Simple virtualenv manager

venv.sh

#!/bin/bash

VENV_HOME=${VENV_HOME:-$HOME/virtualenv}
SHELL=${SHELL:-/bin/zsh}

exit_err() {
	echo "[ERROR] $1" 1>&2
	exit 1
}

activate() {
	[ ! -f $VENV_HOME/$1/bin/activate ] && exit_err "Virtualenv $1 not found"
	source $VENV_HOME/$1/bin/activate
}

case $1 in
	list)
		for i in $VENV_HOME/*; do
			basename $i
		done
		;;
	run)
		prog="$3"
		args=$(echo $*|sed -e "s/$prog//g" -e "s/run//g")

		activate "$2"
		exec $prog $args
		;;
	create)
		virtualenv "$VENV_HOME/$2" || exit_error "Virtualenv creation failed"
		echo "[INFO] Created virtualenv $2"
		;;
	*)
		activate "$1"
		echo "[INFO] Activated virtualenv $1"
		exec $SHELL
		;;
esac