ld/multiple-cursors.el
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Merge pull request #207 from vermiculus/master

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Add safety ceiling to cursor count at creation
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Magnar Sveen 2015-07-10 13:56:17 +02:00
commit 97e5db17c5
1 changed files with 33 additions and 2 deletions
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35
multiple-cursors-core.el
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@ -176,9 +176,37 @@ highlights the entire width of the window."
"Returns a unique cursor id" "Returns a unique cursor id"
(incf mc--current-cursor-id)) (incf mc--current-cursor-id))
(defvar mc--max-cursors-original nil
"This variable maintains the original maximum number of cursors.
When `mc/create-fake-cursor-at-point' is called and
`mc/max-cursors' is overridden, this value serves as a backup so
that `mc/max-cursors' can take on a new value. When
`mc/remove-fake-cursors' is called, the values are reset.")
(defcustom mc/max-cursors nil
"Safety ceiling for the number of active cursors.
If your emacs slows down or freezes when using too many cursors,
customize this value appropriately.
Cursors will be added until this value is reached, at which point
you can either temporarily override the value or abort the
operation entirely.
If this value is nil, there is no ceiling."
:type '(integer)
:group 'multiple-cursors)
(defun mc/create-fake-cursor-at-point (&optional id) (defun mc/create-fake-cursor-at-point (&optional id)
"Add a fake cursor and possibly a fake active region overlay based on point and mark. "Add a fake cursor and possibly a fake active region overlay based on point and mark.
Saves the current state in the overlay to be restored later." Saves the current state in the overlay to be restored later."
(unless mc--max-cursors-original
(setq mc--max-cursors-original mc/max-cursors))
(when mc/max-cursors
(unless (< (mc/num-cursors) mc/max-cursors)
(if (yes-or-no-p (format "%d active cursors. Continue? " (mc/num-cursors)))
(setq mc/max-cursors (read-number "Enter a new, temporary maximum: "))
(mc/remove-fake-cursors)
(error "Aborted: too many cursors"))))
(let ((overlay (mc/make-cursor-overlay-at-point))) (let ((overlay (mc/make-cursor-overlay-at-point)))
(overlay-put overlay 'mc-id (or id (mc/create-cursor-id))) (overlay-put overlay 'mc-id (or id (mc/create-cursor-id)))
(overlay-put overlay 'type 'fake-cursor) (overlay-put overlay 'type 'fake-cursor)
@ -382,7 +410,10 @@ the original cursor, to inform about the lack of support."
Do not use to conclude editing with multiple cursors. For that Do not use to conclude editing with multiple cursors. For that
you should disable multiple-cursors-mode." you should disable multiple-cursors-mode."
(mc/for-each-fake-cursor (mc/for-each-fake-cursor
(mc/remove-fake-cursor cursor))) (mc/remove-fake-cursor cursor))
(when mc--max-cursors-original
(setq mc/max-cursors mc--max-cursors-original))
(setq mc--max-cursors-original nil))
(defun mc/keyboard-quit () (defun mc/keyboard-quit ()
"Deactivate mark if there are any active, otherwise exit multiple-cursors-mode." "Deactivate mark if there are any active, otherwise exit multiple-cursors-mode."
@ -424,7 +455,7 @@ The entries are returned in the order they are found in the buffer."
(defun mc--maybe-set-killed-rectangle () (defun mc--maybe-set-killed-rectangle ()
"Add the latest kill-ring entry for each cursor to killed-rectangle. "Add the latest kill-ring entry for each cursor to killed-rectangle.
So you can paste it in later with `yank-rectangle'." So you can paste it in later with `yank-rectangle'."
(let ((entries (mc--kill-ring-entries))) (let ((entries (let (mc/max-cursors) (mc--kill-ring-entries))))
(unless (mc--all-equal entries) (unless (mc--all-equal entries)
(setq killed-rectangle entries)))) (setq killed-rectangle entries))))