biogasmachines: gasifier machine added.

This machine is designed to extract Biogas from highly compressed
dry organic matter, such as fossil fuels (coal block) and straw.
It requires no fuel to avoid complex processing loops.
Its recipe base is expandable via API function.
All functionality and Tubelib integration is in place.

Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>

biogasmachines/depends.txt

@@ -1,5 +1,6 @@
 default
 bucket
+farming
 tubelib
 tubelib_addons1
 pipeworks?

biogasmachines/gasifier.lua

@@ -1,53 +1,673 @@
-
 --[[
 
-	Tubelib Biogas Burn
-	===================
+	=======================================================================
+	Tubelib Biogas Machines Mod
+	by Micu (c) 2018
 
 	Copyright (C) 2018 Michal Cieslakiewicz
 
-	LGPLv2.1+
-	See LICENSE.txt for more information
+	Gasifier is a machine designed to slowly extract Biogas from fossil
+	fuels and other compressed dry organic materials.
+	Basic recipe is conversion of Coal Block into Biogas (heavier leftover
+	fractions form Biofuel).  Another default recipe is clean and complete
+	transformation of Straw Block into some Biogas units.
+	Custom recipes can be added via simple API function.
 
-	gasifier.lua
+	Operational info:
+	* machine requires no extra fuel
+	* if there is nothing to process, machine enters standby mode; it
+	  will automatically pick up work as soon as any valid item is loaded
+	  into input (source) tray
+	* there is 1 tick gap between processing items to perform machinery
+	  cleaning and reload working tray; this is a design choice
+	* working tray can only be emptied when machine is stopped; this tray
+	  is auto-loaded, source material should always go into input container
+	* machine cannot be recovered unless input and output trays are all
+	  empty
+	* when active, due to high temperature inside, machine becomes a light
+	  source of level 5
 
-	Converts Coal Blocks to Biogas
+	License: LGPLv2.1+
+	=======================================================================
 	
