Created
April 4, 2013 04:29
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Determine if the screen is currently in power saving mode on OS X. This will probably break sometime after 10.8.
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| # Get the possible max power state and current power states for the device. | |
| # If they all match (i.e. the current state is the same as the max state), | |
| # then the screen is assumed to be on. | |
| power_management = `ioreg -n IODisplayWrangler |grep -i IOPowerManagement` | |
| power_states = power_management.scan(/(?:"\w+PowerState"=(\d))+/) | |
| abort "Not enough power states!" if power_states.size < 2 | |
| screen_on = power_states.uniq.size == 1 |
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