FPGA: Add 'unary' value to talbe. Document

mesecons.tablecopy didn’t support recursive tables, while Minetest table.copy works well for them.

.gitignore

@@ -1 +1,3 @@
 *~
+*.patch
+*.diff

mesecons/util.lua

@@ -186,19 +186,11 @@ function mesecon.invertRule(r)
 	return vector.multiply(r, -1)
 end
 
-function mesecon.tablecopy(table) -- deep table copy
-	if type(table) ~= "table" then return table end -- no need to copy
-	local newtable = {}
-
-	for idx, item in pairs(table) do
-		if type(item) == "table" then
-			newtable[idx] = mesecon.tablecopy(item)
-		else
-			newtable[idx] = item
-		end
+function mesecon.tablecopy(obj) -- deep copy
+	if type(obj) == "table" then
+		return table.copy(obj)
 	end
-
-	return newtable
+	return obj
 end
 
 function mesecon.cmpAny(t1, t2)

mesecons_delayer/init.lua

@@ -33,19 +33,9 @@ end
 
 -- Register the 2 (states) x 4 (delay times) delayers
 
-for i = 1, 4 do
-local groups = {}
-if i == 1 then
-	groups = {bendy=2,snappy=1,dig_immediate=2}
-else
-	groups = {bendy=2,snappy=1,dig_immediate=2, not_in_creative_inventory=1}
-end
+local delaytime = { 0.1, 0.3, 0.5, 1.0 }
 
-local delaytime
-if 		i == 1 then delaytime = 0.1
-elseif	i == 2 then delaytime = 0.3
-elseif	i == 3 then delaytime = 0.5
-elseif	i == 4 then delaytime = 1.0 end
+for i = 1, 4 do
 
 local boxes = {
 	 { -6/16, -8/16, -6/16, 6/16, -7/16, 6/16 },		-- the main slab
@@ -61,19 +51,9 @@ local boxes = {
 	 { 6/16, -8/16, -1/16, 8/16, -7/16, 1/16 }
 }
 
-minetest.register_node("mesecons_delayer:delayer_off_"..tostring(i), {
-	description = "Delayer",
+-- Delayer definition defaults
+local def = {
 	drawtype = "nodebox",
-	tiles = {
-		"mesecons_delayer_off_"..tostring(i)..".png",
-		"mesecons_delayer_bottom.png",
-		"mesecons_delayer_ends_off.png",
-		"mesecons_delayer_ends_off.png",
-		"mesecons_delayer_sides_off.png",
-		"mesecons_delayer_sides_off.png"
-		},
-	inventory_image = "mesecons_delayer_off_1.png",
-	wield_image = "mesecons_delayer_off_1.png",
 	walkable = true,
 	selection_box = {
 		type = "fixed",
@@ -83,26 +63,46 @@ minetest.register_node("mesecons_delayer:delayer_off_"..tostring(i), {
 		type = "fixed",
 		fixed = boxes
 	},
-	groups = groups,
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
 	is_ground_content = false,
-	drop = 'mesecons_delayer:delayer_off_1',
-	on_punch = function (pos, node)
-		if node.name=="mesecons_delayer:delayer_off_1" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_off_2", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_off_2" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_off_3", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_off_3" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_off_4", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_off_4" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_off_1", param2=node.param2})
-		end
-	end,
-	delayer_time = delaytime,
-	delayer_onstate = "mesecons_delayer:delayer_on_"..tostring(i),
+	delayer_time = delaytime[i],
 	sounds = default.node_sound_stone_defaults(),
+	on_blast = mesecon.on_blastnode,
+	drop = "mesecons_delayer:delayer_off_1",
+}
+
+-- Deactivated delayer definition defaults
+local off_groups = {bendy=2,snappy=1,dig_immediate=2}
+if i > 1 then
+	off_groups.not_in_creative_inventory = 1
+end
+
+local off_state = {
+	description = "Delayer",
+	tiles = {
+		"mesecons_delayer_off_"..tostring(i)..".png",
+		"mesecons_delayer_bottom.png",
+		"mesecons_delayer_ends_off.png",
+		"mesecons_delayer_ends_off.png",
+		"mesecons_delayer_sides_off.png",
+		"mesecons_delayer_sides_off.png"
+	},
+	inventory_image = "mesecons_delayer_off_1.png",
+	wield_image = "mesecons_delayer_off_1.png",
+	groups = off_groups,
+	on_punch = function(pos, node, puncher)
+		if minetest.is_protected(pos, puncher and puncher:get_player_name()) then
+			return
+		end
+
+		minetest.swap_node(pos, {
+			name = "mesecons_delayer:delayer_off_"..tostring(i % 4 + 1),
+			param2 = node.param2
+		})
+	end,
+	delayer_onstate = "mesecons_delayer:delayer_on_"..tostring(i),
 	mesecons = {
 		receptor =
 		{
@@ -115,13 +115,15 @@ minetest.register_node("mesecons_delayer:delayer_off_"..tostring(i), {
 			action_on = delayer_activate
 		}
 	},
-	on_blast = mesecon.on_blastnode,
-})
+}
+for k, v in pairs(def) do
+	off_state[k] = off_state[k] or v
+end
+minetest.register_node("mesecons_delayer:delayer_off_"..tostring(i), off_state)
 
