class='warning'>The slot machine is broken!</span>")
+		return FALSE
 	if(working)
 		to_chat(user, "<span class='warning'>You need to wait until the machine stops spinning before you can play again!</span>")
-		return 0
+		return FALSE
 	if(balance < SPIN_PRICE)
 		to_chat(user, "<span class='warning'>Insufficient money to play!</span>")
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /obj/machinery/computer/slot_machine/proc/toggle_reel_spin(value, delay = 0) //value is 1 or 0 aka on or off
 	for(var/list/reel in reels)

code/game/machinery/suit_storage_unit.dm

@@ -360,7 +360,7 @@
 		dump_contents()
 
 /obj/machinery/suit_storage_unit/proc/resist_open(mob/user)
-	if(!state_open && occupant && (user in src) && user.stat == 0) // Check they're still here.
+	if(!state_open && occupant && (user in src) && user.stat == CONSCIOUS) // Check they're still here.
 		visible_message("<span class='notice'>You see [user] burst out of [src]!</span>", \
 			"<span class='notice'>You escape the cramped confines of [src]!</span>")
 		open_machine()

code/game/machinery/syndicatebeacon.dm

@@ -13,7 +13,7 @@
 	verb_say = "states"
 	var/cooldown = 0
 
-	var/active = 0
+	var/active = FALSE
 	var/icontype = "beacon"
 
 
@@ -26,7 +26,7 @@
 		if(singulo.z == z)
 			singulo.target = src
 	icon_state = "[icontype]1"
-	active = 1
+	active = TRUE
 	if(user)
 		to_chat(user, "<span class='notice'>You activate the beacon.</span>")
 
@@ -36,7 +36,7 @@
 		if(singulo.target == src)
 			singulo.target = null
 	icon_state = "[icontype]0"
-	active = 0
+	active = FALSE
 	if(user)
 		to_chat(user, "<span class='notice'>You deactivate the beacon.</span>")
 

code/game/machinery/teleporter.dm

@@ -13,7 +13,7 @@
 	circuit = /obj/item/circuitboard/machine/teleporter_hub
 	var/accuracy = 0
 	var/obj/machinery/teleport/station/power_station
-	var/calibrated //Calibration prevents mutation
+	var/calibrated = FALSE//Calibration prevents mutation
 
 /obj/machinery/teleport/hub/Initialize()
 	. = ..()
@@ -83,7 +83,7 @@
 							log_game("[human] ([key_name(human)]) was turned into a fly person")
 
 					human.apply_effect((rand(120 - accuracy * 40, 180 - accuracy * 60)), EFFECT_IRRADIATE, 0)
-			calibrated = 0
+			calibrated = FALSE
 	return
 
 /obj/machinery/teleport/hub/update_icon_state()

code/game/machinery/washing_machine.dm

@@ -139,7 +139,7 @@ GLOBAL_LIST_INIT(dye_registry, list(
 	density = TRUE
 	state_open = TRUE
 	var/busy = FALSE
-	var/bloody_mess = 0
+	var/bloody_mess = FALSE
 	var/obj/item/color_source
 	var/max_wash_capacity = 5
 
@@ -264,7 +264,7 @@ GLOBAL_LIST_INIT(dye_registry, list(
 
 /obj/item/clothing/shoes/sneakers/machine_wash(obj/machinery/washing_machine/WM)
 	if(chained)
-		chained = 0
+		chained = FALSE
 		slowdown = SHOES_SLOWDOWN
 		new /obj/item/restraints/handcuffs(loc)
 	..()

code/game/mecha/equipment/tools/other_tools.dm

@@ -45,10 +45,10 @@
 	var/turf/pos = get_turf(src)
 	for(var/turf/T in get_area_turfs(thearea.type))
 		if(!T.density && pos.z == T.z)
-			var/clear = 1
+			var/clear = TRUE
 			for(var/obj/O in T)
 				if(O.density)
-					clear = 0
+					clear = FALSE
 					break
 			if(clear)
 				L+=T

