#!/usr/bin/env ruby
#
# This is a near-minimal ruby script to demonstrate trollop, a simple
# and elegant command-line parsing package. To run, copy this file to
# 'trollop_demo.rb' and make it executable by
# $ chmod +x trollop_demo.rb
# Then run it via:
# $ ./trollop_demo.rb <your args here>
# For more info on Trollop, see http://trollop.rubyforge.org/
require 'trollop'
# A trivial program...
def main_method(filename, options)
puts("filename = #{filename}, options = #{options}")
end
# Execute this part when the file is run as a script
if __FILE__ == $0
opts = Trollop::options do
version "#{$0} Version 3.14159 (C) 2041 Spacely Sprockets, Inc."
banner <<-EOS
#{$0} is a command-line program to demonstrate trollop
Usage:
#{$0} [options] <filename>
where [options] are zero or more of:
EOS
opt :verbose, "Print extra information."
opt :dry_run, "Don't actually do anything.", :short => "-n"
end
filename = ARGV.shift
if (filename.nil?) || (!File.exist?(filename))
Trollop::die "filename must be given and name an existing file"
else
main_method(filename, opts)
end
end