Lint with OpenDream (#81892)

## About The Pull Request

Courtesy of https://github.com/ParadiseSS13/Paradise/pull/21099 and
https://github.com/goonstation/goonstation/pull/18127

.github/workflows/ci_suite.yml

@@ -115,6 +115,25 @@ jobs:
         if: steps.linter-setup.conclusion == 'success' && !cancelled()
         run: tools/build/build --ci lint tgui-test
 
+  odlint:
+    if: ( !contains(github.event.head_commit.message, '[ci skip]') )
+    name: "Lint with OpenDream"
+    runs-on: ubuntu-22.04
+    concurrency:
+      group: odlint-${{ github.head_ref || github.run_id }}
+      cancel-in-progress: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: robinraju/release-downloader@v1.9
+        with:
+          repository: "OpenDreamProject/OpenDream"
+          tag: "latest"
+          fileName: "DMCompiler_linux-x64.tar.gz"
+          extract: true
+      - name: Run OpenDream
+        run: |
+          ./DMCompiler_linux-x64/DMCompiler tgstation.dme --suppress-unimplemented --define=CIBUILDING
+
   compile_all_maps:
     if: ( !contains(github.event.head_commit.message, '[ci skip]') )
     name: Compile Maps

.gitignore

@@ -241,3 +241,6 @@ define_sanity_output.txt
 # ezdb
 /db/
 /config/ezdb.txt
+
+# Running OpenDream locally
+tgstation.json

__odlint.dm

@@ -0,0 +1,10 @@
+// This file is included right at the start of the DME.
+// Its purpose is to enable multiple lints (pragmas) that are supported by OpenDream to better validate the codebase
+// These are essentially nitpicks the DM compiler should pick up on but doesnt
+
+#if !defined(SPACEMAN_DMM) && defined(OPENDREAM)
+// This is in a separate file as a hack to avoid SpacemanDMM
+// evaluating the #pragma lines, even if its outside a block it cares about
+// (Also so people can code-own it. Shoutout to AA)
+#include "tools/ci/od_lints.dm"
+#endif

code/__DEFINES/_helpers.dm

@@ -32,3 +32,7 @@
 // Custom types that we define don't get a unique id, but this is useful for identifying
 // types that don't normally have a way to run istype() on them.
 #define TYPEID(thing) copytext(REF(thing), 4, 6)
+
+/// A null statement to guard against EmptyBlock lint without necessitating the use of pass()
+/// Used to avoid proc-call overhead. But use sparingly. Probably pointless in most places.
+#define EMPTY_BLOCK_GUARD ;

code/__HELPERS/type2type.dm

@@ -36,8 +36,8 @@
 			return "northwest"
 		if(SOUTHWEST)
 			return "southwest"
-		else
-	return
+
+	return NONE
 
 //Turns text into proper directions
 /proc/text2dir(direction)
@@ -58,8 +58,8 @@
 			return SOUTHEAST
 		if("SOUTHWEST")
 			return SOUTHWEST
-		else
-	return
+
+	return NONE
 
 //Converts an angle (degrees) into a ss13 direction
 GLOBAL_LIST_INIT(modulo_angle_to_dir, list(NORTH,NORTHEAST,EAST,SOUTHEAST,SOUTH,SOUTHWEST,WEST,NORTHWEST))

code/_compile_options.dm

@@ -112,7 +112,7 @@
 #warn compiling in TESTING mode. testing() debug messages will be visible.
 #endif
 
-#ifdef CIBUILDING
+#if defined(CIBUILDING) && !defined(OPENDREAM)
 #define UNIT_TESTS
 #endif
 
@@ -137,10 +137,17 @@
 #define CBT
 #endif
 
-#if !defined(CBT) && !defined(SPACEMAN_DMM)
-#warn Building with Dream Maker is no longer supported and will result in errors.
-#warn In order to build, run BUILD.bat in the root directory.
-#warn Consider switching to VSCode editor instead, where you can press Ctrl+Shift+B to build.
+#if defined(OPENDREAM)
+	#if !defined(CIBUILDING)
+		#warn You are building with OpenDream. Remember to build TGUI manually.
+		#warn You can do this by running tgui-build.cmd from the bin directory.
+	#endif
+#else
+	#if !defined(CBT) && !defined(SPACEMAN_DMM)
+		#warn Building with Dream Maker is no longer supported and will result in errors.
+		#warn In order to build, run BUILD.cmd in the root directory.
+		#warn Consider switching to VSCode editor instead, where you can press Ctrl+Shift+B to build.
+	#endif
 #endif
 
 /// Runs the game in "map test mode"

code/_onclick/item_attack.dm

@@ -25,7 +25,7 @@
 			if (SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN)
 				return TRUE
 			if (SECONDARY_ATTACK_CONTINUE_CHAIN)
-				// Normal behavior
+				EMPTY_BLOCK_GUARD // Normal behavior
 			else
 				CRASH("pre_attack_secondary must return an SECONDARY_ATTACK_* define, please consult code/__DEFINES/combat.dm")
 	else
@@ -43,7 +43,7 @@
 			if (SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN)
 				return TRUE
 			if (SECONDARY_ATTACK_CONTINUE_CHAIN)
-				// Normal behavior
+				EMPTY_BLOCK_GUARD // Normal behavior
 			else
 				CRASH("attackby_secondary must return an SECONDARY_ATTACK_* define, please consult code/__DEFINES/combat.dm")
 	else

code/datums/components/food/edible.dm

@@ -251,7 +251,7 @@ Behavior that's still missing from this component that original food items had t
 	if(!(food_flags & FOOD_IN_CONTAINER))
 		switch(bitecount)
 			if(0)
-				// pass
+				pass()
 			if(1)
 				examine_list += span_notice("[owner] was bitten by someone!")
 			if(2, 3)