code/game/objects/buckling.dm

@@ -1,7 +1,7 @@
 /atom/movable
-	var/can_buckle = 0
+	var/can_buckle = FALSE
 	var/buckle_lying = -1 //bed-like behaviour, forces mob.lying = buckle_lying if != -1
-	var/buckle_requires_restraints = 0 //require people to be handcuffed before being able to buckle. eg: pipes
+	var/buckle_requires_restraints = FALSE //require people to be handcuffed before being able to buckle. eg: pipes
 	var/list/mob/living/buckled_mobs = null //list()
 	var/max_buckled_mobs = 1
 	var/buckle_prevents_pull = FALSE
@@ -15,10 +15,10 @@
 		if(buckled_mobs.len > 1)
 			var/unbuckled = input(user, "Who do you wish to unbuckle?","Unbuckle Who?") as null|mob in sortNames(buckled_mobs)
 			if(user_unbuckle_mob(unbuckled,user))
-				return 1
+				return TRUE
 		else
 			if(user_unbuckle_mob(buckled_mobs[1],user))
-				return 1
+				return TRUE
 
 /atom/movable/attackby(obj/item/W, mob/user, params)
 	if(!can_buckle || !istype(W, /obj/item/riding_offhand) || !user.Adjacent(src))

code/game/objects/effects/alien_acid.dm

@@ -32,10 +32,9 @@
 	return ..()
 
 /obj/effect/acid/process()
-	. = 1
 	if(!target)
 		qdel(src)
-		return 0
+		return FALSE
 
 	if(prob(5))
 		playsound(loc, 'sound/items/welder.ogg', 100, TRUE)
@@ -50,7 +49,8 @@
 	acid_level = max(acid_level - (5 + 2*round(sqrt(acid_level))), 0)
 	if(acid_level <= 0)
 		qdel(src)
-		return 0
+		return FALSE
+	return TRUE
 
 /obj/effect/acid/Crossed(AM as mob|obj)
 	. = ..()

code/game/objects/effects/decals/cleanable/aliens.dm

@@ -27,7 +27,7 @@
 	mergeable_decal = FALSE
 
 /obj/effect/decal/cleanable/xenoblood/xgibs/proc/streak(list/directions)
-	set waitfor = 0
+	set waitfor = FALSE
 	var/direction = pick(directions)
 	for(var/i = 0, i < pick(1, 200; 2, 150; 3, 50), i++)
 		sleep(2)

code/game/objects/effects/decals/cleanable/humans.dm

@@ -227,5 +227,5 @@
 
 /obj/effect/decal/cleanable/blood/footprints/can_bloodcrawl_in()
 	if((blood_state != BLOOD_STATE_OIL) && (blood_state != BLOOD_STATE_NOT_BLOODY))
-		return 1
-	return 0
+		return TRUE
+	return FALSE

code/game/objects/effects/decals/cleanable/robots.dm

@@ -13,7 +13,7 @@
 	beauty = -50
 
 /obj/effect/decal/cleanable/robot_debris/proc/streak(list/directions)
-	set waitfor = 0
+	set waitfor = FALSE
 	var/direction = pick(directions)
 	for (var/i = 0, i < pick(1, 200; 2, 150; 3, 50), i++)
 		sleep(2)

code/game/objects/effects/effect_system/effects_foam.dm

@@ -162,14 +162,14 @@
 
 /obj/effect/particle_effect/foam/proc/foam_mob(mob/living/L)
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(!istype(L))
-		return 0
+		return FALSE
 	var/fraction = 1/initial(reagent_divisor)
 	if(lifetime % reagent_divisor)
 		reagents.expose(L, VAPOR, fraction)
 	lifetime--
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/foam/proc/spread_foam()
 	var/turf/t_loc = get_turf(src)

code/game/objects/effects/effect_system/effects_other.dm

@@ -85,11 +85,11 @@
 
 /datum/effect_system/reagents_explosion
 	var/amount 						// TNT equivalent
-	var/flashing = 0			// does explosion creates flash effect?
+	var/flashing = FALSE			// does explosion creates flash effect?
 	var/flashing_factor = 0		// factor of how powerful the flash effect relatively to the explosion
 	var/explosion_message = 1				//whether we show a message to mobs.
 
