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113 lines
3.8 KiB
113 lines
3.8 KiB
;;; shift-number.el --- Increase/decrease the number at point
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;; Copyright © 2016 Alex Kost
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;; Author: Alex Kost <alezost@gmail.com>
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;; Created: 12 Apr 2016
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;; Version: 0.1
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;; Package-Version: 0.1
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;; Package-Commit: ba3c1f2e6b01bf14aa1433c2a49098af1c025f7c
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;; URL: https://github.com/alezost/shift-number.el
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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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;; Increase or decrease the number at point with `shift-number-up' and
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;; `shift-number-down' commands.
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;; To install the package manually, add the following to your init file:
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;;
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;; (add-to-list 'load-path "/path/to/shift-number-dir")
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;; (autoload 'shift-number-up "shift-number" nil t)
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;; (autoload 'shift-number-down "shift-number" nil t)
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;; For more verbose description and a gif demonstration, see
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;; <https://github.com/alezost/shift-number.el>.
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;;; Code:
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(defgroup shift-number nil
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"Increase or decrease the number at point."
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:group 'convenience)
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(defcustom shift-number-regexp
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(rx (group (one-or-more num)))
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"Regexp for `shift-number' function.
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The first parenthesized expression must match the number."
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:type 'regexp
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:group 'shift-number)
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(defcustom shift-number-display-message nil
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"If non-nil, display a message after shifting the current number."
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:type 'boolean
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:group 'shift-number)
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(defun shift-number-in-regexp-p (regexp)
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"Return non-nil, if point is inside REGEXP on the current line."
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;; The code originates from `org-at-regexp-p'.
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(save-excursion
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(let ((pos (point))
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(end (line-end-position))
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found exit)
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(beginning-of-line)
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(while (and (not (or exit found))
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(re-search-forward regexp end t))
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(cond
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((> (match-beginning 0) pos)
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(setq exit t))
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((>= (match-end 0) pos)
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(setq found t))))
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found)))
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(defun shift-number (n)
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"Change the number at point by N.
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If there is no number at point, search forward till the end of
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the current line and change it."
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;; The whole number is removed and a new number is inserted in its
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;; place, so `save-excursion' is not used, as it will put the point at
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;; the beginning of the number. Instead, the point is saved and
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;; restored later.
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(let ((old-pos (point)))
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(or (shift-number-in-regexp-p shift-number-regexp)
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(re-search-forward shift-number-regexp (line-end-position) t)
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(error "No number on the current line"))
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(let* ((beg (match-beginning 1))
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(end (match-end 1))
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(old-num (string-to-number
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(buffer-substring-no-properties beg end)))
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(new-num (+ old-num n)))
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(delete-region beg end)
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(insert (number-to-string new-num))
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(goto-char old-pos)
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(when shift-number-display-message
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(message "Number %d has been changed to number %d."
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old-num new-num)))))
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;;;###autoload
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(defun shift-number-up (&optional arg)
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"Increase the number at point (or on the current line) by ARG."
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(interactive "p")
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(shift-number arg))
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;;;###autoload
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(defun shift-number-down (&optional arg)
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"Decrease the number at point (or on the current line) by ARG."
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(interactive "p")
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(shift-number (- arg)))
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(provide 'shift-number)
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;;; shift-number.el ends here
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