module Piston
  class PistonError < RuntimeError; end
  class UnknownRepository < PistonError
    def initialize(url)
      super "Repository at URL #{url} could not be contacted -- the repository does not seem to exist"
    end
  end

  class LocalChangesPending < PistonError
    def initialize(path)
      super "The working copy rooted at #{path} has pending changes.  Please run 'svn update' before running Piston again"
    end
  end

  class RepositoryUuidChanged < PistonError
    def initialize(url, expected_uuid, actual_uuid)
      super "The repository at #{url} changed UUID from #{expected_uuid} to #{actual_uuid} -- Piston will not update/switch"
    end
  end

  class MissingRepositoryLocation < PistonError
    def initialize(url)
      super "Repository location #{url} does not exist anymore"
    end
  end

  REMOTE_UUID = "piston:remote-uuid"
  REMOTE_ROOT = "piston:remote-root"
  REMOTE_REVISION = "piston:remote-revision"
  LOCAL_REVISION = "piston:local-revision"
  LOCKED = "piston:locked"
end

require 'piston/version'