Add GitHub workflow and luacheck (#545)

David Leal

2020-06-12 a8daa417c485ee20716ec050d4c676b5c91af773

 technic/tools/chainsaw.lua

@@ -1,254 +1,368 @@
-- Configuration
local chainsaw_max_charge      = 30000 -- 30000 - Maximum charge of the saw
local chainsaw_charge_per_node = 12    -- 12    - Gives 2500 nodes on a single charge (about 50 complete normal trees)
local chainsaw_leaves          = true  -- true  - Cut down entire trees, leaves and all

-- The default stuff
local timber_nodenames={["default:jungletree"] = true,
                        ["default:papyrus"]    = true,
                        ["default:cactus"]     = true,
                        ["default:tree"]       = true,
                        ["default:apple"]      = true
local chainsaw_max_charge      = 30000 -- Maximum charge of the saw
-- Gives 2500 nodes on a single charge (about 50 complete normal trees)
local chainsaw_charge_per_node = 12
-- Cut down tree leaves.  Leaf decay may cause slowness on large trees
-- if this is disabled.
local chainsaw_leaves = true

-- First value is node name; second is whether the node is considered even if chainsaw_leaves is false.
local nodes = {
   -- The default trees
   {"default:acacia_tree", true},
   {"default:aspen_tree", true},
   {"default:jungletree", true},
   {"default:papyrus", true},
   {"default:cactus", true},
   {"default:tree", true},
   {"default:apple", true},
   {"default:pine_tree", true},
   {"default:acacia_leaves", false},
   {"default:aspen_leaves", false},
   {"default:leaves", false},
   {"default:jungleleaves", false},
   {"default:pine_needles", false},

   -- The default bushes
   {"default:acacia_bush_stem", true},
   {"default:bush_stem", true},
   {"default:pine_bush_stem", true},
   {"default:acacia_bush_leaves", false},
   {"default:blueberry_bush_leaves", false},
   {"default:blueberry_bush_leaves_with_berries", false},
   {"default:bush_leaves", false},
   {"default:pine_bush_needles", false},

   -- Rubber trees from moretrees or technic_worldgen if moretrees isn't installed
   {"moretrees:rubber_tree_trunk_empty", true},
   {"moretrees:rubber_tree_trunk", true},
   {"moretrees:rubber_tree_leaves", false},

   -- Support moretrees (trunk)
   {"moretrees:acacia_trunk", true},
   {"moretrees:apple_tree_trunk", true},
   {"moretrees:beech_trunk", true},
   {"moretrees:birch_trunk", true},
   {"moretrees:cedar_trunk", true},
   {"moretrees:date_palm_ffruit_trunk", true},
   {"moretrees:date_palm_fruit_trunk", true},
   {"moretrees:date_palm_mfruit_trunk", true},
   {"moretrees:date_palm_trunk", true},
   {"moretrees:fir_trunk", true},
   {"moretrees:jungletree_trunk", true},
   {"moretrees:oak_trunk", true},
   {"moretrees:palm_trunk", true},
   {"moretrees:palm_fruit_trunk", true},
   {"moretrees:palm_fruit_trunk_gen", true},
   {"moretrees:pine_trunk", true},
   {"moretrees:poplar_trunk", true},
   {"moretrees:sequoia_trunk", true},
   {"moretrees:spruce_trunk", true},
   {"moretrees:willow_trunk", true},
   -- Support moretrees (leaves)
   {"moretrees:acacia_leaves", false},
   {"moretrees:apple_tree_leaves", false},
   {"moretrees:beech_leaves", false},
   {"moretrees:birch_leaves", false},
   {"moretrees:cedar_leaves", false},
   {"moretrees:date_palm_leaves", false},
   {"moretrees:fir_leaves", false},
   {"moretrees:fir_leaves_bright", false},
   {"moretrees:jungletree_leaves_green", false},
   {"moretrees:jungletree_leaves_yellow", false},
   {"moretrees:jungletree_leaves_red", false},
   {"moretrees:oak_leaves", false},
   {"moretrees:palm_leaves", false},
   {"moretrees:poplar_leaves", false},
   {"moretrees:pine_leaves", false},
   {"moretrees:sequoia_leaves", false},
   {"moretrees:spruce_leaves", false},
   {"moretrees:willow_leaves", false},
   -- Support moretrees (fruit)
   {"moretrees:acorn", false},
   {"moretrees:apple_blossoms", false},
   {"moretrees:cedar_cone", false},
   {"moretrees:coconut", false},
   {"moretrees:coconut_0", false},
   {"moretrees:coconut_1", false},
   {"moretrees:coconut_2", false},
   {"moretrees:coconut_3", false},
   {"moretrees:dates_f0", false},
   {"moretrees:dates_f1", false},
   {"moretrees:dates_f2", false},
   {"moretrees:dates_f3", false},
   {"moretrees:dates_f4", false},
   {"moretrees:dates_fn", false},
   {"moretrees:dates_m0", false},
   {"moretrees:dates_n", false},
   {"moretrees:fir_cone", false},
   {"moretrees:pine_cone", false},
   {"moretrees:spruce_cone", false},