-
-minetest.register_node("mesecons_delayer:delayer_on_"..tostring(i), {
+-- Activated delayer definition defaults
+local on_state = {
 	description = "You hacker you",
-	drawtype = "nodebox",
 	tiles = {
 		"mesecons_delayer_on_"..tostring(i)..".png",
 		"mesecons_delayer_bottom.png",
@@ -129,36 +131,19 @@ minetest.register_node("mesecons_delayer:delayer_on_"..tostring(i), {
 		"mesecons_delayer_ends_on.png",
 		"mesecons_delayer_sides_on.png",
 		"mesecons_delayer_sides_on.png"
-		},
-	walkable = true,
-	selection_box = {
-		type = "fixed",
-		fixed = { -8/16, -8/16, -8/16, 8/16, -6/16, 8/16 },
-	},
-	node_box = {
-		type = "fixed",
-		fixed = boxes
 	},
 	groups = {bendy = 2, snappy = 1, dig_immediate = 2, not_in_creative_inventory = 1},
-	paramtype = "light",
-	paramtype2 = "facedir",
-	sunlight_propagates = true,
-	is_ground_content = false,
-	drop = 'mesecons_delayer:delayer_off_1',
-	on_punch = function (pos, node)
-		if node.name=="mesecons_delayer:delayer_on_1" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_on_2", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_on_2" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_on_3", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_on_3" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_on_4", param2=node.param2})
-		elseif node.name=="mesecons_delayer:delayer_on_4" then
-			minetest.swap_node(pos, {name = "mesecons_delayer:delayer_on_1", param2=node.param2})
+	on_punch = function(pos, node, puncher)
+		if minetest.is_protected(pos, puncher and puncher:get_player_name()) then
+			return
 		end
+
+		minetest.swap_node(pos, {
+			name = "mesecons_delayer:delayer_on_"..tostring(i % 4 + 1),
+			param2 = node.param2
+		})
 	end,
-	delayer_time = delaytime,
 	delayer_offstate = "mesecons_delayer:delayer_off_"..tostring(i),
-	sounds = default.node_sound_stone_defaults(),
 	mesecons = {
 		receptor =
 		{
@@ -171,8 +156,12 @@ minetest.register_node("mesecons_delayer:delayer_on_"..tostring(i), {
 			action_off = delayer_deactivate
 		}
 	},
-	on_blast = mesecon.on_blastnode,
-})
+}
+for k, v in pairs(def) do
+	on_state[k] = on_state[k] or v
+end
+minetest.register_node("mesecons_delayer:delayer_on_"..tostring(i), on_state)
+
 end
 
 minetest.register_craft({

mesecons_detector/doc/nodedetector/description.html

@@ -1,8 +1,11 @@
 The node detector is a receptor. It changes its state when either any node
 or a specific node is detected. Right-click it to set a nodename to scan for.
-It can also receive digiline signals. You can either send "GET" and it will
-respond with the detected nodename or you can send any other string and it will
-set this string as the node to scan for.
+It can also receive digiline signals. For example, you can send
+<code>{distance=4, scanname="default:dirt"}</code>
+to set distance to 4 and scan for dirt. You can omit either parameter.
+There is also a command parameter: <code>{command="get"}</code> will respond
+with the detected nodename and <code>{command="scan"}</code> will respond with
+a boolean using the distance and nodename of the detector.
 Nodenames must include the mod they reside in, so for instance default:dirt, not just dirt.
 The distance parameter specifies how many blocks are between the node detector and the node to detect.
 Automatic scanning with Mesecons output only works when the detector is in an active block, but Digilines queries always work.

