Path: csiph.com!goblin1!goblin.stu.neva.ru!usenet.stanford.edu!not-for-mail
From: Koichi Murase <myoga.murase@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: How to use PROMPT_COMMAND(S) without breaking other scripts
Date: Tue, 25 Aug 2020 00:38:22 +0900
Lines: 23
Approved: bug-bash@gnu.org
Message-ID: <mailman.1008.1598283519.2469.bug-bash@gnu.org>
References: <CAKOZuevPZ1xwhLmLzXt_a=G+azDTouO52MCA=wvh=-M82wzaSQ@mail.gmail.com> <17a0ba52-32ee-b9bc-72ff-3587b2050fbd@case.edu> <CAFLRLk9vNPM5NtypB2UNcDqMZfG3Lmi3zEMGfPqZNacmHCoAoA@mail.gmail.com> <0c10b76f-a7f0-1c52-77b7-4b208035956b@case.edu> <CAFLRLk-BnZ-Mau=TQ43ALwGsFzs7PHawkF3fKZ1HH_O=y_HF0Q@mail.gmail.com>
NNTP-Posting-Host: lists.gnu.org
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Cc: bug-bash@gnu.org
To: Chester Ramey <chet.ramey@case.edu>
Envelope-to: bug-bash@gnu.org
In-Reply-To: <0c10b76f-a7f0-1c52-77b7-4b208035956b@case.edu>
Received-SPF: pass client-ip=2a00:1450:4864:20::634; envelope-from=myoga.murase@gmail.com; helo=mail-ej1-x634.google.com
X-Spam_score_int: -20
X-Spam_score: -2.1
X-Spam_bar: --
X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-BeenThere: bug-bash@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Bug reports for the GNU Bourne Again SHell <bug-bash.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/bug-bash>
List-Post: <mailto:bug-bash@gnu.org>
List-Help: <mailto:bug-bash-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=subscribe>
X-Mailman-Original-Message-ID: <CAFLRLk-BnZ-Mau=TQ43ALwGsFzs7PHawkF3fKZ1HH_O=y_HF0Q@mail.gmail.com>
X-Mailman-Original-References: <CAKOZuevPZ1xwhLmLzXt_a=G+azDTouO52MCA=wvh=-M82wzaSQ@mail.gmail.com> <17a0ba52-32ee-b9bc-72ff-3587b2050fbd@case.edu> <CAFLRLk9vNPM5NtypB2UNcDqMZfG3Lmi3zEMGfPqZNacmHCoAoA@mail.gmail.com> <0c10b76f-a7f0-1c52-77b7-4b208035956b@case.edu>
Xref: csiph.com gnu.bash.bug:16801

2020-08-24 23:57 Chet Ramey <chet.ramey@case.edu>:
> There's no real good solution. I wanted a clean break between the scalar
> and array versions, figuring that the distributions that populated
> PROMPT_COMMAND could easily make that PROMPT_COMMANDS[0].

Thank you for your reply.  OK, if there would be no better solution, I
would go with the first option (to convert PROMPT_COMMAND to
PROMPT_COMMANDS and append mine to PROMPT_COMMANDS) and see if
something happens.

> The problem there is that it interferes with the ability to use
> both, as some distros might want as a transition, and result in
> commands being executed twice.

Now I see the points.  I didn't come to the idea to set the values to
both as I somehow unconsciously assumed that everyone checks the Bash
version when one uses PROMPT_COMMANDS.  Thank you for pointing this
out.  This means that I need to be careful if I would convert
PROMPT_COMMAND set by others into PROMPT_COMMANDS.

--
Koichi