emacs-config/lisp/wormhole-cut-mode.el
2020-09-23 17:00:40 -05:00

63 lines
2 KiB
EmacsLisp

;;; wormhole-cut-mode.el --- -*- lexical-binding: t -*-
;; Copyright (C) 2020 Benson Chu
;; Author: Benson Chu <bensonchu457@gmail.com>
;; Created: [2020-09-16 14:27]
;; This file is not part of GNU Emacs
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(defvar wormhole-cut-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "C-w") #'wormhole-cut)
(define-key map (kbd "C-c SPC") #'wormhole-reset-point)
map))
(defvar wormhole-egress-marker nil)
(defvar wormhole-egress-overlay nil)
(defun wormhole-make-overlay ()
(let ((overlay (make-overlay (point) (1+ (point)))))
(overlay-put overlay 'face '(:background "green"))
overlay))
(defun wormhole-reset-point ()
(interactive)
(move-marker wormhole-egress-marker (point))
(move-overlay wormhole-egress-overlay (point) (1+ (point))))
(defun wormhole-cut ()
(interactive)
(kill-region (mark) (point) 'region)
(save-excursion
(goto-char (marker-position wormhole-egress-marker))
(yank)
(wormhole-reset-point)))
(define-minor-mode wormhole-cut-mode ""
nil nil wormhole-cut-mode-map
(if wormhole-cut-mode
(setq wormhole-egress-marker (point-marker)
wormhole-egress-overlay (wormhole-make-overlay))
(setq wormhole-egress-marker nil)
(delete-overlay wormhole-egress-overlay)))
(provide 'wormhole-cut-mode)
;;; wormhole-cut-mode.el ends here