Play around with dry matchers

matchers.rb

require 'dry-matcher'

success_case = Dry::Matcher::Case.new(
  match: -> value { value.first == :ok },
  resolve: -> value { value.last }
)

failure_case = Dry::Matcher::Case.new(
  match: -> value, *pattern {
    value[0] == :err && (pattern.any? ? pattern.include?(value[1]) : true)
  },
  resolve: -> value { value.last }
)

matcher = Dry::Matcher.new(success: success_case, failure: failure_case)

validate = -> value {
  matcher.(value) do |m|
    m.success do |v|
      "Yay: #{v}"
    end

    m.failure :not_found do |v|
      "Oops, not found: #{v}"
    end

    m.failure do |v|
      "Boo: #{v}"
    end
  end
}

p validate.([:ok, 'success'])
p validate.([:err, :not_found, 'missing!'])
p validate.([:err, 'bad!'])