Source-able bash function for activating Python venvs

vact.source

# Search for venvs in pwd with an optional suffix 
# and activate the first one found.
#
# $ vact            # Activate first found of env, .env, venv, or .venv
# $ vact [SUFFIX]   # Activate first found of envSUFFIX, etc.
#
# Add to, e.g., ~/.bash_aliases. This version should
# work in Linux/WSL bash and in Windows Git Bash.
#

vact () {
  local VENV_BIN opt
  for opt in env .env venv .venv; do
    if [[ -f "${opt}${1:-}/bin/activate" ]]; then VENV_BIN="${opt}${1:-}/bin"; break; fi
    if [[ -f "${opt}${1:-}/Scripts/activate" ]]; then VENV_BIN="${opt}${1:-}/Scripts"; break; fi
  done

  if [[ -n "${VENV_BIN:-}" ]]; then
    source ${VENV_BIN}/activate
  else
    echo "No venv found."
  fi
}