loadaverage sleep

loadsleep

#!/usr/bin/env ruby

require "optparse"

opts = ARGV.getopts("", "minutes:5", "load:", "help", "version")

if opts["help"]
  puts <<EOS
loadsleep

Usage:
loadsleep [options] SCREEN_NAME

Options:
-m, --minutes=<minutes>  System load average for the past x minutes [default: 5]
-l, --load=<load>        Load average
-v, --version            Print version and exit
-h, --help               Show this message
EOS
  exit
end

if opts["version"]
  puts "loadsleep 0.1.0"
  exit
end

if opts["load"].nil?
  warn "Error: option '--load' needs a parameter."
  exit
end


input = opts["load"].to_f
minutes = opts["minutes"].to_i

case minutes
when 1, 5, 15
else
  warn "Error: option '--minutes' parameter must be 1, 5, or 15"
  exit
end

loop do
  loadaverages = `uptime`.match(/load average: (.+?), (.+?), (.+?)\Z/).captures.map(&:to_f)
  loadaverage_h = [[1, 5, 15], loadaverages].transpose.to_h
  break if loadaverage_h[minutes] < input
  sleep 5
end