"Do nothing" dual wield preference (cmss13-devs#4504)

# About the pull request

This PR adds a third option to the dual wield preference which is just
"do nothing".

# Explain why it's good for the game

I hate that there isn't an option that just allows me to do my own thing
rather than the game dictating that something *must* happen: either
forced swap hands or forced fire both weapons.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog

:cl: Morrow
qol: "Do nothing" dual wield preference
/:cl:

code/__DEFINES/client_prefs.dm

@@ -1,6 +1,7 @@
 #define BE_ALIEN_AFTER_DEATH (1<<0)
 #define BE_AGENT (1<<1)
 
+//toggle_prefs bits from /datum/preferences
 #define TOGGLE_IGNORE_SELF (1<<0) // Determines whether you will not hurt yourself when clicking yourself
 #define TOGGLE_HELP_INTENT_SAFETY (1<<1) // Determines whether help intent will be completely harmless
 #define TOGGLE_MIDDLE_MOUSE_CLICK (1<<2) // This toggles whether selected ability for xeno uses middle mouse clicking or shift clicking
@@ -13,7 +14,7 @@
 												   // and put the empty magazine in your hand
 #define TOGGLE_AUTOMATIC_PUNCTUATION (1<<7) // Whether your sentences will automatically be punctuated with a period
 #define TOGGLE_COMBAT_CLICKDRAG_OVERRIDE (1<<8) // Whether disarm/harm intents cause clicks to trigger immediately when the mouse button is depressed.
-#define TOGGLE_ALTERNATING_DUAL_WIELD (1<<9) // Whether dual-wielding fires both guns at once or swaps between them.
+#define TOGGLE_ALTERNATING_DUAL_WIELD (1<<9) // Whether dual-wielding fires both guns at once or swaps between them, OUTDATED, used to update savefiles, now dual_wield_pref
 #define TOGGLE_FULLSCREEN (1<<10) // See /client/proc/toggle_fullscreen in client_procs.dm
 #define TOGGLE_MEMBER_PUBLIC (1<<11) //determines if you get a byond logo by your name in ooc if you're a member or not
 #define TOGGLE_OOC_FLAG (1<<12) // determines if your country flag appears by your name in ooc chat
@@ -32,3 +33,11 @@
 #define AGE_MIN 19 //youngest a character can be
 #define AGE_MAX 90 //oldest a character can be //no. you are not allowed to be 160.
 #define MAX_GEAR_COST 7 //Used in chargen for loadout limit.
+
+///dual_wield_pref from /datum/preferences
+///Fire both weapons when dual wielding
+#define DUAL_WIELD_FIRE 0
+///Swap to the other weapon when dual wielding
+#define DUAL_WIELD_SWAP 1
+///Do nothing when dual wielding
+#define DUAL_WIELD_NONE 2

code/modules/client/preferences.dm

@@ -77,6 +77,7 @@ var/const/MAX_SAVE_SLOTS = 10
 							)
 	var/ghost_vision_pref = GHOST_VISION_LEVEL_MID_NVG
 	var/ghost_orbit = GHOST_ORBIT_CIRCLE
+	var/dual_wield_pref = DUAL_WIELD_FIRE
 
 	//Synthetic specific preferences
 	var/synthetic_name = "Undefined"
@@ -619,13 +620,12 @@ var/const/MAX_SAVE_SLOTS = 10
 					</b> <a href='?_src_=prefs;preference=toggle_prefs;flag=[TOGGLE_AUTOMATIC_PUNCTUATION]'><b>[toggle_prefs & TOGGLE_AUTOMATIC_PUNCTUATION ? "On" : "Off"]</b></a><br>"
 			dat += "<b>Toggle Combat Click-Drag Override: \
 					</b> <a href='?_src_=prefs;preference=toggle_prefs;flag=[TOGGLE_COMBAT_CLICKDRAG_OVERRIDE]'><b>[toggle_prefs & TOGGLE_COMBAT_CLICKDRAG_OVERRIDE ? "On" : "Off"]</b></a><br>"
-			dat += "<b>Toggle Alternate-Fire Dual Wielding: \
-					</b> <a href='?_src_=prefs;preference=toggle_prefs;flag=[TOGGLE_ALTERNATING_DUAL_WIELD]'><b>[toggle_prefs & TOGGLE_ALTERNATING_DUAL_WIELD ? "On" : "Off"]</b></a><br>"
 			dat += "<b>Toggle Middle-Click Swap Hands: \
 					</b> <a href='?_src_=prefs;preference=toggle_prefs;flag=[TOGGLE_MIDDLE_MOUSE_SWAP_HANDS]'><b>[toggle_prefs & TOGGLE_MIDDLE_MOUSE_SWAP_HANDS ? "On" : "Off"]</b></a><br>"
 			dat += "<b>Toggle Vendors Vending to Hands: \
 					</b> <a href='?_src_=prefs;preference=toggle_prefs;flag=[TOGGLE_VEND_ITEM_TO_HAND]'><b>[toggle_prefs & TOGGLE_VEND_ITEM_TO_HAND ? "On" : "Off"]</b></a><br>"
 			dat += "<a href='?src=\ref[src];action=proccall;procpath=/client/proc/switch_item_animations'>Toggle Item Animations Detail Level</a><br>"
+			dat += "<a href='?src=\ref[src];action=proccall;procpath=/client/proc/toggle_dualwield'>Toggle Dual Wield Functionality</a><br>"
 		if(MENU_SPECIAL) //wart
 			dat += "<div id='column1'>"
 			dat += "<h2><b><u>ERT Settings:</u></b></h2>"

code/modules/client/preferences_savefile.dm

@@ -1,5 +1,5 @@
 #define SAVEFILE_VERSION_MIN 8
-#define SAVEFILE_VERSION_MAX 20
+#define SAVEFILE_VERSION_MAX 21
 
 //handles converting savefiles to new formats
 //MAKE SURE YOU KEEP THIS UP TO DATE!
@@ -80,6 +80,15 @@
 		sound_toggles |= (SOUND_ADMIN_MEME|SOUND_ADMIN_ATMOSPHERIC)
 		S["toggles_sound"] << sound_toggles
 
+	if(savefile_version < 21)
+		var/pref_toggles
+		S["toggle_prefs"] >> pref_toggles
+		if(pref_toggles & TOGGLE_ALTERNATING_DUAL_WIELD)
+			dual_wield_pref = DUAL_WIELD_SWAP
+		else
+			dual_wield_pref = DUAL_WIELD_FIRE
+		S["dual_wield_pref"] << dual_wield_pref
+
 	savefile_version = SAVEFILE_VERSION_MAX
 	return 1
 
@@ -125,6 +134,7 @@
 	S["toggles_langchat"] >> toggles_langchat
 	S["toggles_sound"] >> toggles_sound
 	S["toggle_prefs"] >> toggle_prefs
+	S["dual_wield_pref"] >> dual_wield_pref
 	S["toggles_flashing"] >> toggles_flashing
 	S["toggles_ert"] >> toggles_ert
 	S["toggles_admin"] >> toggles_admin
@@ -210,6 +220,7 @@
 	toggles_langchat = sanitize_integer(toggles_langchat, 0, SHORT_REAL_LIMIT, initial(toggles_langchat))
 	toggles_sound = sanitize_integer(toggles_sound, 0, SHORT_REAL_LIMIT, initial(toggles_sound))
 	toggle_prefs = sanitize_integer(toggle_prefs, 0, SHORT_REAL_LIMIT, initial(toggle_prefs))
+	dual_wield_pref = sanitize_integer(dual_wield_pref, 0, 2, initial(dual_wield_pref))
 	toggles_flashing= sanitize_integer(toggles_flashing, 0, SHORT_REAL_LIMIT, initial(toggles_flashing))
 	toggles_ert = sanitize_integer(toggles_ert, 0, SHORT_REAL_LIMIT, initial(toggles_ert))
 	toggles_admin = sanitize_integer(toggles_admin, 0, SHORT_REAL_LIMIT, initial(toggles_admin))
@@ -317,6 +328,7 @@
 	S["toggles_langchat"] << toggles_langchat
 	S["toggles_sound"] << toggles_sound
 	S["toggle_prefs"] << toggle_prefs
+	S["dual_wield_pref"] << dual_wield_pref
 	S["toggles_flashing"] << toggles_flashing
 	S["toggles_ert"] << toggles_ert
 	S["toggles_admin"] << toggles_admin

code/modules/client/preferences_toggles.dm

@@ -372,12 +372,21 @@
 		to_chat(src,SPAN_BOLDNOTICE( "Click-dragging now blocks clicks from going through."))
 	prefs.save_preferences()
 
