RailPy_v0.1

local tArgs = { ... }
local dis = tonumber(tArgs[1])
local PylonCount = math.floor(dis/28)
local y = 0
local p = 0
--Slots in Turtle Inventory for Items to be placed
local cPath = 1 --cPath = SandStone
local Edge = 5 --Edge = Oak Planks
local uPath = 9 --uPath = Stone Slabs

--EnderChest slots containing items for Restocking, one item per chest
local cPathEnChest = 4 --enderchest with SandStone
local EdgeEnChest = 8 --enderchest with Oak Planks
local uPathEnChest = 12 --enderchest with Stone Slabs

--Variables used to calculate distance traveled for the little guy
local startmoves = turtle.getFuelLevel()
local endmoves = 0
local moves = 0

--====================================================
--Rail Way Building Functions
--====================================================
local  dumpCrap, getItems, CheckslotCount, goingDown, DownPlace, PlaceBlock, placeUnderPath, PlaceSlab, checkHeight, BuildPylon, goingDownSlab, DownPlaceSlab

--Clear the Turtle inventory of slots not used from above declarations
--by dumping them into the Enderchest placed in slot 16
--Slot numbers are hard coded so adjust if needed.
dumpCrap = function()
    turtle.digUp()
    turtle.select(16)
    turtle.placeUp()
    turtle.select(2)
    turtle.dropUp()
    turtle.select(3)
    turtle.dropUp()
    turtle.select(6)
    turtle.dropUp()
    turtle.select(7)
    turtle.dropUp()
    turtle.select(10)
    turtle.dropUp()
    turtle.select(11)
    turtle.dropUp()
    turtle.select(13)
    turtle.dropUp()
    turtle.select(14)
    turtle.dropUp()
    turtle.select(15)
    turtle.dropUp()
    turtle.select(16)
    turtle.digUp()
end

--Restocking Function
getItems = function(slot,chestslot)
    turtle.select(15)
    turtle.digUp()
    turtle.select(chestslot)
    turtle.placeUp()
    turtle.select(slot)
    turtle.suckUp()
    turtle.select(chestslot)
    turtle.digUp()
end

--Check how many items are left and restock if needed
CheckslotCount = function(slot,chestslot)
    if turtle.getItemCount(slot) < 1 then
        getItems(slot,chestslot)
    end
end

--Checks to see how high to build the pathway
checkHeight = function()
  if turtle.detectDown() then
    for i = 1, 10 do
      turtle.up()
      sleep(0.2)
    end
  else
    turtle.down()
    sleep(0.2)
    checkHeight()
  end
end

--==========================================================================
--Pylon Building Functions
--==========================================================================

--Travels down to see how much room there is to place blocks ( Sets variable y )
goingDown = function(slot,chestslot)
    turtle.down()
    y = y + 1
    DownPlace(slot,chestslot)
end

goingDownSlab = function(slot,chestslot)
    turtle.down()
    y = y + 1
    DownPlaceSlab(slot,chestslot)
end

--Places blocks in a 1x1 column to a height "y" that was set by the function goingDown()
PlaceBlock = function(slot,chestslot)
    for i = 1, y do
        CheckslotCount(slot,chestslot)
        turtle.select(slot)
        turtle.placeDown()
        turtle.up()
    end
end

--Checks wether to run PlaceBlock when it finds a block below itself, or goingDown if it does not detect a block below itself.
DownPlace = function(slot,chestslot)
    if turtle.detectDown() then
        PlaceBlock(slot,chestslot)
    else
        goingDown(slot,chestslot)
    end
end

DownPlaceSlab = function(slot,chestslot)
    if turtle.detectDown() then
        PlaceSlab(slot,chestslot)
    else
        goingDownSlab(slot,chestslot)
    end
end

--This adds the small double slab supports underneath the path
placeUnderPath = function(slot,chestslot)
    turtle.digDown()
    turtle.down()
    turtle.digDown()
    CheckslotCount(slot,chestslot)
    turtle.select(uPath)
    turtle.placeDown()
    turtle.placeDown()
    turtle.up()
end

--Uses the value of y set by the function goingDown to place two slabs in order to fill the whole column.
PlaceSlab = function(slot,chestslot)
    for i = 1, y-1 do
        CheckslotCount(slot,chestslot)
        turtle.select(slot)
        turtle.placeDown()
        turtle.placeDown()
        turtle.up()
    end
end

--======================================================================
-- Pylon Building Function
--======================================================================

BuildPylon = function()
    p = p + 1
    turtle.digDown()
    turtle.up()

    y=0
    DownPlace(Edge,EdgeEnChest)

    turtle.up()
    turtle.dig()
    turtle.forward()
    turtle.down()

    placeUnderPath(uPath,uPathEnChest)

    turtle.select(cPath)
    turtle.placeDown()
    turtle.turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    placeUnderPath(uPath,uPathEnChest)

    turtle.turnRight()
    turtle.dig()
    turtle.forward()

    y = 0
    DownPlaceSlab(uPath,uPathEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    y = 0
    DownPlace(Edge,EdgeEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    y = 0
    DownPlaceSlab(uPath,uPathEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    y = 0
    DownPlaceSlab(uPath,uPathEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    y = 0
    DownPlace(Edge,EdgeEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.dig()
    turtle.forward()
    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.digDown()

    y=0
    DownPlaceSlab(uPath,uPathEnChest)

    turtle.select(Edge)
    turtle.placeDown()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.select(cPath)
    turtle.placeDown()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.select(cPath)
    turtle.placeDown()

    --Clean Up and Restock Inventory
    dumpCrap()
    CheckslotCount(cPath,cPathEnChest)
    CheckslotCount(Edge,EdgeEnChest)
    CheckslotCount(uPath,uPathEnChest)

end

--==========================================================================
-- Main Railway building Script
--==========================================================================

for i = 1, dis do
    if i % 28 == 0 then
        BuildPylon()
        turtle.forward()
        turtle.forward()
        --Print out progress
        endmoves = turtle.getFuelLevel()
        moves = startmoves - endmoves
        print( p .. " of " .. PylonCount .. " Pylons built")
        print( turtle.getFuelLevel() .. " = Current Fuel Level")
        print("I've moved " .. moves .. " meters so far.")
        print("===============================")
    end

checkHeight()

 turtle.digDown()
 turtle.select(uPath)
 turtle.placeDown()
 turtle.turnLeft()
 turtle.dig()
 turtle.select(Edge)
 turtle.place()

 turtle.turnRight()
 turtle.turnRight()
 turtle.dig()

 turtle.select(Edge)
 turtle.place()

 turtle.turnLeft()
 turtle.dig()

 turtle.forward()
 turtle.turnRight()
 turtle.turnRight()
 turtle.select(cPath)
 turtle.place()

 turtle.turnRight()
 turtle.turnRight()

 if i % 4 == 0 then
    dumpCrap()
 end

 CheckslotCount(cPath,cPathEnChest)
 CheckslotCount(Edge,EdgeEnChest)
 CheckslotCount(uPath,uPathEnChest)
 print( i .. " of " .. dis .. " meters of railway built")
end