GNU bug report logs - #46859
28.0.50; [PATCH]: Add option to truncate long lines in xref.el

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Message #50 received at 46859 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 46859 <at> debbugs.gnu.org
Subject: Re: bug#46859: 28.0.50; [PATCH]: Add option to truncate long lines
 in xref.el
Date: Wed, 03 Mar 2021 15:04:22 +0000

[Message part 1 (text/plain, inline)]

>> How so?  AFAICS, it's the exact same kind of output, except that it 
>> gets truncated.  And it's (obviously?) better to see the context of the 
>> pattern you are searching for, instead of the first characters of the 
>> lines on which the pattern is found, in which the pattern might not be 
>> present.
>
> Since Grep doesn't return the column number of the match, we get it from 
> parsing the string again. And if the string is now modified to be 
> truncated from both sides, the column number will become wrong.
>

I did not understand that you need the column number of the match.  That 
could perhaps become a feature request for GNU grep: with -o and -n, also 
print the column number of the first character.

That being said, if you truncate the N first characters of the matching 
line, you have to parse the original line (that is, not the line that grep 
or another tool outputs) to find the matches anyway.

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