Firs version with only one power generator.

LICENSE

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+License of source code
+======================
+
+The MIT License (MIT)
+---------------------
+Copyright (C) 2021 SFENCE
+
+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.
+
+For more details:
+https://opensource.org/licenses/MIT
+
+Licenses of media
+=================
+
+Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+-------------------------------------------------------
+
+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+Attribution 3.0 Unported (CC BY 3.0)
+------------------------------------
+
+This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+CC0 1.0 Universal (CC0 1.0)
+---------------------------
+
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+
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+

README.md

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+Minetest Game mod: power_generators
+==================================
+
+This mod add liquid fuel powered generators into minetest worls.
+Generatos supports Minetest default game and Hades Revisited.
+Generators are powered by appliances mod API. So, on appliances APi based machines can easy access the power from generator.
+
+Authors of source code
+----------------------
+Copyright (c) 2021 SFENCE
+MIT - check LICENSE file
+
+Authors of media
+----------------
+
+Models
+------
+
+Copyright (c) 2021 SFENCE
+CC BY-SA 4.0 - check LICENSE file
+
+Textures
+--------
+
+Copyright (c) 2021 SFENCE
+CC BY-SA 4.0 - check LICENSE file
+
+Sounds
+------
+
+power_generators_emergency_generator_* - delivered from Generator StartUp, Run, Shutdown.wav sound (https://freesound.org/people/JeffWojo/sounds/169940/) by JeffWojo, license CC0 1.0
+

