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