diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..89fae0d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.log
+.treefarm.conf
diff --git a/dig.lua b/dig.lua
new file mode 100644
index 0000000..79c39c3
--- /dev/null
+++ b/dig.lua
@@ -0,0 +1,85 @@
+-- Created by Jef Roosens
+--
+-- This program lets you dig out a rectangle
+-- TODO return to surface option
+-- TODO arbitrary height instead of multiple of 3
+-- TODO item storage solution
+
+local logger = require("jlib.log").Logger:new{level = 3, filename = "dig.log"}
+local input = require("jlib.input")
+input.logger = logger
+local move = require("jlib.move").move
+move.logger = logger
+local fuel = require("jlib.fuel")
+fuel.logger = logger
+
+
+local function layer(width, depth, offset)
+    for i = 1, width do
+        -- Mine slice
+        move('f', depth - 1, { turtle.digUp, turtle.digDown })
+
+        -- Move to next slice
+        if i < width then
+            dir = (i + offset) % 2
+
+            if dir == 0 then turtle.turnLeft() else turtle.turnRight() end
+            move('f', 1, { turtle.digUp, turtle.digDown })
+            if dir == 0 then turtle.turnLeft() else turtle.turnRight() end
+        end
+    end
+end
+
+
+local function dig(width, depth, height, dir)
+    -- Dig initial blocks
+    turtle.digUp()
+    turtle.digDown()
+
+    local layers = height / 3
+    for j = 1, layers do
+        local offset = 0
+
+        if j % 2 == 0 and width % 2 == 0 then offset = 1 end
+        layer(width, depth, offset)
+        -- Move down a layer
+
+        if j < layers then
+            move(dir, 3)
+            if dir == 'd' then turtle.digDown() else turtle.digUp() end
+            turtle.turnLeft()
+            turtle.turnLeft()
+        end
+    end
+end
+
+
+local function main(args)
+    -- Take inputs
+    local width = tonumber(args[1]) or input.read_int("Width: ")
+    local depth = tonumber(args[2]) or input.read_int("Depth: ")
+    local height = tonumber(args[3]) or input.read_int("Height: ")
+    -- TODO add check for dir
+    local dir = args[4]
+
+    -- Make sure height is valid
+    -- TODO make program work with any height
+    if height % 3 ~= 0 then
+        return logger:log(3, "Height is not a multiple of 3.")
+    end
+
+    -- Check fuel level
+    -- The + 2 accounts for the moving between layers
+    local fuel_needed = (depth * width + 3) * (height / 3)
+    if not fuel.check(fuel_needed) then
+        return logger:log(1, "Insufficient fuel.")
+    end
+
+    -- Do the dig
+    dig(width, depth, height, dir)
+
+    logger:close()
+end
+
+
+main({...})
diff --git a/jlib/fuel.lua b/jlib/fuel.lua
new file mode 100644
index 0000000..1787958
--- /dev/null
+++ b/jlib/fuel.lua
@@ -0,0 +1,115 @@
+-- Created by Jef Roosens
+--
+-- This module contains functions which ease fuel management in a turtle
+
+
+-- local turtle = require('turtle')
+local module  = {}
+module.logger = require("jlib.log").Logger:new{level = -1}
+
+
+-- Refuel the turtle using the given slot; tries to optimize refuel speed by
+-- calculating needed refuel count
+--
+-- @param slot slot to refuel from
+-- @param goal refuel goal to reach
+-- @return wether the refuel was enough
+function module.refuel_from(slot, goal)
+    -- First, we get the current level
+    local start = turtle.getFuelLevel()
+
+    -- If we've already reached the goal, just return true
+    if start >= goal then return true end
+
+    -- Select the slot and refuel once
+    turtle.select(slot)
+    turtle.refuel(1)
+
+    -- Get the difference
+    local level = turtle.getFuelLevel()
+    local diff = level - start
+
+    -- If the diff is 0 the slot is empty or can't refuel, so return false
+    if diff == 0 then return false end
+
+    -- Calculate needed refuels
+    local needed = math.ceil((goal - level) / diff)
+
+    -- Do the refuel
+    turtle.refuel(needed)
+
+    -- Return wether or not we reached the goal
+    return turtle.getFuelLevel() >= goal
+
+end
+
+
+-- Check if the turtle has enough fuel; takes a table of preferred items
+--
+-- @param goal fuel goal to reach
+-- @param preferred table containing names of preferred items
+-- @return wether or not the fuel level was reached
+function module.check(goal, preferred)
+    -- Convert table to set for faster lookup
+    local set = {}
+
+    if preferred then
+        for _, v in ipairs(preferred) do
+            set[v] = true
+        end
+    end
+
+    -- Turtle needs to be able to get down at all times
+    local i, done = 1, turtle.getFuelLevel() >= goal
+
+    -- Instantly quit if it's already good
+    -- This check is mostly useful voor the logging aspect
+    if done then
+        module.logger:info("No refuel needed.")