 ]]--
 
+--[[
+	---------
+	Variables
+	---------
+]]--
+
+-- Biogas recipe table (key - source item name)
+local biogas_recipes = {}
+-- Biogas source table (indexed by numbers, used by formspec recipe hint bar)
+local biogas_sources = {}
+-- timing
+local TIMER_TICK_SEC = 1		-- Node timer tick
+local TICKS_TO_SLEEP = 5		-- Tubelib standby
+-- machine inventory
+local INV_H = 3				-- Inventory height (do not change)
+local INV_IN_W = 2			-- Input inventory width
+local INV_OUT_W = (6 - INV_IN_W)	-- Output inventory width
+
+--[[
+	----------------
+	Public functions
+	----------------
+]]--
+
+-- Add Biogas recipe
+-- Returns true if recipe added successfully, false if error or already present
+-- biogas_recipe = {
+-- 	input = "itemstring",		-- source item, always 1 (req)
+--	count = number,			-- biogas units produced (opt, def: 1)
+--	time = number,			-- production time in ticks (req, max: 99)
+--	extra = "itemstring" }		-- additional product (opt, def: nil)
+function biogasmachines.add_gasifier_recipe(biogas_recipe)
+	if not biogas_recipe then return false end
+	if not biogas_recipe.input or not biogas_recipe.time or
+	   biogas_recipe.time < 1 or biogas_recipe.time > 99 then
+		return false
+	end
+	local input_item = ItemStack(biogas_recipe.input)
+	if not input_item or input_item:get_count() > 1 then
+		return false
+	end
+	local input_name = input_item:get_name()
+	if not minetest.registered_items[input_name] then
+		return false
+	end
+	if biogas_recipes[input_name] then return false end
+	local extra_item = nil
+	if biogas_recipe.extra then
+		extra_item = ItemStack(biogas_recipe.extra)
+		if not minetest.registered_items[extra_item:get_name()] then
+			extra_item = nil
+		end
+	end
+	local count = 1
+	if biogas_recipe.count and biogas_recipe.count > 1 and
+	   biogas_recipe.count < 100 then
+		count = biogas_recipe.count
+	end
+	biogas_recipes[input_name] = {
+		count = count,
+		time = biogas_recipe.time,
+		extra = extra_item,
+	}
+	biogas_sources[#biogas_sources + 1] = input_name
+	return true
+end
+
+--[[
+	--------
+	Formspec
+	--------
+]]--
+
+-- static data for formspec
+local fmxy = { inv_h = tostring(INV_H),
+	inv_in_w = tostring(INV_IN_W),
+	mid_x = tostring(INV_IN_W + 0.5),
+	inv_out_w = tostring(INV_OUT_W),
+	inv_out_x = tostring(INV_IN_W + 2),
+}
+
+-- recipe hint
+local function formspec_recipe_hint_bar(recipe_idx)
+	if #biogas_sources == 0 or recipe_idx > #biogas_sources then
+		return ""
+	end
+	local input_item = biogas_sources[recipe_idx]
+	local input_desc = minetest.registered_nodes[input_item].description
+	local recipe = biogas_recipes[input_item]
+	return "label[0.5,3.25;Recipe]" ..
+	"image_button[1.5,3.3;0.5,0.5;;left;<]" ..
+	"label[2,3.25;" ..
+		string.format("%3d / %3d", recipe_idx, #biogas_sources) ..
+		"]" ..
+	"image_button[2.8,3.3;0.5,0.5;;right;>]" ..
+	"item_image[3.6,3.25;0.5,0.5;" .. input_item .. "]" ..
+	--"tooltip[3.6,3.25;0.5,0.5;" ..	-- not supported in 0.4.x
+	--	minetest.registered_nodes[input_item].description ..
+	--	";;]" ..
+	"image[4,3.25;0.5,0.5;tubelib_gui_arrow.png^[resize:16x16]" ..
+	"label[4.4,3.25;" ..
+		string.format("%2d sec", recipe.time * TIMER_TICK_SEC) ..
+		"]" ..
+	"image[5,3.25;0.5,0.5;tubelib_gui_arrow.png^[resize:16x16]" ..
+	"item_image[5.5,3.25;0.5,0.5;tubelib_addons1:biogas]" ..
+	"label[6,3.25;x " .. tostring(recipe.count) .. "]" ..
+	(recipe.extra and "item_image[6.5,3.25;0.5,0.5;" ..
+		recipe.extra:get_name() .. "]label[7,3.25;x " ..
+		tostring(recipe.extra:get_count()) .. "]" or "")
+end
+
+-- Parameters:
+-- state - tubelib state
+-- item_percent - item completion
+-- recipe_idx - index of recipe shown at hint bar
+-- show_icons - show image hints (bool)
+local function formspec(state, item_percent, recipe_idx, show_icons)
+	local inv_hint = show_icons and #biogas_sources > 0
+	local inv_key = inv_hint and biogas_sources[1] or ""
+	return "size[8,8.25]" ..
+	default.gui_bg ..
+	default.gui_bg_img ..
+	default.gui_slots ..
+	"list[context;src;0,0;" .. fmxy.inv_in_w .. "," .. fmxy.inv_h .. ";]" ..
+	(inv_hint and "item_image[0,0;1,1;" .. inv_key .. "]" or "") ..
+	"list[context;cur;" .. fmxy.mid_x .. ",0;1,1;]" ..
+	"image[" .. fmxy.mid_x .. ",1;1,1;gui_furnace_arrow_bg.png^[lowpart:" ..
+		tostring(item_percent) ..
+		":gui_furnace_arrow_fg.png^[transformR270]" ..
+	"image_button[" .. fmxy.mid_x .. ",2;1,1;" ..
+		tubelib.state_button(state) .. ";button;]" ..
+	formspec_recipe_hint_bar(recipe_idx) ..
+	(inv_hint and "item_image[" .. fmxy.inv_out_x ..
+		",0;1,1;tubelib_addons1:biogas]" or "") ..
+	"list[context;dst;" .. fmxy.inv_out_x .. ",0;" .. fmxy.inv_out_w ..
+		"," .. fmxy.inv_h .. ";]" ..
+	"list[current_player;main;0,4;8,1;]" ..
+	"list[current_player;main;0,5.25;8,3;8]" ..
+	"listring[context;dst]" ..
+	"listring[current_player;main]" ..
+	(state == tubelib.RUNNING and
+		"box[" .. fmxy.mid_x .. ",0;0.82,0.9;#9F3F1F]" or
+		"listring[context;cur]listring[current_player;main]") ..
+	"listring[context;src]" ..
+	"listring[current_player;main]" ..
+	default.get_hotbar_bg(0, 4)
+end
+
+--[[
+	-------
+	Helpers
+	-------
+]]--
+
+-- check if item is valid biogas source (bool)
+local function is_input_item(stack)
+	local stackname = stack:get_name()
+	return biogas_recipes[stackname] and true or false
+end
+
+-- get one source item (itemstack)
+local function get_input_item(inv, listname)
+	local stack = ItemStack({})
+	for i, _ in pairs(biogas_recipes) do
+		stack = inv:remove_item(listname, ItemStack(i .. " 1"))
+		if not stack:is_empty() then break end
+	end
+	return stack
+end
+
+local function gasifier_start(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	local recipe_idx = meta:get_int("recipe_idx")
+	local label = minetest.registered_nodes[node.name].description
+	meta:set_int("item_ticks", -1)
+	meta:set_int("running", TICKS_TO_SLEEP)
+	meta:set_string("infotext", label .. " " .. number .. ": running")
+	meta:set_string("formspec", formspec(tubelib.RUNNING, 0, recipe_idx, true))
+	node.name = "biogasmachines:gasifier_active"
+	minetest.swap_node(pos, node)
+	minetest.get_node_timer(pos):start(TIMER_TICK_SEC)
+	return false
+end
+
+local function gasifier_stop(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	local recipe_idx = meta:get_int("recipe_idx")
+	local label = minetest.registered_nodes[node.name].description
+	meta:set_int("item_ticks", -1)
+	meta:set_int("running", tubelib.STATE_STOPPED)
+	meta:set_string("infotext", label .. " " .. number .. ": stopped")
+	meta:set_string("formspec", formspec(tubelib.STOPPED, 0, recipe_idx, true))
+	node.name = "biogasmachines:gasifier"
+	minetest.swap_node(pos, node)
+        minetest.get_node_timer(pos):stop()
+        return false
+end
+
+local function gasifier_idle(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	local recipe_idx = meta:get_int("recipe_idx")
