My .emacs configuration

.emacs

;;; .emacs --- Personal Emacs configuration -*- lexical-binding: t; -*-

;; Opinionated defaults: no tabs, visible whitespace, centralized backups,
;; and a handy C-c c binding to toggle comments on region or line.

;; Highlights dumb stuff.
(require 'whitespace)
(setq whitespace-style '(face empty tabs lines-tail trailing))
(global-whitespace-mode t)

;; 80 column marker.
(
  add-hook 'rust-mode-hook (
    lambda ()
    (setq-local whitespace-line-column 80)
  )
)

;; No tabs! Ever!
(setq-default indent-tabs-mode nil)

;; Save all backups to ~/.emacs_backups.
(setq make-backup-files t)
(
  setq backup-directory-alist (
    quote (
      (\".\" . \"~/.emacs_backups\")
    )
  )
)
(setq backup-by-copying t)
(
  setq delete-old-versions t
  kept-new-versions 2
  kept-old-versions 2
  version-control t
)

;; Show current line and column numbers in the mode line.
(line-number-mode 1)
(column-number-mode 1)

;; Comment binding.
;; Hit Ctrl + C, C to comment or uncomment the selected region. If no region is
;; selected, it will comment/uncomment the current line.
(
  defun comment-or-uncomment-region-or-line ()
  \"Comments or uncomments the region or the current line if there's no active region\"
  (interactive)
  (let (beg end)
    (if (region-active-p)
      (setq beg (region-beginning) end (region-end))
      (setq beg (line-beginning-position) end (line-end-position))
    )
    (comment-or-uncomment-region beg end)
  )
)
(global-set-key (kbd \"C-c c\") 'comment-or-uncomment-region-or-line)