Martial arts improvements and additions (#6094)

-adds framework for weapons based martial arts, implementing a very basic swordsmanship
-makes the martial art books more modular
-fixes some minor issues with some of the martial art code
-adds amohdan swordsmen gear, to be used in a future event/sold by the merchant
- fixes #6083

code/game/objects/items/weapons/material/swords.dm

@@ -12,16 +12,51 @@
 	attack_verb = list("attacked", "slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	can_embed = 0
-	var/parry_chance = 50
+	var/parry_chance = 40
 
 /obj/item/weapon/material/sword/handle_shield(mob/user, var/damage, atom/damage_source = null, mob/attacker = null, var/def_zone = null, var/attack_text = "the attack")
+	var/parry_bonus = 1
 
-	if(default_parry_check(user, attacker, damage_source) && prob(parry_chance))
+	if(ishuman(user))
+		var/mob/living/carbon/human/H = user
+		if(H.martial_art && H.martial_art.weapon_affinity && istype(src, H.martial_art.weapon_affinity))
+			parry_bonus = H.martial_art.parry_multiplier
+
+	if(default_parry_check(user, attacker, damage_source) && prob(parry_chance * parry_bonus))
 		user.visible_message("<span class='danger'>\The [user] parries [attack_text] with \the [src]!</span>")
 		playsound(user.loc, 'sound/weapons/punchmiss.ogg', 50, 1)
 		return 1
 	return 0
 
+/obj/item/weapon/material/sword/perform_technique(var/mob/living/carbon/human/target, var/mob/living/carbon/human/user, var/target_zone)
+	var/armor_reduction = target.run_armor_check(target_zone,"melee")
+	var/obj/item/organ/external/affecting = target.get_organ(target_zone)
+	if(!affecting)
+		return
+
+	user.do_attack_animation(target)
+
+	if(target_zone == "head" || target_zone == "eyes" || target_zone == "mouth")
+		if(prob(70 - armor_reduction))
+			target.eye_blurry += 5
+			target.confused += 10
+			return TRUE
+
+	if(target_zone == "r_arm" || target_zone == "l_arm" || target_zone == "r_hand" || target_zone == "l_hand")
+		if(prob(80 - armor_reduction))
+			if(target_zone == "r_arm" || target_zone == "r_hand")
+				target.drop_r_hand()
+			else
+				target.drop_l_hand()
+			return TRUE
+
+	if(target_zone == "r_feet" || target_zone == "l_feet" || target_zone == "r_leg" || target_zone == "l_leg")
+		if(prob(60 - armor_reduction))
+			target.Weaken(5)
+			return TRUE
+
+	return FALSE
+
 /obj/item/weapon/material/sword/katana
 	name = "katana"
 	desc = "Woefully underpowered in D20. This one looks pretty sharp."
@@ -104,3 +139,12 @@
 	item_state = "gladius"
 	contained_sprite = 1
 	slot_flags = SLOT_BELT
+
+/obj/item/weapon/material/sword/amohdan_sword
+	name = "amohdan blade"
+	desc = "A tajaran sword, commonly used by the swordsmen of the island of Amohda."
+	icon = 'icons/obj/sword.dmi'
+	icon_state = "amohdan_sword"
+	item_state = "amohdan_sword"
+	contained_sprite = 1
+	slot_flags = SLOT_BELT