mesecons_detector/init.lua

@@ -189,28 +189,49 @@ local function node_detector_scan(pos)
 		(frontname ~= "air" and frontname ~= "ignore" and scanname == "")
 end
 
+local function node_detector_send_node_name(pos, node, channel, meta)
+	local distance = meta:get_int("distance")
+	local distance_max = mesecon.setting("node_detector_distance_max", 10)
+	if distance < 0 then distance = 0 end
+	if distance > distance_max then distance = distance_max end
+	local nodename = minetest.get_node(
+		vector.subtract(pos, vector.multiply(minetest.facedir_to_dir(node.param2), distance + 1))
+	).name
+
+	digiline:receptor_send(pos, digiline.rules.default, channel, nodename)
+end
+
 -- set player name when receiving a digiline signal on a specific channel
 local node_detector_digiline = {
 	effector = {
 		action = function(pos, node, channel, msg)
 			local meta = minetest.get_meta(pos)
 
-			local distance = meta:get_int("distance")
-			local distance_max = mesecon.setting("node_detector_distance_max", 10)
-			if distance < 0 then distance = 0 end
-			if distance > distance_max then distance = distance_max end
-
 			if channel ~= meta:get_string("digiline_channel") then return end
 
-			if msg == GET_COMMAND then
-				local nodename = minetest.get_node(
-					vector.subtract(pos, vector.multiply(minetest.facedir_to_dir(node.param2), distance + 1))
-				).name
-
-				digiline:receptor_send(pos, digiline.rules.default, channel, nodename)
+			if type(msg) == "table" then
+				if msg.distance or msg.scanname then
+					if msg.distance then
+						meta:set_string("distance", msg.distance)
+					end
+					if msg.scanname then
+						meta:set_string("scanname", msg.scanname)
+					end
+					node_detector_make_formspec(pos)
+				end
+				if msg.command == "get" then
+					node_detector_send_node_name(pos, node, channel, meta)
+				elseif msg.command == "scan" then
+					local result = node_detector_scan(pos)
+					digiline:receptor_send(pos, digiline.rules.default, channel, result)
+				end
 			else
-				meta:set_string("scanname", msg)
-				node_detector_make_formspec(pos)
+				if msg == GET_COMMAND then
+					node_detector_send_node_name(pos, node, channel, meta)
+				else
+					meta:set_string("scanname", msg)
+					node_detector_make_formspec(pos)
+				end
 			end
 		end,
 	},

mesecons_fpga/init.lua

@@ -1,10 +1,11 @@
 local plg = {}
 plg.rules = {}
+-- per-player formspec positions
+plg.open_formspecs = {}
 
 local lcore = dofile(minetest.get_modpath(minetest.get_current_modname()) .. "/logic.lua")
 dofile(minetest.get_modpath(minetest.get_current_modname()) .. "/tool.lua")(plg)
 
-
 plg.register_nodes = function(template)
 	-- each loop is for one of the 4 IO ports
 	for a = 0, 1 do
@@ -93,16 +94,20 @@ plg.register_nodes({
 
 		meta:set_string("instr", lcore.serialize(is))
 		meta:set_int("valid", 0)
-		meta:set_string("formspec", plg.to_formspec_string(is))
 		meta:set_string("infotext", "FPGA")
 	end,
-	on_receive_fields = function(pos, formname, fields, sender)
-		if fields.program == nil then return end -- we only care when the user clicks "Program"
+	on_rightclick = function(pos, node, clicker)
+		if not minetest.is_player(clicker) then
+			return
+		end
 		local meta = minetest.get_meta(pos)
-		local is = plg.from_formspec_fields(fields)
+		local name = clicker:get_player_name()
+		-- Erase formspecs of old FPGAs
+		meta:set_string("formspec", "")
 
