Don't allow engine to add the implicit "Proceed" button

(this change makes it possible to theme the formspec)

LICENSE

@@ -1,15 +1,12 @@
-(This file copied from Digilines mod)
+License for code: LGPL 3.0
+License for media and all other assets:  CC-by-SA 4.0
 
-The LGPLv3 applies to all code in this project.
+###############################################################################
-The WTFPL applies to textures and any other content in this project which is
-not source code.
 
-=============================================================
+                   GNU LESSER GENERAL PUBLIC LICENSE
-
-GNU LESSER GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -172,20 +169,432 @@ apply, that proxy's public statement of acceptance of any version is
 permanent authorization for you to choose that version for the
 Library.
 
+###############################################################################
 
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init.lua

@@ -2,6 +2,13 @@
 -- by Vanessa Dannenberg
 
 led_marquee = {}
+led_marquee.scheduled_messages = {}
+
+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
 if minetest.get_modpath("intllib") then
@@ -96,7 +103,12 @@ 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;${channel}]")
+	minetest.get_meta(pos):set_string("formspec",
+			"formspec_version[4]"..
+			"size[8,4]"..
+			"button_exit[3,2.5;2,0.5;proceed;Proceed]"..
+			"field[1.75,1.5;4.5,0.5;channel;Channel;${channel}]"
+	)
 end
 
 local on_digiline_receive_std = function(pos, node, channel, msg)
@@ -128,7 +140,12 @@ 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 +160,7 @@ 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 +201,7 @@ 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 +230,27 @@ 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 +350,13 @@ 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")
@@ -327,8 +365,8 @@ 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))
+				local timeout = tonumber(string.sub(msg, 13)) or 0
-				led_marquee.set_timer(pos, timeout)
+				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)
@@ -341,9 +379,12 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 			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)
-				meta:set_int("index", 1)
+				if last_msg ~= msg then
+					meta:set_int("index", 1)
+				end
 			end
 		else
 			local asc = string.byte(msg)
@@ -355,7 +396,7 @@ 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
@@ -366,23 +407,17 @@ 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 tiles = {
+	local leds = "led_marquee_char_"..i..".png^[mask:led_marquee_leds_on.png"
-				{ name="led_marquee_base.png", color="white"},
-				{ name="led_marquee_leds_off.png", color="white"},
-				"led_marquee_char_"..i..".png",
-			}
 
 	if i == 31 then
-		tiles = {
+		leds ={
-			{ name="led_marquee_base.png", color="white"},
+			name = "led_marquee_char_31.png^[mask:led_marquee_leds_on_cursor.png",
-			{ name="led_marquee_leds_off.png", color="white"},
+			animation = {type = "vertical_frames", aspect_w = 32, aspect_h = 32, length = 0.75}
-				{
-				name = "led_marquee_char_31.png",
-				animation = {type = "vertical_frames", aspect_w = 32, aspect_h = 32, length = 0.75}
-				}
 		}
 	end
 
+	local wimage
+
 	if i == 32 then
 		groups = {cracky = 2}
 		light = nil
@@ -394,7 +429,11 @@ for i = 31, 255 do
 		description = description,
 		drawtype = "mesh",
 		mesh = "led_marquee.obj",
-		tiles = tiles,
+		tiles = {
+			{ name = "led_marquee_base.png", color = "white" },
+			{ name = "led_marquee_leds_off.png", color = "white" }
+		},
+		overlay_tiles = { "", leds },
 		inventory_image = wimage,
 		wield_image = wimage,
 		palette="led_marquee_palette.png",
@@ -409,6 +448,11 @@ for i = 31, 255 do
 			reset_meta(pos)
 		end,
 		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
 			if (fields.channel) then
 				minetest.get_meta(pos):set_string("channel", fields.channel)
 			end

mod.conf

@@ -1 +1,2 @@
 name = led_marquee
+min_minetest_version = 5.2.0

models/led_marquee.obj

@@ -21,10 +21,6 @@ v -0.500000 -0.453125 0.468750
 v -0.500000 -0.453125 -0.468750
 v -0.500000 -0.437500 -0.484375
 v -0.500000 -0.437500 -0.500000
-v 0.500000 -0.449125 -0.468750
-v -0.500000 -0.449125 -0.468750
-v -0.500000 -0.449125 0.468750
-v 0.500000 -0.449125 0.468750
 vt 0.681855 0.961799
 vt 0.723891 0.992824
 vt 0.723891 0.000000
@@ -69,10 +65,6 @@ vt 0.000000 0.000000
 vt 1.000000 0.000000
 vt 1.000000 1.000000
 vt 0.000000 1.000000
-vt 0.000000 0.000000
-vt 1.000000 0.000000
-vt 1.000000 1.000000
-vt 0.000000 1.000000
 vn 1.0000 0.0000 0.0000
 vn 0.0000 -1.0000 -0.0000
 vn -1.0000 0.0000 0.0000
@@ -106,7 +98,5 @@ f 7/26/8 6/38/8 19/19/8
 f 19/19/6 6/38/6 5/20/6
 f 15/22/6 10/39/6 9/23/6
 f 8/25/7 17/40/7 16/24/7
-g Cube_Cube_LEDs_Cube_Cube_LEDs_leds_off
+g Cube_Cube_LEDs_Cube_Cube_LEDs_base_led_marquee_leds_off.png
 f 1/41/6 2/42/6 3/43/6 4/44/6
-g Cube_Cube_LEDs_Cube_Cube_LEDs_leds_on
-f 21/45/6 22/46/6 23/47/6 24/48/6