update README to follow

(sorry, no UTF-8 here, Lue doesn't do multi-byte too well in this situation)
plus a bunch of symbols stuffed into the empty 128-159 range that should be
useful on a marquee:

128,129: musical notes
130-140: box drawing glyphs
141-144: block shades
145-152: arrows
153-156: explosion/splat
157-159: smileys

This commit changes the "all on" keyword to point to char(144), and
"cursor" is moved to char(31).

README.md

@@ -8,7 +8,7 @@ Simply place a panel, right-click it, and set a channel.
 
 Then send a character, a string, or one of several control words to that channel from a Mesecons Lua Controller and the mod will try to display it.  The panels use the standard 7-bit ASCII character set (with a few alterations).
 
-A single character will be displayed on the connected panel.
+A single character will be displayed on the connected panel.  A numeric message (i.e. not a string) will display the first digit on the connected panel.
 
 Strings will be displayed using all panels in a lineup, so long as they all face the same way, starting from the panel the Lua Controller is connected to, going left to right.  The other panels in the line do not need to be connected to anything - think of them as being connected together internally.  Only the panel at the far left need be connected to the Lua Controller.
 
@@ -20,14 +20,23 @@ You can put multiple lines of panels end to end to form independent displays, so
 
 The string is padded with spaces and then trimmed to 64 characters.
 
-Any unrecognized symbol or character outside the ASCII 32 - 129 range, whether part of a string or singularly is ignored, except as noted below.
+Any unrecognized symbol or character, whether part of a string or singularly is ignored, except as noted below.
+
+This mod uses the full ISO-8859-1 character set (see https://en.wikipedia.org/wiki/ISO/IEC_8859-1 for details), plus a bunch of symbols stuffed into the empty 128-159 range that should be useful on a marquee:
+    
+* 128,129: musical notes
+* 130-140: box drawing glyphs
+* 141-144: block shades
+* 145-152: arrows
+* 153-156: explosion/splat
+* 157-159: smileys
 
 The panels also respond to these control messages:
 
-* the words "off", "colon" and "period" translate to a blank space, ":", and ".", respectively.
+* the keywords "off", "colon" and "period" translate to a blank space, ":", and ".", respectively (they're leftover from the nixie tubes fork, but might be useful anyway)
-* "del" or character code 127 displays a square with an X in it
+* "del" is mapped to character #127, a square with an X in it.
-* "allon" or character code 128 will turn on all LEDs on the panel.
+* "allon" is mapped to character #144, the full/all-on block graphic.
-* "cursor" or character code 129 will display a short, thick line at the bottom of the panel.
+* "cursor" or character code 31 will display a short, thick, flashing line at the bottom of the panel.
 * "off_multi" turns all panels in a lineup off
 * "allon_multi" turns on all LEDs of all panels in a lineup.
 

init.lua

@@ -48,7 +48,7 @@ local padding = " "
 local allon = string.char(128)
 for i = 1, 64 do
 	padding = padding.." "
-	allon = allon..string.char(128)
+	allon = allon..string.char(144)
 end
 
 local display_string = function(pos, channel, string)
@@ -72,7 +72,7 @@ local display_string = function(pos, channel, string)
 		local setchan = meta:get_string("channel")
 		if not string.match(node.name, "led_marquee:char_") or (setchan ~= nil and setchan ~= "" and setchan ~= channel) then break end
 		local asc = string.byte(padded_string, i, i)
-		if (node.param2 % 8) == fdir and asc > 31 and asc < 130 then
+		if (node.param2 % 8) == fdir and asc > 30 and asc < 256 then
 			minetest.swap_node(pos2, { name = "led_marquee:char_"..asc, param2 = (node.param2 % 8) + (lastcolor*8)})
 			pos2.x = pos2.x + fdir_to_right[fdir+1][1]
 			pos2.z = pos2.z + fdir_to_right[fdir+1][2]
@@ -104,15 +104,15 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 			elseif msg == "del" then
 				minetest.swap_node(pos, { name = "led_marquee:char_127", param2 = (node.param2 % 8) + (lastcolor*8)})
 			elseif msg == "allon" then
-				minetest.swap_node(pos, { name = "led_marquee:char_128", param2 = (node.param2 % 8) + (lastcolor*8)})
+				minetest.swap_node(pos, { name = "led_marquee:char_144", param2 = (node.param2 % 8) + (lastcolor*8)})
 			elseif msg == "cursor" then
-				minetest.swap_node(pos, { name = "led_marquee:char_129", param2 = (node.param2 % 8) + (lastcolor*8)})
+				minetest.swap_node(pos, { name = "led_marquee:char_31", param2 = (node.param2 % 8) + (lastcolor*8)})
 			else
 				display_string(pos, channel, msg)
 			end
 		else
 			local asc = string.byte(msg)
-			if asc > 31 and asc < 130 then
+			if asc > 30 and asc < 256 then
 				minetest.swap_node(pos, { name = "led_marquee:char_"..asc, param2 = (node.param2 % 8) + (lastcolor*8)})
 			elseif asc < 31 then
 				lastcolor = asc
@@ -126,13 +126,13 @@ local on_digiline_receive_string = function(pos, node, channel, msg)
 	elseif msg and type(msg) == "number" then
 		if msg == 0 then
 			minetest.swap_node(pos, { name = "led_marquee:char_32", param2 = (node.param2 % 8) + (lastcolor*8)})
-		elseif msg > 31 and alnum_chars[msg - 31] ~= nil then
+		elseif msg > 30 then
 			minetest.swap_node(pos, { name = "led_marquee:char_"..tostring(msg), param2 = (node.param2 % 8) + (lastcolor*8)})
 		end
 	end
 end
 
-for i = 32, 129 do
+for i = 31, 255 do
 	local groups = { cracky = 2, not_in_creative_inventory = 1}
 	local light = LIGHT_MAX-2
 	local description = S("Alphanumeric LED marquee panel ("..i..")")
@@ -142,23 +142,23 @@ for i = 32, 129 do
 				"led_marquee_char_"..i..".png",
 			}
 
-	if i == 32 then
+	if i == 31 then
-		groups = {cracky = 2}
-		light = nil
-		description = S("Alphanumeric LED marquee panel")
-	end
-
-	if i == 129 then
 		tiles = {
 			{ name="led_marquee_base.png", color="white"},
 			{ name="led_marquee_leds_off.png", color="white"},
 				{
-				name = "led_marquee_char_129.png",
+				name = "led_marquee_char_31.png",
 				animation = {type = "vertical_frames", aspect_w = 32, aspect_h = 32, length = 0.75}
 				}
 		}
 	end
 
+	if i == 32 then
+		groups = {cracky = 2}
+		light = nil
+		description = S("Alphanumeric LED marquee panel")
+	end
+
 	minetest.register_node("led_marquee:char_"..i, {
 		description = description,
 		drawtype = "mesh",