-		meta:set_string("instr", lcore.serialize(is))
-		plg.update_formspec(pos, is)
+		plg.open_formspecs[name] = pos
+		local is = lcore.deserialize(meta:get_string("instr"))
+		minetest.show_formspec(name, "mesecons:fpga", plg.to_formspec_string(is, nil))
 	end,
 	sounds = default.node_sound_stone_defaults(),
 	mesecons = {
@@ -116,6 +121,12 @@ plg.register_nodes({
 	},
 	after_dig_node = function(pos, node)
 		mesecon.receptor_off(pos, plg.rules[node.name])
+		for name, open_pos in pairs(plg.open_formspecs) do
+			if vector.equals(pos, open_pos) then
+				minetest.close_formspec(name, "mesecons:fpga")
+				plg.open_formspecs[name] = nil
+			end
+		end
 	end,
 	on_blast = mesecon.on_blastnode,
 	on_rotate = function(pos, node, user, mode)
@@ -153,13 +164,12 @@ plg.register_nodes({
 		end
 
 		meta:set_string("instr", lcore.serialize(instr))
-		plg.update_formspec(pos, instr)
+		plg.update_meta(pos, instr)
 		return true
 	end,
 })
 
-
-plg.to_formspec_string = function(is)
+plg.to_formspec_string = function(is, err)
 	local function dropdown_op(x, y, name, val)
 		local s = "dropdown[" .. tostring(x) .. "," .. tostring(y) .. ";"
 				.. "0.75,0.5;" .. name .. ";" -- the height seems to be ignored?
@@ -180,26 +190,20 @@ plg.to_formspec_string = function(is)
 		return s .. "]"
 	end
 	local function dropdown_action(x, y, name, val)
-		local s = "dropdown[" .. tostring(x) .. "," .. tostring(y) .. ";"
-				.. "1.125,0.5;" .. name .. ";" -- the height seems to be ignored?
-		s = s .. " , AND,  OR, NOT, XOR,NAND,   =,XNOR;"
-		if val == nil then
-			return s .. "0]" -- actually selects no field at all
+		local selected = 0
+		local titles = { " " }
+		for i, data in ipairs(lcore.get_operations()) do
+			titles[i + 1] = data.fs_name
+			if val == data.gate then
+				selected = i + 1
+			end
 		end
-		local mapping = {
-			["and"] = 1,
-			["or"] = 2,
-			["not"] = 3,
-			["xor"] = 4,
-			["nand"] = 5,
-			["buf"] = 6,
-			["xnor"] = 7,
-		}
-		return s .. tostring(1 + mapping[val]) .. "]"
+		return ("dropdown[%f,%f;1.125,0.5;%s;%s;%i]"):format(
+			x, y, name, table.concat(titles, ","), selected)
 	end
 	local s = "size[9,9]"..
 		"label[3.4,-0.15;FPGA gate configuration]"..
-		"button_exit[7,7.5;2,2.5;program;Program]"..
+		"button[7,7.5;2,2.5;program;Program]"..
 		"box[4.2,0.5;0.03,7;#ffffff]"..
 		"label[0.25,0.25;op. 1]"..
 		"label[1.0,0.25;gate type]"..
@@ -225,6 +229,12 @@ plg.to_formspec_string = function(is)
 			y = 1 - 0.25
 		end
 	end
+	if err then
+		local fmsg = minetest.colorize("#ff0000", minetest.formspec_escape(err.msg))
+		s = s .. plg.red_box_around(err.i) ..
+			"label[0.25,8.25;The gate configuration is erroneous in the marked area:]"..
+			"label[0.25,8.5;" .. fmsg .. "]"
+	end
 	return s
 end
 
@@ -239,20 +249,11 @@ plg.from_formspec_fields = function(fields)
 		end
 	end
 	local function read_action(s)
-		if s == nil or s == " " then
-			return nil
+		for i, data in ipairs(lcore.get_operations()) do
+			if data.fs_name == s then
+				return data.gate
+			end
 		end
-		local mapping = {
-			["AND"] = "and",
-			["OR"] = "or",
-			["NOT"] = "not",
-			["XOR"] = "xor",
-			["NAND"] = "nand",
-			["="] = "buf",
-			["XNOR"] = "xnor",
-		}
-		s = s:gsub("^%s*", "") -- remove leading spaces
-		return mapping[s]
 	end
 	local is = {}
 	for i = 1, 14 do
@@ -266,12 +267,11 @@ plg.from_formspec_fields = function(fields)
 	return is
 end
 
