dirlist

type List interface {
	// Reset resets the list of directories to an empty slice.
	Reset()

	// Contains returns true if the list contains the path.
	Contains(string) bool

	// Load reads the list of directories from a string.
	Load(string)

	// LoadEnv parses the value of an environment variable. It expects
	// the value to be a string of directories separates by the rune
	// filepath.ListSeparator.
	LoadEnv(string)

	// Prepend the list with a path.
	Prepend(string)

	// Append a path to the list.
	Append(string)

	// Drop remove a path from the list.
	Drop(string)

	// Slice returns the path list as a slice of strings.
	Slice() []string

	// String returns the path list as a string of path list
	// separator-separated directories.
	String() string
}