This puts the exit status of the last command, or all of its exit statuses if it was a pipeline of multiple commands, into your Bash prompt. They are shown if the command reported failure (i.e., had a nonzero exit status), or if any command in the pipeline did.
To install, put ~/.pipestatus.bash in your home directory, and add this code
at (or near) the end of your ~/.bashrc file:
# add information to the prompt about nonzero exit statuses
. ~/.pipestatus.bashThis named after the Bash
PIPESTATUS
array variable that it makes use of.
This was written back in 2023 but I didn't get around to publishing it widely
until mid-2024, when a bug (that \[ and \] were not used to help the shell
correcty compute how many columns the prompt takes up in the terminal) was
fixed.
I think the positioning and styling is inspired by the way the defualt fish
prompt includes this information, but I am not sure.