passage

--cc:Tweaked: Passage
--pastebin get xzvapSjN passage.lua
--passage 10

local nav = require("navigation")
local inv = require("inventory")
local timer = require("timer")
local sides = require("sides")

local COBBLE = { name = "minecraft:cobblestone" }
local GLASS= { name = "minecraft:glass" }



function place(item)
    if turtle.detect() then turtle.dig() end
    if not inv.findAndSelect(item) then return false end

    turtle.place()
    return true
end


function placeDown(item)
    if turtle.detectDown() then turtle.digDown() end
    if not inv.findAndSelect(item) then return false end

    turtle.placeDown()
    return true
end

function placeUp(item)
    if turtle.detectDown() then turtle.digDown() end
    if not inv.findAndSelect(item) then return false end

    turtle.placeUp()
    return true
end

function placeLeft(item)
    nav.turnTo(sides.left)
    return place(item)
end

function placeRight(item)
    nav.turnTo(sides.right)
    return place(item)
end


local length = 0
local windowEvery = 5



local function checkParameters(length, windowEvery)
    --local fuelNeeded = (length * 3) + 1  -- 1 for endcap
    --checkFuel(fuelNeeded)

    local glassNeeded = math.ceil(length / windowEvery) * 2 + 1  -- plus one for endcap
    local glassIHave = inv.count(GLASS)
    if glassIHave < glassNeeded then
        print("Please add "..(glassNeeded - glassIHave).." more glass")
        return false
    end

    local bricksNeeded = length * 6 - glassNeeded + 1 -- plus one for endcap
    local bricksIHave = inv.count(COBBLE)
    if bricksIHave < bricksNeeded then
        print("Please add "..(bricksNeeded - bricksIHave).." more cobblestone")
        return false
    end

    return true

end

local function surround(window)
    WINDOW = GLASS
    if not window then WINDOW = COBBLE end

    placeDown(COBBLE)
    placeLeft(COBBLE)
    nav.up()
    placeLeft(WINDOW)
    placeUp(COBBLE)
    placeRight(WINDOW)
    nav.down()
    placeRight(COBBLE)
end


---- Main Loop
local tArgs = { ... }

if #tArgs ~= 2 then
        print( "Usage: passage <distance> <window every n>" )
        return false
end

-- Mine in a quarry pattern until we hit something we can't dig
local length        = tonumber( tArgs[1] )
local windowEvery   = tonumber( tArgs[2] )

if not checkParameters(length, windowEvery) then return end

timer.start()

for n=1,length do
    nav.turnTo(sides.front)
    nav.forward()
    surround(n % windowEvery == 0)
end

nav.turnTo(sides.front)
place(COBBLE)
nav.up()
place(GLASS)
nav.down()

print("Completed in "..timer.format())