[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Emacs Lisp Programming Questions
From: |
Andreas Röhler |
Subject: |
Re: Emacs Lisp Programming Questions |
Date: |
Wed, 04 Nov 2009 10:24:39 +0100 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20081227) |
David Combs wrote:
> In article <mailman.8228.1254921577.2239.help-gnu-emacs@gnu.org>,
> Kevin Rodgers <kevin.d.rodgers@gmail.com> wrote:
>> clint.laskowski wrote:
>>> Hello, gnu.emacs.help. I have a few questions about programming in
>>> Emacs Lisp. I hope you can help. Here they are:
>>>
>>> 1. Is this a good place to ask questions about programming in Emacs
>>> Lisp, especially with regards to text processing? If there's a better
>>> place, I'd appreciate knowing.
>>>
>>> 2. I want to write an interactive Elisp program to remove sequential
>>> duplicate lines from a buffer. This buffer is not sorted, and it
>>> should not be sorted. The program should simply look for two
>>> sequential lines that are identical, delete one, and then move on to
>>> the next line and do it over until it reaches the end of the buffer.
>>>
...
In use here
(defun just-one-empty-line (&optional beg end)
"Delete consecutive empty lines, retain just one. "
(interactive "*")
(let ((beg (cond (beg beg)
((region-active-p)
(region-beginning))
(t (point-min))))
(end (cond (end (copy-marker end))
((region-active-p)
(copy-marker (region-end)))
(t (copy-marker (point-max))))))
(save-excursion
(save-restriction
(narrow-to-region beg end)
(goto-char beg)
(while (not (eobp))
(while (looking-at "^\\([ \t]*\n\\)[ \t]*$")
(delete-region (match-beginning 1) (match-end 1)))
(forward-line 1)))
(widen))))
Andreas
--
https://code.launchpad.net/s-x-emacs-werkstatt/
http://bazaar.launchpad.net/~a-roehler/python-mode/python-mode.el/