crafting.lua

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+
+local items = {
+  strong_ingot = "default:steel_ingot",
+  metal_ingot = "default:steel_ingot",
+  copper_ingot = "default:copper_ingot",
+  mese_fragment = "default:mese_crystal_fragment",
+  
+  copper_wire = "basic_materials:copper_wire",
+  empty_spool = "basic_materials:empty_spool",
+  controller = "basic_materials:ic",
+  
+  gear = "basic_materials:gear_steel",
+  electric_motor = "basic_materials:motor",
+  transforemr = "basic_materials:gold_wire",
+  
+  bar = "basic_materials:steel_bar",
+}
+
+if minetest.get_modpath("hades_core") then
+  items.strong_ingot = "hades_core:steel_ingot"
+  items.metal_ingot = "hades_core:steel_ingot"
+  items.copper_ingot = "hades_core:copper_ingot"
+  items.mese_fragment = "hades_core:mese_crystal_fragment"
+  
+  items.copper_wire = "hades_extramaterials:copper_wire"
+  items.empty_spool = "hades_extramaterials:empty_spool"
+  items.controller = "hades_extramaterials:ic"
+  
+  items.gear = "hades_extramaterials:gear_steel"
+  items.electric_motor = "hades_extramaterials:motor"
+  items.transformer = "hades_extramaterials:gold_wire"
+  
+  items.bar = "hades_extramaterials:steel_bar"
+end
+
+if minetest.get_modpath("technic") then
+  items.strong_ingot = "technic:stainless_steel_ingot"
+  items.metal_ingot = "technic:carbon_steel_ingot"
+  items.controller = "technic:control_logic_unit"
+  
+  items.transformer = "technic:lv_transformer"
+end
+
+if minetest.get_modpath("hades_technic") then
+  items.strong_ingot = "hades_technic:stainless_steel_ingot"
+  items.metal_ingot = "hades_technic:carbon_steel_ingot"
+  items.controller = "hades_technic:control_logic_unit"
+  
+  items.transformer = "hades_technic:lv_transformer"
+end
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_piston",
+    recipe = {
+      {items.strong_ingot, items.strong_ingot, items.strong_ingot},
+      {"", items.strong_ingot, ""},
+      {"", items.strong_ingot, ""},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_cylinder_body",
+    recipe = {
+      {items.strong_ingot, "", items.strong_ingot},
+      {items.strong_ingot, "", items.strong_ingot},
+      {items.strong_ingot, items.strong_ingot, items.strong_ingot},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_crankshaft 2",
+    recipe = {
+      {"", items.strong_ingot, items.strong_ingot},
+      {"", items.strong_ingot, ""},
+      {items.strong_ingot, items.strong_ingot, ""},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_spark_plug",
+    recipe = {
+      {items.copper_ingot, items.copper_wire, items.copper_ingot},
+      {"", items.mese_fragment, ""},
+    },
+    replacements = {{items.copper_wire,items.empty_spool}},
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_body_2",
+    recipe = {
+      {"power_generators:combustion_engine_spark_plug", items.metal_ingot, "power_generators:combustion_engine_spark_plug"},
+      {"power_generators:combustion_engine_piston", items.controller, "power_generators:combustion_engine_piston"},
+      {"power_generators:combustion_engine_cylinder_body", "power_generators:combustion_engine_crankshaft", "power_generators:combustion_engine_cylinder_body"},
+    }
+  })
+
+--[[
+minetest.register_craft({
+    output = "power_generators:combustion_engine_body_4",
+    recipe = {
+      {items.metal_ingot, items.metal_ingot, items.metal_ingot},
+      {"power_generators:combustion_engine_body_2","power_generators:combustion_engine_body_2"},
+      {"power_generators:combustion_engine_crankshaft","power_generators:combustion_engine_crankshaft"},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_body_6",
+    recipe = {
+      {items.metal_ingot, items.metal_ingot, items.metal_ingot},
+      {"power_generators:combustion_engine_body_2","power_generators:combustion_engine_body_2", "power_generators:combustion_engine_body_2"},
+      {"power_generators:combustion_engine_crankshaft","power_generators:combustion_engine_crankshaft","power_generators:combustion_engine_crankshaft"},
+    }
+  })
+--]]
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_two_cylinders",
+    recipe = {
+      {items.metal_ingot, items.controller, items.metal_ingot},
+      {items.copper_wire, "power_generators:combustion_engine_body_2", items.copper_wire},
+      {items.metal_ingot, items.bar, items.metal_ingot},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_gearbox",
+    recipe = {
+      {items.metal_ingot, items.gear, items.metal_ingot},
+      {items.metal_ingot, items.gear, items.metal_ingot},
+      {items.metal_ingot, items.gear, items.metal_ingot},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_alternator",
+    recipe = {
+      {"", items.transformer, ""},
+      {"", items.electric_motor, ""},
+      {items.metal_ingot, "", items.metal_ingot},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:combustion_engine_fuel_tank",
+    recipe = {
+      {items.metal_ingot, items.metal_ingot, items.metal_ingot},
+      {items.metal_ingot, "", items.metal_ingot},
+      {items.metal_ingot, items.metal_ingot, items.metal_ingot},
+    }
+  })
+
+minetest.register_craft({
+    output = "power_generators:emergency_generator",
+    recipe = {
+      {items.metal_ingot, "power_generators:combustion_engine_fuel_tank", items.metal_ingot},
+      {"power_generators:combustion_engine_two_cylinders", "power_generators:combustion_engine_gearbox", "power_generators:combustion_engine_alternator"},
+      {items.metal_ingot, "", items.metal_ingot},
+    },
+    replacements = {{items.copper_wire,items.empty_spool}},
+  })
+

