Method: #parse_ARGV

Defined in:
lib/easel.rb

#parse_ARGV ⇒ Object

parse_ARGV

Parses the command line arguments (ARGV) using the optparse gem. Optional command line arguments can be seen by running this program with the -h (or –help) flag.



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# File 'lib/easel.rb', line 43

def parse_ARGV
  opt_parser = OptionParser.new do |opts|
    opts.banner = "Useage: launch.rb [flags] configuration.yaml"

    opts.on("-h", "--help", "Prints this help message.") do
      puts opts
      exit
    end

    opts.on("-l LOG_LEVEL", "--log LOG_LEVEL", Integer, "Sets the logging level (default=2). 0=Silent, 1=Errors, 2=Warnings, 3=Info.") do |lvl|
      if [0, 1, 2, 3].include?(lvl)
        $config[:logging] = lvl
      else
        log_fatal "Command argument LOG_LEVEL '#{lvl}' not recognized. Expected 0, 1, 2, or 3."
      end
    end

    opts.on("-p PORT", "--port PORT", Integer, "Sets the port to bind to. Default is #{$config[:port]}.") do |port|
      if port >= 0 and port <= 65535
        $config[:port] = port
      else
        log_fatal "Command argument PORT '#{port}' not a valid port. Must be between 0 and 65535 (inclusive)"
      end
    end

    opts.on("-h HOST", "--hostname HOST",  "Sets the hostname. Default is '#{$config[:hostname]}'.") do |port|
      if port >= 0 and port <= 65535
        $config[:port] = port
      else
        log_fatal "Command argument PORT '#{port}' not a valid port. Must be between 0 and 65535 (inclusive)"
      end
    end

    opts.on("-o [FILE]", "--output [FILE]",  "Set a log file.") do |filename|
      begin
        $config[:log_file] = File.new(filename, "a")
      rescue Exception => e
        log_error "Log file could not be open. Sending log to STDIN. Error message: #{e}"
      end
    end
  end.parse!

  if ARGV.length != 1
    log_fatal "launch.rb takes exactly one file. Try -h for more details."
  else
    $config[:yaml_file] = ARGV[0]
  end
end