bash completion for virtual environments (virtualenv) in mac os x

bash_profile_insert.sh

export VENVS=$HOME/venvs  # or whatever your virtualenvs folder is.

# first install brew_completion by calling `brew install brew-completion`
# will add bash_completion in the future. for now this is a place holder for when it will be needed.
if [ -f $(brew --prefix)/etc/bash_completion ]; then
  . $(brew --prefix)/etc/bash_completion
fi

# if you're placing the _act function and its alias in their corresponding files
if [ -f $HOME/.bash_functions ]; then
  . $HOME/.bash_functions
fi

if [ -f $HOME/.bash_aliases ]; then
  . $HOME/.bash_aliases
fi

###########################################################################
# following can also go in .bash_functions         			  #
###########################################################################

_act() {
	if [ -z ${1+x} ]; then
		echo "usage: act <virtual environment in ${VENVS}>"
	elif [ ! -d "${VENVS}/$1" ]; then
		echo "${VENVS}/$1 is not a directory"
	else
		. "$VENVS/$1/bin/activate"
	fi
}

###########################################################################
# following can also go in .bash_aliases         			  #
###########################################################################

alias act=_act

###########################################################################
# following goes into $(brew --prefix)/etc/bash_completions.d/act         #
###########################################################################

_act_completion()
{
    local cword="${COMP_WORDS[COMP_CWORD]}"
    local words=$(find ${VENVS:-"~/venvs"} -type d -maxdepth 1 -mindepth 1 -exec basename {} ';' | sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g' -e 's/\///')
    COMPREPLY=$(compgen -W "${words}" -- "${cword}")
    return 0
}

complete -F _act_completion act

Place this in your ~/.bash_profile script.