feat(wpcarro/emacs): Package vector.el

Paying-off more packaging debt...

Change-Id: Ide641229d6c8efe70c0fd6c625d07aa1a3be98a0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7395
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>

users/wpcarro/emacs/pkgs/vector/vector.el

@@ -0,0 +1,58 @@
+;;; vector.el --- Working with Elisp's Vector data type -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; It might be best to think of Elisp vectors as tuples in languages like
+;; Haskell or Erlang.
+;;
+;; Not surprisingly, this API is modelled after Elixir's Tuple API.
+;;
+;; Some Elisp trivia:
+;; - "Array": Usually means vector or string.
+;; - "Sequence": Usually means list or "array" (see above).
+;;
+;; It might be a good idea to think of Array and Sequence as typeclasses in
+;; Elisp.  This is perhaps more similar to Elixir's notion of the Enum protocol.
+;;
+;; Intentionally not supporting a to-list function, because tuples can contain
+;; heterogenous types whereas lists should contain homogenous types.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun vector-concat (&rest args)
+  "Return a new vector composed of all vectors in `ARGS'."
+  (apply #'vconcat args))
+
+(defun vector-prepend (x xs)
+  "Add `X' to the beginning of `XS'."
+  (vector-concat `[,x] xs))
+
+(defun vector-append (x xs)
+  "Add `X' to the end of `XS'."
+  (vector-concat xs `[,x]))
+
+(defun vector-get (i xs)
+  "Return the value in `XS' at index, `I'."
+  (aref xs i))
+
+(defun vector-set (i v xs)
+  "Set index `I' to value `V' in `XS'.
+Returns a copy of `XS' with the updates."
+  (let ((copy (vconcat [] xs)))
+    (aset copy i v)
+    copy))
+
+(defun vector-set! (i v xs)
+  "Set index `I' to value `V' in `XS'.
+This function mutates XS."
+  (aset xs i v))
+
+(provide 'vector)
+;;; vector.el ends here