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;;; mc-hide-unmatched-lines.el
;; Copyright (C) 2014 Aleksey Fedotov
;; Author: Aleksey Fedotov <lexa@cfotr.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 minor mode when enabled hides all lines where no cursors (and
;; also hum/lines-to-expand below and above) To make use of this mode
;; press "C-'" while multiple-cursor-mode is active. You can still
;; edit lines while you are in mc-hide-unmatched-lines mode. To leave
;; this mode press "<return>" or "C-g"
;;
;;; Code:
(require 'multiple-cursors-core)
(require 'mc-mark-more)
(defvar hum/hide-unmatched-lines-mode-map (make-sparse-keymap)
"Keymap for hide unmatched lines is mainly for rebinding C-g")
(define-key hum/hide-unmatched-lines-mode-map (kbd "C-g") 'hum/keyboard-quit)
(define-key hum/hide-unmatched-lines-mode-map (kbd "<return>") 'hum/keyboard-quit)
(defun hum/keyboard-quit ()
"Leave hide-unmatched-lines mode"
(interactive)
(mc-hide-unmatched-lines-mode 0))
;; used only in in multiple-cursors-mode-disabled-hook
(defun hum/disable-hum-mode ()
(mc-hide-unmatched-lines-mode 0))
;;;###autoload
(define-minor-mode mc-hide-unmatched-lines-mode
"Minor mode when enabled hides all lines where no cursors (and
also hum/lines-to-expand below and above) To make use of this
mode press \"C-'\" while multiple-cursor-mode is active. You can
still edit lines while you are in mc-hide-unmatched-lines
mode. To leave this mode press <return> or \"C-g\""
nil " hu"
hum/hide-unmatched-lines-mode-map
(if mc-hide-unmatched-lines-mode
;;just in case if mc mode will be disabled while hide-unmatched-lines is active
(progn
(hum/hide-unmatched-lines)
(add-hook 'multiple-cursors-mode-disabled-hook 'hum/disable-hum-mode t t))
(progn
(hum/unhide-unmatched-lines)
(remove-hook 'multiple-cursors-mode-disabled-hook 'hum/disable-hum-mode))))
(defconst hum/invisible-overlay-name 'hum/invisible-overlay-name)
(defcustom hum/lines-to-expand 2
"How many lines below and above cursor to show"
:type '(integer)
:group 'multiple-cursors)
(defcustom hum/placeholder "..."
"Placeholder which will be placed insted of hiden text"
:type '(string)
:group 'multiple-cursors)
(defun hum/add-invisible-overlay (begin end)
(let ((overlay (make-overlay begin
end
(current-buffer)
t
nil
)))
(overlay-put overlay hum/invisible-overlay-name t)
(overlay-put overlay 'invisible t)
(overlay-put overlay 'intangible t)
(overlay-put overlay 'evaporate t)
(overlay-put overlay 'after-string hum/placeholder)))
(defun hum/hide-unmatched-lines ()
(let ((begin (point-min)))
(mc/for-each-cursor-ordered
(save-excursion
(goto-char (mc/cursor-beg cursor))
(if (< begin (line-beginning-position (- hum/lines-to-expand)))
(hum/add-invisible-overlay begin (line-end-position (- hum/lines-to-expand))))
(setq begin (line-beginning-position (+ 2 hum/lines-to-expand)))))
(hum/add-invisible-overlay begin (point-max))))
(defun hum/unhide-unmatched-lines ()
(remove-overlays nil nil hum/invisible-overlay-name t))
(provide 'mc-hide-unmatched-lines-mode)
(define-key mc/keymap (kbd "C-'") 'mc-hide-unmatched-lines-mode)