-/datum/effect_system/reagents_explosion/set_up(amt, loca, flash = 0, flash_fact = 0, message = 1)
+/datum/effect_system/reagents_explosion/set_up(amt, loca, flash = FALSE, flash_fact = 0, message = TRUE)
 	amount = amt
 	explosion_message = message
 	if(isturf(loca))

code/game/objects/effects/effect_system/effects_smoke.dm

@@ -12,7 +12,7 @@
 	layer = FLY_LAYER
 	anchored = TRUE
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
-	animate_movement = 0
+	animate_movement = FALSE
 	var/amount = 4
 	var/lifetime = 5
 	var/opaque = 1 //whether the smoke can block the view when in enough amount
@@ -49,23 +49,23 @@
 	lifetime--
 	if(lifetime < 1)
 		kill_smoke()
-		return 0
+		return FALSE
 	for(var/mob/living/L in range(0,src))
 		smoke_mob(L)
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/smoke/proc/smoke_mob(mob/living/carbon/C)
 	if(!istype(C))
-		return 0
+		return FALSE
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(C.internal != null || C.has_smoke_protection())
-		return 0
+		return FALSE
 	if(C.smoke_delay)
-		return 0
+		return FALSE
 	C.smoke_delay++
 	addtimer(CALLBACK(src, .proc/remove_smoke_delay, C), 10)
-	return 1
+	return TRUE
 
 /obj/effect/particle_effect/smoke/proc/remove_smoke_delay(mob/living/carbon/C)
 	if(C)
@@ -126,11 +126,12 @@
 	lifetime = 8
 
 /obj/effect/particle_effect/smoke/bad/smoke_mob(mob/living/carbon/M)
-	if(..())
+	. = ..()
+	if(.)
 		M.drop_all_held_items()
 		M.adjustOxyLoss(1)
 		M.emote("cough")
-		return 1
+		return TRUE
 
 /obj/effect/particle_effect/smoke/bad/Crossed(atom/movable/AM, oldloc)
 	. = ..()
@@ -148,7 +149,7 @@
 /obj/effect/particle_effect/smoke/freezing
 	name = "nanofrost smoke"
 	color = "#B2FFFF"
-	opaque = 0
+	opaque = FALSE
 
 /datum/effect_system/smoke_spread/freezing
 	effect_type = /obj/effect/particle_effect/smoke/freezing
@@ -226,7 +227,8 @@
 
 
 /obj/effect/particle_effect/smoke/chem/process()
-	if(..())
+	. = ..()
+	if(.)
 		var/turf/T = get_turf(src)
 		var/fraction = 1/initial(lifetime)
 		for(var/atom/movable/AM in T)
@@ -237,20 +239,20 @@
 			reagents.expose(AM, TOUCH, fraction)
 
 		reagents.expose(T, TOUCH, fraction)
-		return 1
+		return TRUE
 
 /obj/effect/particle_effect/smoke/chem/smoke_mob(mob/living/carbon/M)
 	if(lifetime<1)
-		return 0
+		return FALSE
 	if(!istype(M))
-		return 0
+		return FALSE
 	var/mob/living/carbon/C = M
 	if(C.internal != null || C.has_smoke_protection())
-		return 0
+		return FALSE
 	var/fraction = 1/initial(lifetime)
 	reagents.copy_to(C, fraction*reagents.total_volume)
 	reagents.expose(M, INGEST, fraction)
-	return 1
+	return TRUE
 
 
 

code/game/objects/effects/effect_system/effects_water.dm

@@ -14,10 +14,10 @@
 /obj/effect/particle_effect/water/Move(turf/newloc)
 	if (--src.life < 1)
 		qdel(src)
-		return 0
+		return FALSE
 	if(newloc.density)
-		return 0
-	.=..()
+		return FALSE
+	return ..()
 
 /obj/effect/particle_effect/water/Bump(atom/A)
 	if(reagents)

code/game/objects/effects/effects.dm

@@ -5,7 +5,7 @@
 	icon = 'icons/effects/effects.dmi'
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF | FREEZE_PROOF
 	move_resist = INFINITY
-	obj_flags = 0
+	obj_flags = NONE
 	vis_flags = VIS_INHERIT_PLANE
 
