GNU bug report logs - #28140
Here is a possible bug in documentation for 4.4

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: bamber ward <dlward134 <at> gmail.com>
Subject: bug#28140: closed (Re: bug#28140: Here is a possible bug in
 documentation for 4.4)
Date: Sun, 29 Oct 2017 03:29:02 +0000

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Your bug report

#28140: Here is a possible bug in documentation for 4.4

which was filed against the sed package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 28140 <at> debbugs.gnu.org.

-- 
28140: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28140
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Assaf Gordon <assafgordon <at> gmail.com>
To: bamber ward <dlward134 <at> gmail.com>, 28140-done <at> debbugs.gnu.org
Subject: Re: bug#28140: Here is a possible bug in documentation for 4.4
Date: Sat, 28 Oct 2017 21:28:22 -0600

On 2017-10-12 12:31 AM, Assaf Gordon wrote:
>> On 18/08/17 09:34 AM, bamber ward wrote:
>>> manual 4.4
>>> section 7-8
>>>   sed -E ':x {N ; s/\n/ /g ; s/(.{40,40})/\1\n/ ; /\n/!bx ; P ;D}'
>>> does not work as described.
> 
> I'm thinking of the attached patch,
> which replaces the overly terse (and incorrect) example
> with a longer version with better comments.

Push here:
  https://git.savannah.gnu.org/cgit/sed.git/commit/?id=490b4997

regards,
 - assaf

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From: bamber ward <dlward134 <at> gmail.com>
To: bug-sed <at> gnu.org
Subject: Here is a possible bug in documentation for 4.4
Date: Fri, 18 Aug 2017 16:34:13 +0100

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manual 4.4
section 7-8
 sed -E ':x {N ; s/\n/ /g ; s/(.{40,40})/\1\n/ ; /\n/!bx ; P ;D}'
does not work as described. Change line length , say to 5
  sed -E ':x {N ; s/\n/ /g ; s/(.{5,5})/\1\n/ ; /\n/!bx ; P ;D}'
cat line_wrap_input :
apple grape
pear peach
pomengranate

~/sed/code-> sed -E ':x {N ; s/\n/ /g ; s/(.{5,5})/\1\n/ ; /\n/!bx ; P ;
D}' \  line_wrap_input
apple
 grap
e pear peach pomengranate


~/sed/code->

This seems to work:

#!/bin/sed -rf
# line_wrap.sed (

:x
{
   N
   s/\n/ /g
   :y
   s_(.{40,40})_\1\n_
    /.{40,40}/  P
   s/.*\n//
   ty
   /\n/!bx

}

Best Wishes
David L Ward

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