reemove use_texture_alpha as the texture results are always on a black background, so we dont need to waste transparency rendering performance

* maintenance + translation support

* fix too long line warning

* improvements through code review

.github/workflows/luacheck.yml

@@ -0,0 +1,10 @@
+name: luacheck
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: Roang-zero1/factorio-mod-luacheck@master
+        with:
+          luacheckrc_url: ""

.luacheckrc

@@ -0,0 +1,11 @@
+unused_args = false
+
+read_globals = {
+    table = {fields = {"copy"}},
+    "minetest",
+    "digilines"
+}
+
+globals = {
+    "led_marquee"
+}

depends.txt

@@ -1,5 +0,0 @@
-default
-digilines
-mesecons_luacontroller
-mesecons_microcontroller?
-mesecons_lamp?

description.txt

@@ -1 +0,0 @@
-This mod provides a simple LED marquee that accepts single characters, strings, and special control words via digilines.

init.lua

@@ -2,13 +2,17 @@
 -- by Vanessa Dannenberg
 
 led_marquee = {}
+led_marquee.scheduled_messages = {}
 
-local S
-if minetest.get_modpath("intllib") then
-	S = intllib.make_gettext_pair()
-else
-	S = function(s) return s end
-end
+-- settings
+led_marquee.message_minimum_time = tonumber(minetest.settings:get("led_marquee_message_minimum_time")) or 0.5
+led_marquee.message_schedule_dtime = tonumber(minetest.settings:get("led_marquee_message_schedule_dtime")) or 0.2
+led_marquee.message_schedule_size = tonumber(minetest.settings:get("led_marquee_message_schedule_size")) or 10
+
+led_marquee.relay_timer = 0
+
+local S = minetest.get_translator(minetest.get_current_modname())
+local FS = function(...) return minetest.formspec_escape(S(...)) end
 
 local color_to_char = {
 	"0",
@@ -96,24 +100,15 @@ local char_to_color = {
 -- the following functions based on the so-named ones in Jeija's digilines mod
 
 local reset_meta = function(pos)
-	minetest.get_meta(pos):set_string("formspec", "field[channel;Channel;${channel}]")
-end
-
-local on_digiline_receive_std = function(pos, node, channel, msg)
-	local meta = minetest.get_meta(pos)
-	local setchan = meta:get_string("channel")
-	if setchan ~= channel then return end
-	local num = tonumber(msg)
-	if msg == "colon" or msg == "period" or msg == "off" or (num and (num >= 0 and num <= 9)) then
-			minetest.swap_node(pos, { name = "led_marquee:marquee_"..msg, param2 = node.param2})
-	end
+	minetest.get_meta(pos):set_string("formspec",
+			"formspec_version[4]"..
+			"size[8,4]"..
+			"button_exit[3,2.5;2,0.5;proceed;"..FS("Proceed").."]"..
+			"field[1.75,1.5;4.5,0.5;channel;"..FS("Channel")..";${channel}]"
+	)
 end
 
 -- convert Lua's idea of a UTF-8 char to ISO-8859-1
-
--- first char is non-break space, 0xA0
-local iso_chars=" ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
-
 local get_iso = function(c)
 	local hb = string.byte(c,1) or 0
 	local lb = string.byte(c,2) or 0
@@ -128,7 +123,12 @@ local make_iso = function(s)
 	local s2 = ""
 	while i <= string.len(s) do
 		if string.byte(s,i) > 159 then
-			s2 = s2..string.char(get_iso(string.sub(s, i, i+1)))
+			local ciso = get_iso(string.sub(s, i, i+1))
+			if ciso >= 0 and ciso < 256 then
+				s2 = s2..string.char(ciso)
+			else
+				s2 = s2..string.char(127)
+			end
 			i = i + 2
 		else
 			s2 = s2..string.sub(s, i, i)
@@ -143,7 +143,7 @@ end
 led_marquee.set_timer = function(pos, timeout)
 	local timer = minetest.get_node_timer(pos)
 	timer:stop()
-	if not timeout or timeout < 0.2 or timeout > 5 then return false end
+	if not timeout or timeout < led_marquee.message_minimum_time or timeout > 5 then return false end
 
 	if timeout > 0 then
 		local meta = minetest.get_meta(pos)
@@ -184,7 +184,7 @@ led_marquee.scroll_text = function(pos, elapsed, skip)
 			break
 		end
 	end
-	led_marquee.display_msg(pos, channel, "/"..colorchar..string.sub(msg, f)..string.rep(" ", skip + 1))
+	led_marquee.schedule_msg(pos, channel, "/"..colorchar..string.sub(msg, f)..string.rep(" ", skip + 1))
 
 	meta:set_int("index", f)
 	if not elapsed or elapsed < 0.2 then return false end
@@ -213,6 +213,27 @@ led_marquee.decode_color = function(msg)
 
