# Adds support for static files (javascript files, images, stylesheets, etc).
#
# ```
# require "tynn"
# require "tynn/static"
#
# Tynn.helpers(Tynn::Static, ["/js", "/css"])
# ```
#
# By default, serve all requests beginning with the given paths from the folder
# `public` in the current directory (e.g. `public/js/*`, `public/css/*`). You
# can change the default by passing the `:root` option.
#
# ```
# Tynn.helpers(Tynn::Static, ["/js", "/css"], root: "assets")
# ```
#
# Under the hood, it uses the [Rack::Static][rack-static] middleware.
# Thus, supports all the options available for this middleware.
#
# ```
# Tynn.helpers(Tynn::Static, ["/js", "/css"], index: "index.html")
# ```
#
# [rack-static]: http://www.rubydoc.info/gems/rack/Rack/Static
#
module Tynn::Static
  def self.setup(app, urls, options = {}) # :nodoc:
    options = options.dup

    options[:urls] ||= urls
    options[:root] ||= File.expand_path("public", Dir.pwd)

    app.use(Rack::Static, options)
  end
end