code/datums/wounds/burns.dm

@@ -82,11 +82,14 @@
 	infestation += infestation_rate * seconds_per_tick
 	switch(infestation)
 		if(0 to WOUND_INFECTION_MODERATE)
+			return
+
 		if(WOUND_INFECTION_MODERATE to WOUND_INFECTION_SEVERE)
 			if(SPT_PROB(15, seconds_per_tick))
 				victim.adjustToxLoss(0.2)
 				if(prob(6))
 					to_chat(victim, span_warning("The blisters on your [limb.plaintext_zone] ooze a strange pus..."))
+
 		if(WOUND_INFECTION_SEVERE to WOUND_INFECTION_CRITICAL)
 			if(!disabling)
 				if(SPT_PROB(1, seconds_per_tick))

code/game/atom/atom_defense.dm

@@ -94,17 +94,14 @@
 		CRASH("/atom/proc/run_atom_armor was called on [src] without being implemented as a type that uses integrity!")
 	if(damage_flag == MELEE && damage_amount < damage_deflection)
 		return 0
-	switch(damage_type)
-		if(BRUTE)
-		if(BURN)
-		else
-			return 0
+	if(damage_type != BRUTE && damage_type != BURN)
+		return 0
 	var/armor_protection = 0
 	if(damage_flag)
 		armor_protection = get_armor_rating(damage_flag)
 	if(armor_protection) //Only apply weak-against-armor/hollowpoint effects if there actually IS armor.
 		armor_protection = clamp(PENETRATE_ARMOUR(armor_protection, armour_penetration), min(armor_protection, 0), 100)
-	return round(damage_amount * (100 - armor_protection)*0.01, DAMAGE_PRECISION)
+	return round(damage_amount * (100 - armor_protection) * 0.01, DAMAGE_PRECISION)
 
 ///the sound played when the atom is damaged.
 /atom/proc/play_attack_sound(damage_amount, damage_type = BRUTE, damage_flag = 0)

code/game/atom/atoms_initializing_EXPENSIVE.dm

@@ -1,5 +1,6 @@
 /// Init this specific atom
 /datum/controller/subsystem/atoms/proc/InitAtom(atom/A, from_template = FALSE, list/arguments)
+
 	var/the_type = A.type
 
 	if(QDELING(A))
@@ -24,7 +25,7 @@
 
 	switch(result)
 		if (INITIALIZE_HINT_NORMAL)
-			// pass
+			EMPTY_BLOCK_GUARD // Pass
 		if(INITIALIZE_HINT_LATELOAD)
 			if(arguments[1]) //mapload
 				late_loaders += A

code/game/machinery/doors/airlock.dm

@@ -1522,9 +1522,8 @@
 
 	if(!disassembled)
 		A?.update_integrity(A.max_integrity * 0.5)
-	else if(obj_flags & EMAGGED)
-		//no electronics nothing
-	else
+
+	else if(!(obj_flags & EMAGGED))
 		var/obj/item/electronics/airlock/ae
 		if(!electronics)
 			ae = new/obj/item/electronics/airlock(loc)

code/modules/logging/log_holder.dm

@@ -340,7 +340,7 @@ GENERAL_PROTECT_DATUM(/datum/log_holder)
 		var/datum/data = data_list[key]
 
 		if(isnull(data))
-			// do nothing - nulls are allowed
+			pass() // nulls are allowed
 
 		else if(islist(data))
 			data = recursive_jsonify(data, semvers)

code/modules/reagents/chemistry/reagents/drinks/drink_reagents.dm

@@ -55,8 +55,6 @@
 	affected_mob.adjust_temp_blindness(-2 SECONDS * REM * seconds_per_tick)
 	var/need_mob_update
 	switch(current_cycle)
-		if(1 to 20)
-			//nothing
 		if(21 to 110)
 			if(SPT_PROB(100 * (1 - (sqrt(110 - current_cycle) / 10)), seconds_per_tick))
 				need_mob_update = affected_mob.adjustOrganLoss(ORGAN_SLOT_EYES, -2 * REM * seconds_per_tick)

tgstation.dme

@@ -13,6 +13,7 @@
 // END_PREFERENCES
 
 // BEGIN_INCLUDE
+#include "__odlint.dm"
 #include "_maps\_basemap.dm"
 #include "code\__byond_version_compat.dm"
 #include "code\_compile_options.dm"

tools/ci/od_lints.dm

@@ -0,0 +1,33 @@
+//1000-1999
+#pragma FileAlreadyIncluded error
+#pragma MissingIncludedFile error
+#pragma MisplacedDirective error
+#pragma UndefineMissingDirective error
+#pragma DefinedMissingParen error
+#pragma ErrorDirective error
+#pragma WarningDirective warning
+#pragma MiscapitalizedDirective error
+
+//2000-2999
+#pragma SoftReservedKeyword error
+#pragma DuplicateVariable error
+#pragma DuplicateProcDefinition error
+#pragma TooManyArguments error
+#pragma PointlessParentCall error
+#pragma PointlessBuiltinCall error
+#pragma SuspiciousMatrixCall error
+#pragma FallbackBuiltinArgument error
+#pragma MalformedRange error
+#pragma InvalidRange error
+#pragma InvalidSetStatement error
+#pragma InvalidOverride error
+#pragma DanglingVarType error
+#pragma MissingInterpolatedExpression error
+#pragma AmbiguousResourcePath error
+
+//3000-3999
+#pragma EmptyBlock error
+#pragma EmptyProc disabled
+#pragma UnsafeClientAccess disabled
+#pragma SuspiciousSwitchCase error
+#pragma AssignmentInConditional error