+	local label = minetest.registered_nodes[node.name].description
+	meta:set_int("item_ticks", -1)
+	meta:set_int("running", tubelib.STATE_STANDBY)
+	meta:set_string("infotext", label .. " " .. number .. ": standby")
+	meta:set_string("formspec", formspec(tubelib.STANDBY, 0, recipe_idx, true))
+	node.name = "biogasmachines:gasifier"
+	minetest.swap_node(pos, node)
+        minetest.get_node_timer(pos):start(TIMER_TICK_SEC * TICKS_TO_SLEEP)
+        return false
+end
+
+local function gasifier_fault(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	local recipe_idx = meta:get_int("recipe_idx")
+	local label = minetest.registered_nodes[node.name].description
+	meta:set_int("item_ticks", -1)
+	meta:set_int("running", tubelib.STATE_FAULT)
+	meta:set_string("infotext", label .. " " .. number .. ": fault")
+	meta:set_string("formspec", formspec(tubelib.FAULT, 0, recipe_idx, true))
+	node.name = "biogasmachines:gasifier"
+	minetest.swap_node(pos, node)
+	minetest.get_node_timer(pos):stop()
+	return false
+end
+
+local function update_recipe_hint_bar(pos)
+	local meta = minetest.get_meta(pos)
+	local recipe_idx = meta:get_int("recipe_idx")
+	local state = tubelib.state(meta:get_int("running"))
+	local item_name = meta:get_string("item_name")
+	local item_ticks = meta:get_int("item_ticks")
+	local item_pct = 0
+	if item_name ~= "" and item_ticks >= 0 then
+		local tot_ticks = biogas_recipes[item_name].time
+		item_pct = 100 * (tot_ticks - item_ticks) / tot_ticks
+	end
+	meta:set_string("formspec", formspec(state, item_pct, recipe_idx, true))
+end
+
+--[[
+	---------
+	Callbacks
+	---------
+]]--
+
+-- do not allow to dig non-empty machine
+local function can_dig(pos, player)
+	local meta = minetest.get_meta(pos);
+	local inv = meta:get_inventory()
+	return inv:is_empty("src") and inv:is_empty("dst")
+end
+
+-- cleanup after digging
+local function after_dig_node(pos, oldnode, oldmetadata, digger)
+	tubelib.remove_node(pos)
+end
+
+-- validate incoming items
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	if listname == "src" then
+		if is_input_item(stack) then
+			return stack:get_count()
+		else
+			return 0
+		end
+	elseif listname == "cur" or listname == "dst" then
+		return 0
+	end
+	return 0
+end
+
+-- validate items move
+local function allow_metadata_inventory_move(pos, from_list, from_index,
+					     to_list, to_index, count, player)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local stack = inv:get_stack(from_list, from_index)
+	return allow_metadata_inventory_put(pos, to_list, to_index, stack, player)
+end
+
+-- validate items retrieval
+local function allow_metadata_inventory_take(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	if listname == "cur" then
+		local meta = minetest.get_meta(pos)
+		if meta:get_int("running") > 0 then
+			return 0
+		end
+	end
+	return stack:get_count()
+end
+
+-- punch machine to see status info
+local function on_punch(pos, node, puncher, pointed_thing)
+	local meta = minetest.get_meta(pos)
+	local player_name = puncher:get_player_name()
+	if meta:get_string("owner") ~= player_name then
+		return false
+	end
+	local msgclr = { ["fault"] = "#FFBFBF",
+			 ["standby"] = "#BFFFFF",
+			 ["stopped"] = "#BFBFFF",
+			 ["running"] = "#BFFFBF"
+	}
+	local state = tubelib.statestring(meta:get_int("running"))
+	local pipe = tostring(biogasmachines.is_pipe_with_water(pos, node))
+	minetest.chat_send_player(player_name,
+		minetest.colorize("#FFFF00", "[Gasifier:" ..
+		meta:get_string("number") .. "]") .. " Status is " ..
+		minetest.colorize(msgclr[state], "\"" .. state .. "\""))
+	return true
+end
+
+-- formspec callback
+local function on_receive_fields(pos, formname, fields, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return
+	end
+	local meta = minetest.get_meta(pos)
+	local running = meta:get_int("running")
+	if fields and fields.button then
+		if running > 0 or running == tubelib.STATE_FAULT then
+			gasifier_stop(pos)
+		else
+			gasifier_start(pos)
+		end
+	end
+	if fields and (fields.left or fields.right) then
+		local recipe_idx = meta:get_int("recipe_idx")
+		if fields.left then
+			recipe_idx = math.max(recipe_idx - 1, 1)
+		end
+		if fields.right then
+			recipe_idx = math.min(recipe_idx + 1, #biogas_sources)
+		end
+		meta:set_int("recipe_idx", recipe_idx)
+		update_recipe_hint_bar(pos)
+	end
+end
+
+-- tick-based item production
+local function on_timer(pos, elapsed)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local label = minetest.registered_nodes[node.name].description
+	local number = meta:get_string("number")
+	local running = meta:get_int("running")
+	local itemcnt = meta:get_int("item_ticks")
+	local itemname = meta:get_string("item_name")
+	local prodtime = -1
+	if itemcnt < 0 or itemname == "" then
+		-- idle and ready, check for something to work with
+		if inv:is_empty("src") then
+			if running > 0 then
+				-- no source item, count towards standby
+				running = running - 1
+				meta:set_int("running", running)
+				if running == 0 then
+					return gasifier_idle(pos)
+				end
+			end
+			return true
+		end
+		if running == tubelib.STATE_STANDBY then
+			-- something to do, wake up and re-entry
+			return gasifier_start(pos)
+		end
+		-- choose item
+		local inputname = nil
+		for i, r in pairs(biogas_recipes) do
+			if inv:contains_item("src", ItemStack(i .. " 1")) and
+			   inv:room_for_item("dst",
+				ItemStack("tubelib_addons1:biogas " ..
+				tostring(r.count))) and
+			   (not r.extra or inv:room_for_item("dst", r.extra))
+			   then
+				inputname = i
+				prodtime = r.time
+				break
+			end
+		end
+		if not inputname then
+			return true
+		end
+		-- move item to working tray, next tick will start processing
+		local inp = inv:remove_item("src", ItemStack(inputname .. " 1"))
+		if inp:is_empty() then
+			return gasifier_fault(pos)	-- oops
+		end
+		inv:add_item("cur", inp)
+		meta:set_string("item_name", inputname)
+		itemcnt = prodtime
+	else
+		-- production tick
+		itemcnt = itemcnt - 1
+		if itemcnt == 0 then
+			inv:add_item("dst",
+				ItemStack("tubelib_addons1:biogas " ..
+				tostring(biogas_recipes[itemname].count)))
+			if biogas_recipes[itemname].extra then
+				inv:add_item("dst",
+					biogas_recipes[itemname].extra)
+			end
+			inv:set_stack("cur", 1, ItemStack({}))
+			meta:set_string("item_name", "")
+			itemcnt = -1
+		else
+			prodtime = biogas_recipes[itemname].time
+		end
+	end
+	meta:set_int("item_ticks", itemcnt)
+	meta:set_int("running", TICKS_TO_SLEEP)
+	meta:set_string("infotext", label .. " " .. number .. ": running")
+	meta:set_string("formspec", formspec(tubelib.RUNNING,
+		100 * (prodtime - itemcnt) / prodtime,
+		meta:get_int("recipe_idx"), true))
+	return true
+end
+
+--[[
+	-----------------
+	Node registration
+	-----------------
+]]--
 
