View difference between Paste ID: eCKxztiV and 0hUKaXKe

 --Announcement: In an attempt to add a tunnel boring feature to this, I ended up breaking it so auto refueling no longer works. Version 2.0 is in the works (K6HvcJmD) but many features do not function and I'm taking a break from fixing it, but feel free to edit it if you'd like.
 
 --Note: Computer craft has an issue where turtles will break if left in unloaded chunks, keep near the turtle or use a worldspike.
 
 --This is version 1.2.4, updates will replace the current pastebin with the newer version once they're done!
 --Added a boring mode that mines a single layer, good for underground strip mining.
 
 --How to use:
 --Place a chest to the left of the turtle for fuel and a chest behind it for a place to drop off items.
 --"Quarry or bore?" Type "quarry" for a quarry or "bore" to mine a single layer. Make sure you type in all lowercase.
 --"Rows" If looking from above, this is how many blocks it will mine in the 'y' axis.
 --"Columns" If looking from above, this is how many blocks it will mine in the 'x' axis.
 --"Current 'y' level?" The 'y' level of the turtle.
 --"Toss garbage blocks?" Type "yes" to toss out stone, gravel, dirt, etc. Make sure you type in all lowercase.
 
 term.clear()
 term.setCursorPos(1,1)
 io.write("Quarry or bore? ")
 quarrybore = io.read()
 term.clear()
 term.setCursorPos(1,1)
 io.write("Rows: ")
 rows = io.read()
 io.write("Columns: ")
 columns = io.read()
 iniY = 2
 if quarrybore == "quarry" then
 	term.clear()
 	term.setCursorPos(1,1)
 	io.write("Current 'y' level: ")
 	iniY = io.read()
 end
 term.clear()
 term.setCursorPos(1,1)
 io.write("Toss garbage blocks? ")
 tossGarbage = io.read()
 term.clear()
 term.setCursorPos(1,1)
 
 posX = 0
 posY = 0
 posZ = 0
 
 rotation = 0
 
 fullSlots = 0
 
 function info()
 	term.clear()
 	term.setCursorPos(1,1)
 	print("---------------------------------------")
 	print("Mining size: " .. rows .. " by " .. columns)
 --	print("Total distance: " .. posX + posY + posZ)
 --	print("X: " .. posX)
 --	print("Y: " .. posY)
 --	print("Z: " .. posZ)
 --	print("Orientation: " .. rotation)
 	if tossGarbage == "yes" then
 		print("Toss garbage: Yes")
 	else
 		print("Toss garbage: No")
 	end
 	print("")
 	print("Fuel level: " .. turtle.getFuelLevel())
 end
 
 function rotate()
 	if rotation == 0 then
 		turtle.turnLeft()
 	elseif rotation == 1 then
 		turtle.turnLeft()
 		turtle.turnLeft()
 	elseif rotation == 2 then
 		turtle.turnRight()
 	end
 end
 
 function recover()
 	rotate()
 	local step = 0
 	for step = posY - 1, 0, -1 do
 		turtle.up()
 	end
 	for step = posX - 1, 0, -1 do
 		turtle.forward()
 	end
 	turtle.turnLeft()
 	for step = posZ - 1, 0, -1 do
 		turtle.forward()
 	end
 end
 
 function resume()
 	turtle.turnLeft()
 	turtle.turnLeft()
 	local step = 0
 	for step = 0, posZ - 1, 1 do
 		turtle.forward()
 	end
 	turtle.turnRight()
 	for step = 0, posX - 1, 1 do
 		turtle.forward()
 	end
 	for step = 0, posY - 1, 1 do
 		turtle.down()
 	end
 	if rotation == 0 then
 		turtle.turnLeft()
 	elseif rotation == 2 then
 		turtle.turnRight()
 	elseif rotation == 3 then
 		turtle.turnRight()
 		turtle.turnRight()
 	end
 end
 
 function checkFuel()
 	turtle.select(1)
 	turtle.refuel()
 	if turtle.getFuelLevel() <= posX + posY + posZ + 1 then
 		refill = 1
 		empty()
 		refill = 0
 	end
 end
 
