Wool Image Printer

-- +--------------------------------------------------------+
-- |                                                        |
-- |                   Wool Image Printer                   |
-- |                                                        |
-- +--------------------------------------------------------+

local version = "Version 1.0.0"

-- By Jeffrey Alexander, aka Bomb Bloke.
-- Loads GIF or paintutils images and has a turtle construct them.
-- http://www.computercraft.info/forums2/index.php?/topic/28727-cc164-wool-image-printer/

-- ----------------------------------------------------------
-- Variable Declarations
-- ----------------------------------------------------------

local fileName = ...

local wool, node, pos, slots, img, starty, startNode = {}, {}, {}, {}

local facing = {"north","east","south","west"}
local amounts = {[0] = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
local names = {[0] = "White", "Orange", "Magenta", "Light Blue", "Yellow", "Lime", "Pink", "Gray", "Light Gray", "Cyan", "Purple", "Blue", "Brown", "Green", "Red", "Black"}
local blocks = {["minecraft:wool"] = true, ["minecraft:stained_hardened_clay"] = true, ["minecraft:stained_glass"] = true, ["minecraft:stained_glass_pane"] = true, ["minecraft:concrete"] = true}

for i = 0, 15 do wool[2^i] = i end

-- ----------------------------------------------------------
-- Function Declarations
-- ----------------------------------------------------------

-- Accepts strings representing compass-facings to turn the turtle.
local function faceDirection(targetdirection)
    local tardir = 1
    for i=1,4 do if targetdirection == facing[i] then tardir = i end end

    if tardir < pos.direction then
        if tardir == 1 and pos.direction == 4 then
            while not turtle.turnRight() do end
        else
            for i=1,pos.direction-tardir do while not turtle.turnLeft() do end end
        end
    elseif tardir > pos.direction then
        if tardir == 4 and pos.direction == 1 then
            while not turtle.turnLeft() do end
        else
            for i=1,tardir-pos.direction do while not turtle.turnRight() do end end
        end
    end

    pos.direction = tardir
end

-- Move ahead a block, keeping track of the turtle's position.
local function forward(amount)
    if not amount then amount = 1 end

    while not turtle.forward() do
        turtle.dig()
        turtle.attack()
    end

    if pos.direction == 1 then pos.z = pos.z - amount
    elseif pos.direction == 2 then pos.x = pos.x + amount
    elseif pos.direction == 3 then pos.z = pos.z + amount
    else pos.x = pos.x - amount end
end

-- Same again but non-destructive.
local function safeForward(amount)
    if not amount then amount = 1 end
    for i = 1, amount do repeat until turtle.forward() end

    if pos.direction == 1 then pos.z = pos.z - amount
    elseif pos.direction == 2 then pos.x = pos.x + amount
    elseif pos.direction == 3 then pos.z = pos.z + amount
    else pos.x = pos.x - amount end
end

local function turn(tardir)
    if tardir == "left" then
        while not turtle.turnLeft() do end
        pos.direction = pos.direction - 1
        if pos.direction < 1 then pos.direction = 4 end
    elseif tardir == "right" then
        while not turtle.turnRight() do end
        pos.direction = pos.direction + 1
        if pos.direction > 4 then pos.direction = 1 end
    end
end

-- Travel to a co-ordinate.
local function goToPos(target,digger)
    while (pos.x ~= node[target][1]) or (pos.y ~= node[target][2]) or (pos.z ~= node[target][3]) do
        if pos.y > node[target][2] then
            if digger then
                while not turtle.down() do
                    turtle.digDown()
                    turtle.attackDown()
                end
                pos.y = pos.y - 1
            elseif turtle.down() then pos.y = pos.y - 1 end
        elseif pos.y < node[target][2] then
            if digger then
                while not turtle.up() do
                    turtle.digUp()
                    turtle.attackUp()
                end
                pos.y = pos.y + 1
            elseif turtle.up() then pos.y = pos.y + 1 end
        end

        if pos.x > node[target][1] then
            if pos.direction ~= 4 then faceDirection("west") end
            if digger then forward() elseif turtle.forward() then pos.x = pos.x - 1 end
        elseif pos.x < node[target][1] then
            if pos.direction ~= 2 then faceDirection("east") end
            if digger then forward() elseif turtle.forward() then pos.x = pos.x + 1 end
        end

        if pos.z > node[target][3] then
            if pos.direction ~= 1 then faceDirection("north") end
            if digger then forward() elseif turtle.forward() then pos.z = pos.z - 1 end
        elseif pos.z < node[target][3] then
            if pos.direction ~= 3 then faceDirection("south") end
            if digger then forward() elseif turtle.forward() then pos.z = pos.z + 1 end
        end
    end

    faceDirection(node[target][4])
end

local function getSlotName(slotNum)
    local data = turtle.getItemDetail(slotNum)
    if not data then return nil else return data.name end
end

local function mapSlots()
    slots = {}
    for i = 1, 16 do
        local data = turtle.getItemDetail(i)
        if data and blocks[data.name] then slots[data.damage] = i end
    end
end

