Get a breakdown of WiFi utilization by relative signal strength. Assumes wireless interface accessible at "wlan0".

PLAYDOUGH_SIGNALS.rb

#!/usr/bin/env ruby
require 'json'
wifi = `iwlist wlan0 scan`
pieces2ghz = wifi.split("Cell ")[1..-1].select{|x| x.include?('Signal level=')}

data = pieces2ghz.map{ |x| [(x.split('Signal level=')[1].split('/')[0] rescue '0').to_i ]}

signals = { :'Very Weak' => 0, :Poor => 0, :Fair => 0, :Strong => 0 }
signals = data.reduce(signals) do |signals, x|
   if(x[0] > 70)
      type = :Strong
   elsif(x[0] > 50)
      type = :Fair
   elsif(x[0] > 20)
      type = :Poor
   else
      type = :'Very Weak'
   end
   signals[type] += 1
   signals
end

puts signals.to_json.gsub(/"/, "'")