Python Venv and PS1 Update Fails In Emas

[tvraman]

bc.org

[tvraman]

Using separate bash process for completion appears to fix the problem

[szermatt]

Could you give more details about what you're doing and what is going wrong? Why did you write "bc.org"?

Using separate bash process will leave the prompt alone, so definitely, it'll fix any issues with setting PS1, but I'd like to understand and hopefully fix the problem.

[tvraman]

Original issue did state what I was doing, will attach again in case it got lost. I'll also include the "activate" bash script generated by Python it's juggling PS1 so it can restore it when the virtual env is deactivated and I suspect that that is getting confused by what bash-completion is doing.

This file must be used with "source bin/activate" from bash

you cannot run it directly

deactivate () { # reset old environment variables if [ -n "${_OLD_VIRTUAL_PATH:-}" ] ; then PATH="${_OLD_VIRTUAL_PATH:-}" export PATH unset _OLD_VIRTUAL_PATH fi if [ -n "${_OLD_VIRTUAL_PYTHONHOME:-}" ] ; then PYTHONHOME="${_OLD_VIRTUAL_PYTHONHOME:-}" export PYTHONHOME unset _OLD_VIRTUAL_PYTHONHOME fi

# Call hash to forget past commands. Without forgetting
# past commands the $PATH changes we made may not be respected
hash -r 2> /dev/null

if [ -n "${_OLD_VIRTUAL_PS1:-}" ] ; then
    PS1="${_OLD_VIRTUAL_PS1:-}"
    export PS1
    unset _OLD_VIRTUAL_PS1
fi

unset VIRTUAL_ENV
unset VIRTUAL_ENV_PROMPT
if [ ! "${1:-}" = "nondestructive" ] ; then
# Self destruct!
    unset -f deactivate
fi

}

unset irrelevant variables

deactivate nondestructive

VIRTUAL_ENV="/home/raman/.local/share/pipx/venvs" export VIRTUAL_ENV

_OLD_VIRTUAL_PATH="$PATH" PATH="$VIRTUAL_ENV/bin:$PATH" export PATH

unset PYTHONHOME if set

this will fail if PYTHONHOME is set to the empty string (which is bad anyway)

could use if (set -u; : $PYTHONHOME) ; in bash

if [ -n "${PYTHONHOME:-}" ] ; then _OLD_VIRTUAL_PYTHONHOME="${PYTHONHOME:-}" unset PYTHONHOME fi

if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then _OLD_VIRTUAL_PS1="${PS1:-}" PS1="(venvs) ${PS1:-}" export PS1 VIRTUAL_ENV_PROMPT="(venvs) " export VIRTUAL_ENV_PROMPT fi

Call hash to forget past commands. Without forgetting

past commands the $PATH changes we made may not be respected

hash -r 2> /dev/null

--

My earlier notes:

• Python Venv, Bash-Completions and PS1

1. I use bash-completions in Emacs 30 built from @.***

2. I use Python 3.10 and run into an issue when activating a Virtual Env

3. If I create the env as python3 -m venv venv, activating it in a shell outside Emacs updates the prompt.

4. However the activate script that python3 sets up does not change the prompt in Bash running under Emacs.

5. I think it is getting confused somehow by the custom PS1 prompt that bash-completions uses

6. I think it's this one: #+begin_src emacs-lisp bash-completion--ps1 "'==emacs==ret=$?==.'"

   #+end_src