some minimal virtualenvwrapper type shell functions

ave.sh

#!/bin/sh

_ave_usage="Usage: ave VIRTUALENVNAME

For example, to activate a virtualenv named FOO, use: 
  ave FOO 
To activate a virtualenv with a space in its name like 'FOO BAR': 
  ave FOO BAR 
Or more explicitly:
  ave 'FOO BAR'"

_mve_usage="Usage: mve VIRTUALENVNAME

For example, to make a virtualenv named FOO, use:
  mve FOO
To make a virtualenv with a space in its name, quote it:
  mve 'FOO BAR'

The name of the virtualenv you want to make should always be first.
  
Any additional arguments (such as switches) are simply passed through to
virtualenv after the directory name. E.g.:
  mve foobar -p python3.4
For help on these options, run:
  virtualenv --help
  "

_rve_usage="Usage: rve VIRTUALENVNAME

For example, to remove a virtualenv named FOO, use:
  rve FOO
To remove a virtualenv with a space in its name, quote it:
  rve 'FOO BAR'"

# n.b.: we don't clobber the name 'workon' to avoid clashing with concurrent
# virtualenvwrapper installs. But user can alias or whatever
ave () {
	# Find and source the activate script of the named virtualenv.
	# Use virtualenvwrapper's WORKON_HOME if present, otherwise default to
	# ~/.virtualenvs.
	local ve_home="${WORKON_HOME:-${HOME}/.virtualenvs}"
	local ve_name="$*"
	local ve_dir="${ve_home}/${ve_name}"
	local ve_script="${ve_dir}/bin/activate"
	if ! test -n "${ve_name}"; then
		echo "Oops: name a virtualenv to activate."
		echo "$_ave_usage"
		return 1
	fi
	if ! test -e "${ve_script}"; then
		if ! test -d "${ve_dir}"; then
			echo "Virtualenv '${ve_name}' not found (looked for '${ve_dir}')"
		else
			echo "Virtualenv '${ve_name}' is broken (no script at '${ve_script}')"
		fi
		return 1
	fi
	. "${ve_script}"
}

mve () {
	# TODO: bleh, name is required to be first.
	local ve_home="${WORKON_HOME:-${HOME}/.virtualenvs}"
	local ve_name="$1"
	local ve_dir="${ve_home}/${ve_name}"
	if test $# -lt 1 || ! test -n "${ve_name}"; then
		echo "Oops: give a name for the new virtualenv you want to make."
		echo "$_mve_usage"
		return 1
	fi
	shift
	command virtualenv "${ve_dir}" "$@"
}

rve () {
	local ve_home="${WORKON_HOME:-${HOME}/.virtualenvs}"
	local ve_name="$1" #"$@"
	local ve_dir="${ve_home}/${ve_name}"
	if ! test -n "${ve_home}" || ! test -n "${ve_dir}"; then
		echo "Oops: couldn't figure out what to remove."
		echo "Aborting without removing anything."
		return 1
	fi
	if test $# -ne 1 || ! test -n "${ve_name}"; then
		echo "Name exactly one virtualenv name to remove."
		echo ""
		echo "$_rve_usage"
		return 1
	fi
	if ! test -d "${ve_dir}"; then
		echo "Virtualenv '${ve_name}' not found (looked for '${ve_dir}')"
		return 1 
	fi
	if ! trash -v "${ve_dir}"; then
		echo "Failed to remove virtualenv '${ve_name}' (at '${ve_dir}')."
		return 1
	fi
	if test "$VIRTUAL_ENV" = "${ve_dir}"; then
		deactivate
	fi
}

dve () {
	deactivate
}