+        return true
+    end
+
+    -- Store all non-preferred options
+    local options = {}
+
+    -- Iterate over all 16 slots, or stop earlier if possible
+    while not done and i <= 16 do
+        local data = turtle.getItemDetail(i)
+
+        if data and set[data.name] then
+            done = module.refuel_from(i, goal)
+
+        else
+            table.insert(options, i)
+
+        end
+
+        i = i + 1
+    end
+
+    -- Exit if goal has been reached
+    if done then
+        module.logger:info("Refueled using preferred.")
+
+        return true
+    end
+
+    -- Process non-preferred options
+    for _, j in pairs(options) do
+        done = module.refuel_from(j, goal)
+
+        if done then
+            module.logger:info("Refueled using non-preferred.")
+
+            return true
+        end
+    end
+
+    module.logger:warning(
+        "Refuel failed. Missing: " .. goal - turtle.getFuelLevel())
+
+    return false
+end
+
+
+return module
diff --git a/jlib/input.lua b/jlib/input.lua
new file mode 100644
index 0000000..ce1ca92
--- /dev/null
+++ b/jlib/input.lua
@@ -0,0 +1,28 @@
+-- Created by Jef Roosens
+--
+-- Useful functions for receiving input from the user
+
+local module = {}
+module.logger = require("jlib.log").Logger:new{level = -1}
+
+
+-- Read an integer
+--
+-- @param prompt prompt string to show
+-- @param negative wether or not the number can be negative; defaults to false
+function module.read_int(prompt, negative)
+    while true do
+        write(prompt)
+
+        local num = tonumber(read())
+        if num and num >= 0 or not negative then
+            module.logger:info("Input: " .. num)
+            return num
+        end
+
+        print("Please enter a valid number.")
+    end
+end
+
+
+return module
diff --git a/jlib/log.lua b/jlib/log.lua
new file mode 100644
index 0000000..ab69b9d
--- /dev/null
+++ b/jlib/log.lua
@@ -0,0 +1,86 @@
+-- Created by Jef Roosens
+--
+-- Module to add logging to a program. This module is integrated in all jlib
+-- functions.
+
+
+local module = {}
+
+
+-- Define class with default values
+local Logger = {
+    level = 2,
+    level_colors = {
+        colors.red, colors.orange, colors.yellow, colors.blue, colors.white},
+    prefixes = {"CRIT", "ERROR", "WARN", "INFO", "DEBUG"},
+    -- Explicit is better than implicit
+    filename = nil
+}
+
+
+-- Return a new logger 'object'.
+--
+-- @param level log level:
+-- (0) critical, (1) errors, (2) warnings, (3) info,(4) debug
+-- @param level_colors table containing color names for messages; order is
+-- { critical, errors, warnings, info, debug }. Only colors for the needed log
+-- level need to be provided: e.g. if the log level is (2) warnings, then only
+-- two colors need to be provided. If not provided, defaults to
+-- { red, orange, yellow, blue, white }.
