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|
;;; prelude.el --- My attempt at augmenting Elisp stdlib -*- lexical-binding: t -*-
;; Author: William Carroll <wpcarro@gmail.com>
;;; Commentary:
;; Some of these ideas are scattered across other modules like `fs',
;; `string-functions', etc. I'd like to keep everything modular. I still don't
;; have an answer for which items belond in `misc'; I don't want that to become
;; a dumping grounds. Ideally this file will `require' all other modules and
;; define just a handful of functions.
;; TODO: Consider removing all dependencies from prelude.el.
;;; Code:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Third-party libraries
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require 's)
(require 'dash)
(require 'f)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Libraries
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; TODO: Maybe don't globally import everything here. Disable these and attepmt
;; to reload Emacs to assess damage.
(require 'string)
(require 'list)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Utilities
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun prelude/to-string (x)
"Convert X to a string."
(format "%s" x))
(defun prelude/inspect (&rest args)
"Message `ARGS' where ARGS are any type."
(->> args
(list/map #'prelude/to-string)
(apply #'string/concat)
message))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Assertions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; TODO: Should I `throw' instead of `error' here?
(defmacro prelude/assert (x)
"Errors unless X is t.
These are strict assertions and purposely do not rely on truthiness."
(let ((as-string (prelude/to-string x)))
`(unless (equal t ,x)
(error (string/concat "Assertion failed: " ,as-string)))))
(defmacro prelude/refute (x)
"Errors unless X is nil."
(let ((as-string (prelude/to-string x)))
`(unless (equal nil ,x)
(error (string/concat "Refutation failed: " ,as-string)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Adapter functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun prelude/identity (x)
"Return X unchanged."
x)
(defun prelude/const (x)
"Return a variadic lambda that will return X."
(lambda (&rest _) x))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Miscellaneous
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; TODO: Consider packaging these into a linum-color.el package.
;; TODO: Generate the color used here from the theme.
(defvar linum/safe? nil
"Flag indicating whether or not it is safe to work with `linum-mode'.")
(defvar linum/mru-color nil
"Stores the color most recently attempted to be applied.")
(add-hook 'linum-mode-hook
(lambda ()
(setq linum/safe? t)
(when (maybe/some? linum/mru-color)
(set-face-foreground 'linum linum/mru-color))))
(defun prelude/set-line-number-color (color)
"Safely set linum color to `COLOR'.
If this is called before Emacs initializes, the color will be stored in
`linum/mru-color' and applied once initialization completes.
Why is this safe?
If `(set-face-foreground 'linum)' is called before initialization completes,
Emacs will silently fail. Without this function, it is easy to introduce
difficult to troubleshoot bugs in your init files."
(if linum/safe?
(set-face-foreground 'linum color)
(setq linum/mru-color color)))
(defun prelude/prompt (prompt)
"Read input from user with PROMPT."
(read-string prompt))
;; TODO: Fix the bug with tokenizing here, since it will split any whitespace
;; character, (even though it shouldn't in the case of quoted string in shell).
;; e.g. - "xmodmap -e 'one two three'" => '("xmodmap" "-e" "'one two three'")
(cl-defun prelude/start-process (&key name command)
"Pass command string, COMMAND, and the function name, NAME.
This is a wrapper around `start-process' that has an API that resembles
`shell-command'."
(let* ((tokens (string/split " " command))
(program-name (list/head tokens))
(program-args (list/tail tokens)))
(apply #'start-process
`(,(string/format "*%s<%s>*" program-name name)
,nil
,program-name
,@program-args))))
(defun prelude/executable-exists? (name)
"Return t if CLI tool NAME exists according to `exec-path'."
(let ((file (locate-file name exec-path)))
(if (maybe/some? file)
(f-exists? file)
nil)))
(provide 'prelude)
;;; prelude.el ends here
|
