farming turtle scrits
-- Turtle farm by JackMacWindows
--
-- This is a simple farming script for ComputerCraft turtles. To use, simply
-- place a tilling turtle on top of a farming region, place a wired modem
-- connected to a chest next to the turtle, and run this script.
--
-- Features:
-- * Fully automatic field tending
-- * Automatic tilling and planting to reduce setup time
-- * Zero configuration to start a basic farm
-- * Boundaries are automatically detected, so no need to calculate size
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-- * Non-rectangular and non-flat fields supported
-- * Recovery after being unloaded
-- * Automatic unloading and refueling from one or more chests
--
-- To create a farm, create a complete boundary around the dirt or grass area
-- that you want the farm to be inside. Then add water to ensure the field stays
-- fully watered. The field may be any height - the turtle will automatically
-- move up or down to continue farming. The field may also be non-rectangular,
-- but it will not detect single holes in a straight line going across the field.
-- (e.g. if a boundary is at (100, 0) to (100, 100), the boundary may not have a
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-- hole taken out at (100, 25) to (100, 50).)
--
-- The turtle dispenses items when it reaches the origin point, which is the
-- place where the turtle was when the farm was started. This point must have a
-- modem next to it, with one or more chests placed next to that modem. The
-- program will prompt you to set this up if not present. (Make sure to right-
-- click the modem to turn it red and enable it.) Whenever the turtle returns to
-- this point, it will dispense all items except one stack of seeds and one stack
-- of fuel. If either of these stacks are not present, it will pick them up from
-- the chests.
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--
-- Farms may have multiple different types of crops, and the turtle will attempt
-- to replace them with the same type of seed. However, these will have to be
-- planted beforehand - when planting the first crops, it will use whatever
-- seeds are found in the chest or turtle first.
--
-- If you'd like to add custom modded crops, scroll down to the "add your own
-- here" sections, and fill out the templates for the blocks and items you want.
--
-- If you need any help, you may ask on the ComputerCraft Discord server at
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-- https://discord.computercraft.cc.

-- MIT License
--
-- Copyright (c) 2022 JackMacWindows
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in all
-- copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-- SOFTWARE.

local x, y, z = 0, 0, 0
local direction = 0
local invertDirection = false

-- Ground blocks that are part of the farm
local groundBlocks = {
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    ["minecraft:dirt"] = true,
    ["minecraft:grass_block"] = true,
    ["minecraft:farmland"] = true,
    ["minecraft:water"] = true,
    ["minecraft:flowing_water"] = true,
    -- add your own here:
    --["<yourmod>:<block>"] = true,
}

-- Blocks that are crops, with their maximum ages
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local cropBlocks = {
    ["minecraft:wheat"] = 7,
    ["minecraft:carrots"] = 7,
    ["minecraft:potatoes"] = 7,
    ["minecraft:beetroots"] = 3,
    -- add your own here:
    --["<yourmod>:<block>"] = <maximum age>,
}

-- Mappings of crop blocks to seed items
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local seeds = {
    ["minecraft:wheat"] = "minecraft:wheat_seeds",
    ["minecraft:carrots"] = "minecraft:carrot",
    ["minecraft:potatoes"] = "minecraft:potato",
    ["minecraft:beetroots"] = "minecraft:beetroot_seeds",
    -- add your own here:
    --["<yourmod>:<block>"] = "<yourmod>:<seed>",
}

-- Fuel types to pull from a chest if no fuel is in the inventory
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local fuels = {
    ["minecraft:coal"] = true,
    ["minecraft:charcoal"] = true,
    ["minecraft:lava_bucket"] = true,
    -- add your own here:
    --["<yourmod>:<item>"] = true,
}

local seedItems = {}
for k, v in pairs(seeds) do seedItems[v] = k end
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local function writePos()
    local file = fs.open("jackmacwindows.farm-state.txt", "w")
    file.writeLine(x)
    file.writeLine(y)
    file.writeLine(z)
    file.writeLine(direction)
    file.writeLine(invertDirection and "true" or "false")
    file.close()
end
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local function refuel()
    if turtle.getFuelLevel() == "unlimited" or turtle.getFuelLevel() == turtle.getFuelLimit() then return end
    for i = 1, 16 do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            turtle.refuel(turtle.getItemCount() - 1)
            if turtle.getFuelLevel() == turtle.getFuelLimit() then return true end
        end
    end
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    if turtle.getFuelLevel() > 0 then return true
    else return false, "Out of fuel" end
end

local function forward()
    local ok, err = turtle.forward()
    if ok then
        if direction == 0 then x = x + 1
        elseif direction == 1 then z = z + 1
        elseif direction == 2 then x = x - 1
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        else z = z - 1 end
        writePos()
        return true
    elseif err:match "[Ff]uel" then
        ok, err = refuel()
        if ok then return forward()
        else return ok, err end
    else return false, err end
end