craftitems.lua

@@ -0,0 +1,65 @@
+
+local S = power_generators.translator
+
+minetest.register_craftitem("power_generators:combustion_engine_piston", {
+    description = S("Combustion Engine Piston"),
+    inventory_image = "power_generators_combustion_engine_piston.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_cylinder_body", {
+    description = S("Combustion Engine Cylinder Body"),
+    inventory_image = "power_generators_combustion_engine_cylinder.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_crankshaft", {
+    description = S("Combustion Engine Crankshaft"),
+    inventory_image = "power_generators_combustion_engine_crankshaft.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_spark_plug", {
+    description = S("Combustion Engine Spark"),
+    inventory_image = "power_generators_combustion_engine_spark.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_body_2", {
+    description = S("Combustion Engine Body 2"),
+    inventory_image = "power_generators_combustion_engine_body_2.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_body_4", {
+    description = S("Combustion Engine Body 4"),
+    inventory_image = "power_generators_combustion_engine_body_4.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_body_6", {
+    description = S("Combustion Engine Body 6"),
+    inventory_image = "power_generators_combustion_engine_body_6.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_two_cylinders", {
+    description = S("Combustion Engine Two Cylinders"),
+    inventory_image = "power_generators_combustion_engine_two_cylinders.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_gearbox", {
+    description = S("Combustion Engine Gearbox"),
+    inventory_image = "power_generators_combustion_engine_gearbox.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_alternator", {
+    description = S("Combustion Engine Alternator"),
+    inventory_image = "power_generators_combustion_engine_alternator.png",
+  })
+
+minetest.register_craftitem("power_generators:combustion_engine_fuel_tank", {
+    description = S("Combustion Engine Fuel Tank"),
+    inventory_image = "power_generators_combustion_engine_fuel_tank.png",
+  })
+
+--[[
+minetest.register_craftitem("power_generators:combustion_engine_", {
+    description = S("Combustion Engine "),
+    inventory_image = "power_generators_combustion_engine_.png",
+  })
+--]]
+

