lavaRefuel.lua (refuel or drain lava) 2025/02/02

version = 20250202.1430
--[[
    pastebin get kFZsXu99 lavaRefuel.lua
    Last edited: see version YYYYMMDD.HHMM
    Will auto-download clsTurtle.lua
    Used to refuel a turtle on a lava lake or drain lava
    Use: 'lavaRefuel' in turtle terminal
]]
local Turtle = require("lib.clsTurtle")
-- Turtle class (T), menu class (menu) and other libraries made Global

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

function checkLibs(libDir, filename)
    local fileExists = false
    if fs.exists(libDir) then
        if not fs.isDir(libDir) then
            fs.move(libDir, libDir.."Renamed")
            fs.makeDir(libDir)
        end
    else
        fs.makeDir(libDir)
    end
    if fs.exists(fs.combine(libDir, filename)) or fs.exists(fs.combine(libDir, filename..".lua")) then
        fileExists = true
    end
    return fileExists
end

function getLavaStrip(y)
    local block = T:isWaterOrLava("down") -- will automatically fill bucket with lava and refuel
    local length = 0
    local lavaPresent = false
    local full = false
    -- while lava below, just started or moved forward < 3
    while (block == "minecraft:lava" or block == "minecraft:flowing_lava" or length < 3) and not full do --will automatically fill bucket with lava
        if T:forward(1) then
            length = length + 1
            y = y + 1
        end
        block = T:isWaterOrLava("down")

        print("Block below: "..tostring(block))
        if block == "minecraft:lava" or block == "minecraft:flowing_lava" then
            lavaPresent = true
        end
        if turtle.getFuelLevel() >= turtle.getFuelLimit() then
            full = true
            lavaPresent = false
        end
    end
    T:go("L2F"..length + 1)
    y = y - length - 1
    block = T:isWaterOrLava("down")
    while block == "minecraft:lava" or block == "minecraft:flowing_lava" do
        T:forward(1)
        y = y - 1
        block = T:isWaterOrLava("down")
    end
    turtle.back()
    y = y + 1
    T:go("L2")
    return lavaPresent, y
end

function goHome(x, y)
    if y > 0 then
        utils.goBack(y)
    elseif y < 0 then
        T:forward(math.abs(y))
    end
    if x > 0 then
        T:go("L1F"..x.."R1")
    elseif x < 0 then
        T:go("R1F"..math.abs(x).."L1")
    end
end

function main()
    local side = ''
    while side == '' do
        clear()
        print("Place me in front of lava")
        print("Which side has more lava? (L C R)")
        print("Choose C for a single strip")
        side = read()
        if side == 'l' or side =='L' then
            side = 'L'
        elseif side == 'r' or side =='R' then
            side = 'R'
        else
            side = 'C'
        end
    end
    local doContinue = true
    if not checkLibs("lib", "clsTurtle") then
        -- use pastebin get to download clsTurtle to libs folder
        print("Missing clsTurtle.lua in libs directory")
        print("Attempting to obtain from Pastebin...")
        if shell.run("pastebin","get","tvfj90gK","lib/clsTurtle.lua") then
            print("clsTurtle.lua installed from Pastebin")
        else
            print("failed to install clsTurtle.lua from Pastebin")
            doContinue = false
        end
    end
    if doContinue then
        T = Turtle(false)
        clear()
        print("Current fuel: "..turtle.getFuelLevel().." / "..turtle.getFuelLimit())

        local lavaSlot = T:getItemSlot("minecraft:lava_bucket")
        if lavaSlot > 0 then
            turtle.select(lavaSlot)
            T:refuel(0) -- 0=force refuel
        end
        T:checkInventoryForItem({"minecraft:bucket", "minecraft:lava_bucket"}, {1,1}, true)
        T:refuel(0) -- 0=force refuel
        local x, y, width = 0, 0, 0
        local lavaPresent, y = getLavaStrip(y)
        if side ~= 'C' then -- not a single strip
            while lavaPresent do
                width = width + 1
                if side == 'R' then -- do strip on the right
                    T:go("R1F1L1")
                    x = x + 1
                else
                    T:go("L1F1R1")
                    x = x - 1
                end
                lavaPresent, y  = getLavaStrip(y)
                if turtle.getFuelLevel() >= turtle.getFuelLimit() then
                    lavaPresent = false
                    print("Max fuel "..turtle.getFuelLimit() .. " achieved")
                end
            end
            if width <= 0 then
                width = 1
            end
            goHome(x, y)
        end
    else
        print("Add missing files and restart")
    end
end

main()