Optional dependencies workflow about daru-io HOT 2 CLOSED

From my perspective:

1. All libraries that are required only at a moment of usage (not requiring corresponding file).
2. Not included as a runtime deps of gem
3. Described with a nice DSL, like this:

module Daru
  module Importers
    class CSV < Base
       required_gem 'smartcsv', '~> 2.5'
       optional_gem 'fastcsv', '~> 3'

from daru-io.

I like the idea of being able to install dependencies in one go. You can have groups for individual wrappers and another one where all of them are installed together.

However, users will be using gem install to install the library so the options that a user passes must work with that.

from daru-io.