essentials/dotfiles/emacs.d/init.el

;;; init.el -- Emacs initialization file.
;;;
;;; Commentary:
;;;
;;; This file is broken out to be modular.
;;; The following directories are used:
;;;
;;; ~/.emacs.d/elisp       - Contains all customization.
;;; ~/.emacs.d/elisp/modes - Refers to mode specific functions.
;;;
;;; General initialization code, theming, and global settings are stored here for now.
;;; I may move them into a global configuration file later if this gets too crowded
;;; again.

;;--------------------------------------------------------------------------------------
;; Enable MELPA
;;--------------------------------------------------------------------------------------

(require 'package)
(let* ((no-ssl (and (memq system-type '(windows-nt ms-dos))
                    (not (gnutls-available-p))))
       (proto (if no-ssl "http" "https")))
  (when no-ssl
    (warn "\
Your version of Emacs does not support SSL connections,
which is unsafe because it allows man-in-the-middle attacks.
There are two things you can do about this warning:
1. Install an Emacs version that does support SSL and be safe.
2. Remove this warning from your init file so you won't see it again."))
  ;; Comment/uncomment these two lines to enable/disable MELPA and MELPA Stable as desired
  (add-to-list 'package-archives (cons "melpa" (concat proto "://melpa.org/packages/")) t)
  ;;(add-to-list 'package-archives (cons "melpa-stable" (concat proto "://stable.melpa.org/packages/")) t)
  (when (< emacs-major-version 24)
    ;; For important compatibility libraries like cl-lib
    (add-to-list 'package-archives (cons "gnu" (concat proto "://elpa.gnu.org/packages/")))))

(when (< emacs-major-version 27)
  (package-initialize))

(add-to-list 'package-archives
             '("melpa-stable" . "https://stable.melpa.org/packages/") t)

;; This will force any out of date packages to update automatically
(when (not package-archive-contents)
  (package-refresh-contents))

;; Bootstrap use-package if it doesn't exist
(when (not (package-installed-p 'use-package))
  (package-refresh-contents)
  (package-install 'use-package))

(require 'use-package)

(add-to-list 'load-path "~/.emacs.d/elisp")
(add-to-list 'load-path "~/.emacs.d/elisp/modes")

(setq custom-file "~/.emacs.d/elisp/custom.el")
(when (file-exists-p custom-file)
  (load custom-file))


;; Load the package.el file
(load-library "package")

;;--------------------------------------------------------------------------------------
;; Turn off the startup screen
;;--------------------------------------------------------------------------------------

(setq inhibit-startup-screen t)

;;--------------------------------------------------------------------------------------
;; Quit Beeping
;;--------------------------------------------------------------------------------------

(setq visible-bell t)

;; ... and the flashing
(setq ring-bell-function 'ignore)

;;--------------------------------------------------------------------------------------
;; Emacs 27+ Configs
;;--------------------------------------------------------------------------------------

;; Set the directory to the home directory. This has the side effect of making
;; emacs load files from the home directory when called as emacs -nw xyz.
(when (>= emacs-major-version 27)
  (setq default-directory "~/")
  (setq command-line-default-directory "~/"))


;;--------------------------------------------------------------------------------------
;; Display battery life in modeline
;;--------------------------------------------------------------------------------------

(display-battery-mode 1)

;;--------------------------------------------------------------------------------------
;; Set auto-save and backup directory to the temporary file directory in order
;; to keep projects free of annoying backups.
;;--------------------------------------------------------------------------------------
(setq backup-directory-alist
      `((".*" . ,temporary-file-directory)))
(setq auto-save-file-name-transforms
      `((".*" ,temporary-file-directory t)))


;;--------------------------------------------------------------------------------------
;; Always follow symbolic links to version controlled files
;;
;; I prefer this option because I generally only get this message when I edit
;; a dotfile under version control, and repeatedly typing "yes" is annoying.
;;--------------------------------------------------------------------------------------

(setq vc-follow-symlinks t)

;;--------------------------------------------------------------------------------------
;; Enable Org-mode and set agenda files
;;--------------------------------------------------------------------------------------

(require 'org)

;; Stuff all of the org files you want under ~/org and they will be loaded automatically
;; and have their TODO items accessible by typing C-c a t
(setq org-agenda-files '("~/org"))
(setq org-log-done t)

;;--------------------------------------------------------------------------------------
;; Prefer unix style line endings
;;--------------------------------------------------------------------------------------

(set-buffer-file-coding-system 'unix)

;;--------------------------------------------------------------------------------------
;; Populate emacs path to $PATH when on *nix or OS X
;;--------------------------------------------------------------------------------------

(when (memq window-system '(mac ns x))
  (exec-path-from-shell-initialize))

;;--------------------------------------------------------------------------------------
;; Enable auto-refresh to keep buffers up to date when git or another program
;; modifies them
;;--------------------------------------------------------------------------------------

(global-auto-revert-mode t)


(load-library "ibuffer-settings.el")

;;--------------------------------------------------------------------------------------
;; Modes
;;--------------------------------------------------------------------------------------

(require 'use-package)

(load-library "default-modes")
(load-library "lisp-mode-settings")
(load-library "python-mode-settings")
(load-library "ruby-mode-settings")
(load-library "c-mode-settings")


;;--------------------------------------------------------------------------------------
;; Save hooks
;;--------------------------------------------------------------------------------------

(add-hook 'before-save-hook 'delete-trailing-whitespace)


;;--------------------------------------------------------------------------------------
;; Keybinds
;;--------------------------------------------------------------------------------------

(load-library "keybinds")

;;--------------------------------------------------------------------------------------
;; Theming
;;--------------------------------------------------------------------------------------

(load-theme 'arjen-grey t)