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-rw-r--r--configs/shared/.emacs.d/wpc/tuple.el86
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diff --git a/configs/shared/.emacs.d/wpc/tuple.el b/configs/shared/.emacs.d/wpc/tuple.el
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--- a/configs/shared/.emacs.d/wpc/tuple.el
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-;;; tuple.el --- Tuple API for Elisp -*- lexical-binding: t -*-
-;; Author: William Carroll <wpcarro@gmail.com>
-
-;;; Commentary:
-;; Work with cons cells with two elements with a familiar API for those who have
-;; worked with tuples before.
-
-;;; Code:
-
-(cl-defstruct tuple first second)
-
-;; Create
-(defun tuple/new ()
-  "Return an empty tuple."
-  (make-tuple :first nil
-              :second nil))
-
-(defun tuple/from (a b)
-  "Return a new tuple from A and B."
-  (make-tuple :first a
-              :second b))
-
-(defun tuple/from-dotted (dp)
-  "Convert dotted pair, DP, into a tuple."
-  (tuple/from (car dp) (cdr dp)))
-
-;; Read
-(defun tuple/first (pair)
-  "Return the first element of PAIR."
-  (tuple-first pair))
-
-(defun tuple/second (pair)
-  "Return the second element of PAIR."
-  (tuple-second pair))
-
-;; Update
-(defun tuple/map-each (f g pair)
-  "Apply F to first, G to second in PAIR."
-  (->> pair
-       (tuple/map-first f)
-       (tuple/map-second g)))
-
-(defun tuple/map (f pair)
-  "Apply F to PAIR."
-  (let ((pair-copy (copy-tuple pair)))
-    (funcall f pair-copy)))
-
-(defun tuple/map-first (f pair)
-  "Apply function F to the first element of PAIR."
-  (let ((pair-copy (copy-tuple pair)))
-    (setf (tuple-first pair-copy) (funcall f (tuple/first pair-copy)))
-    pair-copy))
-
-(defun tuple/map-second (f pair)
-  "Apply function F to the second element of PAIR."
-  (let ((pair-copy (copy-tuple pair)))
-    (setf (tuple-second pair-copy) (funcall f (tuple/second pair-copy)))
-    pair-copy))
-
-(defun tuple/set-first (a pair)
-  "Return a new tuple with the first element set as A in PAIR."
-  (tuple/map-first (lambda (_) a) pair))
-
-(defun tuple/set-second (b pair)
-  "Return a new tuple with the second element set as B in PAIR."
-  (tuple/map-second (lambda (_) b) pair))
-
-;; Delete
-(defun tuple/delete-first (pair)
-  "Return PAIR with the first element set to nil."
-  (tuple/set-first nil pair))
-
-(defun tuple/delete-second (pair)
-  "Return PAIR with the second element set to nil."
-  (tuple/set-second nil pair))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Predicates
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defun tuple/instance? (x)
-  "Return t if X is a tuple."
-  (tuple-p x))
-
-(provide 'tuple)
-;;; tuple.el ends here