gistfile1.rb

require 'slop'

optspec = <<-SPEC
ruby foo.rb [options]
---
n,name=   Set your name
a,age=    Set your age
v,verbose Enable verbose mode
debug     Enable debug mode
SPEC

opts = Slop.optspec(optspec)
opts.parse

puts opts #=>
# ruby foo.rb [options]
#
# options:
#
#    -n, --name         Set your name
#    -a, --age          Set your age
#    -v, --verbose      Enable verbose mode
#        --debug        Enable debug mode

# ruby foo.rb --name "Lee Jarvis" --debug -a 102
opts.debug?   #=> true
opts[:name]   #=> "Lee Jarvis"
opts[:age]    #=> 102
opts.verbose? #=> false

@alialshahib I found that to be a unique use case, because --options are usually just that, optional. You can handle it pretty easily yourself, though:

raise "You didn't supply the --omg option!" unless opts.omg?

If you want something to do this built into Slop, please open an issue with a suggestion :)