class Middleman::Sources

def initialize(app, _options={}, watchers=[])
  @app = app
  @watchers = watchers
  @sorted_watchers = @watchers.dup.freeze
  ::Middleman::Sources.file_cache = {}
  # Set of procs wanting to be notified of changes
  @on_change_callbacks = ::Hamster::Vector.empty
  # Global ignores
  @ignores = ::Hamster::Hash.empty
  # Whether we're "running", which means we're in a stable
  # watch state after all initialization and config.
  @running = false
  @update_count = 0
  @last_update_count = -1
  # When the app is about to shut down, stop our watchers.
  @app.before_shutdown(&method(:stop!))
end