quarry

--[[

    This program tells the turtle to dig a quarry with specific dimensions
    x is the horizontal space to the right of the turtle plus the block in front
    y is the depth of the quarry
    z is the space in front of the turtle

]]

--[[ Functions ]]

-- Breaks a 3 block tall column in front of the turtle and moves forward 1
local function fwdThree()
    while not turtle.forward() do
        turtle.dig()
    end
    turtle.digUp()
    turtle.digDown()
end

local function fwd()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function dwn()
    while not turtle.down() do
        turtle.digDown()
    end
end

local function up()
    while not turtle.up() do
        turtle.digUp()
    end
end

local function enoughFuel(x, y, z)
    return true
end

--[[ Main ]]

-- Ask for dimensions
print("How much in front of me? (z)")
local z = read()
print("How much horizontal space? (x)")
local x = read()
print("How deep? (y)")
local y = read()

-- Check fuel
if not enoughFuel(x, y, z) then
    print("Please refuel")
end

-- Dig
fwd() -- Move into quarry space
up()

local y_threes = y / 3
local y_remainder = y % 3

for i = 1, y_threes do
    dwn()
    dwn()
    dwn()
    turtle.digDown()

    -- Dig out layer
    for k = 1, x - 1 do
        for j = 1, z - 1 do
            fwdThree()
        end
        for j = 1, z - 1 do
            turtle.back()
        end
        turtle.turnRight()
        fwdThree()
        turtle.turnLeft()
    end
    for j = 1, z - 1 do
        fwdThree()
    end
    for j = 1, z - 1 do
        turtle.back()
    end
    turtle.turnLeft()
    for k = 1, x - 1 do
        fwd()
    end
    turtle.turnRight()
end

for i = 1, y_remainder do
    dwn()
end
turtle.digDown()

-- Dig out layer
for k = 1, x - 1 do
    for j = 1, z - 1 do
        fwdThree()
    end
    for j = 1, z - 1 do
        turtle.back()
    end
    turtle.turnRight()
    fwdThree()
    turtle.turnLeft()
end
for j = 1, z - 1 do
    fwdThree()
end
for j = 1, z - 1 do
    turtle.back()
end
turtle.turnLeft()
for k = 1, x - 1 do
    fwd()
end
turtle.turnRight()

for i = 1, y - 1 do
    up()
end
turtle.back()