-plg.update_formspec = function(pos, is)
+plg.update_meta = function(pos, is)
 	if type(is) == "string" then -- serialized string
 		is = lcore.deserialize(is)
 	end
 	local meta = minetest.get_meta(pos)
-	local form = plg.to_formspec_string(is)
 
 	local err = lcore.validate(is)
 	if err == nil then
@@ -280,17 +280,20 @@ plg.update_formspec = function(pos, is)
 	else
 		meta:set_int("valid", 0)
 		meta:set_string("infotext", "FPGA")
-		local fmsg = minetest.colorize("#ff0000", minetest.formspec_escape(err.msg))
-		form = form .. plg.red_box_around(err.i) ..
-			"label[0.25,8.25;The gate configuration is erroneous in the marked area:]"..
-			"label[0.25,8.5;" .. fmsg .. "]"
 	end
 
-	meta:set_string("formspec", form)
-
 	-- reset ports and run programmed logic
 	plg.setports(pos, false, false, false, false)
 	plg.update(pos)
+
+	-- Refresh open formspecs
+	local form = plg.to_formspec_string(is, err)
+	for name, open_pos in pairs(plg.open_formspecs) do
+		if vector.equals(pos, open_pos) then
+			minetest.show_formspec(name, "mesecons:fpga", form)
+		end
+	end
+	return err
 end
 
 plg.red_box_around = function(i)
@@ -409,6 +412,38 @@ plg.setports = function(pos, A, B, C, D) -- sets states of OUTPUT
 	end
 end
 
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local player_name = player:get_player_name()
+
+	if formname ~= "mesecons:fpga" or fields.quit then
+		plg.open_formspecs[player_name] = nil -- potential garbage
+		return
+	end
+	if not fields.program then
+		return -- we only care when the user clicks "Program"
+	end
+	local pos = plg.open_formspecs[player_name]
+	if minetest.is_protected(pos, player_name) then
+		minetest.record_protection_violation(pos, player_name)
+		return
+	end
+
+	local meta = minetest.get_meta(pos)
+	local is = plg.from_formspec_fields(fields)
+
+	meta:set_string("instr", lcore.serialize(is))
+	local err = plg.update_meta(pos, is)
+
+	if not err then
+		plg.open_formspecs[player_name] = nil
+		-- Close on success
+		minetest.close_formspec(player_name, "mesecons:fpga")
+	end
+end)
+
+minetest.register_on_leaveplayer(function(player)
+	plg.open_formspecs[player:get_player_name()] = nil
+end)
 
 minetest.register_craft({
 	output = "mesecons_fpga:fpga0000 2",

mesecons_fpga/logic.lua

@@ -1,5 +1,27 @@
+
 local lg = {}
 
+local operations = {
+	-- table index: Index in the formspec dropdown
+	-- gate:    Internal name
+	-- short:   Serialized form, single character
+	-- fs_name: Display name, padded to 4 characters
+	-- func:    Function that applies the operation
+	-- unary:   Whether this gate only has one input
+	{ gate = "and",  short = "&", fs_name = " AND", func = function(a, b) return a and b end },
+	{ gate = "or",   short = "|", fs_name = "  OR", func = function(a, b) return a or b end },
+	{ gate = "not",  short = "~", fs_name = " NOT", func = function(a, b) return not b end, unary = true },
+	{ gate = "xor",  short = "^", fs_name = " XOR", func = function(a, b) return a ~= b end },
+	{ gate = "nand", short = "?", fs_name = "NAND", func = function(a, b) return not (a and b) end },
+	{ gate = "buf",  short = "_", fs_name = "   =", func = function(a, b) return b end, unary = true },
+	{ gate = "xnor", short = "=", fs_name = "XNOR", func = function(a, b) return a == b end },
+	{ gate = "nor",  short = "!", fs_name = " NOR", func = function(a, b) return not (a or b) end },
+}
+
+lg.get_operations = function()
+	return operations
+end
+
 -- (de)serialize
 lg.serialize = function(t)
 	local function _op(t)
@@ -11,20 +33,14 @@ lg.serialize = function(t)
 			return tostring(t.n)
 		end
 	end
-	local function _action(s)
-		if s == nil then
-			return " "
+	-- Serialize actions (gates) from eg. "and" to "&"
+	local function _action(action)
+		for i, data in ipairs(operations) do
+			if data.gate == action then
+				return data.short
+			end
 		end
-		local mapping = {
-			["and"] = "&",
-			["or"] = "|",
-			["not"] = "~",
-			["xor"] = "^",
-			["nand"] = "?", --dunno
-			["buf"] = "_",
-			["xnor"] = "=",
-		}
-		return mapping[s]
+		return " "
 	end
 