 minetest.register_node("biogasmachines:gasifier", {
-	description = "Tubelib Coal Gasifier",
+	description = "Tubelib Gasifier",
 	tiles = {
 		-- up, down, right, left, back, front
 		"biogasmachines_gasifier_top.png",
-		"tubelib_front.png",
-		"tubelib_front.png",
-		"tubelib_front.png",
-		"tubelib_front.png",
-		"tubelib_front.png",
+		"biogasmachines_bottom.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png"
 	},
+
 	drawtype = "nodebox",
 	node_box = {
 		type = "fixed",
 		fixed = {
-			{-0.5, -0.5, -0.5, 0.5, 0.5, -0.375},
-			{-0.5, -0.5, 0.375, 0.5, 0.5, 0.5},
-			{-0.5, -0.5, -0.5, -0.375, 0.5, 0.5},
-			{0.375, -0.5, -0.5, 0.5, 0.5, 0.5},
-			{-0.375, -0.5, -0.375, 0.375, 0.375, 0.375},
+			{ -0.5, -0.5, -0.5, 0.5, 0.375, 0.5 },
+			{ -0.375, 0.375, -0.375, 0.375, 0.5, 0.375 },
 		},
         },
 	selection_box = {
 		type = "fixed",
-                fixed = {-0.5, -0.5, -0.5,   0.5, 0.5, 0.5},
+		fixed = { -0.5, -0.5, -0.5, 0.5, 0.375, 0.5 },
 	},
 