   -- Support growing_trees
   {"growing_trees:trunk", true},
   {"growing_trees:medium_trunk", true},
   {"growing_trees:big_trunk", true},
   {"growing_trees:trunk_top", true},
   {"growing_trees:trunk_sprout", true},
   {"growing_trees:branch_sprout", true},
   {"growing_trees:branch", true},
   {"growing_trees:branch_xmzm", true},
   {"growing_trees:branch_xpzm", true},
   {"growing_trees:branch_xmzp", true},
   {"growing_trees:branch_xpzp", true},
   {"growing_trees:branch_zz", true},
   {"growing_trees:branch_xx", true},
   {"growing_trees:leaves", false},

   -- Support cool_trees
   {"bamboo:trunk", true},
   {"bamboo:leaves", false},
   {"birch:trunk", true},
   {"birch:leaves", false},
   {"cherrytree:trunk", true},
   {"cherrytree:blossom_leaves", false},
   {"cherrytree:leaves", false},
   {"chestnuttree:trunk", true},
   {"chestnuttree:leaves", false},
   {"clementinetree:trunk", true},
   {"clementinetree:leaves", false},
   {"ebony:trunk", true},
   {"ebony:creeper", false},
   {"ebony:creeper_leaves", false},
   {"ebony:leaves", false},
   {"jacaranda:trunk", true},
   {"jacaranda:blossom_leaves", false},
   {"larch:trunk", true},
   {"larch:leaves", false},
   {"lemontree:trunk", true},
   {"lemontree:leaves", false},
   {"mahogany:trunk", true},
   {"mahogany:leaves", false},
   {"palm:trunk", true},
   {"palm:leaves", false},

   -- Support growing_cactus
   {"growing_cactus:sprout", true},
   {"growing_cactus:branch_sprout_vertical", true},
   {"growing_cactus:branch_sprout_vertical_fixed", true},
   {"growing_cactus:branch_sprout_xp", true},
   {"growing_cactus:branch_sprout_xm", true},
   {"growing_cactus:branch_sprout_zp", true},
   {"growing_cactus:branch_sprout_zm", true},
   {"growing_cactus:trunk", true},
   {"growing_cactus:branch_trunk", true},
   {"growing_cactus:branch", true},
   {"growing_cactus:branch_xp", true},
   {"growing_cactus:branch_xm", true},
   {"growing_cactus:branch_zp", true},
   {"growing_cactus:branch_zm", true},
   {"growing_cactus:branch_zz", true},
   {"growing_cactus:branch_xx", true},

   -- Support farming_plus
   {"farming_plus:banana_leaves", false},
   {"farming_plus:banana", false},
   {"farming_plus:cocoa_leaves", false},
   {"farming_plus:cocoa", false},

   -- Support nature
   {"nature:blossom", false},

   -- Support snow
   {"snow:needles", false},
   {"snow:needles_decorated", false},
   {"snow:star", false},

   -- Support vines (also generated by moretrees if available)
   {"vines:vines", false},

   {"trunks:moss", false},
   {"trunks:moss_fungus", false},
   {"trunks:treeroot", false},
}

if chainsaw_leaves == true then
   timber_nodenames["default:leaves"] = true
   timber_nodenames["default:jungleleaves"] = true
end

