module Sprockets::PathUtils

Returns String filename or nil.

root - String path to stop at (default: system root)
path - String path to start search: "app/assets/javascripts/app.js"
basename - String filename: ".sprocketsrc"

Internal: Find target basename checking upwards from path.

def find_upwards(basename, path, root = nil)
  path_parents(path, root).each do |dir|
    filename = File.join(dir, basename)
    return filename if file?(filename)
  end
  nil
end