 /obj/effect/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = 1, attack_dir)
@@ -18,7 +18,7 @@
 	return
 
 /obj/effect/mech_melee_attack(obj/mecha/M)
-	return 0
+	return
 
 /obj/effect/blob_act(obj/structure/blob/B)
 	return
@@ -45,7 +45,6 @@
 
 /obj/effect/singularity_act()
 	qdel(src)
-	return 0
 
 /obj/effect/ConveyorMove()
 	return

code/game/objects/effects/overlays.dm

@@ -50,8 +50,10 @@
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	anchored = TRUE
 	vis_flags = NONE
-	var/unused = 0 //When detected to be unused it gets set to world.time, after a while it gets removed
-	var/cache_expiration = 2 MINUTES // overlays which go unused for 2 minutes get cleaned up
+	///When detected to be unused it gets set to world.time, after a while it gets removed
+	var/unused = 0
+	///overlays which go unused for this amount of time get cleaned up
+	var/cache_expiration = 2 MINUTES
 
 /obj/effect/overlay/atmos_excited
 	name = "excited group"

code/game/objects/effects/step_triggers.dm

@@ -56,7 +56,7 @@
 		return
 	var/atom/movable/AM = A
 	var/curtiles = 0
-	var/stopthrow = 0
+	var/stopthrow = FALSE
 	for(var/obj/effect/step_trigger/thrower/T in orange(2, src))
 		if(AM in T.affecting)
 			return
@@ -82,11 +82,11 @@
 		if(!nostop)
 			for(var/obj/effect/step_trigger/T in get_step(AM, direction))
 				if(T.stopper && T != src)
-					stopthrow = 1
+					stopthrow = TRUE
 		else
 			for(var/obj/effect/step_trigger/teleporter/T in get_step(AM, direction))
 				if(T.stopper)
-					stopthrow = 1
+					stopthrow = TRUE
 
 		if(AM)
 			var/predir = AM.dir

code/game/objects/effects/temporary_visuals/cult.dm

@@ -1,11 +1,11 @@
 //temporary visual effects(/obj/effect/temp_visual) used by cult stuff
 /obj/effect/temp_visual/cult
 	icon = 'icons/effects/cult_effects.dmi'
-	randomdir = 0
+	randomdir = FALSE
 	duration = 10
 
 /obj/effect/temp_visual/cult/sparks
-	randomdir = 1
+	randomdir = TRUE
 	name = "blood sparks"
 	icon_state = "bloodsparkles"
 

code/game/objects/items.dm

@@ -460,7 +460,7 @@ GLOBAL_VAR_INIT(embedpocalypse, FALSE) // if true, all items will be able to emb
 	return ITALICS | REDUCE_RANGE
 
 /obj/item/proc/dropped(mob/user, silent = FALSE)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	for(var/X in actions)
 		var/datum/action/A = X
 		A.Remove(user)
@@ -474,7 +474,7 @@ GLOBAL_VAR_INIT(embedpocalypse, FALSE) // if true, all items will be able to emb
 
 /// called just as an item is picked up (loc is not yet changed)
 /obj/item/proc/pickup(mob/user)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	SEND_SIGNAL(src, COMSIG_ITEM_PICKUP, user)
 	item_flags |= IN_INVENTORY
 
@@ -491,7 +491,7 @@ GLOBAL_VAR_INIT(embedpocalypse, FALSE) // if true, all items will be able to emb
   * * Initial is used to indicate whether or not this is the initial equipment (job datums etc) or just a player doing it
   */
 /obj/item/proc/equipped(mob/user, slot, initial = FALSE)
-	SHOULD_CALL_PARENT(1)
+	SHOULD_CALL_PARENT(TRUE)
 	SEND_SIGNAL(src, COMSIG_ITEM_EQUIPPED, user, slot)
 	for(var/X in actions)
 		var/datum/action/A = X

