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 -- Advanced Tunnel by Henness
 -- Version 1.3.4 1/4/2013
 
 -- Config
 Version = "v1.3.4"
 HeightQuestion = false
 height = 2
 WidthQuestion = false
 width = 2
-lenghth = 15
+length = 15
 LengthQuestion = false
 TorchesQuestion = false
 torches = false
 
 -- Functions
 function version() -- Version function
 	return Version
 end
 
 function clearscreen() -- Clearscreen function
 	term.clear()
 	regwrite( "Advanced Tunnel", 12, 1 )
 	regwrite( version(), 2, 12 )
 	regwrite( "Designed by Henness", 17, 12 )
 	term.setCursorPos( 1, 3 )
 end
 
 function regwrite(string, columnVar, rowVar) -- Write a string to the cords
 	term.setCursorPos( columnVar, rowVar )
 	write (string)
 end
 
 function arcwrite(number, columnVar, rowVar) -- Write a number "right to left" to the cords
 	digits = math.ceil(math.log10(number))
 	if 10^digits == number then
 		digits = digits + 1
 	end
 	term.setCursorPos( columnVar, rowVar )
 	while digits > 1 do
 		digits = digits - 1
 		columnVar = columnVar - 1
 		term.setCursorPos( columnVar, rowVar )
 	end
 	write (number)
 end
 
 function createtable() -- Make a table function
 clearscreen()
 print ( [[
  +--------------------------------+
  |Blocks Mined:                 0 |
  |Torches Placed:               0 |
  +--------------------------------+
  |             Status             |
  |[                              ]|
  |                0%              |
  +--------------------------------+
 ]] )
 placedValue = 0
 minedValue = 0
 end
 
 function updatetable() -- Update the table
 	-- Update Blocks Mined
 	minedValue = minedValue + 1
 	arcwrite(minedValue, 33, 4)
 
 	-- Update Percentage
 	if length > 0 then
 		area = (height * width * length)
 	else
 		area = minedValue
 	end
 	percentage = math.ceil((minedValue / area) * 100)
 	arcwrite(percentage, 19, 9)
 
 	-- Update Percentage Bar
 	percentageBar = math.floor(percentage * 0.3)
 	columnVar = 4
 	while percentageBar > 0 do
 		regwrite( "=", columnVar, 8 )
 		percentageBar = percentageBar - 1
 		columnVar = columnVar + 1
 	end
 end
 
 function placetorch() -- Place a torch
 	if torches == true then
 		if lengthSpacingVar == 0 and ( spaceFromWallVar == 0 or widthSpacingVar == 0 ) then
 			turtle.placeDown()
 			if turtle.getItemCount(1) == 0 then
 				noTorches = true
 			end
 			spaceFromWallVar = -1
 			widthSpacingVar = widthSpacing
 			-- Update Torches Placed
 			placedValue = placedValue + 1
 			arcwrite(placedValue, 33, 5)
 		else
 			spaceFromWallVar = spaceFromWallVar - 1
 			widthSpacingVar = widthSpacingVar - 1
 		end
 	end
 end
 
 function widthtest() -- Test width for numbers that = 4+10n
 	widthTestVar = width
 	while widthTestVar > 4 do
 		widthTestVar = widthTestVar - 10
 	end
 	if widthTestVar == 4 then
 		return true
 	end
 end
 