-- technic_worldgen defines rubber trees if moretrees isn't installed
if minetest.get_modpath("technic_worldgen") or
   minetest.get_modpath("moretrees") then
   timber_nodenames["moretrees:rubber_tree_trunk_empty"] = true
   timber_nodenames["moretrees:rubber_tree_trunk"]       = true
   if chainsaw_leaves then
                timber_nodenames["moretrees:rubber_tree_leaves"] = true
local timber_nodenames = {}
for _, node in pairs(nodes) do
   if chainsaw_leaves or node[2] then
      timber_nodenames[node[1]] = true
   end
end

-- Support moretrees if it is there
if( minetest.get_modpath("moretrees") ~= nil ) then
        timber_nodenames["moretrees:apple_tree_trunk"]                 = true
        timber_nodenames["moretrees:apple_tree_trunk_sideways"]        = true
        timber_nodenames["moretrees:beech_trunk"]                      = true
        timber_nodenames["moretrees:beech_trunk_sideways"]             = true
        timber_nodenames["moretrees:birch_trunk"]                      = true
        timber_nodenames["moretrees:birch_trunk_sideways"]             = true
        timber_nodenames["moretrees:fir_trunk"]                        = true
        timber_nodenames["moretrees:fir_trunk_sideways"]               = true
        timber_nodenames["moretrees:oak_trunk"]                        = true
        timber_nodenames["moretrees:oak_trunk_sideways"]               = true
        timber_nodenames["moretrees:palm_trunk"]                       = true
        timber_nodenames["moretrees:palm_trunk_sideways"]              = true
        timber_nodenames["moretrees:pine_trunk"]                       = true
        timber_nodenames["moretrees:pine_trunk_sideways"]              = true
        timber_nodenames["moretrees:rubber_tree_trunk_sideways"]       = true
        timber_nodenames["moretrees:rubber_tree_trunk_sideways_empty"] = true
        timber_nodenames["moretrees:sequoia_trunk"]                    = true
        timber_nodenames["moretrees:sequoia_trunk_sideways"]           = true
        timber_nodenames["moretrees:spruce_trunk"]                     = true
        timber_nodenames["moretrees:spruce_trunk_sideways"]            = true
        timber_nodenames["moretrees:willow_trunk"]                     = true
        timber_nodenames["moretrees:willow_trunk_sideways"]            = true
        timber_nodenames["moretrees:jungletree_trunk"]                 = true
        timber_nodenames["moretrees:jungletree_trunk_sideways"]        = true

        if chainsaw_leaves then
                timber_nodenames["moretrees:apple_tree_leaves"]        = true
                timber_nodenames["moretrees:oak_leaves"]               = true
                timber_nodenames["moretrees:fir_leaves"]               = true
                timber_nodenames["moretrees:fir_leaves_bright"]        = true
                timber_nodenames["moretrees:sequoia_leaves"]           = true
                timber_nodenames["moretrees:birch_leaves"]             = true
                timber_nodenames["moretrees:birch_leaves"]             = true
                timber_nodenames["moretrees:palm_leaves"]              = true
                timber_nodenames["moretrees:spruce_leaves"]            = true
                timber_nodenames["moretrees:spruce_leaves"]            = true
                timber_nodenames["moretrees:pine_leaves"]              = true
                timber_nodenames["moretrees:willow_leaves"]            = true
                timber_nodenames["moretrees:jungletree_leaves_green"]  = true
                timber_nodenames["moretrees:jungletree_leaves_yellow"] = true
                timber_nodenames["moretrees:jungletree_leaves_red"]    = true
        end
end

-- Support growing_trees if it is there
if( minetest.get_modpath("growing_trees") ~= nil ) then
        timber_nodenames["growing_trees:trunk"]         = true
        timber_nodenames["growing_trees:medium_trunk"]  = true
        timber_nodenames["growing_trees:big_trunk"]     = true
        timber_nodenames["growing_trees:trunk_top"]     = true
        timber_nodenames["growing_trees:trunk_sprout"]  = true
        timber_nodenames["growing_trees:branch_sprout"] = true
        timber_nodenames["growing_trees:branch"]        = true
        timber_nodenames["growing_trees:branch_xmzm"]   = true
        timber_nodenames["growing_trees:branch_xpzm"]   = true
        timber_nodenames["growing_trees:branch_xmzp"]   = true
        timber_nodenames["growing_trees:branch_xpzp"]   = true
        timber_nodenames["growing_trees:branch_zz"]     = true
        timber_nodenames["growing_trees:branch_xx"]     = true

        if chainsaw_leaves == true then
                timber_nodenames["growing_trees:leaves"] = true
        end
end

