Ruby OptParse

options.rb

require 'optparse'
require 'ostruct'

class OptParse
    #
    # Return a structure describing the options.
    #
    def self.parse(args)
        # The options specified on the command line will be collected in *options*.
        # We set default values here.
        options = OpenStruct.new
        options.conf_file   = nil
        options.log_file    = nil
        options.debug       = false
        options.verbose     = false
        options.pretend     = false

        opt_parser = OptionParser.new do |opts|
            opts.banner = "Usage: #{File.basename($PROGRAM_NAME)} [options]"

            opts.separator ""
            opts.separator "Specific options:"

            # Config file
            opts.on('-c', '--config FILE', 'Read our configuration items from FILE') do |conf|
                options.conf_file = conf
            end

            # Verbose switch
            opts.on('-v', '--[no-]verbose', 'Run verbosely') do |v|
                options.verbose = v
            end

            opts.separator ""
            opts.separator "Common options:"

            opts.on("-h", "--help", "Show this message") do
                puts version + "\n"
                puts opts
                exit
            end

            opts.on("--version", "Show version") do
                puts version
                exit
            end

            opts.on('--pretend', "Run the program but don't actually start the bots") do
                options.pretend = true
            end

            opts.on('--debug', "Show debugging information during run") do
                options.debug = true
                options.verbose = true
            end

        end

        opt_parser.parse!(args)

        # Set default config file if not provided above
        options.conf_file ||= "#{File.basename($PROGRAM_NAME).gsub('.rb', '.yml')}" 

        options
    end  # parse()

    def self.version
        sprintf "%s - v%s by %s\n", $PROGRAM, $VERSION, $AUTHOR
    end

end  # class OptParse