GNU bug report logs - #13032
24.3.50; Request: Provide a `delete-duplicate-lines' command

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Juri Linkov <juri <at> jurta.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13032: closed (24.3.50; Request: Provide a `delete-duplicate-lines'
 command)
Date: Mon, 03 Dec 2012 23:53:02 +0000

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Your message dated Tue, 04 Dec 2012 01:49:29 +0200
with message-id <87lidek86u.fsf <at> mail.jurta.org>
and subject line Re: bug#13032: 24.3.50; Request: Provide a `delete-duplicate-lines' command
has caused the debbugs.gnu.org bug report #13032,
regarding 24.3.50; Request: Provide a `delete-duplicate-lines' command
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Dani Moncayo <dmoncayo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Request: Provide a `delete-duplicate-lines' command
Date: Thu, 29 Nov 2012 20:23:16 +0100

Severity: wishlist

Recent versions of MS-Excel and also LibreOffice's Calc have a feature
that I find very useful: the ability of remove duplicate lines from a
given list (range).  I think it would be worth to add such a feature
to Emacs.

That is: provide a function `delete-duplicate-lines' (or some such)
that removes all duplicate lines in the active region and prints in
the echo area a message like "Duplicate lines removed: <n>".

TIA.

PS: There has been some discussion about this in this thread:
http://lists.gnu.org/archive/html/help-gnu-emacs/2012-11/msg00417.html.
 Jambunathan K provided a possible implementation, but it lacks the
message in the echo area (which I think is important).


In GNU Emacs 24.3.50.1 (i386-mingw-nt6.1.7601)
 of 2012-11-28 on MS-W7-DANI
Bzr revision: 111021 jay.p.belanger <at> gmail.com-20121128045113-o6xvwncuryx8al3u
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --with-gcc (4.7) --no-opt --enable-checking --cflags
 -Ic:/emacs/libs/libXpm-3.5.10/include -Ic:/emacs/libs/libXpm-3.5.10/src
 -Ic:/emacs/libs/libpng-1.2.37-lib/include -Ic:/emacs/libs/zlib-1.2.5
 -Ic:/emacs/libs/giflib-4.1.4-1-lib/include
 -Ic:/emacs/libs/jpeg-6b-4-lib/include
 -Ic:/emacs/libs/tiff-3.8.2-1-lib/include
 -Ic:/emacs/libs/libxml2-2.7.8-w32-bin/include/libxml2
 -Ic:/emacs/libs/gnutls-3.0.9-w32-bin/include
 -Ic:/emacs/libs/libiconv-1.9.2-1-lib/include'

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

-- 
Dani Moncayo

[Message part 3 (message/rfc822, inline)]

From: Juri Linkov <juri <at> jurta.org>
To: Dani Moncayo <dmoncayo <at> gmail.com>
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 13032-done <at> debbugs.gnu.org
Subject: Re: bug#13032: 24.3.50;
	Request: Provide a `delete-duplicate-lines' command
Date: Tue, 04 Dec 2012 01:49:29 +0200

>> The ADJACENT argument is an optimization that doesn't require
>> additional memory (to store previous lines in the cache).
>> This is necessary when the user needs to delete duplicate lines
>> in a large sorted file.
>
> Ah, good point.  I guess that the optimization is twofold: in memory
> and also in performance.  Then, IMO this should be explained in the
> docstring, so that users know that they should use this feature when
> running this command over a large chunk of lines.

Thanks for the suggestion, I added this as well.

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