module GitMeta

  VERSION = "2.0.0"

  class Scanner

    attr_accessor :info

    REGEX = /(\S+):\s*(.+)$/

    def initialize(text)
      self.info = Hash.new("")
      text.scan(REGEX) do |k,v|
        self.info[k] = v
      end
    end

    def ==(comrade)
      info == comrade.info
    end

  end

  class Hash < ::Hash

    def to_s
      inject("") do |result, hash|
        result += "#{hash[0]}: #{hash[1]}\n"
        # hash is an array of schema [key, value]
      end
    end

  end

  class Get
    attr_accessor :scanner, :key
    def initialize(sha, key=nil)
      output = IO.popen("git-cat-file -p #{sha}", 'r') do |git_cat_file|
        git_cat_file.read
      end
      self.scanner = Scanner.new(output)
      self.key = key
    end

    def to_s
      key ? @scanner.info[key] : @scanner.info.to_s
    end

  end

end