Add some whitespace settings

emacs/.emacs.d/init.el

@@ -167,6 +167,21 @@ This is currently the data directory under the
 ;; whereabouts I am, so they just take up space.
 (scroll-bar-mode -1)
 
+;;;; Whitespace:
+;; I hate it when trailing whitespace is left around a file. I've been
+;; using this for years, and apart from having some trouble working
+;; with people who don't pay attention to it, it has worked
+;; flawlessly.
+(ensure-library destroy-trailing-whitespace
+  :path "vendor-lisp/destroy-trailing-whitespace")
+(require 'destroy-trailing-whitespace)
+(global-destroy-trailing-whitespace-mode)
+
+;; Having a final newline at the end of the file is always a good
+;; idea. Some programs just don't work without it and others produce
+;; some strange results. Github diffs are an example.
+(setq require-final-newline t)
+
 ;;;; Minor modes:
 
 ;;;;; Paredit:

emacs/.emacs.d/vendor-lisp/destroy-trailing-whitespace/destroy-trailing-whitespace.el

@@ -0,0 +1,66 @@
+;;; destroy-trailing-whitespace.el --- Destroy all trailing whitespace  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016  Tom Willemse
+
+;; Author: Tom Willemse <chelys@drd>
+;; Keywords: convenience
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This library offers a single mode that will delete all trailing
+;; whitespace before saving any file. It tries to be intelligent
+;; enough to only do this for modes where trailing whitespace is not
+;; meaningful. Currently it only keeps whitespace around in
+;; `markdown-mode' since it uses two spaces at the end of a line to
+;; signify a line break.
+;;
+;; To use this mode in all buffers, add the following to your init
+;; file:
+;;
+;;    (require 'destroy-trailing-whitespace)
+;;    (global-destroy-trailing-whitespace-mode)
+;;
+;; To use this mode in just some buffers add it to your preferred
+;; hook. For example, to use it only in `prog-mode' buffers:
+;;
+;;    (require 'destroy-trailing-whitespace)
+;;    (add-hook 'prog-mode-hook 'destroy-trailing-whitespace-mode)
+
+;;; Code:
+
+(defun destroy-trailing-whitespace ()
+  "Delete trailing whitespace everywhere, except in Markdown buffers."
+  (if (not (eq major-mode 'markdown-mode))
+      (delete-trailing-whitespace)))
+
+;;;###autoload
+(define-minor-mode destroy-trailing-whitespace-mode
+  "Destroy all trailing whitespace before saving the buffer."
+  :lighter ""
+  (if destroy-trailing-whitespace-mode
+      (add-hook 'before-save-hook 'delete-trailing-whitespace nil :local)
+    (remove-hook 'before-save-hook 'delete-trailing-whitespace :local)))
+
+;;;###autoload
+(define-minor-mode global-destroy-trailing-whitespace-mode
+  "Destroy all trailing whitespace before saving any open buffer."
+  :lighter "" :global t
+  (if global-destroy-trailing-whitespace-mode
+      (add-hook 'before-save-hook 'destroy-trailing-whitespace)
+    (remove-hook 'before-save-hook 'destroy-trailing-whitespace)))
+
+(provide 'destroy-trailing-whitespace)
+;;; destroy-trailing-whitespace.el ends here