# Adds extra matchers to Tynn.
#
# ```
# require "tynn"
# require "tynn/matchers"
#
# Tynn.helpers(Tynn::Matchers)
# ```
#
module Tynn::Matchers
  # A catch-all matcher.
  #
  # ```
  # Tynn.define do
  #   authenticated? do
  #     # ...
  #   end
  #
  #   default do # on true
  #     # ...
  #   end
  # end
  # ```
  #
  # :call-seq: default(&block)
  #
  def default
    yield

    halt(res.finish)
  end

  # Match if the given `key` is present in `req.params`.
  #
  # ```
  # Tynn.define do
  #   param(:user) do |params|
  #     user = User.create(params)
  #
  #     # ...
  #   end
  #
  #   default do
  #     res.write("missing param")
  #   end
  # end
  # ```
  #
  # :call-seq: param(key, &block)
  #
  def param(key)
    if (v = req[key]) && !v.empty?
      yield(v)

      halt(res.finish)
    end
  end
end