shell for enable venv and add pwd to PYTHONPATH

use_venv.sh

#!/bin/bash

GLOBAL_PYTHON=$(which python3.10)
if [ -z "$GLOBAL_PYTHON" ]; then
    GLOBAL_PYTHON=$(which python3)
fi

echo "Using global python: $GLOBAL_PYTHON"

CWD=$(pwd)
DIR=$CWD"/.env"
ACTIVATE=$DIR"/bin/activate"

if [ ! -d $DIR ]; then
    # Take action if $DIR exists. #
    mkdir $DIR
    $GLOBAL_PYTHON -m venv $DIR
else
    echo "Virtual environment folder already exists"
fi

if grep -Faq "$DIR" $ACTIVATE; then
    # code if found
    echo "Virtual environment is ready to use"
else
    # code if not found
    echo "Virtual environment is incorrect, recreating..."

    rm -rf $DIR

    # Take action if $DIR exists. #
    mkdir $DIR
    $GLOBAL_PYTHON -m venv $DIR
fi

echo '\n# Virtual Environment' >>$DIR/bin/activate
echo 'export PYTHONPATH=$PYTHONPATH:$PWD' >>$DIR/bin/activate

source $DIR/bin/activate
pip install --upgrade pip
pip install -r requirements.txt

echo
echo "To activate the virtual environment, Please run the following command:"
echo "      source $DIR/bin/activate"
echo