 function setspacing() -- Calculate spacing of torches
 	if width < 6 then
 		if math.fmod( width, 2 ) == 0 then -- If even
 			if width == 2 then
 				lengthSpacing = 9
 				spaceFromWall = ( 1 + ( -1 )^placedValue ) / 2
 			else
 				lengthSpacing = 7
 				spaceFromWall = (( 1 + ( -1 )^placedValue ) / 2 ) + 1
 			end
 		else -- If odd
 			spaceFromWall = math.floor( width / 2 )
 			if width == 5 then
 				lengthSpacing = 6
 			elseif width == 3 then
 				lengthSpacing = 8
 			else
 				lengthSpacing = 10
 			end
 		end
 		widthSpacing = -1
 	else
 		if math.fmod( width, 2 ) == 0 then -- If even
 			widthSpacing = 4
 			lengthSpacing = 4
 			if widthtest() == true or width == 6 then
 				spaceFromWall = 0
 			else
 				spaceFromWallVar = width
 				while spaceFromWallVar > 7 do
 					spaceFromWallVar = spaceFromWallVar - ( widthSpacing + 1 )
 				end
 				spaceFromWall = ( spaceFromWallVar - 1 ) / 2
 			end
 		else -- If odd
 			widthSpacing = 5
 			lengthSpacing = 4
 			if width == 7 then
 				spaceFromWall = 0
 			else
 				spaceFromWallVar = width
 				while spaceFromWallVar > 7 do
 					spaceFromWallVar = spaceFromWallVar - ( widthSpacing + 1 )
 				end
 				spaceFromWall = ( spaceFromWallVar - 1 ) / 2
 			end
 		end
 	end
 	spaceFromWallVar = spaceFromWall
 	widthSpacingVar = widthSpacing
 	lengthSpacingVar = lengthSpacing
 end
 
 function digdown() -- Dig down and update the table
 	if turtle.detectDown() then
 		turtle.digDown()
 	end
 	updatetable()
 end
 
 function digup() -- Dig up and update the table
 	while turtle.detectUp() do
 		turtle.digUp()
 		sleep(0.5)
 	end
 	updatetable()
 end
 
 function digforward() -- Dig forward and update the table
 	local moved = moveforward()
 	if not moved and turtle.detect() then
 		repeat turtle.dig() until moveforward()
 		local moved = true
 	elseif not moved and not turtle.detect() then
 		repeat turtle.attack() until moveforward()
 	end
 	updatetable()
 end
 
 function moveforward() -- Move forward
 	return turtle.forward()
 end
 
 function largetunnel() -- Mine a tunnel larger then one wide
 	widthvar = width - 1
 	while widthvar > 0 do
  		if tunnelheight == 1 then
 			digdown()
 			placetorch()
 			moveforward()
 		end
 		if tunnelheight == 2 then
 			digdown()
 			placetorch()
 			digforward()
 		end
  		if tunnelheight == 3 then
 			digup()
 			digdown()
 			placetorch()
 			digforward()
 		end
 		if tunnelheight > 3 then
 			digup()
 			digdown()
 			digforward()
 		end
 		widthvar = widthvar - 1
 	end
 	if tunnelheight == 1 then
 		digdown()
 		tunnelheight = tunnelheight - 1
 	elseif tunnelheight == 2 then
 		digdown()
 		tunnelheight = tunnelheight - 2
 	elseif tunnelheight == 3 then
 		digup()
 		digdown()
 		tunnelheight = tunnelheight - 3
 	else
 		digup()
 		digdown()
 		tunnelheight = tunnelheight - 3
 		if tunnelheight == 1 then
 			turtle.down()
 		end
 		if tunnelheight == 2 then
 			turtle.down()
 			digdown()
 			turtle.down()
 		end
 		if tunnelheight >= 3 then
 			turtle.down()
 			digdown()
 			turtle.down()
 			digdown()
 			turtle.down()
 		end
 	end
 end
 
 function smalltunnel() -- Mine a one wide tunnel
 	if tunnelheight == 2 then
 		digdown()
 	end
 	if tunnelheight == 3 then
 		digup()
 		digdown()
 	end
 	if tunnelheight > 3 then
 		digup()
 		digdown()
 		turtle.down()
 		tunnelheight = tunnelheight - 3
 		while tunnelheight > 1 do
 			digdown()
 			turtle.down()
 			tunnelheight = tunnelheight - 1
 		end
 		digdown()
 	end
 	placetorch()
 end
 
 -- Questions
 clearscreen()
 while HeightQuestion == true do -- Height Question
 	print("Height of tunnel?")
 	height = tonumber(read())
 	clearscreen()
 	if height == nil then
 		print( "Please answer with a number." )
 	elseif height >= 2 then
 		HeightQuestion = false
 		startheight = height - 3
 	elseif height == 1 then
 		print( "The tunnel height must be larger than one." )
 	elseif height == 0 then
 		print( "The tunnel height can't be infinite." )
 	else
 		print( "The tunnel height must be positive." )
 	end
 end
 
