server_map_converter.rb

module Golem
  class ServerMapConverter
    def self.convert(src_path, dest_path)
      new(src_path, dest_path).convert
    end

    attr_reader :src, :dest

    def initialize(src_path, dest_path)
      @src = Pathname.new(src_path).expand_path
      @dest = Pathname.new(dest_path).expand_path
    end

    def convert
      Dir.chdir(dest) do
        each_chunk_file do |file|
          # next unless file.basename.to_s == "c.0.0.dat"
          dump_converted file
        end
      end
    end

    def dump_converted(file)
      data = NBTParser.parse(File.read(file))
      level = data[""]["Level"]
      # ["Data", "Entities", "LastUpdate", "xPos", "zPos", "TileEntities", "TerrainPopulated", "SkyLight", "HeightMap", "BlockLight", "Blocks"]
      # puts level["Blocks"].size
      # puts level["BlockLight"].size
      # puts level["SkyLight"].size
      x = level["xPos"]
      z = level["zPos"]
      fn = "#{x}.#{z}.blocks"
      puts "writing #{fn}"
      File.open(fn, "w") do |f|
        f.puts level["Blocks"].pack("C*")
      end
    end

    def each_chunk_file
      src.each_child do |top|
        next unless top.directory?
        top.each_child do |sub|
          next unless sub.directory?
          sub.each_child do |file|
            next unless file.basename.to_s =~ /\.dat$/
              yield file
          end
        end
      end
    end

  end
end