minecraft recipe cost calculator

cost.rb

#!/usr/bin/env ruby

require 'pp'

RECIPES = {
  :excavator => [{
    :steel_block => 21,
    :steel_scaffolding => 23,
    :light_engineering_block => 9,
    :heavy_engineering_block => 13
    }, 1],
  :steel_block => [{
    :steel => 9
    }, 1],
  :steel_scaffolding => [{
    :steel => 3,
    :steel_fence => 6
    }, 6],
  :steel_fence => [{
    :steel => 6
    }, 16],
  :light_engineering_block => [{
    :iron => 4,
    :copper => 3,
    :iron_mechanical_component => 2
    }, 2],
  :iron_mechanical_component => [{
    :iron => 4,
    :copper => 1
    }, 1],
  :heavy_engineering_block => [{
    :steel => 4,
    :piston => 2,
    :steel_mechanical_component => 2,
    :electrum => 1
    }, 2],
  :piston => [{
    :cobble => 4,
    :wood => 3,
    :iron => 1,
    :redstone => 1
    }, 1],
  :steel_mechanical_component => [{
    :steel => 4,
    :copper => 1
    }, 1],
  :electrum => [{
    :silver => 1,
    :gold => 1
    }, 1],
  :steel => [{
    :iron => 1,
    :coke => 1
    }, 1]
}

def cost(recipe, amount = 1)
  return nil unless RECIPES.has_key? recipe

  total = Hash.new

  multiplier = RECIPES[recipe][1]

  RECIPES[recipe][0].each do |ingredient, quantity|
    ingredient_cost = cost(ingredient, quantity)
    if ingredient_cost.nil?
      amt = (1.0 * amount / multiplier).ceil * quantity
      if total.has_key? ingredient
        total[ingredient] += amt
      else
        total[ingredient] = amt
      end
    elsif ingredient_cost.is_a? Hash
      ingredient_cost.each do |sub_ingredient, sub_quantity|
        sub_amt = (1.0 * amount / multiplier).ceil * sub_quantity
        if total.has_key? sub_ingredient
          total[sub_ingredient] += sub_amt
        else
          total[sub_ingredient] = sub_amt
        end
      end
    else
      puts "huh?"
    end
  end

  return total
end

def print_cost(recipe, amount = 1)
  puts "** #{recipe} x #{amount} **"
  pp cost(recipe,amount)
end

recipe = ARGV[0]
amount = ARGV[1]

if recipe.nil?
  puts "Syntax: cost.rb <recipe> [<amount>]"
elsif recipe == "list"
  puts "Known recipes:"
  RECIPES.sort.each do |k,v|
    puts "  #{k}"
  end
else
  if amount.nil?
    amount = 1
  else
    amount = amount.to_i
  end
  print_cost recipe.to_sym, amount
end

usage

alauritzen@alauritzen-mpb:~$ ./cost.rb list
Known recipes:
  electrum
  excavator
  heavy_engineering_block
  iron_mechanical_component
  light_engineering_block
  piston
  steel
  steel_block
  steel_fence
  steel_mechanical_component
  steel_scaffolding

alauritzen@alauritzen-mpb:~$ ./cost.rb steel
** steel x 1 **
{:iron=>1, :coke=>1}

alauritzen@alauritzen-mpb:~$ ./cost.rb steel_block
** steel_block x 1 **
{:iron=>9, :coke=>9}

alauritzen@alauritzen-mpb:~$ ./cost.rb piston 2
** piston x 2 **
{:cobble=>8, :wood=>6, :iron=>2, :redstone=>2}

alauritzen@alauritzen-mpb:~$ ./cost.rb excavator
** excavator x 1 **
{:iron=>383,
 :coke=>309,
 :copper=>39,
 :cobble=>56,
 :wood=>42,
 :redstone=>14,
 :silver=>7,
 :gold=>7}