-- Support growing_cactus if it is there
if( minetest.get_modpath("growing_cactus") ~= nil ) then
        timber_nodenames["growing_cactus:sprout"]                       = true
        timber_nodenames["growing_cactus:branch_sprout_vertical"]       = true
        timber_nodenames["growing_cactus:branch_sprout_vertical_fixed"] = true
        timber_nodenames["growing_cactus:branch_sprout_xp"]             = true
        timber_nodenames["growing_cactus:branch_sprout_xm"]             = true
        timber_nodenames["growing_cactus:branch_sprout_zp"]             = true
        timber_nodenames["growing_cactus:branch_sprout_zm"]             = true
        timber_nodenames["growing_cactus:trunk"]                        = true
        timber_nodenames["growing_cactus:branch_trunk"]                 = true
        timber_nodenames["growing_cactus:branch"]                       = true
        timber_nodenames["growing_cactus:branch_xp"]                    = true
        timber_nodenames["growing_cactus:branch_xm"]                    = true
        timber_nodenames["growing_cactus:branch_zp"]                    = true
        timber_nodenames["growing_cactus:branch_zm"]                    = true
        timber_nodenames["growing_cactus:branch_zz"]                    = true
        timber_nodenames["growing_cactus:branch_xx"]                    = true
end

-- Support farming_plus if it is there
if( minetest.get_modpath("farming_plus") ~= nil ) then
   if chainsaw_leaves == true then
      timber_nodenames["farming_plus:cocoa_leaves"] = true
   end
end


local S = technic.getter

technic.register_power_tool("technic:chainsaw", chainsaw_max_charge)

-- Table for saving what was sawed down
local produced = nil
-- This function checks if the specified node should be sawed
local function check_if_node_sawed(pos)
   local node_name = minetest.get_node(pos).name
   if timber_nodenames[node_name]
         or (chainsaw_leaves and minetest.get_item_group(node_name, "leaves") ~= 0)
         or minetest.get_item_group(node_name, "tree") ~= 0 then
      return true
   end

-- Override the default handling routine to be able to count up the
-- items sawed down so that we can drop them i an nice single stack
local function chainsaw_handle_node_drops(pos, drops, digger)
        -- Add dropped items to list of collected nodes
        local _, dropped_item
        for _, dropped_item in ipairs(drops) do
                if produced[dropped_item] == nil then
                        produced[dropped_item] = 1
                else
                        produced[dropped_item] = produced[dropped_item] + 1
                end
        end
   return false
end

-- Table for saving what was sawed down
local produced = {}

-- Save the items sawed down so that we can drop them in a nice single stack
local function handle_drops(drops)
   for _, item in ipairs(drops) do
      local stack = ItemStack(item)
      local name = stack:get_name()
      local p = produced[name]
      if not p then
         produced[name] = stack
      else
         p:set_count(p:get_count() + stack:get_count())
      end
   end
end

--- Iterator over positions to try to saw around a sawed node.
-- This returns positions in a 3x1x3 area around the position, plus the
-- position above it.  This does not return the bottom position to prevent
-- the chainsaw from cutting down nodes below the cutting position.
-- @param pos Sawing position.
local function iterSawTries(pos)
   -- Copy position to prevent mangling it
   local pos = vector.new(pos)
   local i = 0

   return function()
      i = i + 1
      -- Given a (top view) area like so (where 5 is the starting position):
      -- X -->
      -- Z 123
      -- | 456
      -- V 789
      -- This will return positions 1, 4, 7, 2, 8 (skip 5), 3, 6, 9,
      -- and the position above 5.
      if i == 1 then
         -- Move to starting position
         pos.x = pos.x - 1
         pos.z = pos.z - 1
      elseif i == 4 or i == 7 then
         -- Move to next X and back to start of Z when we reach
         -- the end of a Z line.
         pos.x = pos.x + 1
         pos.z = pos.z - 2
      elseif i == 5 then
         -- Skip the middle position (we've already run on it)
         -- and double-increment the counter.
         pos.z = pos.z + 2
         i = i + 1
      elseif i <= 9 then
         -- Go to next Z.
         pos.z = pos.z + 1
      elseif i == 10 then
         -- Move back to center and up.
         -- The Y+ position must be last so that we don't dig
         -- straight upward and not come down (since the Y-
         -- position isn't checked).
         pos.x = pos.x - 1
         pos.z = pos.z - 1
         pos.y = pos.y + 1
      else
         return nil
      end
      return pos
   end
end

