GNU bug report logs - #66768
30.0.50; [PATCH] Improve read/append behavior of eshell history command

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Liu Hui <liuhui1610 <at> gmail.com>
Subject: bug#66768: closed (Re: bug#66768: 30.0.50; [PATCH] Improve
 read/append behavior of eshell history command)
Date: Sat, 11 Nov 2023 02:04:02 +0000

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

Your bug report

#66768: 30.0.50; [PATCH] Improve read/append behavior of eshell history command

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

The explanation is attached below, along with your original report.
If you require more details, please reply to 66768 <at> debbugs.gnu.org.

-- 
66768: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66768
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Jim Porter <jporterbugs <at> gmail.com>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 66768-done <at> debbugs.gnu.org
Subject: Re: bug#66768: 30.0.50; [PATCH] Improve read/append behavior of
 eshell history command
Date: Fri, 10 Nov 2023 18:03:07 -0800

Version: 30.1

On 11/7/2023 2:14 AM, Liu Hui wrote:
> Thanks for your comments! I've updated the patch to address all
> concerns.

Everything in your patch looks good to me. I've now merged it as 
8b3969006fe (with a small editorial change to a docstring), and added a 
few extra regression tests for the history code on top as f2b162f8ee5.

Closing this now. Thanks for helping improve Eshell!

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

From: Liu Hui <liuhui1610 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50;
 [PATCH] Improve read/append behavior of eshell history command
Date: Fri, 27 Oct 2023 12:15:00 +0800

[Message part 4 (text/plain, inline)]

Hi,

This patch fixes some corner cases of the eshell history command about
reading (-r) and appending (-a).

Recipe:

1. create a sample history file containing some lines, e.g.

    ls

2. emacs -Q --eval "(setq eshell-history-file-name ...)"  -f eshell

3. type following commands:

$ ls
$ history -a
$ cd /tmp
$ history -a

'history -a' doesn't distinguish old history from new history items of
current buffer, and always appends the whole history list whenever it
is called, resulting in a mess of the content of history file:

    ls
    ls
    ls
    history -a
    ls
    ls
    history -a
    cd /tmp/
    history -a

If another eshell buffer or emacs instance is launched before we quit
this eshell buffer, they will read messed history. Thus this patch
changes behavior of 'history -a' from "append current history list to
history file" to "append new history in current buffer to history
file", which is also consistent with bash's 'history -a'.

4. continue to type:

$ (setq eshell-hist-ignoredups t)
$ history -a; history -r
$ history

'history -r', which calls eshell-read-history, doesn't remove
consecutive "ls" duplicates from the history file. Thus this patch
amends eshell-read-history to make it respect the
eshell-hist-ignoredups option (both t and 'erase).

Since 'history -r' replaces current history list, which is actually
equivalent to bash's 'history -c; history -r', I have updated the help
text. Maybe it should be split into two commands, i.e. adding 'history
-c'?


Best,

--
Liu Hui

[0001-Improve-read-append-behavior-of-eshell-history-comma.patch (text/x-patch, attachment)]

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