 end
 
+minetest.register_globalstep(function(dtime)
+	if dtime <= led_marquee.message_schedule_dtime
+	  and (#led_marquee.scheduled_messages) > 0 then
+		led_marquee.display_msg(
+			led_marquee.scheduled_messages[1].pos,
+			led_marquee.scheduled_messages[1].channel,
+			led_marquee.scheduled_messages[1].msg
+		)
+	end
+	table.remove(led_marquee.scheduled_messages, 1)
+end)
+
+led_marquee.schedule_msg = function(pos, channel, msg)
+	local idx = #led_marquee.scheduled_messages
+	led_marquee.scheduled_messages[idx+1] = { pos=pos, channel=channel, msg=msg }
+
+	if idx >= led_marquee.message_schedule_size then
+		table.remove(led_marquee.scheduled_messages, 1)
+	end
+end
+
 led_marquee.display_msg = function(pos, channel, msg)
 	msg = string.sub(msg, 1, 6144).." "
 	if string.sub(msg,1,1) == string.char(255) then -- treat it as incoming UTF-8
@@ -312,13 +333,13 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 				led_marquee.set_timer(pos, 0)
 				msg = string.rep(" ", 2048)
 				meta:set_string("last_msg", msg)
-				led_marquee.display_msg(pos, channel, msg)
+				led_marquee.schedule_msg(pos, channel, msg)
 				meta:set_int("index", 1)
 			elseif msg == "allon" then
 				led_marquee.set_timer(pos, 0)
 				msg = string.rep(string.char(144), 2048)
 				meta:set_string("last_msg", msg)
-				led_marquee.display_msg(pos, channel, msg)
+				led_marquee.schedule_msg(pos, channel, msg)
 				meta:set_int("index", 1)
 			elseif msg == "start_scroll" then
 				local timeout = meta:get_int("timeout")
@@ -327,30 +348,31 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 				led_marquee.set_timer(pos, 0)
 				return
 			elseif string.sub(msg, 1, 12) == "scroll_speed" then
-				local timeout = tonumber(string.sub(msg, 13))
-				led_marquee.set_timer(pos, timeout)
+				local timeout = tonumber(string.sub(msg, 13)) or 0
+				led_marquee.set_timer(pos, math.max(timeout, led_marquee.message_minimum_time))
 			elseif string.sub(msg, 1, 11) == "scroll_step" then
 				local skip = tonumber(string.sub(msg, 12))
 				led_marquee.scroll_text(pos, nil, skip)
 			elseif msg == "get" then -- get the master panel's displayed char as ASCII numerical value
-				digilines.receptor_send(pos, digiline.rules.default, channel, tonumber(string.match(minetest.get_node(pos).name,"led_marquee:char_(.+)"))) -- wonderfully horrible string manipulaiton
+				digilines.receptor_send(pos, digilines.rules.default, channel,
+					tonumber(string.match(minetest.get_node(pos).name,"led_marquee:char_(.+)")))
 			elseif msg == "getstr" then -- get the last stored message
-				digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_string("last_msg"))
+				digilines.receptor_send(pos, digilines.rules.default, channel, meta:get_string("last_msg"))
 			elseif msg == "getindex" then -- get the scroll index
-				digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_int("index"))
+				digilines.receptor_send(pos, digilines.rules.default, channel, meta:get_int("index"))
 			else
 				msg = string.gsub(msg, "//", string.char(30))
 				led_marquee.set_timer(pos, 0)
 				local last_msg = meta:get_string("last_msg")
 				meta:set_string("last_msg", msg)
-				led_marquee.display_msg(pos, channel, msg)
+				led_marquee.schedule_msg(pos, channel, msg)
 				if last_msg ~= msg then
 					meta:set_int("index", 1)
 				end
 			end
 		else
 			local asc = string.byte(msg)
-			if asc > 29 and asc < 256 then
+			if asc > 30 and asc < 256 then
 				minetest.swap_node(pos, { name = "led_marquee:char_"..asc, param2 = fdir + (last_color*8)})
 				meta:set_string("last_msg", tostring(msg))
 				meta:set_int("index", 1)
@@ -358,7 +380,7 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 		end
 	elseif msg and type(msg) == "number" then
 		meta:set_string("last_msg", tostring(msg))
-		led_marquee.display_msg(pos, channel, tostring(msg))
+		led_marquee.schedule_msg(pos, channel, tostring(msg))
 		meta:set_int("index", 1)
 	end
 end
@@ -367,8 +389,8 @@ end
 
 for i = 31, 255 do
 	local groups = { cracky = 2, not_in_creative_inventory = 1}
-	local light = LIGHT_MAX-2
-	local description = S("LED marquee panel ("..i..")")
+	local light = minetest.LIGHT_MAX-2
+	local description = S("LED marquee panel (@1)", i)
 	local leds = "led_marquee_char_"..i..".png^[mask:led_marquee_leds_on.png"
 
 	if i == 31 then
@@ -397,9 +419,9 @@ for i = 31, 255 do
 		},
 		overlay_tiles = { "", leds },
 		inventory_image = wimage,
+		is_ground_content = false,
 		wield_image = wimage,
 		palette="led_marquee_palette.png",
-		use_texture_alpha = true,
 		groups = groups,
 		paramtype = "light",
 		paramtype2 = "colorwallmounted",

locale/led_marquee.de.tr

@@ -0,0 +1,5 @@
+# textdomain: led_marquee
+LED marquee panel (@1)=LED-Anzeigetafel (@1)
+LED marquee panel=LED-Anzeigetafel
+Proceed=Fortsetzen
+Channel=Kanal

locale/template.txt

@@ -0,0 +1,5 @@
+# textdomain: led_marquee
+LED marquee panel (@1)=
+LED marquee panel=
+Proceed=
+Channel=

mod.conf

@@ -1 +1,6 @@
 name = led_marquee
+title = LED marquee
+description = This mod provides a simple LED marquee that accepts single characters, strings, and special control words via digilines.
+depends = default, digilines
+optional_depends = mesecons_luacontroller, mesecons_microcontroller, mesecons_lamp
+min_minetest_version = 5.2.0

settingtypes.txt

@@ -0,0 +1,8 @@
+# Minimal marquee interval
+led_marquee_message_minimum_time (Minimal marquee interval) float 0.5
+
+# Marquee globalstep update interval
+led_marquee_message_schedule_dtime (Marquee globalstep update interval) float 0.2
+
+# Global message queue size
+led_marquee_message_schedule_size (Global message queue size) int 10