-- This function does all the hard work. Recursively we dig the node at hand
-- if it is in the table and then search the surroundings for more stuff to dig.
local function recursive_dig(pos, remaining_charge, player)
        local node=minetest.env:get_node(pos)
        local i=1
        -- Lookup node name in timber table:
        if timber_nodenames[node.name] ~= nil then
                -- Return if we are out of power
                if remaining_charge < chainsaw_charge_per_node then
                        return 0
                end
                local np
                -- wood found - cut it.
                minetest.env:dig_node(pos)
local function recursive_dig(pos, remaining_charge)
   if remaining_charge < chainsaw_charge_per_node then
      return remaining_charge
   end
   local node = minetest.get_node(pos)

                remaining_charge=remaining_charge-chainsaw_charge_per_node
                -- check surroundings and run recursively if any charge left
                np={x=pos.x+1, y=pos.y, z=pos.z}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                np={x=pos.x+1, y=pos.y, z=pos.z+1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                np={x=pos.x+1, y=pos.y, z=pos.z-1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
   if not check_if_node_sawed(pos) then
      return remaining_charge
   end

                np={x=pos.x-1, y=pos.y, z=pos.z}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                np={x=pos.x-1, y=pos.y, z=pos.z+1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                np={x=pos.x-1, y=pos.y, z=pos.z-1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
   -- Wood found - cut it
   handle_drops(minetest.get_node_drops(node.name, ""))
   minetest.remove_node(pos)
   remaining_charge = remaining_charge - chainsaw_charge_per_node

                np={x=pos.x, y=pos.y+1, z=pos.z}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end

                np={x=pos.x, y=pos.y, z=pos.z+1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                np={x=pos.x, y=pos.y, z=pos.z-1}
                if timber_nodenames[minetest.env:get_node(np).name] ~= nil then
                        remaining_charge = recursive_dig(np, remaining_charge)
                end
                return remaining_charge
        end
        -- Nothing sawed down
        return remaining_charge
   -- Check surroundings and run recursively if any charge left
   for npos in iterSawTries(pos) do
      if remaining_charge < chainsaw_charge_per_node then
         break
      end
      if check_if_node_sawed(npos) then
         remaining_charge = recursive_dig(npos, remaining_charge)
      else
         minetest.check_for_falling(npos)
      end
   end
   return remaining_charge
end

-- Saw down trees entry point
local function chainsaw_dig_it(pos, player,current_charge)
   if minetest.is_protected(pos, player:get_player_name()) then
      minetest.record_protection_violation(pos, player:get_player_name())
      return current_charge
-- Function to randomize positions for new node drops
local function get_drop_pos(pos)
   local drop_pos = {}

   for i = 0, 8 do
      -- Randomize position for a new drop
      drop_pos.x = pos.x + math.random(-3, 3)
      drop_pos.y = pos.y - 1
      drop_pos.z = pos.z + math.random(-3, 3)

      -- Move the randomized position upwards until
      -- the node is air or unloaded.
      for y = drop_pos.y, drop_pos.y + 5 do
         drop_pos.y = y
         local node = minetest.get_node_or_nil(drop_pos)

         if not node then
            -- If the node is not loaded yet simply drop
            -- the item at the original digging position.
            return pos
         elseif node.name == "air" then
            -- Add variation to the entity drop position,
            -- but don't let drops get too close to the edge
            drop_pos.x = drop_pos.x + (math.random() * 0.8) - 0.5
            drop_pos.z = drop_pos.z + (math.random() * 0.8) - 0.5
            return drop_pos
         end
      end
   end
        local remaining_charge=current_charge

        -- Save the currently installed dropping mechanism so we can restore it.
   local original_handle_node_drops = minetest.handle_node_drops
   -- Return the original position if this takes too long
   return pos
end

