;;; 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
