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+;; string.el --- Library for working with strings -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Library for working with string.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 's)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Strings
+(defun string/hookify (x)
+  "Append \"-hook\" to X."
+  (s-append "-hook" x))
+
+(defun string/ensure-hookified (x)
+  "Ensure that X has \"-hook\" appended to it."
+  (if (s-ends-with? "-hook" x)
+      x
+    (string/hookify x)))
+
+(defun string/format (x &rest args)
+  "Format template string X with ARGS."
+  (apply #'format (cons x args)))
+
+(defun string/concat (&rest strings)
+  "Joins `STRINGS' into onto string."
+  (apply #'s-concat strings))
+
+(defun string/->symbol (string)
+  "Maps `STRING' to a symbol."
+  (intern string))
+
+(defun string/<-symbol (symbol)
+  "Maps `SYMBOL' into a string."
+  (symbol-name symbol))
+
+(defun string/prepend (prefix x)
+  "Prepend `PREFIX' onto `X'."
+  (s-concat prefix x))
+
+(defun string/append (postfix x)
+  "Appen `POSTFIX' onto `X'."
+  (s-concat x postfix))
+
+(defun string/surround (s x)
+  "Surrounds `X' one each side with `S'."
+  (->> x
+       (string/prepend s)
+       (string/append s)))
+
+;; TODO: Define a macro for defining a function and a test.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Casing
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun string/caps->kebab (x)
+  "Change the casing of `X' from CAP_CASE to kebab-case."
+  (->> x
+       s-downcase
+       (s-replace "_" "-")))
+
+(defun string/kebab->caps (x)
+  "Change the casing of X from CAP_CASE to kebab-case."
+  (->> x
+       s-upcase
+       (s-replace "-" "_")))
+
+(defun string/lower->caps (x)
+  "Change the casing of X from lowercase to CAPS_CASE."
+  (->> x
+       s-upcase
+       (s-replace " " "_")))
+
+(defun string/lower->kebab (x)
+  "Change the casing of `X' from lowercase to kebab-case."
+  (s-replace " " "-" x))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun string/instance? (x)
+  "Return t if X is a string."
+  (stringp x))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support these.
+;; (require 'macros)
+;; (macros/test
+;;  :function string/surround
+;;  :test "works as expected"
+;;  :args '("-*-" "surround")
+;;  :expect "-*-surround-*-"
+;;  :equality string=)
+;
+;; (macros/test
+;;  :function string/caps->kebab
+;;  :test "works as expected"
+;;  :args '("CAPS_CASE_STRING")
+;;  :expect "caps-case-string"
+;;  :equality string=)
+;
+;; ;; TODO: Generate :test from docs of defun.
+;; (macros/test
+;;  :function string/kebab->caps
+;;  :test "works as expected"
+;;  :args '("kebab-case-string")
+;;  :expect "KEBAB_CASE_STRING"
+;;  :equality =)
+
+(provide 'string)
+;;; string.el ends here