cl-tutorial.cr

usage = <<-STRING
Usage: cl-tutorial [option]

Command:
    time, --time, -t         show the current time
    help, --help, -h         show this help
    version, --version, -v   show version
STRING

if ARGV.size == 0
  puts usage
else
  case ARGV[0]
  when "time", "--time", "-t"
    puts "The current time is #{Time.now}"
  when "help", "--help", "-h"
    puts usage
  when "version", "--version", "-v"
    puts "CLI Tutorial v0.1.0"
  else
    puts "Unrecognized option"
    puts usage
  end
end