auto_virtualenv_activate.sh

###
# Automatically activate virtualenv if appropriate.
# This assumes virtualenvs are either:
#   - in $WORKON_HOME folder, in which case it uses workon command to activate the virtualenv.
#   - in ./local folder, in which case it uses ./setenv.sh to activate the virtualenv.
# Note: This will have a conflict if other script overrides cd command.
# e.g. rvm overrides cd command for local .rvm file.
###
 
cd() {
  if builtin cd "$@"; then
    if [[ -s ./setenv.sh ]]; then
      if [[ "$(basename ./${VIRTUAL_ENV})" != "local" ]]; then
        if [[ "$@" != "." ]]; then
          source ./setenv.sh "";
        fi
      fi
    elif [[ -s ${WORKON_HOME}/$(basename ${PWD}) ]]; then
      if [[ "$(basename ./${VIRTUAL_ENV})" != "$(basename ${PWD})" ]]; then
        workon $(basename ${PWD});
      fi
    fi
  else
    return $?;
  fi
}