Platformer

-- Platformer.lua
-- A customizable platform builder

-- Author: Austin Holbrook
-- pastebin get hcWhNJZM platformer

local CONFIG_FILE = '/etc/platformer.conf'

local args = {...}
local length = tonumber(args[1])
local width = tonumber(args[2]) or length
local height = tonumber(args[3]) or 1

function table.contains(t, v)
  for _,data in pairs(t) do
    if data == v then
      return true
    end
  end
  return false
end

function showUsage()
  print("Usage:")
  print("  platformer LENGTH [WIDTH] [HEIGHT]")
  print()
  print("Build a platform that is LENGTH by")
  print("WIDTH using any materials in the")
  print("turtle's inventory. If WIDTH is omitted")
  print("the value of LENGTH is used. If height")
  print("is omitted, 1 is assumed.")
end

function conservativeRefuel()
  for i=1,16 do
    if turtle.getItemCount(i) ~= 0 then
      if table.contains(conf['fuelname'], turtle.getItemDetail(i)['name']) then
        turtle.select(i)
        while turtle.getFuelLevel() < tonumber(conf['lowfuel']) do
          turtle.refuel(1)
          if turtle.getItemCount() == 0 then
            break
          end
        end
      end
    end
  end
end

function nextNonFuel()
  for i=1,16 do
    if turtle.getItemCount(i) ~= 0 then
      if not table.contains(conf['fuelname'], turtle.getItemDetail(i)['name']) then
        return i
      end
    end
  end
  return nil
end

function loadConfig()
  local conf = {}
  if fs.exists(CONFIG_FILE) then
    local file = io.open(CONFIG_FILE, 'r')

    for line in file:lines() do
      line = line:match('%s*(.+)')
      if line and line:sub(1, 1) ~= '#' and line:sub(1, 1) ~= ";" then
        local option = line:match('%S+'):lower()
        local value = line:match('%S*%s*(.*)')

        if not value then
          conf[option] = true --If no value provided, it's a boolean
        else
          if not value:find(',') then
            conf[option] = value
          else
            value = value .. ','
            conf[option] = {}
            for entry in value:gmatch('%s*(.-),') do
              conf[option][#conf[option]+1] = entry
            end
          end
        end
      end
    end
    file:close()

    return conf

  else
    local time = textutils.formatTime( os.time(), false )
    local date = os.day()
    local file = fs.open(CONFIG_FILE, 'w')
    file.writeLine(
[[## Config for platformer.lua
## Generated at ]] .. time .. ' on Day ' .. date .. '\n' .. [[

# List of item names the turtle
# considers fuel
FUELNAME minecraft:coal, minecraft:coal_block

# What should the turtle consider low
# fuel? 1 fuel is 1 movement.
LOWFUEL 100

# Print debug output?
; DEBUG
]]
    )
    file.close()
    return loadConfig()
  end
end

conf = loadConfig()

if conf['debug'] then
  print('FUELNAME:')
  for _, entry in pairs(conf['fuelname']) do
    print('  ' .. entry)
  end
  print('LOWFUEL: ' .. conf['lowfuel'])
end

if type(length) ~= 'number' or type(width) ~= 'number' or type(height) ~= 'number' then
  showUsage()
  error()
end

local normal = 1
for h=1,height do
  for i=1,width do
    for j=1,length do
      if turtle.getFuelLevel() < tonumber(conf['lowfuel']) then conservativeRefuel() end
      if turtle.getItemCount() == 0 or table.contains(conf['fuelname'], turtle.getItemDetail()['name']) then
        turtle.select(nextNonFuel())
      end
      turtle.placeDown()
      if j ~= length then
        turtle.forward()
      end
    end
    if i % 2 == normal then
      turtle.turnRight()
      if i ~= width then
        turtle.forward()
      end
      turtle.turnRight()
    else
      turtle.turnLeft()
      if i ~= width then
        turtle.forward()
      end
      turtle.turnLeft()
    end
  end
  if h ~= height then
    if width % 2 == 0 and h % 2 == 1 then normal = 0
    else normal = 1
    end
    turtle.up()
  end
end