Please allow environment variables as default values

[manveru]

It would be nice to have environment variables act as default values.

I tried following:

option "key", :string, "-k", "--key",
  default: ENV["MAPTILER_API_KEY"]?,
  required: true,
  desc: "Set the API key (also via MAPTILER_API_KEY env var)"

But in https://github.com/TheMasterCado/easy-cli/blob/master/src/option/option.cr the @default is unconditionally set to nil because i marked it as required.

Now I can write it like this:

key = ENV["MAPTILER_API_KEY"]?
option "key", :string, "-k", "--key",
  default: key,
  required: key == nil,
  desc: "Set the API key (also via MAPTILER_API_KEY env var)"

But that just doesn't read quite as nice.

[TheMasterCado]

Hi @manveru,
I only use this project for a CLI I'm building at work and did not even see someone posted an issue.

I would like to help you. Let me understand your problem a bit better, you want to have an option for which the default value is set at compile time? And if that value is null ask for it when running the command ?

put into this context, a 'required' option for which you supply a default value could become optional at compile time.