        -- A bit of trickery here: use a different node drop callback
        -- and restore the original afterwards.
        minetest.handle_node_drops = chainsaw_handle_node_drops
-- Chainsaw entry point
local function chainsaw_dig(pos, current_charge)
   -- Start sawing things down
   local remaining_charge = recursive_dig(pos, current_charge)
   minetest.sound_play("chainsaw", {pos = pos, gain = 1.0,
         max_hear_distance = 10})

        -- clear result and start sawing things down
        produced = {}
        remaining_charge = recursive_dig(pos, remaining_charge, player)
        minetest.sound_play("chainsaw", {pos = pos, gain = 1.0, max_hear_distance = 10,})
   -- Now drop items for the player
   for name, stack in pairs(produced) do
      -- Drop stacks of stack max or less
      local count, max = stack:get_count(), stack:get_stack_max()
      stack:set_count(max)
      while count > max do
         minetest.add_item(get_drop_pos(pos), stack)
         count = count - max
      end
      stack:set_count(count)
      minetest.add_item(get_drop_pos(pos), stack)
   end

        -- Restore the original noder drop handler
        minetest.handle_node_drops = original_handle_node_drops
   -- Clean up
   produced = {}

        -- Now drop items for the player
        local number, produced_item, p
        for produced_item,number in pairs(produced) do
                --print("ADDING ITEM: " .. produced_item .. " " .. number)
                -- Drop stacks of 99 or less
                p = {
                        x = pos.x + math.random()*4,
                        y = pos.y,
                        z = pos.z + math.random()*4
                }
                while number > 99 do
                        minetest.env:add_item(p, produced_item .. " 99")
                        p = {
                                x = pos.x + math.random()*4,
                                y = pos.y,
                                z = pos.z + math.random()*4
                        }
                        number = number - 99
                end
                minetest.env:add_item(p, produced_item .. " " .. number)
        end
        return remaining_charge
   return remaining_charge
end


@@ -262,29 +376,41 @@
      if pointed_thing.type ~= "node" then
         return itemstack
      end

      local meta = minetest.deserialize(itemstack:get_metadata())
      if not meta or not meta.charge then
         return
      end
      -- Send current charge to digging function so that the chainsaw will stop after digging a number of nodes.
      if meta.charge < chainsaw_charge_per_node then
      if not meta or not meta.charge or
            meta.charge < chainsaw_charge_per_node then
         return
      end

      local pos = minetest.get_pointed_thing_position(pointed_thing, above)
      meta.charge = chainsaw_dig_it(pos, user, meta.charge)
      technic.set_RE_wear(itemstack, meta.charge, chainsaw_max_charge)
      itemstack:set_metadata(minetest.serialize(meta))
      local name = user:get_player_name()
      if minetest.is_protected(pointed_thing.under, name) then
         minetest.record_protection_violation(pointed_thing.under, name)
         return
      end

      -- Send current charge to digging function so that the
      -- chainsaw will stop after digging a number of nodes
      meta.charge = chainsaw_dig(pointed_thing.under, meta.charge)
      if not technic.creative_mode then
         technic.set_RE_wear(itemstack, meta.charge, chainsaw_max_charge)
         itemstack:set_metadata(minetest.serialize(meta))
      end
      return itemstack
   end,
})

local mesecons_button = minetest.get_modpath("mesecons_button")
local trigger = mesecons_button and "mesecons_button:button_off" or "default:mese_crystal_fragment"

minetest.register_craft({
        output = 'technic:chainsaw',
        recipe = {
                {'technic:stainless_steel_ingot', 'technic:stainless_steel_ingot', 'technic:battery'},
                {'technic:stainless_steel_ingot', 'technic:motor',                 'technic:battery'},
                {'',                               '',                             'default:copper_ingot'},
        }
   output = "technic:chainsaw",
   recipe = {
      {"technic:stainless_steel_ingot", trigger,                      "technic:battery"},
      {"basic_materials:copper_wire",      "basic_materials:motor",              "technic:battery"},
      {"",                              "",                           "technic:stainless_steel_ingot"},
   },
   replacements = { {"basic_materials:copper_wire", "basic_materials:empty_spool"}, },

})