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local function back()
    local ok, err = turtle.back()
    if ok then
        if direction == 0 then x = x - 1
        elseif direction == 1 then z = z - 1
        elseif direction == 2 then x = x + 1
        else z = z + 1 end
        writePos()
        return true
    elseif err:match "[Ff]uel" then
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        ok, err = refuel()
        if ok then return forward()
        else return ok, err end
    else return false, err end
end

local function up()
    local ok, err = turtle.up()
    if ok then
        y = y + 1
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        writePos()
        return true
    elseif err:match "[Ff]uel" then
        ok, err = refuel()
        if ok then return forward()
        else return ok, err end
    else return false, err end
end

local function down()
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    local ok, err = turtle.down()
    if ok then
        y = y - 1
        writePos()
        return true
    elseif err:match "[Ff]uel" then
        ok, err = refuel()
        if ok then return forward()
        else return ok, err end
    else return false, err end
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end

local function left()
    local ok, err = turtle.turnLeft()
    if ok then
        direction = (direction - 1) % 4
        writePos()
        return true
    else return false, err end
end
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local function right()
    local ok, err = turtle.turnRight()
    if ok then
        direction = (direction + 1) % 4
        writePos()
        return true
    else return false, err end
end

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local function panic(msg)
    term.clear()
    term.setCursorPos(1, 1)
    term.setTextColor(colors.red)
    print("An unrecoverable error occured while farming:", msg, "\nPlease hold Ctrl+T to stop the program, then solve the issue described above, run 'rm jackmacwindows.farm-state.txt', and return the turtle to the start position. Don't forget to label the turtle before breaking it.")
    if peripheral.find("modem") then
        peripheral.find("modem", rednet.open)
        rednet.broadcast(msg, "jackmacwindows.farming-error")
    end
    local speaker = peripheral.find("speaker")
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    if speaker then
        while true do
            speaker.playNote("bit", 3, 12)
            sleep(1)
        end
    else while true do os.pullEvent() end end
end

local function check(ok, msg) if not ok then panic(msg) end end

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local function tryForward()
    local ok, err, found, block
    repeat
        found, block = turtle.inspect()
        if found then
            if groundBlocks[block.name] or cropBlocks[block.name] then
                ok, err = up()
                if not ok then return ok, err end
            else return false, "Out of bounds" end
        end
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    until not found
    ok, err = forward()
    if not ok then return ok, err end
    local lastY = y
    repeat
        found, block = turtle.inspectDown()
        if not found then
            ok, err = down()
            if not ok then return ok, err end
        end
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    until found
    if groundBlocks[block.name] then
        ok, err = up()
        if not ok then return ok, err end
        turtle.digDown()
    elseif not cropBlocks[block.name] then
        while y < lastY do
            ok, err = up()
            if not ok then return ok, err end
        end
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        ok, err = back()
        if not ok then return ok, err end
        return false, "Out of bounds"
    end
    return true
end

local function selectItem(item)
    local lut = {}
    if type(item) == "table" then
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        if item[1] then for _, v in ipairs(item) do lut[v] = true end
        else lut = item end
    else lut[item] = true end
    local lastEmpty
    for i = 1, 16 do
        local info = turtle.getItemDetail(i)
        if info and lut[info.name] then
            turtle.select(i)
            return true, i
        elseif not info and not lastEmpty then lastEmpty = i end
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    end
    return false, lastEmpty
end

local function handleCrop()
    local found, block = turtle.inspectDown()
    if not found then
        if selectItem(seedItems) then turtle.placeDown() end
    elseif block.state.age == cropBlocks[block.name] then
        local seed = seeds[block.name]
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        turtle.select(1)
        turtle.digDown()
        turtle.suckDown()
        local item = turtle.getItemDetail()
        if (not item or item.name ~= seed) and not selectItem(seed) then return end
        turtle.placeDown()
    end
end