+-- @param prefixes prefix to show for each log level
+-- @param filename log file to write to. If not supplied, log will only be
+-- outputted to stdout
+-- @return a logger 'object'
+function Logger:new(o)
+    o = o or {}
+    setmetatable(o, self)
+    self.__index = self
+
+    -- Open file handler
+    if o.filename then
+        o._file = fs.open(o.filename, "a")
+    end
+
+    return o
+end
+
+-- Log a message with the given level
+--
+-- @param level log level; levels higher than logger level get discarded
+-- @param message message to log
+-- @return wether or not the message was actually logged
+function Logger:log(level, message)
+    -- Exit if the level is too high
+    if level > self.level then return false end
+
+    -- Log to screen
+    local cur_color = term.getTextColor()
+    term.setTextColor(self.level_colors[level + 1])
+    term.write("[" .. self.prefixes[level + 1] .. "] ")
+    term.setTextColor(cur_color)
+    print(message)
+
+    -- Log to file
+    if self._file then
+        local line = "[" .. self.prefixes[level + 1] .. "] " .. message .. '\n'
+        self._file.write(line)
+        self._file.flush()
+
+    end
+end
+
+-- Just some convenience functions; wrappers around Logger:log
+function Logger:critical(message) self:log(0, message) end
+function Logger:error(message) self:log(1, message) end
+function Logger:warning(message) self:log(2, message) end
+function Logger:info(message) self:log(3, message) end
+function Logger:debug(message) self:log(4, message) end
+
+-- Close the logger a.k.a. close the log file handler
+function Logger:close()
+    if self._file then self._file.close() end
+end
+
+
+module.Logger = Logger
+return module
diff --git a/jlib/mine.lua b/jlib/mine.lua
new file mode 100644
index 0000000..d029d19
--- /dev/null
+++ b/jlib/mine.lua
@@ -0,0 +1,32 @@
+-- Created by Jef Roosens
+
+
+local module = {}
+module.logger = require("jlib.log").Logger:new{level = -1}
+
+
+-- Safely dig in given direction (aka account for falling blocks)
+--
+-- @param dir direction to dig (f, u, d)
+-- @return amount of blocks it broke
+function module.dig(dir)
+    local funcs = {
+        f = { turtle.detect, turtle.dig },
+        u = { turtle.detectUp, turtle.digUp },
+        d = { turtle.detectDown, turtle.digDown }
+    }
+
+    local i = 0
+
+    while funcs[dir][1]() do
+        funcs[dir][2]()
+        i = i + 1
+
+    end
+
+    module.logger:info("Mined " .. i .. " blocks")
+    return i
+end
+
+
+return module
diff --git a/jlib/move.lua b/jlib/move.lua
new file mode 100644
index 0000000..f4ccfd0
--- /dev/null
+++ b/jlib/move.lua
@@ -0,0 +1,50 @@
+-- Created by Jef Roosens
+--
+-- Utilities to ease movement using a turtle
+
+
+local dig = require("jlib.mine").dig
+local module = {}
+module.logger = require("jlib.log").Logger:new{level = -1}
+
+
+-- Safely move n blocks. This means accounting for gravel, trees growing...
+--
+-- @param dir direction to move (u, d, f)
+-- @param n number of blocks to move. If nil (or not supplied), 1 is taken as
+-- @param side_effect a function/table of functions which gets called after the
+-- turtle has moved 1 block. This can be used to extend the functionality of
+-- the function without having to re-write it.
+function module.move(dir, n, side_effect)
+    -- Default value
+    n = n or 1
+
+    local funcs = {
+        u = turtle.up,
+        d = turtle.down,
+        f = turtle.forward
+    }
+
+    for _ = 1, n do
+        dig(dir)
+        funcs[dir]()
+
+        -- Run the side-effect if given
+        if side_effect then
+            if type(side_effect) == "table" then
+                for _, f in pairs(side_effect) do
+                    f()
+                end
+
+            else
+                side_effect()
+
+            end
+        end
+    end
+
+    module.logger:info("Moved " .. n .. " blocks")
+end
+
+
+return module
diff --git a/tree.lua b/tree.lua
new file mode 100644
index 0000000..2f058e3
--- /dev/null
+++ b/tree.lua
@@ -0,0 +1,100 @@
+-- Created by Jef Roosens
+-- TODO: fix bug where if you start a 2x2 tree in the middle, the turtle will still end up on the bottom
+
+
+local fuel = require('jlib.fuel')
+local move = require('jlib.move').move
+
+
+-- Chop a tree in the given direction
+local function chop(tree_type, two_deep, go_down, return_to_start)
+    local i, data = 0
+    if go_down then _, data = turtle.inspectDown() else _, data = turtle.inspectUp() end
+
+    while data.name == tree_type do
+        -- Make sure we have enough fuel to get back up
+        fuel.check(i + 1)
+
+        if two_deep then turtle.dig() end
+        -- This also mines the block
+        if go_down then move('d') else move('u') end
+
+        i = i + 1
+        if go_down then _, data = turtle.inspectDown() else _, data = turtle.inspectUp() end
+    end
+
+    -- Dig one higher. This allows us to chop jungle trees, which often leave one block higher
+    if i > 0 and not go_down then
+        fuel.check(i + 1)
+        if two_deep then turtle.dig() end
+        move('u')
+
+        i = i + 1
+    end
+
+    -- Dig the final block
+    if two_deep then turtle.dig() end
+
+    -- Because we check the fuel level every time, we know for certain we can get back up/down
+    if return_to_start then
+        if go_down then move('u', i) else move('d', i) end
+    end
+end
+
+
+-- Determine tree type
+local _, data = turtle.inspect()
+local tree_type = data.name
+
+if not fuel.check(1) then
+    print("I need 1 fuel to start.")
