to help Ragesh

ragesh.rb

require 'rufus-scheduler'

SCHEDULER = Rufus::Scheduler.new
  # in this example, the scheduler is placed in a "global constant"

def help

  puts
  puts "in {interval} \"message\"       ~~> print message after {interval}"
  puts "every {interval} \"message\"    ~~> print message every {interval}"
  puts "cron {cron string} \"message\"  ~~> print message along {cron string}"
  puts
  puts "unschedule {job id}             ~~> unschedule job"
  puts
  puts "exit                            ~~> leave this shell"
  puts
end

def schedule(cmd, tim, msg)

  SCHEDULER.send(cmd, tim) do |job|
    now = Time.now
    now = "#{now.strftime('%Y-%m-%d %H:%M:%S')}.#{sprintf('%06d', now.usec)}"
    $stdout.puts("#{now} : #{msg.inspect} : (#{job.id})"); $stdout.flush
  end
end

def unschedule(_, job_id, _)

  SCHEDULER.unschedule(job_id)
  nil
end

loop do

  print "rufus-scheduler-shell> "

  t = $stdin.gets; break unless t
  t = t.strip

  if t == 'exit'; break; end
  if t == 'help'; help; next; end
  if t == ''; next; end

  m = t.match(/\A([^\s]+)\s+([^"]+)(?:\s*"([^"]+))?/)
  cmd, tim, msg = m ? m[1, 3] : nil
  tim = tim.strip if tim
  msg = msg.strip if msg

  if cmd == nil; puts "invalid command, try \"help\""; next; end

  mth =
    case cmd
    when 'in', 'every', 'cron' then 'schedule'
    else cmd
    end

  begin
    job_id = send(mth, cmd, tim, msg)
    puts "  --> job id: #{job_id}" if job_id
  rescue NoMethodError
    puts "invalid command #{cmd.inspect}, try \"help\""
  end
end