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Álvaro Ramírez
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Álvaro Ramírez

03 July 2015 Fishing with Emacs

OK not quite, but having recently learned about C-M-w (append-next-kill), I used it in a keyboard macro to fish out matching lines. This is similar to flush-lines, except the kill ring is also populated. This is handy, if you need the flushed lines. Here's an example.

fishing.gif

Here's the equivalent in Emacs lisp: 

(defun flush-kill-lines (regex)
  "Flush lines matching REGEX and append to kill ring.  Restrict to \
region if active."
  (interactive "sFlush kill regex: ")
  (save-excursion
    (save-restriction
      (when (use-region-p)
        (narrow-to-region (point) (mark))
        (goto-char 0))
      (while (search-forward-regexp regex nil t)
        (move-beginning-of-line nil)
        (kill-whole-line)))))