5785a5d126
If you refer to the previous commit where I change shell-command usages to start-process function calls, you'll see the rationale for why I prefer start-process. This commit introduces a more ergonomic API for start-process that fits most of my current use-cases of it. This cleans up the code. I have introduced a bug in the way that I'm tokenizing the COMMAND value. I've tracked that with a TODO. For now it only affects the `xmodmap -e '<command-string>'` calls, which isn't too disruptive.
137 lines
4.8 KiB
EmacsLisp
137 lines
4.8 KiB
EmacsLisp
;;; prelude.el --- My attempt at augmenting Elisp stdlib -*- lexical-binding: t -*-
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;; Author: William Carroll <wpcarro@gmail.com>
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;;; Commentary:
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;; Some of these ideas are scattered across other modules like `fs',
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;; `string-functions', etc. I'd like to keep everything modular. I still don't
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;; have an answer for which items belond in `misc'; I don't want that to become
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;; a dumping grounds. Ideally this file will `require' all other modules and
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;; define just a handful of functions.
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;; TODO: Consider removing all dependencies from prelude.el.
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;;; Code:
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Third-party libraries
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(require 's)
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(require 'dash)
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(require 'f)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Libraries
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; TODO: Maybe don't globally import everything here. Disable these and attepmt
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;; to reload Emacs to assess damage.
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(require 'string)
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(require 'list)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Utilities
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun prelude/to-string (x)
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"Convert X to a string."
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(format "%s" x))
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(defun prelude/inspect (&rest args)
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"Message `ARGS' where ARGS are any type."
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(->> args
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(list/map #'prelude/to-string)
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(apply #'string/concat)
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message))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Assertions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; TODO: Should I `throw' instead of `error' here?
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(defmacro prelude/assert (x)
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"Errors unless X is t.
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These are strict assertions and purposely do not rely on truthiness."
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(let ((as-string (prelude/to-string x)))
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`(unless (equal t ,x)
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(error (string/concat "Assertion failed: " ,as-string)))))
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(defmacro prelude/refute (x)
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"Errors unless X is nil."
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(let ((as-string (prelude/to-string x)))
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`(unless (equal nil ,x)
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(error (string/concat "Refutation failed: " ,as-string)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Adapter functions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun prelude/identity (x)
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"Return X unchanged."
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x)
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(defun prelude/const (x)
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"Return a variadic lambda that will return X."
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(lambda (&rest _) x))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Miscellaneous
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; TODO: Consider packaging these into a linum-color.el package.
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;; TODO: Generate the color used here from the theme.
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(defvar linum/safe? nil
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"Flag indicating whether or not it is safe to work with `linum-mode'.")
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(defvar linum/mru-color nil
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"Stores the color most recently attempted to be applied.")
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(add-hook 'linum-mode-hook
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(lambda ()
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(setq linum/safe? t)
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(when (maybe/some? linum/mru-color)
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(set-face-foreground 'linum linum/mru-color))))
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(defun prelude/set-line-number-color (color)
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"Safely set linum color to `COLOR'.
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If this is called before Emacs initializes, the color will be stored in
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`linum/mru-color' and applied once initialization completes.
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Why is this safe?
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If `(set-face-foreground 'linum)' is called before initialization completes,
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Emacs will silently fail. Without this function, it is easy to introduce
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difficult to troubleshoot bugs in your init files."
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(if linum/safe?
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(set-face-foreground 'linum color)
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(setq linum/mru-color color)))
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(defun prelude/prompt (prompt)
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"Read input from user with PROMPT."
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(read-string prompt))
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;; TODO: Fix the bug with tokenizing here, since it will split any whitespace
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;; character, (even though it shouldn't in the case of quoted string in shell).
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;; e.g. - "xmodmap -e 'one two three'" => '("xmodmap" "-e" "'one two three'")
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(cl-defun prelude/start-process (&key name command)
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"Pass command string, COMMAND, and the function name, NAME.
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This is a wrapper around `start-process' that has an API that resembles
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`shell-command'."
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(let* ((tokens (string/split " " command))
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(program-name (list/head tokens))
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(program-args (list/tail tokens)))
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(apply #'start-process
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`(,(string/format "*%s<%s>*" program-name name)
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,nil
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,program-name
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,@program-args))))
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(defun prelude/executable-exists? (name)
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"Return t if CLI tool NAME exists according to `exec-path'."
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(let ((file (locate-file name exec-path)))
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(if (maybe/some? file)
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(f-exists? file)
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nil)))
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(provide 'prelude)
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;;; prelude.el ends here
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