__vi_internal_vim_alias()

(

  # run vim if installed

  test -f /usr/bin/vim && exec /usr/bin/vim "$@"

  # run vi otherwise

  test -f /usr/bin/vi && exec /usr/bin/vi "$@"

)

__view_internal_vim_alias()

(

  # run vim -R instead of view if vim installed

  test -f /usr/bin/vim && exec /usr/bin/vim -R "$@"

  # run view otherwise

  test -f /usr/bin/view && exec /usr/bin/view "$@"

)

if [ -n "${BASH_VERSION-}" -o -n "${KSH_VERSION-}" -o -n "${ZSH_VERSION-}" ]; then

  # This will avoid user defined aliases

  case "$(command -v vim)-$(command -v vi)" in

    "/usr/bin/vim-/usr/bin/vi" | "-/usr/bin/vi")

        # apply only when founded vim and vi are in expected dirs from distro

        # we need to call a shell function to avoid shell restarts when vi/vim

        # is being installed/uninstalled

        alias vi=__vi_internal_vim_alias

        alias view=__view_internal_vim_alias

        alias vim=__vi_internal_vim_alias

        ;;

  esac

fi