Python Virtual Enviroment setup and sourcer using python-pip and python-venv

venv

#!/bin/bash

SCRIPT_PATH="${BASH_SOURCE[0]#./}"

if [[ ! ${0#./} != $SCRIPT_PATH ]]; then
  echo "You cannot run it directly. This file must be sourced *from bash*: source $SCRIPT_PATH PYTHON"
  exit 1
fi

if [[ $# -ne 1 ]]; then
  echo "Usage: $SCRIPT_PATH PYTHON"
  return 1
else
  VENVDIR=".venv-$1"
  if [[ ! -d $VENVDIR ]]; then
    # creates the virtual environment.
    # PYTHON -m venv .venv-PYTHON
    if ! (
      $1 -m venv "$VENVDIR" && \
      source "$VENVDIR/bin/activate" && \
      pip install -U pip setuptools && \
      pip install --no-cache-dir -r requeriments.txt
    ); then
      # removes the created venv.
      rm -rf "$VENVDIR"
      return 1
    fi
  fi
  # sources the venv previously created.
  source "$VENVDIR/bin/activate"
  # exports the project path as part of the PYTHONPATH.
  source "$(dirname "$SCRIPT_PATH")/pyth"
fi