From: "weber" <hugows@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Keep-only-column
Date: 9 Feb 2007 03:10:33 -0800 [thread overview]
Message-ID: <1171019432.995872.293180@v45g2000cwv.googlegroups.com> (raw)
In-Reply-To: <5332esF1q7gjvU1@mid.individual.net>
On 9 fev, 07:58, Marc Tfardy <m-t-o___CUT__IT...@web.de> wrote:
> Marc Tfardy schrieb:
>
>
>
> > weber wrote:
> > >> Quite frequently I paste stuff which is space-separated.
> > >> I would really like a function that would let me select a region and
> > >> keep only a column, deleting all the rest.
> > >> Anyone knows how I could implement something like this?
> > >> I can do it with regexps, but then I have to come up with a new one
> > >> every time...
> > >> TIA
> > >> HS
>
> > > I think the format of "stuff" can't be understood from above :) Here
> > > it is:
>
> > > variable BLABLA = 438438
> > > variable LABLAC = 312
> > > variable DAUSH = 43538
>
> > > Apply to that region: keep-only-column 2 makes it:
> > > BLABLA
> > > LABLAC
> > > DAUSHD
>
> > Here my draft. Probalby inefficient, but it does the job.
>
> > (defun trim-rectangle (start end)
> > "Trims region to rectangle."
> > (interactive "r")
> > (save-excursion
> > (let ((offset 0)
> > (width 0)
> > (lines (count-lines start end))
> > (i 0))
> > (goto-char start)
> > (beginning-of-line)
> > (setq offset (- start (point)))
> > (goto-char end)
> > (beginning-of-line)
> > (forward-char offset)
> > (setq width (- end (point)))
> > (goto-char start)
> > (while (< i lines)
> > (beginning-of-line)
> > (delete-region (point) (+ (point) offset))
> > (forward-char width)
> > (delete-region (point) (line-end-position))
> > (end-of-line)
> > (forward-char)
> > (setq i (+ i 1))))))
>
> And now slightly tuned version with extra feature - deleting
> trailing whitespaces in the region:
>
> (defun trim-rectangle (start end &optional delete-whitespace)
> "Trims region to rectangle. With \\[universal-argument] deletes
> trailing whitespaces."
> (interactive "*r\nP")
> (save-match-data
> (save-excursion
> (let ((offset 0)
> (width 0)
> (lines (count-lines start end))
> (curren-point 0)
> (i 0))
> (goto-char start)
> (setq offset (current-column))
> (goto-char end)
> (setq width (- (current-column) offset))
> (goto-char start)
> (while (< i lines)
> (beginning-of-line)
> (setq current-point (point))
> (delete-region current-point (+ current-point offset))
> (forward-char width)
> (delete-region (point) (line-end-position))
> (if delete-whitespace
> (progn
> (beginning-of-line)
> (if (re-search-forward "[ \t]*$" (line-end-position) t)
> (delete-region(match-beginning 0) (match-end 0)))
> (end-of-line)))
> (forward-char)
> (setq i (+ i 1)))))))
>
> regards
>
> Marc
Hello.
Here's a version to apply the function to a region.
If there is a easier way plese tell me!
(defun keep-column-on-region (beg end &optional arg)
"Apply keep-column over region."
(interactive "r\np")
(save-excursion
(if mark-active
(let ((beg (region-beginning))
(end (copy-marker (region-end))))
(goto-char beg)
(while (< (point) end)
(beginning-of-line)
(keep-column arg)
(next-line 1))))))
Also, is there a way to make the ARG 0 (instead of 1) when it's not
supplied ?
Thanks
weber
next prev parent reply other threads:[~2007-02-09 11:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-08 19:15 Keep-only-column weber
2007-02-08 19:23 ` Keep-only-column weber
2007-02-08 19:43 ` Keep-only-column Joost Kremers
2007-02-08 19:46 ` Keep-only-column weber
2007-02-08 21:55 ` Keep-only-column Marc Tfardy
2007-02-09 10:47 ` Keep-only-column weber
2007-02-09 10:58 ` Keep-only-column Marc Tfardy
2007-02-09 11:10 ` weber [this message]
2007-02-09 12:35 ` Keep-only-column weber
2007-02-09 12:49 ` Keep-only-column Marc Tfardy
2007-02-09 13:00 ` Keep-only-column weber
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