From ee6e27219e8aa9d4d8981ab0a952e3b0595f3948 Mon Sep 17 00:00:00 2001
From: cheapie <no-email-for-you@example.com>
Date: Mon, 7 Dec 2015 13:40:15 -0600
Subject: Add group addressing

---
 README   | 19 +++++++++++++++++++
 init.lua | 22 ++++++++++++++++++----
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/README b/README
index 53c13a0..34c03d3 100644
--- a/README
+++ b/README
@@ -35,3 +35,22 @@ off, black, blue, brown, cyan, darkblue, darkcyan, darkgray, darkgreen, darkmage
 Adding more colors:
 
 Provide a texture named "rgblightstone_color.png" (where "color" is the color you want to add) and call rgblightstone.add(color)
+
+Group addressing mode:
+
+If you are building something with large numbers of these things, set them all to the same channel, set X and Y addresses on each, and send nested tables (Y on the outside) with colors for all of them.
+For example, given this display:
+
+X=1 Y=1     X=2 Y=1
+
+X=1 Y=2     X=2 Y=2
+
+to make it show:
+
+red     green
+blue    yellow
+
+send this:
+
+{{"red","green"},
+{"blue","yellow"}}
diff --git a/init.lua b/init.lua
index 0e140d7..69a560f 100644
--- a/init.lua
+++ b/init.lua
@@ -9,10 +9,12 @@ function rgblightstone.add(name)
 		sounds = default.node_sound_stone_defaults(),
 		on_construct = function(pos)
 			local meta = minetest.get_meta(pos)
-			meta:set_string("formspec", "field[channel;Channel;${channel}]")
+			meta:set_string("formspec", "size[8,4;]field[1,1;6,2;channel;Channel;${channel}]field[1,2;2,2;addrx;X Address;${addrx}]field[5,2;2,2;addry;Y Address;${addry}]button_exit[2.25,3;3,1;submit;Save]label[3,2;Leave address blank\nfor individual mode]")
 		end,
 		on_receive_fields = function(pos, formname, fields, sender)
 			if fields.channel then minetest.get_meta(pos):set_string("channel", fields.channel) end
+			if fields.addrx then minetest.get_meta(pos):set_string("addrx",fields.addrx) end
+			if fields.addry then minetest.get_meta(pos):set_string("addry",fields.addry) end
 		end,
 		light_source = name~= "off" and default.LIGHT_MAX-2 or 0,
 		digiline = {
@@ -20,9 +22,21 @@ function rgblightstone.add(name)
 			effector = {
 				action = function(pos, node, channel, msg)
 					local channel_set = minetest.get_meta(pos):get_string("channel")
-					if channel==channel_set then
-						for _,color in ipairs(rgblightstone.colors) do
-							if msg==color then minetest.swap_node(pos, {name = "rgblightstone:lightstone_"..color}) end
+					local xaddr = minetest.get_meta(pos):get_string("addrx")
+					local yaddr = minetest.get_meta(pos):get_string("addry")
+					if channel==channel_set and msg ~= nil then
+						if xaddr ~= nil and xaddr ~= "" and yaddr ~= nil and yaddr ~= "" then
+							for _,color in ipairs(rgblightstone.colors) do
+								if msg[tonumber(yaddr)] ~= nil and msg[tonumber(yaddr)][tonumber(xaddr)] ~= nil and msg[tonumber(yaddr)][tonumber(xaddr)] == color and msg[tonumber(yaddr)][tonumber(xaddr)] ~= minetest.get_node(pos).color then
+									minetest.swap_node(pos, {name = "rgblightstone:lightstone_"..color})
+								end
+							end
+						else
+							for _,color in ipairs(rgblightstone.colors) do
+								if msg == color and msg ~= minetest.get_node(pos).color then
+									minetest.swap_node(pos, {name = "rgblightstone:lightstone_"..color})
+								end
+							end
 						end
 					end
 				end
-- 
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