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[debbugs-tracker] bug#25355: closed (26.0.50; Provide function to non-de

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#25355: closed (26.0.50; Provide function to non-destructively replace buffer contents)
Date: Sat, 17 Jun 2017 13:49:02 +0000

Your message dated Sat, 17 Jun 2017 13:47:48 +0000
with message-id <address@hidden>
and subject line Re: bug#25355: 26.0.50; Provide function to non-destructively 
replace buffer contents
has caused the debbugs.gnu.org bug report #25355,
regarding 26.0.50; Provide function to non-destructively replace buffer contents
to be marked as done.

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25355: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25355
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--- Begin Message --- Subject: 26.0.50; Provide function to non-destructively replace buffer contents Date: Wed, 04 Jan 2017 13:45:32 +0100
There are many tools (e.g. auto-formatters) that take buffer contents,
reformat them, and write the reformatted output somewhere.  However,
there is no good way how to apply the modified output to the source
buffer.  The naive way (erasing and re-inserting the buffer contents)
loses point and markers.  Therefore there should be a function
(e.g. `replace-buffer-contents') that calculates a minimal diff between
the old and the new contents and uses editing operations (insert,
delete, etc.) to apply the diff.  Ideally this would be done without any
external tools (e.g. 'diff').

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2017-01-04 built on unknown
Repository revision: 44c588a25ce231ce05fb535cd6d7162e91214f45
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules --enable-checking
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Configured features:

Important settings:
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Major mode: Lisp Interaction

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Memory information:
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--- End Message ---
--- Begin Message --- Subject: Re: bug#25355: 26.0.50; Provide function to non-destructively replace buffer contents Date: Sat, 17 Jun 2017 13:47:48 +0000

Philipp Stephani <address@hidden> schrieb am Mo., 12. Juni 2017 um 23:17 Uhr:
Philipp Stephani <address@hidden> schrieb am So., 7. Mai 2017 um 20:21 Uhr:

P.S. Doesn't GNU Diff have code to do this? 

Sure, but it's not a library. libmba was the only library that I've found so far with a usable interface (i.e. that doesn't assume that the input sequences are byte arrays).

Apparently I didn't look closely enough: Diffutils uses an implementation of the Myers algorithm from Gnulib, which is customizable enough to fit our needs. I've attached a patch that uses Gnulib. 

I've pushed a slightly modified version of this patch as d682f0daa3. 

--- End Message ---

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