diff options
Diffstat (limited to 'lisp')
| -rw-r--r-- | lisp/simple.el | 77 |
1 files changed, 45 insertions, 32 deletions
diff --git a/lisp/simple.el b/lisp/simple.el index 71db7ffe5d1..f746d738a62 100644 --- a/lisp/simple.el +++ b/lisp/simple.el @@ -5060,6 +5060,16 @@ The comparison is done using `equal-including-properties'." :group 'killing :version "23.2") +(defcustom kill-transform-function nil + "Function to call to transform a string before it's put on the kill ring. +The function is called with one parameter (the string that's to +be put on the kill ring). It should return a string or nil. If +the latter, the string is not put on the kill ring." + :type '(choice (const :tag "No transform" nil) + function) + :group 'killing + :version "28.1") + (defun kill-new (string &optional replace) "Make STRING the latest kill in the kill ring. Set `kill-ring-yank-pointer' to point to it. @@ -5075,38 +5085,41 @@ When the yank handler has a non-nil PARAM element, the original STRING argument is not used by `insert-for-yank'. However, since Lisp code may access and use elements from the kill ring directly, the STRING argument should still be a \"useful\" string for such uses." - (unless (and kill-do-not-save-duplicates - ;; Due to text properties such as 'yank-handler that - ;; can alter the contents to yank, comparison using - ;; `equal' is unsafe. - (equal-including-properties string (car kill-ring))) - (if (fboundp 'menu-bar-update-yank-menu) - (menu-bar-update-yank-menu string (and replace (car kill-ring))))) - (when save-interprogram-paste-before-kill - (let ((interprogram-paste (and interprogram-paste-function - (funcall interprogram-paste-function)))) - (when interprogram-paste - (setq interprogram-paste - (if (listp interprogram-paste) - ;; Use `reverse' to avoid modifying external data. - (reverse interprogram-paste) - (list interprogram-paste))) - (when (or (not (numberp save-interprogram-paste-before-kill)) - (< (seq-reduce #'+ (mapcar #'length interprogram-paste) 0) - save-interprogram-paste-before-kill)) - (dolist (s interprogram-paste) - (unless (and kill-do-not-save-duplicates - (equal-including-properties s (car kill-ring))) - (push s kill-ring))))))) - (unless (and kill-do-not-save-duplicates - (equal-including-properties string (car kill-ring))) - (if (and replace kill-ring) - (setcar kill-ring string) - (let ((history-delete-duplicates nil)) - (add-to-history 'kill-ring string kill-ring-max t)))) - (setq kill-ring-yank-pointer kill-ring) - (if interprogram-cut-function - (funcall interprogram-cut-function string))) + ;; Allow the user to transform or ignore the string. + (when (or (not kill-transform-function) + (setq string (funcall kill-transform-function string))) + (unless (and kill-do-not-save-duplicates + ;; Due to text properties such as 'yank-handler that + ;; can alter the contents to yank, comparison using + ;; `equal' is unsafe. + (equal-including-properties string (car kill-ring))) + (if (fboundp 'menu-bar-update-yank-menu) + (menu-bar-update-yank-menu string (and replace (car kill-ring))))) + (when save-interprogram-paste-before-kill + (let ((interprogram-paste (and interprogram-paste-function + (funcall interprogram-paste-function)))) + (when interprogram-paste + (setq interprogram-paste + (if (listp interprogram-paste) + ;; Use `reverse' to avoid modifying external data. + (reverse interprogram-paste) + (list interprogram-paste))) + (when (or (not (numberp save-interprogram-paste-before-kill)) + (< (seq-reduce #'+ (mapcar #'length interprogram-paste) 0) + save-interprogram-paste-before-kill)) + (dolist (s interprogram-paste) + (unless (and kill-do-not-save-duplicates + (equal-including-properties s (car kill-ring))) + (push s kill-ring))))))) + (unless (and kill-do-not-save-duplicates + (equal-including-properties string (car kill-ring))) + (if (and replace kill-ring) + (setcar kill-ring string) + (let ((history-delete-duplicates nil)) + (add-to-history 'kill-ring string kill-ring-max t)))) + (setq kill-ring-yank-pointer kill-ring) + (if interprogram-cut-function + (funcall interprogram-cut-function string)))) ;; It has been argued that this should work like `self-insert-command' ;; which merges insertions in `buffer-undo-list' in groups of 20 |