my-emacs-d/elpa/multiple-cursors-20161021.1431/mc-cycle-cursors.el
2016-10-24 08:30:06 +02:00

120 lines
4.1 KiB
EmacsLisp

;;; mc-cycle-cursors.el
;; Copyright (C) 2012-2016 Magnar Sveen
;; Author: Magnar Sveen <magnars@gmail.com>
;; Keywords: editing cursors
;; 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 scrolls the buffer to center each cursor in turn.
;; Scroll down with C-v, scroll up with M-v
;; This is nice when you have cursors that's outside of your view.
;;; Code:
(require 'multiple-cursors-core)
(defun mc/next-fake-cursor-after-point ()
(let ((pos (point))
(next-pos (1+ (point-max)))
next)
(mc/for-each-fake-cursor
(let ((cursor-pos (overlay-get cursor 'point)))
(when (and (< pos cursor-pos)
(< cursor-pos next-pos))
(setq next-pos cursor-pos)
(setq next cursor))))
next))
(defun mc/prev-fake-cursor-before-point ()
(let ((pos (point))
(prev-pos (1- (point-min)))
prev)
(mc/for-each-fake-cursor
(let ((cursor-pos (overlay-get cursor 'point)))
(when (and (> pos cursor-pos)
(> cursor-pos prev-pos))
(setq prev-pos cursor-pos)
(setq prev cursor))))
prev))
(defcustom mc/cycle-looping-behaviour 'continue
"What to do if asked to cycle beyond the last cursor or before the first cursor."
:type '(radio (const :tag "Loop around to beginning/end of document." continue)
(const :tag "Warn and then loop around." warn)
(const :tag "Signal an error." error)
(const :tag "Don't loop." stop))
:group 'multiple-cursors)
(defun mc/handle-loop-condition (error-message)
(cl-ecase mc/cycle-looping-behaviour
(error (error error-message))
(warn (message error-message))
(continue 'continue)
(stop 'stop)))
(defun mc/first-fake-cursor-after (point)
"Very similar to mc/furthest-cursor-before-point, but ignores (mark) and (point)."
(let* ((cursors (mc/all-fake-cursors))
(cursors-after-point (cl-remove-if (lambda (cursor)
(< (mc/cursor-beg cursor) point))
cursors))
(cursors-in-order (cl-sort cursors-after-point '< :key 'mc/cursor-beg)))
(car cursors-in-order)))
(defun mc/last-fake-cursor-before (point)
"Very similar to mc/furthest-cursor-before-point, but ignores (mark) and (point)."
(let* ((cursors (mc/all-fake-cursors))
(cursors-before-point (cl-remove-if (lambda (cursor)
(> (mc/cursor-end cursor) point))
cursors))
(cursors-in-order (cl-sort cursors-before-point '> :key 'mc/cursor-end)))
(car cursors-in-order)))
(cl-defun mc/cycle (next-cursor fallback-cursor loop-message)
(when (null next-cursor)
(when (eql 'stop (mc/handle-loop-condition loop-message))
(return-from mc/cycle nil))
(setf next-cursor fallback-cursor))
(mc/create-fake-cursor-at-point)
(mc/pop-state-from-overlay next-cursor)
(recenter))
(defun mc/cycle-forward ()
(interactive)
(mc/cycle (mc/next-fake-cursor-after-point)
(mc/first-fake-cursor-after (point-min))
"We're already at the last cursor."))
(defun mc/cycle-backward ()
(interactive)
(mc/cycle (mc/prev-fake-cursor-before-point)
(mc/last-fake-cursor-before (point-max))
"We're already at the last cursor"))
(define-key mc/keymap (kbd "C-v") 'mc/cycle-forward)
(define-key mc/keymap (kbd "M-v") 'mc/cycle-backward)
(provide 'mc-cycle-cursors)
;; Local Variables:
;; coding: utf-8
;; End:
;;; mc-cycle-cursors.el ends here