automatic virtualenv discovery & activation on path change.

.auto_virtualenv.sh

#
# adapted from http://www.burgundywall.com/tech/automatically-activate-virtualenv
# source this in your .bash_profile and you're done
#
# todo: ability to set a different virtualenv name
#

export PREVPWD=`pwd`
export PREVENV_PATH=
 
handle_virtualenv(){
  if [ "$PWD" != "$PREVPWD" ]; then
    PREVPWD="$PWD";
    if [ -n "$PREVENV_PATH" ]; then
      if [ "`echo "$PWD" | grep -c $PREVENV_PATH`" = "0"  ]; then
        deactivate
        unalias python 2> /dev/null
        PREVENV_PATH=
      fi
    fi
 
    # activate virtualenv dynamically
    if [ -e "$PWD/.venv" ] && [ "$PWD" != "$PREVENV_PATH" ]; then
      PREVENV_PATH="$PWD"
      workon `basename $PWD`
    fi
  fi
}
 
export PROMPT_COMMAND=handle_virtualenv
 
export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'
export WORKON_HOME=~/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh