;;; oni-editing.el --- General editing commands and functions  -*- lexical-binding: t; -*-

;; Copyright (C) 2015  Tom Willemse

;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords:

;; 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:

;; Here are some general editing functions and commands.

;;; Code:

(defun oni:change-number-at-point (change-func)
  "Use CHANGE-FUNC to change the number at `point'."
  (let ((num (number-to-string (funcall change-func (number-at-point))))
        (bounds (bounds-of-thing-at-point 'word)))
    (save-excursion
      (delete-region (car bounds) (cdr bounds))
      (insert num))))

(defun oni:change-prev-case (num dir)
  "Change the case of the region or previous word."
  (let ((regfunc (if (eq dir 'up) 'upcase-region 'downcase-region))
        (wordfunc (if (eq dir 'up) 'upcase-word 'downcase-word)))
    (if (> num 1)
        (funcall regfunc (point) (- (point) num))
      (funcall wordfunc -1))))

;;;###autoload
(defun oni:decrease-number-at-point ()
  "Take the number at `point' and replace it with it decreased by 1."
  (interactive)
  (oni:change-number-at-point #'1-))

;;;###autoload
(defun oni:downcase-prev (num)
  (interactive "p")
  (oni:change-prev-case num 'down))

;;;###autoload
(defun oni:increase-number-at-point ()
  "Take the number at `point' and replace it with it increased by 1."
  (interactive)
  (oni:change-number-at-point #'1+))

;;;###autoload
(defun oni:upcase-prev (num)
  (interactive "p")
  (oni:change-prev-case num 'up))

(provide 'oni-editing)
;;; oni-editing.el ends here