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yank-pop function is easy.
Leaving out the documentation to save space, it looks like this:
(defun yank-pop (arg) (interactive "*p") (if (not (eq last-command 'yank)) (error "Previous command was not a yank")) (setq this-command 'yank) (let ((before (< (point) (mark)))) (delete-region (point) (mark)) (rotate-yank-pointer arg) (set-mark (point)) (insert (car kill-ring-yank-pointer)) (if before (exchange-point-and-mark))))
The function is interactive with a small `p' so the prefix
argument is processed and passed to the function. The command can
only be used after a previous yank; otherwise an error message is
sent. This check uses the variable
last-command which is
discussed elsewhere. (See section 8.5
let clause sets the variable
before to true or false
depending whether point is before or after mark and then the region
between point and mark is deleted. This is the region that was just
inserted by the previous yank and it is this text that will be
replaced. Next the
kill-ring-yank-pointer is rotated so that
the previously inserted text is not reinserted yet again. Mark is set
at the beginning of the place the new text will be inserted and then
the first element to which
kill-ring-yank-pointer points is
inserted. This leaves point after the new text. If in the previous
yank, point was left before the inserted text, point and mark are now
exchanged so point is again left in front of the newly inserted text.
That is all there is to it!
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