# 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](https://raw.githubusercontent.com/git/git/master/contrib/completion/git-prompt.sh).

![](example.png)


## 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:

```bash
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!

<details>
<summary>TL;DR</summary>

```bash
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\$ "
```

</details>

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

```bash
PS1="\u@\H\$ "
```

You can inject `python-prompt` in it like this:

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

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

```bash
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:

```bash
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:

```bash
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:

```bash
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](https://direnv.net/) to automatically
create/activate/deactivate my venvs, using a simple bash function like this:

```bash
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:

![](venv.png)


## Alternatives

I've heard of:

- [Liquid Prompt](https://github.com/liquidprompt/liquidprompt)
- [PowerLevel10k](https://github.com/romkatv/powerlevel10k)
- [Starship](https://github.com/starship/starship)
- [Powerline](https://github.com/powerline/powerline)
- [Pure](https://github.com/sindresorhus/pure)
- [Oh-My-Phosh](https://ohmyposh.dev/)

But I did not tested any of them.