source ~/.vim/bundle/tmux-config/tmux-autowrite/autowrite-vim.sh

TMUX_CONFIG=~/.vim/bundle/tmux-config/tmux-autowrite/autowrite-vim.sh

if [ -f $TMUX_CONFIG ]
then
  source $TMUX_CONFIG
fi

Check to see if the tmux config exists
Check to see if the tmux config exists

Don't blindly source files.
