Zsh auto_cd-like feature implementation

auto_dircmd.zsh

setopt no_auto_cd

function auto_dircmd {
  # Run a command when PS1 contains a valid directory, similar to auto_cd
  if [[ -d "$PWD/$BUFFER" ]] &&
     (( ! $+functions[$BUFFER] )) &&
     (( ! $+commands[$BUFFER] ))
  then
    BUFFER="ls \"./$BUFFER\""
  fi
}

# If the accept-line wrapper already exists don't redefine it
(( ! ${+functions[_auto_dircmd_accept-line]} )) || return 0
case "$widgets[accept-line]" in
  # Override the current accept-line widget, calling the old one
  user:*) zle -N _auto_dircmd_orig_accept-line "${widgets[accept-line]#user:}"
    function _auto_dircmd_accept-line() {
      auto_dircmd
      zle _auto_dircmd_orig_accept-line -- "$@"
    } ;;
  # If no user widget defined, call the original accept-line widget
  builtin) function _auto_dircmd_accept-line() {
      auto_dircmd
      zle .accept-line
    } ;;
esac
zle -N accept-line _auto_dircmd_accept-line