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LICENSE

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+MIT License
+
+Copyright (c) 2019 Stix
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

api.lua

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+w_api = {}
+
+local w_engine = {}
+w_engine.players = {}
+
+function w_api.register_weapon(itemname, descrip)
+    minetest.register_craftitem(itemname, {
+        description = descrip.description,
+        inventory_image = descrip.inventory_image,
+        wield_scale = {x = 2, y = 2, z = 1} or descrip.wield_scale,
+        rays = descrip.rays or {dmg = 2, delay = 0.1, depth = 0.1, range = 4, spread = 10, amount = 4},
+        slash_dir = descrip.slash_dir or 0,
+        delay = descrip.delay or 0.5,
+        on_use = function(itemstack, user, pointed_thing)
+            local name = user:get_player_name()
+            local current = minetest.get_us_time() / 1000000
+            w_engine.players[name] = w_engine.players[name] or current
+            local interval = minetest.registered_items[itemname].rays.delay * (minetest.registered_items[itemname].rays.amount + 1)
+            --minetest.chat_send_all("interval: " .. interval)
+            if current - w_engine.players[name] > interval then
+                w_engine.players[name] = current
+                --minetest.chat_send_all("delay is over")
+                minetest.after(minetest.registered_items[itemname].delay, w_engine.swing, user, itemname)
+            end
+        end
+    })
+end
+
+function w_engine.swing(user, itemname)
+    if user then
+        local item = minetest.registered_items[itemname]
+        local delay = item.rays.delay or nil
+        local timer = 0
+        local depth = 0
+        local amount = item.rays.amount
+        if item.slash_dir == 0 then
+            mp = 1
+        elseif item.slash_dir == 1 then
+            mp = -1
+        end
+        minetest.chat_send_all(mp)
+
+        for i = (-amount * mp) / 2, (amount * mp) / 2, 1 * mp do
+            if delay then
+                minetest.after(timer, w_engine.do_raycast, user, item, i)
+                timer = timer + delay
+            else
+                w_engine.do_raycast(user, item, i)
+            end
+        end
+
+    end
+end
+
+function w_engine.do_raycast(user, item, count)
+    local cam_z = user:get_look_dir()
+    local cam_x = minetest.yaw_to_dir(user:get_look_yaw())
+    local p_pos = user:get_pos()
+    p_pos.y = p_pos.y + user:get_properties().eye_height or 1.625
+    local dir = vector.multiply(minetest.yaw_to_dir(math.rad(item.rays.spread * count)), item.rays.range)
+    local e_pos = vector.add(p_pos, vector.multiply(cam_z, dir.z))
+    e_pos = vector.add(e_pos, vector.multiply(cam_x, dir.x))
+    local depth = 0
+
+    for pointed_thing in minetest.raycast(p_pos, e_pos, true, false) do
+        --minetest.add_particle({pos = pointed_thing.intersection_point, expirationtime = 2, size = 2, collisiondetection = false, vertical = false, texture = "w_api_dust.png"})
+        if item.rays.depth and depth >= item.rays.depth then
+            return
+        end
+        w_engine.handle_ray(user, pointed_thing, item, e_pos2, depth)
+    end
+end
+
+function w_engine.handle_ray(user, pointed_thing, item, dir, depth)
+    --print("intesection normal: " .. dump(pointed_thing.intersection_normal))
+    --print(pointed_thing.intersection_normal)
+    if pointed_thing.type ~= "object" then
+        return           
+    elseif pointed_thing.type == "object" then
+        if pointed_thing.ref ~= user then
+            pointed_thing.ref:punch(user, 1.0, {full_punch_interval = 1.0, damage_groups = {fleshy = item.rays.dmg}})
+        end
+        local vel = user:get_player_velocity()
+        local spd = math.sqrt((vel.x * vel.x) + (vel.z * vel.z))
+        if spd <= 0 then
+            spd = 1
+        end
+        if pointed_thing.ref:is_player() and pointed_thing.ref ~= user then
+            pointed_thing.ref:add_player_velocity(vector.multiply(user:get_look_dir(), 2 * spd))
+        else
+            pointed_thing.ref:add_velocity(vector.multiply(user:get_look_dir(), 2 * spd))
+        end
+        if depth then
+            depth = depth + 1
+            return depth
+        end
+    end
+end

init.lua

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+local modpath = minetest.get_modpath(minetest.get_current_modname())
+dofile(modpath.."/api.lua")
+
+w_api.register_weapon("w_api:sword", {
+    description = "Large Sword",
+    inventory_image = "w_api_sword.png",
+    rays = {dmg = 2, delay = 0.1, depth = 1, range = 4, spread = 10, amount = 4},
+    delay = 0.3,
+    slash_dir = 0
+})

mod.conf

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+name = w_api
+author = Stix