local function exchangeItems()
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    local inventory, fuel, seed = {}, nil, nil
    for i = 1, 16 do
        turtle.select(i)
        local item = turtle.getItemDetail(i)
        if item then
            if not seed and seedItems[item.name] then
                seed = {slot = i, name = item.name, count = item.count, limit = turtle.getItemSpace(i)}
            elseif not turtle.refuel(0) then
                inventory[item.name] = inventory[item.name] or {}
                inventory[item.name][i] = item.count
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            elseif not fuel then
                fuel = {slot = i, name = item.name, count = item.count, limit = turtle.getItemSpace(i)}
            end
        end
    end
	local modem = peripheral.find("modem", function(_, v) return not v.isWireless() end)
	local tries = 0
	while not modem and tries < 4 do
		tries = tries + 1
		check(left())
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		modem = peripheral.find("modem", function(_, v) return not v.isWireless() end)
	end
	if not modem then panic("Could not find modem!") end
    local name = modem.getNameLocal()
    for _, chest in ipairs{peripheral.find("minecraft:chest")} do
        local items = chest.list()
        for i = 1, chest.size() do
            if items[i] then
                local item = items[i].name
                if inventory[item] then
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                    for slot, count in pairs(inventory[item]) do
                        local d = chest.pullItems(name, slot, count, i)
                        if d == 0 then break end
                        if count - d <= 0 then inventory[item][slot] = nil
                        else inventory[item][slot] = count - d end
                    end
                    if not next(inventory[item]) then inventory[item] = nil end
                elseif fuel and fuel.count < fuel.limit and item == fuel.name then
                    local d = chest.pushItems(name, i, fuel.limit - fuel.count, fuel.slot)
                    fuel.count = fuel.count + d
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                elseif seed and seed.count < seed.limit and item == seed.name then
                    local d = chest.pushItems(name, i, seed.limit - seed.count, seed.slot)
                    seed.count = seed.count + d
                end
            end
            if not next(inventory) then break end
        end
        if not next(inventory) then break end
    end
    if next(inventory) then
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        for _, chest in ipairs{peripheral.find("minecraft:chest")} do
            local items = chest.list()
            for i = 1, chest.size() do
                if not items[i] then
                    local item, list = next(inventory)
                    for slot, count in pairs(list) do
                        local d = chest.pullItems(name, slot, count, i)
                        if d == 0 then break end
                        if count - d <= 0 then list[slot] = nil
                        else list[slot] = count - d end
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                    end
                    if not next(list) then inventory[item] = nil end
                end
                if not next(inventory) then break end
            end
            if not next(inventory) then break end
        end
    end
    if not fuel or not seed then
        for _, chest in ipairs{peripheral.find("minecraft:chest")} do
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            local items = chest.list()
            for i = 1, chest.size() do
                if items[i] and ((fuel and items[i].name == fuel.name and fuel.count < fuel.limit) or (not fuel and fuels[items[i].name])) then
                    local d = chest.pushItems(name, i, fuel and fuel.count - fuel.limit, 16)
                    if fuel then fuel.count = fuel.count + d
                    else fuel = {name = items[i].name, count = d, limit = turtle.getItemSpace(16)} end
                end
                if items[i] and ((seed and items[i].name == seed.name and seed.count < seed.limit) or (not seed and seedItems[items[i].name])) then
                    local d = chest.pushItems(name, i, seed and seed.count - seed.limit, 1)
                    if seed then seed.count = seed.count + d
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                    else seed = {name = items[i].name, count = d, limit = turtle.getItemSpace(1)} end
                end
                if (fuel and fuel.count >= fuel.limit) and (seed and seed.count >= seed.limit) then break end
            end
            if (fuel and fuel.count >= fuel.limit) and (seed and seed.count >= seed.limit) then break end
        end
    end
end

if fs.exists("jackmacwindows.farm-state.txt") then
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    local file = fs.open("jackmacwindows.farm-state.txt", "r")
    x, y, z, direction = tonumber(file.readLine()), tonumber(file.readLine()), tonumber(file.readLine()), tonumber(file.readLine())
    invertDirection = file.readLine() == "true"
    file.close()
    -- check if we were on a boundary block first
    local found, block, ok, err, boundary
    local lastY = y
    repeat
        found, block = turtle.inspectDown()
        if not found then check(down()) end
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    until found
    if groundBlocks[block.name] then
        check(up())
        turtle.digDown()
    elseif not cropBlocks[block.name] then
        if y == lastY then lastY = lastY + 1 end
        while y < lastY do check(up()) end
        while not back() do check(up()) end
        boundary = true
    end
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    if direction == 1 or direction == 3 then
        -- we were in the middle of a rotation, finish that before continuing
        local mv = (direction == 0) == invertDirection and left or right
        if boundary then
            check(mv())
            check(mv())
            check(tryForward())
            invertDirection = not invertDirection
            mv = mv == left and right or left
            writePos()
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        end
        check(mv())
        handleCrop()
        if x == 0 and z == 0 then
            while y > 0 do check(down()) end
            while y < 0 do check(up()) end
            exchangeItems()
        end
    end
elseif not peripheral.find("minecraft:chest") or not peripheral.find("modem", function(_, m) return not m.isWireless() end) then
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    print[[
Please move the turtle to the starting position next to a modem with a chest.
The expected setup is the turtle next to a wired modem block, with a chest next to that modem block.
This program cannot run until placed correctly.
]]
    return
else exchangeItems() end

local ok, err
while true do
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    ok, err = tryForward()
    if not ok then
        if err == "Out of bounds" then
            local mv = (direction == 0) == invertDirection and left or right
            check(mv())
            ok, err = tryForward()
            if not ok then
                if err == "Out of bounds" then
                    check(mv())
                    check(mv())
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                    check(tryForward())
                    invertDirection = not invertDirection
                    mv = mv == left and right or left
                    writePos()
                else panic(err) end
            end
            check(mv())
        else panic(err) end
    end
    handleCrop()
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    if x == 0 and z == 0 then
        while y > 0 do check(down()) end
        while y < 0 do check(up()) end
        exchangeItems()
    elseif peripheral.find("modem") then
        x, y, z = 0, 0, 0
        exchangeItems()
    end
    if turtle.getFuelLevel() < 100 then refuel() end
end
farming turtle scrits How to get it? farming turtle scrits

farming turtle scrits