peev

#!/bin/bash
# peev (Python Environment Exists Virtually)
# Function to select and activate different Python virtual environments; filter menu with positional parameters.
# Be sure to fill in the PEEV_DIR variable (first line of function).
# Bash 4+ required for associative arrays.
function peev {
  local PEEV_DIR=
  declare -A PEEV_PATH

  if [ -z "$1" ]; then
    for peev in $(ls ${PEEV_DIR}); do
      PEEV_PATH[${peev}]="${PEEV_DIR}/${peev}/bin/activate"
    done
  else
    for peev in $(ls ${PEEV_DIR} | grep -i $1); do
      PEEV_PATH[${peev}]="${PEEV_DIR}/${peev}/bin/activate"
    done
  fi

  case ${#PEEV_PATH[@]} in
  0)
    echo "No environments found."
    return 1
    ;;
  1)
    for environment in ${!PEEV_PATH[@]}; do
      source ${PEEV_PATH[${environment}]}
    done
    ;;
  *)
    select environment in ${!PEEV_PATH[@]}; do
      if [ -e "${PEEV_PATH[${environment}]}" ]; then
        source ${PEEV_PATH[${environment}]}
        break
      else
        echo "Incorrect entry."
      fi > /dev/null 2>&1
    done
    ;;
  esac
}