-- ----------------------------------------------------------
-- Initialisation
-- ----------------------------------------------------------

term.clear()
term.setCursorPos(1, 1)

if fs.exists("progress.txt") then
    print("Build already in progress; resume? ")

    if read():lower():sub(1, 1) == "y" then
        local file = fs.open("progress.txt", "r")
        local data = textutils.unserialise(file.readAll())
        file.close()
        fileName, starty, startNode = data[1], data[2], data[3]
    end

    print()
end

if not fs.exists(fileName) then
    if fs.exists(fileName .. ".nfp") then
        fileName = fileName .. ".nfp"
    elseif fs.exists(fileName .. ".gif") then
        fileName = fileName .. ".gif"
    else error("Can't find the specified image file.") end
end

if fileName:lower():sub(-4) == ".gif" then
    if not bbpack then
        if not (fs.exists("bbpack") or fs.exists(shell.resolve("bbpack"))) then
            shell.run("pastebin get cUYTGbpb bbpack")
            os.loadAPI(shell.resolve("bbpack"))
        else os.loadAPI(fs.exists("bbpack") and "bbpack" or shell.resolve("bbpack")) end
    end

    if not GIF then
        if not (fs.exists("GIF") or fs.exists(shell.resolve("GIF"))) then
            shell.run("pastebin get 5uk9uRjC GIF")
            os.loadAPI(shell.resolve("GIF"))
        else os.loadAPI(fs.exists("GIF") and "GIF" or shell.resolve("GIF")) end
    end

    img = GIF.toPaintutils(GIF.loadGIF(fileName))
else
    img = paintutils.loadImage(fileName)
end

-- Strip any empty rows from the bottom of the image:
for y = #img, 1, -1 do
    local row, found = img[y], false

    for x = 1, #row do if row[x] > 0 then
        found = true
        break
    end end

    if found then break else img[y] = nil end
end

-- Strip any empty columns from the right of the image:
for y = 1, #img do
    local row = img[y]

    for x = #row, 1, -1 do if row[x] > 0 then
        break
    else
        row[x] = nil
    end end
end

if not startNode then
    for y = 1, #img do
        local row = img[y]
        for x = 1, #row do
            local thisCol = wool[row[x]]
            if thisCol then amounts[thisCol] = amounts[thisCol] + 1 end
        end
    end

    local flip = false

    print("Requirements:")
    for i = 0, 15 do if amounts[i] > 0 then
        write(names[i] .. ": " .. amounts[i])

        if flip then
            print()
        else
            local x, y = term.getCursorPos()
            term.setCursorPos(20, y)
        end

        flip = not flip
    end end

    print()
    if not flip then print() end

    write("Proceed? ")

    if read():lower():sub(1, 1) ~= "y" then return end

    starty = 1
    print()
end

-- ----------------------------------------------------------
-- Determine Position
-- ----------------------------------------------------------

-- Ping the GPS servers until I get a valid reading:
if peripheral.find("modem") then
    local tempx, tempy, tempz
    while tempx == nil or tempy == nil or tempz == nil do
        tempx, tempy, tempz = gps.locate(5)
        sleep(5)
    end

    while not turtle.forward() do while not turtle.turnLeft() do end end
    pos.x,pos.y,pos.z = gps.locate(5)

    if pos.x < tempx then pos.direction = 4
    elseif pos.x > tempx then pos.direction = 2
    elseif pos.z < tempz then pos.direction = 1
    else pos.direction = 3 end

    repeat until turtle.back()
    pos.x,pos.y,pos.z = gps.locate(5)
    print("I'm at "..pos.x..","..pos.y..","..pos.z..", I have "..turtle.getFuelLevel().." fuel, and I'm facing "..facing[pos.direction]..".")
else
    pos.x,pos.y,pos.z,pos.direction = 0, 0, 0, 1
    print("I have "..turtle.getFuelLevel().." fuel, but I don't know where I am. If I have to be restarted, manually place me back at my initial position first.")
end

print()

mapSlots()
node[1] = startNode or {pos.x, pos.y, pos.z, facing[pos.direction]}

if pos.y > node[1][2] then
    node[2] = {node[1][1], pos.y, node[1][3], facing[pos.direction]}
    goToPos(2)
    goToPos(1)
end

-- ----------------------------------------------------------
-- Primary Work Loop
-- ----------------------------------------------------------

for y = starty, #img do
    local file = fs.open("progress.txt", "w")
    file.write(textutils.serialise({fileName, y, node[1]}))
    file.close()

    local thisRow = img[#img - y + 1]

    if y + #thisRow + 10 > turtle.getFuelLevel() then
        print("Low of energy. Please provide fuel items.")

        goToPos(1)

        repeat
            os.pullEvent("turtle_inventory")

            for i = 1, 16 do
                local slot = getSlotName(i)
                if slot and not blocks[slot] then
                    turtle.select(i)
                    turtle.refuel()
                end
            end
        until turtle.getFuelLevel() > y + #thisRow + 10
    end

    node[2] = {node[1][1], node[1][2] + y, node[1][3], node[1][4]}
    goToPos(2)

    for x = 1, #thisRow do
        safeForward()

        local thisCol = wool[thisRow[x]]
        if thisCol and not turtle.detectDown() then
            if not slots[thisCol] or turtle.getItemCount(slots[thisCol]) == 0 then
                mapSlots()

                if not slots[thisCol] or turtle.getItemCount(slots[thisCol]) == 0 then
                    print("Out of " .. names[thisCol] .. "!")

                    node[3] = {pos.x, pos.y, pos.z, node[1][4]}

                    goToPos(2)
                    goToPos(1)

                    repeat
                        os.pullEvent("turtle_inventory")
                        mapSlots()
                    until slots[thisCol] and turtle.getItemCount(slots[thisCol]) > 0

                    goToPos(2)
                    goToPos(3)
                end
            end

            turtle.select(slots[thisCol])
            turtle.placeDown()
        end
    end

    goToPos(2)
end

goToPos(1)

print("Done!")
fs.delete("progress.txt")