Convert the modpack into a standalone game for the Minetest engine

Integrated into the game is most of minetest_game as the stable base

mods/digistuff/ioexpander.lua

@@ -0,0 +1,177 @@
+local explode_port_states = function(state)
+	local port = {}
+	port.a = state%2  == 1
+	port.b = state%4  >= 2
+	port.c = state%8  >= 4
+	port.d = state%16 >= 8
+	return port
+end
+
+local implode_port_states = function(port)
+	local state = 0
+	if port.a then state = state + 1 end
+	if port.b then state = state + 2 end
+	if port.c then state = state + 4 end
+	if port.d then state = state + 8 end
+	return state
+end
+
+local gettiles = function(state)
+	local tiles = {
+		"digistuff_ioexp_top.png",
+		"jeija_microcontroller_bottom.png",
+		"jeija_microcontroller_sides.png",
+		"jeija_microcontroller_sides.png",
+		"jeija_microcontroller_sides.png",
+		"jeija_microcontroller_sides.png"
+	}
+	local port = explode_port_states(state)
+	for p,v in pairs(port) do
+		if v then
+			tiles[1] = tiles[1].."^jeija_luacontroller_LED_"..string.upper(p)..".png"
+		end
+	end
+	return tiles
+end
+
+local ioexp_get_on_rules = function(state)
+	local port = explode_port_states(state)
+	local rules = {}
+	if port.a then table.insert(rules,vector.new(-1,0,0)) end
+	if port.b then table.insert(rules,vector.new(0,0,1)) end
+	if port.c then table.insert(rules,vector.new(1,0,0)) end
+	if port.d then table.insert(rules,vector.new(0,0,-1)) end
+	return rules
+end
+
+local ioexp_get_off_rules = function(state)
+	local port = explode_port_states(state)
+	local rules = {}
+	if not port.a then table.insert(rules,vector.new(-1,0,0)) end
+	if not port.b then table.insert(rules,vector.new(0,0,1)) end
+	if not port.c then table.insert(rules,vector.new(1,0,0)) end
+	if not port.d then table.insert(rules,vector.new(0,0,-1)) end
+	return rules
+end
+
+local ioexp_digiline_send = function(pos)
+	local meta = minetest.get_meta(pos)
+	local channel = meta:get_string("channel")
+	local port = {
+		a = meta:get_int("aon") == 1,
+		b = meta:get_int("bon") == 1,
+		c = meta:get_int("con") == 1,
+		d = meta:get_int("don") == 1,
+	}
+	local outstate = explode_port_states(meta:get_int("outstate"))
+	for k,v in pairs(outstate) do port[k] = port[k] or v end
+	digiline:receptor_send(pos,digiline.rules.default,channel,port)
+end
+
+local ioexp_handle_digilines = function(pos,node,channel,msg)
+	local meta = minetest.get_meta(pos)
+	if channel ~= meta:get_string("channel") then return end
+	if msg == "GET" then
+		ioexp_digiline_send(pos)
+		return
+	end
+	if type(msg) ~= "table" then return end
+	local state = implode_port_states(msg)
+	node.name = "digistuff:ioexpander_"..state
+	meta:set_int("outstate",state)
+	minetest.swap_node(pos,node)
+	for _,i in ipairs(ioexp_get_on_rules(state)) do
+		mesecon.receptor_on(pos,{i})
+	end
+	for _,i in ipairs(ioexp_get_off_rules(state)) do
+		mesecon.receptor_off(pos,{i})
+	end
+end
+
+local ioexp_rule_to_port = function(rule)
+	if     rule.x < 0 then return "a"
+	elseif rule.z > 0 then return "b"
+	elseif rule.x > 0 then return "c"
+	elseif rule.z < 0 then return "d" end
+end
+
+local ioexp_handle_mesecons = function(pos,_,rule,state)
+	local meta = minetest.get_meta(pos)
+	local port = ioexp_rule_to_port(rule)
+	if not port then return end
+	local meta = minetest.get_meta(pos)
+	meta:set_int(port.."on",state == "on" and 1 or 0)
+	ioexp_digiline_send(pos)
+end
+
+for i=0,15,1 do
+	local offstate = i == 0
+	minetest.register_node("digistuff:ioexpander_"..i, {
+		description = offstate and "Digilines I/O Expander" or string.format("Digilines I/O Expander (on state %X - you hacker you!)",i),
+		groups = offstate and {cracky = 3,} or {cracky = 3,not_in_creative_inventory = 1,},
+		on_construct = function(pos)
+			local meta = minetest.get_meta(pos)
+			meta:set_string("formspec","field[channel;Channel;${channel}")
+			meta:set_int("aon",0)
+			meta:set_int("bon",0)
+			meta:set_int("con",0)
+			meta:set_int("don",0)
+			meta:set_int("outstate",i)
+		end,
+		_digistuff_channelcopier_fieldname = "channel",
+		tiles = gettiles(i),
+		inventory_image = "digistuff_ioexp_top.png",
+		drawtype = "nodebox",
+		drop = "digistuff:ioexpander_0",
+		selection_box = {
+			--From luacontroller
+			type = "fixed",
+			fixed = { -8/16, -8/16, -8/16, 8/16, -5/16, 8/16 },
+		},
+		node_box = {
+			--From Luacontroller
+			type = "fixed",
+			fixed = {
+				{-8/16, -8/16, -8/16, 8/16, -7/16, 8/16}, -- Bottom slab
+				{-5/16, -7/16, -5/16, 5/16, -6/16, 5/16}, -- Circuit board
+				{-3/16, -6/16, -3/16, 3/16, -5/16, 3/16}, -- IC
+			}
+		},
+		paramtype = "light",
+		sunlight_propagates = true,
+		on_receive_fields = function(pos, formname, fields, sender)
+			local name = sender:get_player_name()
+			if minetest.is_protected(pos,name) and not minetest.check_player_privs(name,{protection_bypass=true}) then
+				minetest.record_protection_violation(pos,name)
+				return
+			end
+			local meta = minetest.get_meta(pos)
+			if fields.channel then meta:set_string("channel",fields.channel) end
+		end,
+		mesecons = {
+			effector = {
+				rules = ioexp_get_off_rules(i),
+				action_change = ioexp_handle_mesecons,
+			},
+			receptor = {
+				state = mesecon.state.on,
+				rules = ioexp_get_on_rules(i),
+			},
+		},
+		digiline = {
+			receptor = {},
+			effector = {
+				action = ioexp_handle_digilines,
+			},
+		},
+	})
+end
+
+minetest.register_craft({
+	output = "digistuff:ioexpander_0",
+	recipe = {
+		{"","mesecons:wire_00000000_off","",},
+		{"digilines:wire_std_00000000","basic_materials:silicon","mesecons:wire_00000000_off",},
+		{"","mesecons:wire_00000000_off","",},
+	}
+})