README.md

### Sal Batteryhealth Plugin

This plugin shows a coarse histogram of macbook batteryhealth, calculated by dividing `max_cap` by `design_cap`. To work it needs a custom puppet fact.

### Example fact implementation

```ruby
Facter.add(:mac_macbook_batteryhealth) do
  confine :mac_mobile => ['yes']
  setcode do
    cmd = "ioreg -c AppleSmartBattery -r"
    output = Facter::Core::Execution.execute(cmd).strip
    max_cap = design_cap = 0
    begin
      output.split("\n").each do |line|
        case line
        when /BatteryData/
          next
        when /"DesignCapacity"/
          design_cap = line.split('=')[1].strip.to_f
        when /"MaxCapacity"/
          max_cap = line.split('=')[1].strip.to_f
        else
        end
      end
      health = (100 * max_cap / design_cap).round
      health > 100 ? 100 : health
    rescue
     nil
    end
  end
end
```