 	paramtype = "light",
 	sunlight_propagates = true,
 	paramtype2 = "facedir",
-	groups = {choppy=2, cracky=2, crumbly=2},
+	groups = { choppy = 2, cracky = 2, crumbly = 2 },
 	is_ground_content = false,
-	sounds = default.node_sound_wood_defaults(),
+	sounds = default.node_sound_metal_defaults(),
+
+	can_dig = can_dig,
+	after_dig_node = after_dig_node,
+	on_punch = on_punch,
+	on_rotate = screwdriver.disallow,
+	on_timer = on_timer,
+	on_receive_fields = on_receive_fields,
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_move = allow_metadata_inventory_move,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+
+	after_place_node = function(pos, placer, itemstack, pointed_thing)
+		local node = minetest.get_node(pos)
+		local meta = minetest.get_meta(pos)
+		local number = tubelib.add_node(pos, "biogasmachines:gasifier")
+		local inv = meta:get_inventory()
+		inv:set_size('src', INV_H * INV_IN_W)
+		inv:set_size('cur', 1)
+		inv:set_size('dst', INV_H * INV_OUT_W)
+		local label = minetest.registered_nodes[node.name].description
+		meta:set_string("number", number)
+		meta:set_string("owner", placer:get_player_name())
+		meta:set_int("running", tubelib.STATE_STOPPED)
+		meta:set_string("item_name", "")
+		meta:set_int("item_ticks", -1)
+		meta:set_int("recipe_idx", 1)
+		meta:set_string("infotext", label .. " " .. number .. ": stopped")
+		meta:set_string("formspec", formspec(tubelib.STOPPED, 0, 1, true))
+	end,
 })
 
