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+;;; macros.el --- Helpful variables for making my ELisp life more enjoyable -*- lexical-binding: t -*-
+;; Authpr: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; This file contains helpful variables that I use in my ELisp development.
+
+;; TODO: Consider a macro solution for mimmicking OCaml's auto resolution of
+;; dependencies using `load-path' and friends.
+
+;;; Code:
+
+(require 'f)
+(require 'string)
+(require 'symbol)
+
+;; TODO: Support `xi' lambda shorthand macro.
+
+(defmacro enable (mode)
+  "Helper for enabling `MODE'.
+Useful in `add-hook' calls.  Some modes, like `linum-mode' need to be called as
+`(linum-mode 1)', so `(add-hook mode #'linum-mode)' won't work."
+  `#'(lambda nil (,mode 1)))
+
+(defmacro disable (mode)
+  "Helper for disabling `MODE'.
+Useful in `add-hook' calls."
+  `#'(lambda nil (,mode -1)))
+
+(defmacro add-hooks (modes callback)
+  "Add multiple `MODES' for the `CALLBACK'.
+Usage: (add-hooks '(one-mode-hook 'two-mode-hook) #'fn)"
+  `(dolist (mode ,modes)
+     (add-hook mode ,callback)))
+
+(defmacro add-hook-before-save (mode f)
+  "Register a hook, `F', for a mode, `MODE' more conveniently.
+Usage: (add-hook-before-save 'reason-mode-hook #'refmt-before-save)"
+  `(add-hook ,mode
+             (lambda ()
+               (add-hook 'before-save-hook ,f))))
+
+;; TODO: Debug.
+(defmacro macros/ilambda (&rest body)
+  "Surrounds `BODY' with an interactive lambda function."
+  `(lambda ()
+     (interactive)
+     ,@body))
+
+;; TODO: Privatize?
+(defun namespace ()
+  "Return the namespace for a function based on the filename."
+  (->> (buffer-file-name)
+       f-filename
+       f-base))
+
+(defmacro macros/comment (&rest _)
+  "Empty comment s-expresion where `BODY' is ignored."
+  `nil)
+
+;; NOTE: Not prepending the "macros" to this macro, since brevity is its goal.
+(defmacro >> (&rest forms)
+  "Compose a new, point-free function by composing FORMS together."
+  (let ((sym (gensym)))
+    `(lambda (,sym)
+       (->> ,sym ,@forms))))
+
+;; TOOD: Support this.
+(cl-defmacro macros/test
+    (&key function
+          test
+          args
+          expect
+          equality)
+  (let* ((namespace (namespace))
+         (test-name (string/->symbol
+                     (s-concat namespace
+                               "/"
+                               "test"
+                               "/"
+                               (s-chop-prefix
+                                (s-concat namespace "/")
+                                (symbol/to-string function))))))
+    `(ert-deftest ,test-name ()
+       ,test
+       (should (,equality (apply ,function ,args)
+                        ,expect)))))
+
+(defmacro macros/support-file-extension (ext mode)
+  "Register MODE to automatically load with files ending with EXT extension.
+Usage: (macros/support-file-extension \".pb\" protobuf-mode)"
+  (let ((extension (string/format "\\.%s\\'" ext)))
+    `(add-to-list 'auto-mode-alist '(,extension . ,mode))))
+
+(provide 'macros)
+;;; macros.el ends here