Check WOL and caffeinate

check_wake.rb

#!/usr/bin/ruby
# coding: utf-8

filepath="/var/log/system.log"
fpointer = 0
f = open(filepath)
f.seek(0, IO::SEEK_END)
fpointer = f.pos

while true

  l = f.gets
  fpointer = f.pos
  
  if l
    # puts l
    if /Wake reason: GIGE/ =~ l
      puts "[ruby] GIGE"
      system("caffeinate -u sh -c \"\"")
      break
    elsif /full wake/ =~ l
      puts "[ruby] full wake"
      break
    end

  else
    f.close unless f.closed?
    closetime = File.mtime(filepath)
    while (File.mtime(filepath) == closetime)
      sleep 1
    end
    f = open(filepath)
    f.seek(fpointer, IO::SEEK_SET)
  end
  
end