 function empty()
 	recover()
 	if quarrybore == "bore" then
 		turtle.down()
 	end
 	local search = 0
 	for search = 16, 1, -1 do
 		turtle.select(search)
 		turtle.drop()
 	end
 	if refill == 1 then
 		turtle.turnRight()
 		while turtle.getFuelLevel() <= posX + posY + posZ + 1 do
 			if turtle.suck() == true then
 				turtle.suck()
 				turtle.select(1)
 				turtle.refuel()
 			elseif turtle.suck() == false then
 				turtle.select(1)
 				turtle.refuel()
 				term.clear()
 				term.setCursorPos(1,1)
 				io.write("Please add more fuel to slot '1' or fuel chest.")
 			end
 		end
 		turtle.turnLeft()
 		resume()
 	end
 	if done ~= 1 then
 		if quarrybore == "bore" then
 			turtle.up()
 		end
 		resume()
 	end
 end
 
 function checkFull()
 	fullSlots = 0
 	local search = 0
 	for search = 16, 1, -1 do
 		turtle.select(search)
 		if turtle.getItemCount() > 0 then
 			if tossGarbage == "yes" then
 				if turtle.getItemDetail().name == "minecraft:cobblestone" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "minecraft:stone" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "minecraft:dirt" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "minecraft:gravel" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "chisel:marble2" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "chisel:limestone2" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "minecraft:netherrack" then
 					turtle.drop()
 				elseif turtle.getItemDetail().name == "natura:nether_tainted_soil" then
 					turtle.drop()
 				end
 			end
 		end
 		if turtle.getItemCount() > 0 then
 			fullSlots = fullSlots + 1
 		end
 	end
 	if fullSlots == 16 then
 		empty()
 	end
 end
 
 function nextRow()
 	if turn == 0 then
 		turtle.turnRight()
 		rotation = 1
 		digStraight()
 		turtle.turnRight()
 		rotation = 2
 		turn = 1
 	elseif turn == 1 then
 		turtle.turnLeft()
 		rotation = 1
 		digStraight()
 		turtle.turnLeft()
 		rotation = 0
 		turn = 0
 	elseif turn == 2 then
 		turtle.turnRight()
 		rotation = 3
 		digStraight()
 		turtle.turnRight()
 		rotation = 0
 		turn = 3
 	elseif turn == 3 then
 		turtle.turnLeft()
 		rotation = 3
 		digStraight()
 		turtle.turnLeft()
 		rotation = 2
 		turn = 2
 	end
 end
 
 function digDown()
 	checkFuel()
 	local step = 0
 	for step = 2, 0, -1 do
 		turtle.digDown()
 		if turtle.down() == true then
 			posY = posY + 1
 		end
 		info()
 	end
 end
 
 function digStraight()
 	checkFuel()
 	turtle.digDown()
 	turtle.dig()
 	turtle.dig()
 	turtle.forward()
 	if rotation == 0 then
 		posZ = posZ + 1
 	elseif rotation == 1 then
 		posX = posX + 1
 	elseif rotation == 2 then
 		posZ = posZ - 1
 	elseif rotation == 3 then
 		posX = posX - 1
 	end
 	turtle.digUp()
 	info()
 end
 
 function quarry()
 	turn = 0
 	done = 0
 	iniY = tonumber (iniY)
 	checkFuel()
 	turtle.digUp()
 	turtle.up()
 	posY = posY - 1
 	while posY < iniY - 2 do
 		if quarrybore == "quarry" then
 			digDown()
 		end
 		for c = columns, 1, -1 do
 			for r = rows, 2, -1 do
 				digStraight()
 			end
 			checkFull()
 			if c == 1 then
 				turtle.turnRight()
 				turtle.turnRight()
 				if rotation == 0 then
 					rotation = 2
 				elseif rotation == 2 then
 					rotation = 0
 				end
 				if turn == 0 then
 					turn = 2
 				elseif turn == 1 then
 					turn = 3
 				elseif turn == 2 then
 					turn = 0
 				elseif turn == 3 then
 					turn = 1
 				end
 			elseif c > 1 then
 				nextRow()
 			end
 		end
 		if quarrybore == "bore" then
 			posY = posY + 1
 		end
 	end
 	turtle.digDown()
 	done = 1
 	empty()
 	term.clear()
 	term.setCursorPos(1,1)
 	print("Thank you for using Gambit's quarry program!")
 	print("---------------------------------------")
 end
 
 quarry()