fillarea.lua

tArgs = {...}
local rows = tonumber(tArgs[1])
local columns = tonumber(tArgs[2])
local enderchest_index = tonumber(tArgs[3] or -1)
y = 0

print(string.format("Filling %s by %s area with refill chest on index %s", rows, columns, enderchest_index))

function refillFromEnderchest()
    turtle.select(enderchest_index)
    turtle.placeUp()
    for i = 1,16 do 
        if i ~= enderchest_index then
            turtle.select(i)
            turtle.suckUp()
        end
    end
    print("Selecting ".. enderchest_index)
    turtle.select(enderchest_index)
    print("Digging up")
    turtle.digUp()
end

function fillDown()
    for i = 1,16 do 
        if i ~= enderchest_index then
            print(string.format("%s ~= %s", i, enderchest_index))
            turtle.select(i)
            if turtle.getItemCount(i) > 0 then
                turtle.placeDown()
                print("placing down item on index: "..i.." - " .. enderchest_index)
                return true
            end
        end
    end
    if enderchest_index ~= -1 then
        refillFromEnderchest()
        fillDown()
    end
    return false
end

function switchColumn(columnIndex)
    if columnIndex%2 ~= 0 then
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
    else
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
    end
end

for j = 1,rows do
    for i = 1,columns do 
        while turtle.down() do 
            y = y-1
        end
        while y<0 do
            y = y+1
            turtle.up()
            fillDown()
        end
        if tonumber(i) < tonumber(columns) then
            turtle.forward()
        end
    end
    if tonumber(j) < tonumber(rows) then
        switchColumn(j)
    end
end