-/client/proc/toggle_dualwield() //Toggle whether dual-wielding fires both guns at once or swaps between them.
-	prefs.toggle_prefs ^= TOGGLE_ALTERNATING_DUAL_WIELD
-	if(prefs.toggle_prefs & TOGGLE_ALTERNATING_DUAL_WIELD)
-		to_chat(src, SPAN_BOLDNOTICE("Dual-wielding now switches between guns, as long as the other gun is loaded."))
+///Toggle whether dual-wielding fires both guns at once or swaps between them.
+/client/proc/toggle_dualwield()
+	if(prefs.dual_wield_pref < DUAL_WIELD_NONE)
+		prefs.dual_wield_pref++
 	else
-		to_chat(src, SPAN_BOLDNOTICE("Dual-wielding now fires both guns simultaneously."))
+		prefs.dual_wield_pref = DUAL_WIELD_FIRE
+
+	switch(prefs.dual_wield_pref)
+		if(DUAL_WIELD_FIRE)
+			to_chat(src, SPAN_BOLDNOTICE("Dual-wielding now fires both guns simultaneously."))
+		if(DUAL_WIELD_SWAP)
+			to_chat(src, SPAN_BOLDNOTICE("Dual-wielding now switches between guns, as long as the other gun is loaded."))
+		if(DUAL_WIELD_NONE)
+			to_chat(src, SPAN_BOLDNOTICE("Dual-wielding now has no effect on how you fire."))
+
 	prefs.save_preferences()
 
 /client/proc/toggle_middle_mouse_swap_hands() //Toggle whether middle click swaps your hands

code/modules/projectiles/gun.dm

@@ -1214,10 +1214,11 @@ and you're good to go.
 		shots_fired++
 
 		if(dual_wield && !fired_by_akimbo)
-			if(user?.client?.prefs?.toggle_prefs & TOGGLE_ALTERNATING_DUAL_WIELD)
-				user.swap_hand()
-			else
-				INVOKE_ASYNC(akimbo, PROC_REF(Fire), target, user, params, 0, TRUE)
+			switch(user?.client?.prefs?.dual_wield_pref)
+				if(DUAL_WIELD_FIRE)
+					INVOKE_ASYNC(akimbo, PROC_REF(Fire), target, user, params, 0, TRUE)
+				if(DUAL_WIELD_SWAP)
+					user.swap_hand()
 
 	else
 		return TRUE
@@ -1456,10 +1457,11 @@ and you're good to go.
 		SEND_SIGNAL(user, COMSIG_MOB_FIRED_GUN, src)
 
 		if(dual_wield && !fired_by_akimbo)
-			if(user?.client?.prefs?.toggle_prefs & TOGGLE_ALTERNATING_DUAL_WIELD)
-				user.swap_hand()
-			else
-				INVOKE_ASYNC(akimbo, PROC_REF(attack), attacked_mob, user, TRUE)
+			switch(user?.client?.prefs?.dual_wield_pref)
+				if(DUAL_WIELD_FIRE)
+					INVOKE_ASYNC(akimbo, PROC_REF(attack), attacked_mob, user, TRUE)
+				if(DUAL_WIELD_SWAP)
+					user.swap_hand()
 
 		if(EXECUTION_CHECK) //Continue execution if on the correct intent. Accounts for change via the earlier do_after
 			user.visible_message(SPAN_DANGER("[user] has executed [attacked_mob] with [src]!"), SPAN_DANGER("You have executed [attacked_mob] with [src]!"), message_flags = CHAT_TYPE_WEAPON_USE)