+    return
+end
+
+-- Get into position
+turtle.dig()
+turtle.forward()
+
+-- Check if it's a two-deep tree
+local _, data = turtle.inspect()
+local two_deep, two_by_two, right = data.name == tree_type, false, false
+
+-- Check if it's a 2x2 tree
+if two_deep then
+    turtle.turnRight()
+    local _, data = turtle.inspect()
+    turtle.turnLeft()
+
+    two_by_two = data.name == tree_type
+
+    -- Check if we're on the right side instead
+    if not two_by_two then
+        turtle.turnLeft()
+        _, data = turtle.inspect()
+        turtle.turnRight()
+
+        two_by_two = data.name == tree_type
+        right = two_by_two
+    end
+end
+
+-- Chop the actual tree
+-- Chop left half
+chop(tree_type, two_deep, true, true)
+-- Come back down if it's not a two_by_two, else don't
+chop(tree_type, two_deep, false, not two_by_two)
+
+-- Get into position if it's a two-by-two
+if two_by_two then
+    if right then turtle.turnLeft() else turtle.turnRight() end
+    turtle.dig()
+    turtle.forward()
+    if right then turtle.turnRight() else turtle.turnLeft() end
+
+    -- Go back down, or dig second half
+    chop(tree_type, two_deep, true, false)
+
+    if right then turtle.turnRight() else turtle.turnLeft() end
+    turtle.forward()
+    if right then turtle.turnLeft() else turtle.turnRight() end
+end
diff --git a/treefarm.lua b/treefarm.lua
new file mode 100644
index 0000000..e71e079
--- /dev/null
+++ b/treefarm.lua
@@ -0,0 +1,211 @@
+-- Created by Jef Roosens
+local logger = require('jlib.log').Logger:new{level=3, filename="treefarm.log"}
+local fuel   = require('jlib.fuel')
+fuel.logger = logger
+local move   = require('jlib.move').move
+
+
+-- Chop a 1x1 tree
+--
+-- @param max_height height of tallest known tree
+--
+-- @return height of chopped tree if greater than known highest, otherwise
+-- known highest
+local function chop(max_height, log_name)
+    logger:log(3, "Chopping tree")
+
+    -- Make sure we have enough fuel for the largest known tree
+    fuel.check(2 * max_height + 1, { log_name })
+
+    -- Move one forward
+    move('f')
+
+    turtle.digDown()
+
+    -- Chop up until we no longer find logs
+    local _, data = turtle.inspectUp()
+
+    local height = 0
+    while data.name == log_name do
+        -- These checks most likely always succeed instantly thanks to the
+        -- tallest tree system
+        fuel.check(height, { log_name })
+
+        move('u', 1)
+        _, data = turtle.inspectUp()
+
+        height = height + 1
+    end
+
+    -- Move back down
+    move('d', height)
+
+    -- Return the new height if it's greater than the old
+
+    max_height = math.max(max_height, height)
+    logger:debug("Max height: " .. max_height)
+
+    return max_height
+end
+
+
+-- Select given item
+--
+-- @param item_name name of item to select
+--
+-- @return wether or not the item could be selected
+local function select_item(item_name)
+    for i = 1, 16 do
+        local data = turtle.getItemDetail(i)
+
+        if data and data.name == item_name then
+            turtle.select(i)
+            return true
+        end
+    end
+
+    return false
+end
+
+
+-- Do one cycle through the farm
+--
+-- @param max_height height of tallest known tree
+--
+-- @return new height of tallest known tree
+local function cycle(width, depth, max_height, sapling_name, log_name,
+    spacing)
+    logger:info("Starting cycle")
+
+    for i = 1, width do
+        -- Check for fuel to go through entire row
+        fuel.check((spacing + 1) * (depth - 1) + 2, { log_name })
+
+        for j = 1, depth do
+            local _, data = turtle.inspect()
+
+            -- Chop down the tree, or move forward
+            if data.name == log_name then
+                -- Gotta re-do the check from the beginning of this row
+                fuel.check(
+                    2 * max_height + 1 + (spacing + 1) * (depth - j) + 2,
+                    { log_name })
+
+                max_height = chop(max_height, log_name)
+
