support required arguments

[Felix Wong]

if a required argument is not passed in, the program should error.
e.g.

% ruby foo.rb --arg blah
...output...
% ruby foo.rb
required argument --arg not given
%

[Lee Jarvis]

I had this in the previous version and it was never really used. You can add it yourself really easily though:

#!/usr/bin/env ruby

require "slop"

opts = Slop.parse do |o|
  o.string "--name"
end

unless opts.name?
  raise "required --name option not provided"
end

[Felix Wong]

ah, bummer. it would be great to have it built in to the gem.

[NicolasWebDev]

I would second that request, because the support is responsibility of the option parser I think.

[Lee Jarvis]

Fair comment. Would one of you be up for tackling this? I think something like this would work:

Slop.parse do |o|
  o.string "--name", required: true
end

And if --name is not present, we would raise a Slop::MissingRequiredOption or something. WDYT?

[NicolasWebDev]

Hum, let me see if I find the time to implement that then!

It seems to me that what you thought of is the most intuitive solution indeed.