 	local s = ""
@@ -48,18 +64,14 @@ lg.deserialize = function(s)
 			return {type = "reg", n = tonumber(c)}
 		end
 	end
-	local function _action(c)
-		local mapping = {
-			["&"] = "and",
-			["|"] = "or",
-			["~"] = "not",
-			["^"] = "xor",
-			["?"] = "nand",
-			["_"] = "buf",
-			["="] = "xnor",
-			[" "] = nil,
-		}
-		return mapping[c]
+	-- Deserialize actions (gates) from eg. "&" to "and"
+	local function _action(action)
+		for i, data in ipairs(operations) do
+			if data.short == action then
+				return data.gate
+			end
+		end
+		-- nil
 	end
 
 	local ret = {}
@@ -109,16 +121,25 @@ lg.validate_single = function(t, i)
 		return false
 	end
 	local elem = t[i]
+
+	local gate_data
+	for j, data in ipairs(operations) do
+		if data.gate == elem.action then
+			gate_data = data
+			break
+		end
+	end
+
 	-- check for completeness
-	if elem.action == nil then
-		return {i = i, msg = "Gate type required"}
-	elseif elem.action == "not" or elem.action == "buf" then
+	if not gate_data then
+		return {i = i, msg = "Gate type is required"}
+	elseif gate_data.unary then
 		if elem.op1 ~= nil or elem.op2 == nil or elem.dst == nil then
-			return {i = i, msg = "Second operand (only) and destination required"}
+			return {i = i, msg = "Second operand (only) and destination are required"}
 		end
 	else
 		if elem.op1 == nil or elem.op2 == nil or elem.dst == nil then
-			return {i = i, msg = "Operands and destination required"}
+			return {i = i, msg = "Operands and destination are required"}
 		end
 	end
 	-- check whether operands/destination are identical
@@ -159,21 +180,12 @@ end
 -- interpreter
 lg.interpret = function(t, a, b, c, d)
 	local function _action(s, v1, v2)
-		if s == "and" then
-			return v1 and v2
-		elseif s == "or" then
-			return v1 or v2
-		elseif s == "not" then
-			return not v2
-		elseif s == "xor" then
-			return v1 ~= v2
-		elseif s == "nand" then
-			return not (v1 and v2)
-		elseif s == "buf" then
-			return v2
-		else -- s == "xnor"
-			return v1 == v2
+		for i, data in ipairs(operations) do
+			if data.gate == s then
+				return data.func(v1, v2)
+			end
 		end
+		return false -- unknown gate
 	end
 	local function _op(t, regs, io_in)
 		if t.type == "reg" then

mesecons_fpga/tool.lua

@@ -22,7 +22,7 @@ minetest.register_tool("mesecons_fpga:programmer", {
 		end
 		itemstack:set_metadata(meta:get_string("instr"))
 		minetest.chat_send_player(placer:get_player_name(), "FPGA gate configuration was successfully copied!")
-		
+
 		return itemstack
 	end,
 	on_use = function(itemstack, user, pointed_thing)
@@ -34,17 +34,22 @@ minetest.register_tool("mesecons_fpga:programmer", {
 		if minetest.get_node(pos).name:find("mesecons_fpga:fpga") ~= 1 then
 			return itemstack
 		end
+		local player_name = user:get_player_name()
+		if minetest.is_protected(pos, player_name) then
+			minetest.record_protection_violation(pos, player_name)
+			return itemstack
+		end
 
 		local imeta = itemstack:get_metadata()
 		if imeta == "" then
-			minetest.chat_send_player(user:get_player_name(), "Use shift+right-click to copy a gate configuration first.")
+			minetest.chat_send_player(player_name, "Use shift+right-click to copy a gate configuration first.")
 			return itemstack
 		end
 
 		local meta = minetest.get_meta(pos)
 		meta:set_string("instr", imeta)
-		plg.update_formspec(pos, imeta)
-		minetest.chat_send_player(user:get_player_name(), "Gate configuration was successfully written to FPGA!")
+		plg.update_meta(pos, imeta)
+		minetest.chat_send_player(player_name, "Gate configuration was successfully written to FPGA!")
 
 		return itemstack
 	end