Find out what is keeping your Mac display on

whyunosleep.rb

#!/usr/bin/env ruby
assertions = {}
lines = `pmset -g assertions`.lines.map {|line| line.chomp }
lines.each do |line|
  #    pid 329(Slack): [0x00004c1d00058b13] 24:48:54 NoDisplaySleepAssertion named: "Electron"
  if line =~ /pid (\d+)\((.*)\): \[.*\] (\d+:\d+:\d+) (\w+) named: \"(.*)\"/
    pid = $1.to_i
    application = $2
    date = $3
    assertion_type = $4
    name = $5
    # binding.pry
    assertions[assertion_type] ||= []
    assertions[assertion_type] << {
      pid: pid,
      application: application,
      date: date,
      name: name
    }
  end
end

count = (assertions["NoDisplaySleepAssertion"] || []).size
if count > 0
  puts "ugh, of course it's #{count == 1 ? 'this' : 'these'} joker#{'s' if count > 1}:"
  assertions["NoDisplaySleepAssertion"].each do |process|
    puts "#{process[:application]} (#{process[:pid]})"
  end
else
  puts "Dunno, seems like I can sleep"
end