code/game/objects/items/RCD.dm

@@ -810,7 +810,7 @@ RLD
 					playsound(src.loc, 'sound/machines/click.ogg', 50, TRUE)
 					if(do_after(user, decondelay, target = A))
 						if(!useResource(deconcost, user))
-							return 0
+							return FALSE
 						activate()
 						qdel(A)
 						return TRUE
@@ -871,9 +871,9 @@ RLD
 					playsound(src.loc, 'sound/effects/light_flicker.ogg', 50, TRUE)
 					if(do_after(user, floordelay, target = A))
 						if(!istype(F))
-							return 0
+							return FALSE
 						if(!useResource(floorcost, user))
-							return 0
+							return FALSE
 						activate()
 						var/destination = get_turf(A)
 						var/obj/machinery/light/floor/FL = new /obj/machinery/light/floor(destination)

code/game/objects/items/airlock_painter.dm

@@ -44,9 +44,9 @@
 	if(can_use(user))
 		ink.charges--
 		playsound(src.loc, 'sound/effects/spray2.ogg', 50, TRUE)
-		return 1
+		return TRUE
 	else
-		return 0
+		return FALSE
 
 //This proc only checks if the painter can be used.
 //Call this if you don't want the painter to be used right after this check, for example
@@ -54,12 +54,12 @@
 /obj/item/airlock_painter/proc/can_use(mob/user)
 	if(!ink)
 		to_chat(user, "<span class='warning'>There is no toner cartridge installed in [src]!</span>")
-		return 0
+		return FALSE
 	else if(ink.charges < 1)
 		to_chat(user, "<span class='warning'>[src] is out of ink!</span>")
-		return 0
+		return FALSE
 	else
-		return 1
+		return TRUE
 
 /obj/item/airlock_painter/suicide_act(mob/user)
 	var/obj/item/organ/lungs/L = user.getorganslot(ORGAN_SLOT_LUNGS)

code/game/objects/items/body_egg.dm

@@ -14,14 +14,14 @@
 	if(iscarbon(loc))
 		Insert(loc)
 
-/obj/item/organ/body_egg/Insert(mob/living/carbon/M, special = 0)
+/obj/item/organ/body_egg/Insert(mob/living/carbon/M, special = FALSE)
 	..()
 	ADD_TRAIT(owner, TRAIT_XENO_HOST, TRAIT_GENERIC)
 	ADD_TRAIT(owner, TRAIT_XENO_IMMUNE, "xeno immune")
 	owner.med_hud_set_status()
 	INVOKE_ASYNC(src, .proc/AddInfectionImages, owner)
 
-/obj/item/organ/body_egg/Remove(mob/living/carbon/M, special = 0)
+/obj/item/organ/body_egg/Remove(mob/living/carbon/M, special = FALSE)
 	if(owner)
 		REMOVE_TRAIT(owner, TRAIT_XENO_HOST, TRAIT_GENERIC)
 		REMOVE_TRAIT(owner, TRAIT_XENO_IMMUNE, "xeno immune")

code/game/objects/items/chainsaw.dm

@@ -88,5 +88,5 @@
 	if(attack_type == PROJECTILE_ATTACK)
 		owner.visible_message("<span class='danger'>Ranged attacks just make [owner] angrier!</span>")
 		playsound(src, pick('sound/weapons/bulletflyby.ogg', 'sound/weapons/bulletflyby2.ogg', 'sound/weapons/bulletflyby3.ogg'), 75, TRUE)
-		return 1
-	return 0
+		return TRUE
+	return FALSE

code/game/objects/items/chrono_eraser.dm

@@ -112,9 +112,9 @@
 			var/turf/currentpos = get_turf(src)
 			var/mob/living/user = loc
 			if((currentpos == startpos) && (field in view(CHRONO_BEAM_RANGE, currentpos)) && (user.mobility_flags & MOBILITY_STAND) && (user.stat == CONSCIOUS))
-				return 1
+				return TRUE
 		field_disconnect(F)
-		return 0
+		return FALSE
 
