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[bug] PROMPT_COMMAND is not executed as expected in some situations

From: Franklin, Jason
Subject: [bug] PROMPT_COMMAND is not executed as expected in some situations
Date: Wed, 15 Apr 2020 14:59:05 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2
-fstack-protector-strong -Wformat -Werror=format-security -Wall
-Wno-parentheses -Wno-format-security
uname output: Linux qipb7lnca 5.4.0-0.bpo.4-amd64 #1 SMP Debian
5.4.19-1~bpo10+1 (2020-03-09) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 16
Release Status: release


I have discovered that PROMPT_COMMAND is not executed before the
printing of PS1 in the following three situations:

(1) <C-x><C-e> is used
(2) histverify is set
(3) completion suggestions are shown


# (1) <C-x><C-e> is used
bash --norc
# enter <C-x><C-e>, type out command "true" and save and quit
# note that PROMPT_COMMAND is not executed

# (2) histverify is set
bash --norc
shopt -s histverify
# note that PS1 is printed w/ last command, but PROMPT_COMMAND
# is not run

# (3) completion suggestions are shown
bash --norc
# ... completions are listed
# PS1 is printed after suggestions, but PROMPT_COMMAND is
# not run

Suggested Fix:

I tried to add code to execute PROMPT_COMMAND directly inside of
prompt_again(), but that didn't work as expected (the prompt would not
even print when I tried this).

It may be that PROMPT_COMMAND needs to be more tightly coupled to the
code that prints PS1.  I thought it would be as simple as that, but I
guess not!

In any case, I hope this helps improve Bash.  Thanks a ton!

Jason Franklin

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