Python prompt

A bash function to help displaying Python's venv info in the prompt.

Here's what it looks like (I also use git-prompt.

Installation

Clone the repo and source python-prompt.sh from your ~/.bashrc, I like doing so by having a list of extra things to load, like this:

for extra in /etc/bash_completion ~/.git-prompt.sh ~/clones/python-prompt/python-prompt.sh
do
    if [ -f "$extra" ]
    then
        . $extra
    fi
done

Setup

Don't forget the installation step!

TL;DR

if ! [[ -f ~/.fonts/dejavu/DejaVuSansMonoNerdFontCompleteMono.ttf ]]
then
    mkdir -p ~/.fonts/dejavu/
    wget -qO ~/.fonts/dejavu/DejaVuSansMonoNerdFontCompleteMono.ttf https://github.com/ryanoasis/nerd-fonts/raw/master/patched-fonts/DejaVuSansMono/Regular/complete/DejaVu%20Sans%20Mono%20Nerd%20Font%20Complete%20Mono.ttf
fi

PY_BLUE_FG='\e[38;2;53;112;160m'
PY_BLUE_BG='\e[48;2;53;112;160m'
PY_YELLOW_FG='\e[38;2;255;222;87m'
PY_YELLOW_BG='\e[48;2;255;222;87m'

PY_PROMPT='$(python_prompt "${PY_BLUE_FG}🭮${PY_BLUE_BG}${PY_YELLOW_FG}  %s \e[0m${PY_BLUE_FG}🭬\e[0m")'

PS1="\u@\H:\w${PY_PROMPT}\n\$ "

In your ~/.bashrc, let's imagine you're having a PS1 like this:

PS1="\u@\H\$ "

You can inject python-prompt in it like this:

PY_PROMPT='$(python_prompt "(%s)")'
PS1="\u@\H${PY_PROMPT}\$ "

But it's a bit ugly, we can do better by adding Python colors:

PY_BLUE_FG='\e[38;2;53;112;160m'
PY_BLUE_BG='\e[48;2;53;112;160m'
PY_YELLOW_FG='\e[38;2;255;222;87m'
PY_YELLOW_BG='\e[48;2;255;222;87m'
PY_PROMPT='$(python_prompt "${PY_BLUE_FG}${PY_BLUE_BG}${PY_YELLOW_FG} %s \e[0m${PY_BLUE_FG}\e[0m")'

It's not perfect but it starts to work for me. If you feel like installing a few more fonts you can try apt install fonts-noto-core (or any font having U+1FB6E RIGHT TRIANGULAR ONE QUARTER BLOCK and U+1FB6C LEFT TRIANGULAR ONE QUARTER BLOCK) and play with those characters like:

PY_PROMPT='$(python_prompt "${PY_BLUE_FG}🭮${PY_BLUE_BG}${PY_YELLOW_FG} %s \e[0m${PY_BLUE_FG}🭬\e[0m")'

For the last touch, I like to add a little Python logo in there, my ~/.bashrc contains:

if ! [[ -f ~/.fonts/dejavu/DejaVuSansMonoNerdFontCompleteMono.ttf ]]
then
    mkdir -p ~/.fonts/dejavu/
    wget -qO ~/.fonts/dejavu/DejaVuSansMonoNerdFontCompleteMono.ttf https://github.com/ryanoasis/nerd-fonts/raw/master/patched-fonts/DejaVuSansMono/Regular/complete/DejaVu%20Sans%20Mono%20Nerd%20Font%20Complete%20Mono.ttf
fi

so I can use a Python logo from this font like this:

PY_PROMPT='$(python_prompt "${PY_BLUE_FG}🭮${PY_BLUE_BG}${PY_YELLOW_FG}  %s \e[0m${PY_BLUE_FG}🭬\e[0m")'

My real prompt is a tad more complicated than that, with hostname color varying on the actual hostname, git prompt, exit status, ... free to get inspiration from it: https://git.afpy.org/mdk/dotfiles/src/branch/main/.bashrc

But activate already shows the info...

Oh yes, but I do not use source .venv/bin/activate, I'm using direnv to automatically create/activate/deactivate my venvs, using a simple bash function like this:

venv()
{
    printf "VIRTUAL_ENV=.venv\nlayout python3\n" > .envrc
    direnv allow .
}

so when I need a venv I just type venv and boom it's all set:

Alternatives

I've heard of:

• Liquid Prompt
• PowerLevel10k
• Starship
• Powerline
• Pure
• Oh-My-Phosh

But I did not tested any of them.