emergency_generator.lua

@@ -0,0 +1,265 @@
+-------------------------
+-- Emergency Generator --
+-------------------------
+----- Ver 1.0 ---------
+-----------------------
+-- Initial Functions --
+-----------------------
+local S = power_generators.translator;
+
+power_generators.emergency_generator = appliances.appliance:new(
+    {
+      node_name_inactive = "power_generators:emergency_generator",
+      node_name_active = "power_generators:emergency_generator_active",
+      
+      node_description = S("Emergency generator"),
+    	node_help = S("Fill it with liquid fuel.").."\n"..S("Use this for generate energy.").."\n"..S("Startup and Shutdown by punch."),
+      
+      input_stack_size = 0,
+      have_input = false,
+      
+      power_connect_sides = {"front","back","right","left"},
+      
+      have_control = true,
+      
+      sounds = {
+        active_running = {
+          sound = "power_generators_emergency_generator_startup",
+          sound_param = {max_hear_distance = 32, gain = 1},
+          repeat_timer = 3,
+        },
+        waiting_running = {
+          sound = "power_generators_emergency_generator_startup",
+          sound_param = {max_hear_distance = 32, gain = 1},
+          repeat_timer = 3,
+        },
+        running = {
+          sound = "power_generators_emergency_generator_running",
+          sound_param = {max_hear_distance = 32, gain = 1},
+          repeat_timer = 1,
+        },
+        running_idle = {
+          sound = "power_generators_emergency_generator_shutdown",
+          sound_param = {max_hear_distance = 32, gain = 1},
+        },
+        running_nopower = {
+          sound = "power_generators_emergency_generator_shutdown",
+          sound_param = {max_hear_distance = 32, gain = 1},
+        },
+        running_waiting = {
+          sound = "power_generators_emergency_generator_shutdown",
+          sound_param = {max_hear_distance = 32, gain = 1},
+        },
+      },
+    })
+
+local emergency_generator = power_generators.emergency_generator
+
+emergency_generator:power_data_register(
+  {
+    ["time_power"] = {
+        run_speed = 1,
+        disable = {}
+      },
+  })
+emergency_generator:control_data_register(
+  {
+    ["punch_control"] = {
+      },
+  })
+
+--------------
+-- Formspec --
+--------------
+
+function emergency_generator:get_formspec(meta, production_percent, consumption_percent)
+  local progress = "";
+  
+  progress = "image[3.6,0.9;5.5,0.95;appliances_consumption_progress_bar.png^[transformR270]]";
+  if consumption_percent then
+    progress = "image[3.6,0.9;5.5,0.95;appliances_consumption_progress_bar.png^[lowpart:" ..
+            (consumption_percent) ..
+            ":appliances_consumption_progress_bar_full.png^[transformR270]]";
+  end
+  
+  
+  
+  local formspec =  "formspec_version[3]" .. "size[12.75,8.5]" ..
+                    "background[-1.25,-1.25;15,10;appliances_appliance_formspec.png]" ..
+                    progress..
+                    "list[current_player;main;1.5,3;8,4;]" ..
+                    "list[context;"..self.use_stack..";2,0.8;1,1;]"..
+                    "list[context;"..self.output_stack..";9.75,0.25;2,2;]" ..
+                    "listring[current_player;main]" ..
+                    "listring[context;"..self.use_stack.."]" ..
+                    "listring[current_player;main]" ..
+                    "listring[context;"..self.output_stack.."]" ..
+                    "listring[current_player;main]";
+  return formspec;
+end
+
+---------------
+-- Callbacks --
+---------------
+
+local function update_generator_supply(self, pos, use_usage)
+  local side_data = {};
+  local total_demand = 0;
+  for _,side in pairs(self.power_connect_sides) do
+    local side_pos = appliances.get_side_pos(pos, side);
+    local side_node = minetest.get_node(side_pos);
+    local side_def = minetest.registered_nodes[side_node.name];
+    if side_def and side_def._generator_connect_sides then
+      if appliances.is_connected_to(side_pos, pos, side_def._generator_connect_sides) then
+        local meta = minetest.get_meta(side_pos);
+        local demand = meta:get_int("generator_demand") or 0
+        if (demand>0) then
+          total_demand = total_demand + demand;
+          table.insert(side_data, {meta=meta,demand=demand});
+        else
+          meta:set_int("generator_input", 0)
+        end
+      end
+    end
+  end
+  
+  if (total_demand>0) then
+    local generator_output = 0;
+    if use_usage then
+      generator_output = use_usage.generator_output or 150;
+    end
+    local part = generator_output/total_demand;
+    
+    for _,side in pairs(side_data) do
+      side.meta:set_int("generator_input", math.floor(side.demand*part))
+    end
+  end
+end
+
+function emergency_generator:cb_on_production(timer_step)
+  update_generator_supply(self, timer_step.pos, timer_step.use_usage)
+end
+
+function emergency_generator:cb_deactivate(pos, meta)
+  update_generator_supply(self, pos, nil)
+end
+
+----------
+-- Node --
+----------
+
+local node_sounds = nil
+if minetest.get_modpath("default") then
+  node_sounds = default.node_sound_metal_defaults()
+end
+if minetest.get_modpath("hades_sounds") then
+  node_sounds = hades_sounds.node_sound_metal_defaults()
+end
+if minetest.get_modpath("sounds") then
+  node_sounds = sounds.node_metal()
+end
+
+local node_def = {
+    paramtype = "light",
+    paramtype2 = "facedir",
+    groups = {cracky = 2},
+    legacy_facedir_simple = true,
+    is_ground_content = false,
+    sounds = node_sounds,
+    drawtype = "mesh",
+    mesh = "power_generators_emergency_generator.obj",
+    use_texture_alpha = "clip",
+ }
+
+local node_inactive = {
+    tiles = {
+        "power_generators_emergency_generator_frame_lid_hose.png",
+        "power_generators_emergency_generator_front_panel_body.png",
+        "power_generators_emergency_generator_back_body.png",
+        "power_generators_emergency_generator_tank.png",
+        "power_generators_emergency_generator_cable.png",
+        "power_generators_emergency_generator_moving_parts.png",
+    },
+  }
+
+local node_active = {
+    tiles = {
+        "power_generators_emergency_generator_frame_lid_hose.png",
+        "power_generators_emergency_generator_front_panel_body.png",
+        "power_generators_emergency_generator_back_body.png",
+        "power_generators_emergency_generator_tank.png",
+        "power_generators_emergency_generator_cable.png",
+        {
+          image = "power_generators_emergency_generator_moving_parts_active.png",
+          backface_culling = false,
+          animation = {
+            type = "vertical_frames",
+            aspect_w = 16,
+            aspect_h = 16,
+            length = 1.5
+          }
+        }
+    },
+  }
+
+emergency_generator:register_nodes(node_def, node_inactive, node_active)
+
+-------------------------
+-- Recipe Registration --
+-------------------------
+
+local items = {
+  phial_fuel = "biofuel:phial_fuel",
+  phial_empty = "biofuel:phial",
+  bottle_fuel = "biofuel:bottle_fuel",
+  bottle_empty = "vessles:glass_bottle",
+  can_fuel = "biofuel:can_fuel",
+  can_empty = "biofuel:can",
+}
+
+if minetest.get_modpath("hades_biofuel") then
+  items.phial_fuel = "hades_biofuel:phial_fuel"
+  items.phial_empty = "hades_biofuel:phial"
+  items.bottle_fuel = "hades_biofuel:bottle_fuel"
+  items.bottle_empty = "vessles:glass_bottle"
+  items.can_fuel = "hades_biofuel:can_fuel"
+  items.can_empty = "hades_biofuel:can"
+end
+
+-- hope, temporary only support for biofuel withou vessels manageent
+if not minetest.registered_items[items.phial_empty] then
+  items.phial_empty = nil
+  items.bottle_empty = nil
+  items.can_empty = nil
+end
+
+emergency_generator:recipe_register_usage(
+	items.phial_fuel,
+	{
+		inputs = 1,
+		outputs = {items.phial_empty},
+		consumption_time = 2,
+		consumption_step_size = 1,
+    generator_output = 150,
+	});
+emergency_generator:recipe_register_usage(
+	items.bottle_fuel,
+	{
+		inputs = 1,
+		outputs = {items.bottle_empty},
+		consumption_time = 20,
+		consumption_step_size = 1,
+    generator_output = 150,
+	});
+emergency_generator:recipe_register_usage(
+	items.can_fuel,
+	{
+		inputs = 1,
+		outputs = {items.can_empty},
+		consumption_time = 160,
+		consumption_step_size = 1,
+    generator_output = 150,
+	});
+
+emergency_generator:register_recipes("power_generators_fuel", "")
+