 clearscreen()
 while WidthQuestion == true do -- Width Question
 	print("Width of tunnel?")
 	width = tonumber(read())
 	clearscreen()
 	if width == nil then
 		print( "Please answer with a number." )
 	elseif width > 0 then
 		WidthQuestion = false
 	elseif width == 0 then
 		print( "The tunnel width can't be infinite." )
 	else
 		print( "The tunnel width must be positive." )
 	end
 end
 
 clearscreen()
 while LengthQuestion == true do -- Length Question
 	print("Length of tunnel?")
 	length = tonumber(read())
 	clearscreen()
 	if length == nil then
 		print( "Please answer with a number." )
 	elseif length > 0 then
 		LengthQuestion = false
 		lengthVar = 0
 	elseif length == 0 then
 		LengthQuestion = false
 		Infinitelength = true
 		TorchesQuestion = false
 		TorchSpacingQuestion = false
 		lengthVar = (-1)
 	else
 		print( "The tunnel length must be positive." )
 	end
 end
 
 clearscreen()
 while TorchesQuestion == true do -- Torch Question
 	print("Place torches?")
 	light = string.lower(read())
 	clearscreen()
 	if light == ( 'yes' ) then
 		if turtle.getItemCount(1) == 0 then
 			print("Please place torches in the first inventory slot.")
 		else
 		torches = true
 		TorchesQuestion = false
 		noTorches = false
 		setspacing()
 		lengthSpacingVar = 0
 		end
 	elseif light == ( 'no' ) then
 		torches = false
 		TorchesQuestion = false
 	else
 		print("Please answer yes or no.")
 	end
 end
 
 -- Create the gui
 createtable()
 
 -- Mining Loop
 turtle.up()
 while startheight > 0 do
 	local moved = turtle.up()
 	if not moved and turtle.detectUp() then
 		repeat turtle.digUp() until turtle.up()
 		local moved = true
 	elseif not moved and not turtle.detectUp() then
 		repeat turtle.attackUp() until turtle.up()
 	end
 	startheight = startheight - 1
 end
 while lengthVar < length do
 	lengthVar = lengthVar + 1
 	digforward()
 	if width > 1 then
 		turtle.turnRight()
 	end
 
 	-- Mine a one wide tunnel or a larger tunnel.
 	tunnelheight = height
 	if width > 1 then
 		while tunnelheight > 0 do
 			largetunnel()
 			turtle.turnRight()
 			turtle.turnRight()
 			if tunnelheight > 0 then
 				largetunnel()
 				if tunnelheight > 0 then
 					turtle.turnRight()
 					turtle.turnRight()
 				end
 			else
 				widthvar = width - 1
 				while widthvar > 0 do
 					moveforward()
 					widthvar = widthvar - 1
 				end
 			end
 		end
 	else
 		smalltunnel()
 	end
 	if torches == true then
 		if lengthSpacingVar == 0 then
 			spaceFromWallVar = spaceFromWall
 			widthSpacingVar = widthSpacing
 			lengthSpacingVar = lengthSpacing
 		else
 			spaceFromWallVar = spaceFromWall
 			widthSpacingVar = widthSpacing
 			lengthSpacingVar = lengthSpacingVar - 1
 		end
 	end
 	startheight = height - 3
 	while startheight > 0 do
 		turtle.up()
 		startheight = startheight - 1
 	end
 
 	-- Infinite Length
 	if Infinitelength == true then
 		lengthVar = lengthVar - 1
 	end
 
 	-- Stop or Continue
 	if lengthVar == length or noTorches == true then
 		if width > 1 then
 			turtle.turnLeft()
 		else
 			turtle.turnRight()
 			turtle.turnRight()
 		end
 		while lengthVar > 0 do
 			moveforward()
 			lengthVar = lengthVar - 1
 		end
 		while startheight < ( height - 3 ) do
 			turtle.down()
 			startheight = startheight + 1
 		end
 		turtle.turnLeft()
 		turtle.turnLeft()
 		lengthVar = length
 		term.setCursorPos( 1, 11 )
 		if noTorches == true then
 			print ("Out of Torches!")
 		else
 			print ("Tunnel Complete!")
 		end
 		term.setCursorPos( 1, 2 )
 	else
 		if width > 1 then
 			turtle.turnRight()
 		end
 	end
 end