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-;;; maybe.el --- Library for dealing with nil values -*- lexical-binding: t -*-
-
-;; Author: William Carroll <wpcarro@gmail.com>
-;; Version: 0.0.1
-;; Package-Requires: ((emacs "24"))
-
-;;; Commentary:
-;; Inspired by Elm's Maybe library.
-;;
-;; For now, a Nothing value will be defined exclusively as a nil value.  I'm
-;; uninterested in supported falsiness in this module even at risk of going
-;; against the LISP grain.
-;;
-;; I'm avoiding introducing a struct to handle the creation of Just and Nothing
-;; variants of Maybe.  Perhaps this is a mistake in which case this file would
-;; be more aptly named nil.el.  I may change that.  Because of this limitation,
-;; functions in Elm's Maybe library like andThen, which is the monadic bind for
-;; the Maybe type, doesn't have a home here since we cannot compose multiple
-;; Nothing or Just values without a struct or some other construct.
-;;
-;; Possible names for the variants of a Maybe.
-;; None    | Some
-;; Nothing | Something
-;; None    | Just
-;; Nil     | Set
-;;
-;; NOTE: In Elisp, values like '() (i.e. the empty list) are aliases for nil.
-;; What else in Elisp is an alias in this way?
-;; Examples:
-;; TODO: Provide examples of other nil types in Elisp.
-
-;;; Code:
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Dependencies
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(require 'list)
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Constants
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defvar maybe--run-tests? t
-  "When t, run the test suite defined herein.")
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Library
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defun maybe-nil? (x)
-  "Return t if X is nil."
-  (eq nil x))
-
-(defun maybe-some? (x)
-  "Return t when X is non-nil."
-  (not (maybe-nil? x)))
-
-(defun maybe-nils? (&rest xs)
-  "Return t if all XS are nil."
-  (list-all? #'maybe-nil? xs))
-
-(defun maybe-somes? (&rest xs)
-  "Return t if all XS are non-nil."
-  (list-all? #'maybe-some? xs))
-
-(defun maybe-default (default x)
-  "Return DEFAULT when X is nil."
-  (if (maybe-nil? x) default x))
-
-(defun maybe-map (f x)
-  "Apply F to X if X is not nil."
-  (if (maybe-some? x)
-      (funcall f x)
-    x))
-
-(provide 'maybe)
-;;; maybe.el ends here