__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