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-;;; show-kill-ring.el --- Displays Previous Kill Ring Entries -*- lexical-binding: t; coding: utf-8; -*-
-;; Show Kill Ring
-;; Stolen from Steve Yegge when he wasn't looking
-;; enhancements and bugs added by Craig Jennings <c@cjennings.net>
-;;
-;;; Commentary:
-;; Browse items you've previously killed.
-;; Yank text using C-u, the index, then C-y.
-;;
-;; I've lovingly kept the nice 1970s aesthetic, complete with wood paneling.
-;; Maybe I'll give it a makeover at some point.
-;;
-;;; Code:
-
-(require 'cl-lib)
-
-(defvar show-kill-max-item-size 1000
- "This represents the size of a \='kill ring\=' entry.
-A positive number means to limit the display of \='kill-ring\=' items to
-that number of characters.")
-
-(defun show-kill-ring-exit ()
- "Exit the show-kill-ring buffer."
- (interactive)
- (quit-window t))
-
-(defun show-kill-ring ()
- "Show the current contents of the kill ring in a separate buffer.
-This makes it easy to figure out which prefix to pass to yank."
- (interactive)
- ;; kill existing one, since erasing it doesn't work
- (let ((buf (get-buffer "*Kill Ring*")))
- (and buf (kill-buffer buf)))
-
- (let* ((buf (get-buffer-create "*Kill Ring*"))
- (temp kill-ring)
- (count 1)
- (bar (make-string 32 ?=))
- (bar2 (concat " " bar))
- (item " Item ")
- (yptr nil) (ynum 1))
- (set-buffer buf)
- (erase-buffer)
-
- (show-kill-insert-header)
-
- ;; show each of the items in the kill ring, in order
- (while temp
- ;; insert our little divider
- (insert (concat "\n" bar item (prin1-to-string count) " "
- (if (< count 10) bar2 bar) "\n"))
-
- ;; if this is the yank pointer target, grab it
- (when (equal temp kill-ring-yank-pointer)
- (setq yptr (car temp) ynum count))
-
- ;; insert the item and loop
- (show-kill-insert-item (car temp))
- (cl-incf count)
- (setq temp (cdr temp)))
-
- ;; show info about yank item
- (show-kill-insert-footer yptr ynum)
-
- ;; use define-key instead of local-set-key
- (use-local-map (make-sparse-keymap))
- (define-key (current-local-map) "q" #'show-kill-ring-exit)
-
- ;; show it
- (goto-char (point-min))
- (setq buffer-read-only t)
- (set-buffer-modified-p nil)
- ;; display-buffer rather than pop-to-buffer
- ;; easier for user to C-u (item#) C-y
- ;; while the point is where they want to yank
- (display-buffer buf)))
-
-(defun show-kill-insert-item (item)
- "Insert an ITEM from the kill ring into the current buffer.
-If it's too long, truncate it first."
- (let ((max show-kill-max-item-size))
- (cond
- ((or (not (numberp max))
- (< max 0)
- (< (length item) max))
- (insert item))
- (t
- ;; put ellipsis on its own line if item is longer than 1 line
- (let ((preview (substring item 0 max)))
- (if (< (length item) (- (frame-width) 5))
- (insert (concat preview "..."))
- (insert (concat preview "\n..."))))))))
-
-(defun show-kill-insert-header ()
- "Insert the show-kill-ring header or a notice if the kill ring is empty."
- (if kill-ring
- (insert "Contents of the kill ring:\n")
- (insert "The kill ring is empty")))
-
-(defun show-kill-insert-footer (yptr ynum)
- "Insert final divider and the yank-pointer (YPTR YNUM) info."
- (when kill-ring
- (save-excursion
- (re-search-backward "^\\(=+ Item [0-9]+ =+\\)$"))
- (insert "\n")
- (insert (make-string (length (match-string 1)) ?=))
- ;; Use number-to-string instead of int-to-string
- (insert (concat "\n\nItem " (number-to-string ynum)
- " is the next to be yanked:\n\n"))
- (show-kill-insert-item yptr)
- (insert "\n\nThe prefix arg will yank relative to this item.")))
-
-(defun empty-kill-ring ()
- "Force garbage collection of huge kill ring entries that I don't care about."
- (interactive)
- (setq kill-ring nil)
- (garbage-collect))
-
-(keymap-global-set "M-S-k" #'show-kill-ring) ;; was M-K, overrides kill-sentence
-
-(provide 'show-kill-ring)
-;;; show-kill-ring.el ends here