gistfile1.rb

class MyPlugin
  def self.calculates(name)
    self.calculations << name
  end
  def self.calculations
    @calculations ||= []
  end
  
  def initialize(debug=false)
    @debug = debug
  end
  
  def debug?
    !!@debug
  end
  
  def report
    out = {}
    self.class.calculations.each do |name|
      # e.g. calculate_disk
      results = send("calculate_#{name}")
      out[name] = results
    end
    {:plugins => out }
  end
end

class DiskPlugin < MyPlugin
  calculates :disk
  
  def calculate_disk
    parse_stats_to_hash(command)
  end
  
  private
  
  def command
    if debug?
      return 'zones/eca56d73-3ae9-4264-b8ba-eed1cc90cbb7   61G  3.7G   57G   7% /
            /lib                                        269M  256M   13M  96% /lib
            /lib/svc/manifest                           3.1T  504K  3.1T   1% /lib/svc/manifest
            /lib/svc/manifest/site                       61G  3.7G   57G   7% /lib/svc/manifest/site
            /sbin                                       269M  256M   13M  96% /sbin
            /usr                                        377M  352M   26M  94% /usr
            /usr/ccs                                     61G  3.7G   57G   7% /usr/ccs
            /usr/local                                   61G  3.7G   57G   7% /usr/local
            /usr/lib/libc/libc_hwcap1.so.1              377M  352M   26M  94% /lib/libc.so.1'
    else
      return %x[df -h | sed 1d | awk '{print $1, $5}' | sed 's/%//']
    end
  end
  
  def parse_stats_to_hash(stats)
    stats.split("\n").inject({}) do |hash, line|
      key, value = line.split(' ')
      hash[key.strip.to_sym] = value.to_i
      hash
    end
  end
end

class SomethingElse < MyPlugin
  calculates :memory
  calculates :io
  
  def calculate_io
    {:whatver => "here"}
  end
  
  def calculate_memory
    {:stats_for_memory => 12, :other => "test"}
  end
  
end


def disk(debug=false)
  DiskPlugin.new(debug).report
end

def other(debug=false)
  SomethingElse.new(debug).report
end