+            else
+                move('f')
+            end
+
+            -- Place down a sapling, if possible
+            if select_item(sapling_name) then
+                turtle.placeDown()
+            end
+
+            -- Pick up any dropped saplings
+            turtle.suckDown()
+
+            -- Move forward
+
+            if j < depth then
+                move('f', spacing)
+            else
+                move('f')
+            end
+        end
+
+        -- Turn
+        if i < width then
+            if i % 2 == 0 then turtle.turnLeft() else turtle.turnRight() end
+            fuel.check(spacing + 1, { log_name })
+            move('f', spacing + 1)
+            if i % 2 == 0 then turtle.turnLeft() else turtle.turnRight() end
+        end
+    end
+
+    return max_height
+end
+
+
+-- Do maintenance stuff: drop off items, and restock on saplings
+local function maintenance(width, depth, sapling_name, log_name)
+    logger:info("Doing maintenance")
+    fuel.check(6, { log_name })
+
+    -- Move towards sapling chest
+    move('f')
+    turtle.turnLeft()
+    move('f')
+
+    -- Deposite all saplings
+    while select_item(sapling_name) do turtle.drop(64) end
+
+    -- Get enough saplings
+    turtle.select(1)
+    turtle.suck(width * depth)
+
+    -- Move towards log chest
+    turtle.turnRight()
+    move('f')
+    turtle.turnLeft()
+
+    -- Deposite all logs
+    while select_item(log_name) do turtle.drop(64) end
+
+    -- Keep 10 logs for refueling
+    turtle.select(2)
+    turtle.suck(10)
+
+    -- Get back to start block
+    turtle.turnRight()
+    turtle.turnRight()
+    move('f')
+    turtle.turnRight()
+    move('f', 2)
+
+    logger:info("Maintenance finished")
+end
+
+
+local function main()
+    -- Load the settings, or quit if it fails
+    if not settings.load(".treefarm.conf") then
+        return logger:critical("Couldn't load configuration file. Please make sure it exists and doesn't contain syntax errors.")
+    end
+
+    -- Get all variables (API calls are slow)
+    local width, depth, spacing, border_width, log_name, sapling_name, delay =
+        settings.get("width"), settings.get("depth"), settings.get("spacing"),
+        settings.get("border_width"), settings.get("log_name"),
+        settings.get("sapling_name"), settings.get("delay")
+    local max_height = 0
+
+    logger:info("Settings loaded")
+
+    -- Start the main loop
+    logger:info("Starting main loop")
+    while true do
+        -- Get into start position for cycle
+        fuel.check(2, { log_name })
+        move('f', 2)
+
+        -- Run through two cycles
+        max_height = cycle(width, depth, max_height, sapling_name, log_name,
+            spacing)
+        turtle.turnRight()
+        turtle.turnRight()
+        sleep(delay)
+        max_height = cycle(width, depth, max_height, sapling_name, log_name,
+            spacing)
+
+        -- Do maintenance and subtract maintenance time from delay
+        fuel.check(border_width, { log_name })
+        move('f', border_width)
+
+        local seconds = os.clock()
+        maintenance(width, depth, sapling_name, log_name)
+        sleep(math.max(0, delay - os.clock() + seconds))
+    end
+end
+
+main()
diff --git a/tunnel.lua b/tunnel.lua
new file mode 100644
index 0000000..35fb3f6
--- /dev/null
+++ b/tunnel.lua
@@ -0,0 +1,26 @@
+-- Created by Jef Roosens
+--
+-- This script digs a 1x2 tunnel of a given length
+
+local logger = require("jlib.log").init_logger(3)
+local fuel = require("jlib.fuel")
+fuel.logger = logger
+local move = require("jlib.move").move
+local input = require("jlib.input")
+
+
+local function main(args)
+    -- Get tunnel length
+    local length = tonumber(args[1]) or input.read_int("Tunnel length: ")
+
+    -- Check if fuel is sufficient
+    if not fuel.check(length) then
+        return logger:log(1, "Insufficient fuel.")
+    end
+
+    -- Do the digging
+    move('f', length, { turtle.digDown, turtle.digUp })
+end
+
+
+main({...})