Don't set session

[adam12]

I think setting the session should be done by the user inside the yielded block, using the value yielded from the match in #4, if they want that value to be set in the first place.

r.locale do |locale|
  session[:locale] ||= locale
end

If we assume that a session exists, this plugin can't be used where there is no session - ie. a Roda app that performs mailing only.

class Mailer < Roda
  plugin :mailer
  plugin :i18n

  route do |r|
    r.locale do  
      r.mail "/some-path" {}
    end
  end
end

Mailer.sendmail("/en/some-path")  # FAILS! No Rack::Session available

This is likely a breaking change for anybody relying on this functionality.

[kematzy]

Great catch! Thanks a lot for pull request, and my apologies for not including this PR earlier.