 /obj/item/gun/energy/chrono_gun/proc/pass_mind(datum/mind/M)
 	if(TED)
@@ -170,7 +170,6 @@
 	var/obj/item/gun/energy/chrono_gun/gun = null
 	var/tickstokill = 15
 	var/mutable_appearance/mob_underlay
-	var/preloaded = 0
 	var/RPpos = null
 	var/attached = TRUE //if the gun arg isn't included initially, then the chronofield will work without one
 

code/game/objects/items/cigs_lighters.dm

@@ -519,7 +519,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	smoketime = 0
 	chem_volume = 100
 	list_reagents = null
-	var/packeditem = 0
+	var/packeditem = FALSE
 
 /obj/item/clothing/mask/cigarette/pipe/Initialize()
 	. = ..()
@@ -537,11 +537,11 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 		if(ismob(loc))
 			var/mob/living/M = loc
 			to_chat(M, "<span class='notice'>Your [name] goes out.</span>")
-			lit = 0
+			lit = FALSE
 			icon_state = icon_off
 			inhand_icon_state = icon_off
 			M.update_inv_wear_mask()
-			packeditem = 0
+			packeditem = FALSE
 			name = "empty [initial(name)]"
 		STOP_PROCESSING(SSobj, src)
 		return
@@ -557,7 +557,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 			if(G.dry == 1)
 				to_chat(user, "<span class='notice'>You stuff [O] into [src].</span>")
 				smoketime = 400
-				packeditem = 1
+				packeditem = TRUE
 				name = "[O.name]-packed [initial(name)]"
 				if(O.reagents)
 					O.reagents.trans_to(src, O.reagents.total_volume, transfered_by = user)
@@ -580,7 +580,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	var/turf/location = get_turf(user)
 	if(lit)
 		user.visible_message("<span class='notice'>[user] puts out [src].</span>", "<span class='notice'>You put out [src].</span>")
-		lit = 0
+		lit = FALSE
 		icon_state = icon_off
 		inhand_icon_state = icon_off
 		STOP_PROCESSING(SSobj, src)
@@ -588,7 +588,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	if(!lit && smoketime > 0)
 		to_chat(user, "<span class='notice'>You empty [src] onto [location].</span>")
 		new /obj/effect/decal/cleanable/ash(location)
-		packeditem = 0
+		packeditem = FALSE
 		smoketime = 0
 		reagents.clear_reagents()
 		name = "empty [initial(name)]"
@@ -626,7 +626,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	light_power = 0.6
 	light_color = LIGHT_COLOR_FIRE
 	light_on = FALSE
-	var/lit = 0
+	var/lit = FALSE
 	var/fancy = TRUE
 	var/overlay_state
 	var/overlay_list = list(
@@ -849,8 +849,8 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	w_class = WEIGHT_CLASS_TINY
 	var/chem_volume = 100
 	var/vapetime = 0 //this so it won't puff out clouds every tick
-	var/screw = 0 // kinky
-	var/super = 0 //for the fattest vapes dude.
+	var/screw = FALSE // kinky
+	var/super = FALSE //for the fattest vapes dude.
 
 /obj/item/clothing/mask/vape/suicide_act(mob/user)
 	user.visible_message("<span class='suicide'>[user] is puffin hard on dat vape, [user.p_they()] trying to join the vape life on a whole notha plane!</span>")//it doesn't give you cancer, it is cancer
@@ -888,12 +888,12 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 		if(screw && !(obj_flags & EMAGGED))//also kinky
 			if(!super)
 				cut_overlays()
-				super = 1
+				super = TRUE
 				to_chat(user, "<span class='notice'>You increase the voltage of [src].</span>")
 				add_overlay("vapeopen_med")
 			else
 				cut_overlays()
-				super = 0
+				super = FALSE
 				to_chat(user, "<span class='notice'>You decrease the voltage of [src].</span>")
 				add_overlay("vapeopen_low")
 
@@ -908,7 +908,7 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 		if(!(obj_flags & EMAGGED))
 			cut_overlays()
 			obj_flags |= EMAGGED
-			super = 0
+			super = FALSE
 			to_chat(user, "<span class='warning'>You maximize the voltage of [src].</span>")
 			add_overlay("vapeopen_high")
 			var/datum/effect_system/spark_spread/sp = new /datum/effect_system/spark_spread //for effect