From f5128886f8c25f7403ca419e52436afd23c0bb8d Mon Sep 17 00:00:00 2001
From: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>
Date: Tue, 16 Jun 2020 19:46:06 +0200
Subject: [PATCH] working pattern example

---
 digiline.lua                | 12 ++++++------
 examples/simple_pattern.lua | 20 +++++++++++---------
 2 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/digiline.lua b/digiline.lua
index 96eb294..b920e92 100644
--- a/digiline.lua
+++ b/digiline.lua
@@ -123,7 +123,7 @@ function digibuilder.digiline_effector(pos, _, channel, msg)
 			digilines.receptor_send(pos, digibuilder.digiline_rules, set_channel, {
 				pos = msg.pos,
 				error = true,
-				message = "place node is unknown: '" .. msg.name .. "'"
+				message = "place node is unknown: '" .. (msg.name or "<empty>") .. "'"
 			})
 			return
 		end
@@ -156,12 +156,12 @@ function digibuilder.digiline_effector(pos, _, channel, msg)
 		end
 
 		-- place node inworld
-		minetest.place_node(absolute_pos, place_node)
+		minetest.log("action", "[digibuilder] " .. owner .. " places node '" ..
+			place_node.name .. "' at " ..
+			minetest.pos_to_string(absolute_pos)
+		)
 
-		if enable_param2 then
-			-- add param2 info
-			minetest.swap_node(absolute_pos, place_node)
-		end
+		minetest.set_node(absolute_pos, place_node)
 
 		digilines.receptor_send(pos, digibuilder.digiline_rules, set_channel, {
 			pos = msg.pos,
diff --git a/examples/simple_pattern.lua b/examples/simple_pattern.lua
index 6c78a7e..cc8e155 100644
--- a/examples/simple_pattern.lua
+++ b/examples/simple_pattern.lua
@@ -2,7 +2,7 @@
 -- pattern, starting at -x/-z
 local data = {
 	-- x >>
-	"sdsd",
+	"sdsdsd",
 	"dsds"
 	-- z \/
 }
@@ -13,9 +13,9 @@ local nodes = {
 }
 
 -- coordinate offsets
-local x_offset = -10
-local y_offset = 1
-local z_offset = -10
+local x_offset = -5
+local y_offset = 2
+local z_offset = -5
 
 -- initial start
 if event.type == "program" then
@@ -26,13 +26,13 @@ end
 
 -- timer interrupt
 if event.type == "interrupt" then
-	local line = data[mem.line]
-	if not line then
+ local line = data[mem.line]
+ if not line then
 		-- done
 		return
 	end
 
-	local char = line:sub(mem.pos, 1)
+	local char = line:sub(mem.pos, mem.pos)
 	if char == "" then
 		-- next line
 		mem.line = mem.line + 1
@@ -46,16 +46,18 @@ if event.type == "interrupt" then
 	  pos = { x=x_offset+mem.pos-1, y=y_offset, z=z_offset+mem.line-1 },
 	  name = nodes[char]
 	})
+
 end
 
 -- callback from digibuilder node
 if event.type == "digiline" and event.channel == "digibuilder" then
-	if event.error then
+ if event.error then
 		-- error state
 		error(event.message)
+		return
 	end
 
 	-- next command
-	mem.line = mem.line + 1
+  mem.pos = mem.pos + 1
 	interrupt(1)
 end