init.lua

@@ -0,0 +1,20 @@
+
+power_generators = {
+  translator = minetest.get_translator("power_generators")
+}
+
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(modpath.."/power_supply.lua")
+
+appliances.register_craft_type("power_generators_fuel", {
+    description = "Generator fuel",
+    width = 1,
+    height = 1,
+  })
+
+dofile(modpath.."/emergency_generator.lua")
+
+dofile(modpath.."/craftitems.lua")
+dofile(modpath.."/crafting.lua")
+

mod.conf

@@ -0,0 +1,5 @@
+name = power_generators
+title = Add some power generators
+description = Add power generators based on appliances API.
+depends = appliances
+optional_depends = default, biofuel, basic_materials, hades_sounds, hades_biofuel, hades_extramaterials, sounds

models/power_generators_emergency_generator.mtl

@@ -0,0 +1,62 @@
+# Blender MTL File: 'None'
+# Material Count: 6
+
+newmtl back_body
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl cable
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl frame_lid_hose
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl front_panel_body
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl moving_parts
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl tank
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2

power_supply.lua

@@ -0,0 +1,33 @@
+
+-- register power supply to power generators
+
+local power_supply = {
+    is_powered = function (self, power_data, pos, meta)
+        local eu_input = meta:get_int("generator_input");
+        if (eu_input>=power_data.demand) then
+          return power_data.run_speed;
+        end
+        return 0;
+      end,
+    power_need = function (self, power_data, pos, meta)
+        meta:set_int("generator_demand", power_data.demand)
+      end,
+    power_idle = function (self, power_data, pos, meta)
+        meta:set_int("generator_demand", 0)
+      end,
+    update_node_def = function(self, power_data, node_def)
+        node_def.groups.generator_powered = 1;
+        node_def._generator_connect_sides = self.power_connect_sides;
+      end,
+  }
+appliances.add_power_supply("power_generators_power", power_supply)
+
+function power_generators.need_power(pos, gen_pos)
+  local node = minetest.get_node(pos);
+  if (minetest.get_item_group(node.name, "generator_powered")>0) then
+    
+  end
+  return 0;
+end
+
+