+minetest.register_node("biogasmachines:gasifier_active", {
+	description = "Tubelib Gasifier",
+	tiles = {
+		-- up, down, right, left, back, front
+		{
+			image = "biogasmachines_gasifier_active_top.png",
+			backface_culling = false,
+			animation = {
+				type = "vertical_frames",
+				aspect_w = 32,
+				aspect_h = 32,
+				length = 4.0,
+			},
+		},
+		"biogasmachines_bottom.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png",
+		"biogasmachines_gasifier_side.png"
+	},
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+			{ -0.5, -0.5, -0.5, 0.5, 0.375, 0.5 },
+			{ -0.375, 0.375, -0.375, 0.375, 0.5, 0.375 },
+		},
+        },
+	selection_box = {
+		type = "fixed",
+		fixed = { -0.5, -0.5, -0.5, 0.5, 0.375, 0.5 },
+	},
+
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = { crumbly = 0, not_in_creative_inventory = 1 },
+	is_ground_content = false,
+	light_source = 5,
+	sounds = default.node_sound_metal_defaults(),
+
+	can_dig = can_dig,
+	after_dig_node = after_dig_node,
+	on_punch = on_punch,
+	on_rotate = screwdriver.disallow,
+	on_timer = on_timer,
+	on_receive_fields = on_receive_fields,
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_move = allow_metadata_inventory_move,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	drop = "biogasmachines:gasifier",
+})
+
+tubelib.register_node("biogasmachines:gasifier", { "biogasmachines:gasifier_active" }, {
+
+	on_push_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		if is_input_item(item) then
+			return tubelib.put_item(meta, "src", item)
+		end
+		return false
+	end,
+
+	on_pull_item = function(pos, side)
+		local meta = minetest.get_meta(pos)
+		return tubelib.get_item(meta, "dst")
+	end,
+
+	on_unpull_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		return tubelib.put_item(meta, "dst", item)
+	end,
+
+	on_recv_message = function(pos, topic, payload)
+		local meta = minetest.get_meta(pos)
+		if topic == "on" then
+			gasifier_start(pos)
+		elseif topic == "off" then
+			gasifier_stop(pos)
+		elseif topic == "state" then
+			return tubelib.statestring(meta:get_int("running"))
+		else
+			return "unsupported"
+		end
+	end,
+})
+
+--[[
+	--------
+	Crafting
+	--------
+]]--
+
+minetest.register_craft({
+	output = "biogasmachines:gasifier",
+	recipe = {
+		{ "default:steelblock", "default:glass", "default:steelblock" },
+		{ "default:mese_crystal", "default:gold_ingot", "tubelib:tube1" },
+		{ "group:wood", "default:gold_ingot", "group:wood" },
+	},
+})
+
+--[[
+	-------
+	Recipes
+	-------
+]]--
+
+biogasmachines.add_gasifier_recipe({
+	input = "default:coalblock",
+	count = 8,
+	time = 12,
+	extra = "tubelib_addons1:biofuel 1",
+})
+
+biogasmachines.add_gasifier_recipe({
+	input = "farming:straw",
+	count = 3,
+	time = 8,
+})
+
+-- Unified Inventory hints
+if minetest.get_modpath("unified_inventory") then
+	unified_inventory.register_craft_type("gasifier", {
+		description = "Gasifier",
+		icon = 'biogasmachines_gasifier_top.png',
+		width = 1,
+		height = 1,
+	})
+	for i, r in pairs(biogas_recipes) do
+		unified_inventory.register_craft({
+			type = "gasifier",
+			items = { i },
+			output = "tubelib_addons1:biogas " .. tostring(r.count),
+		})
+	end
+end

biogasmachines/init.lua

@@ -20,5 +20,5 @@ dofile(minetest.get_modpath("biogasmachines").."/functions.lua")
 -- machines
 dofile(minetest.get_modpath("biogasmachines").."/freezer.lua")
 dofile(minetest.get_modpath("biogasmachines").."/gasifier.lua")
-dofile(minetest.get_modpath("biogasmachines").."/gasfurnace.lua")
-dofile(minetest.get_modpath("biogasmachines").."/htcompressor.lua")
+--dofile(minetest.get_modpath("biogasmachines").."/gasfurnace.lua")
+--dofile(minetest.get_modpath("biogasmachines").."/htcompressor.lua")