Box character simple substitution

" Box character (turburul) hax  ==========================================-v-1==
  " This:
  " r----v-,
  " |    | |
  " >----+-<
  " |    | |
  " >————+—<
  " |    | |
  " L----^-’
  "
  " Becomes This:
  " ┌────┬─┐
  " │    │ │
  " ├────┼─┤
  " │    │ │
  " ├────┼─┤
  " │    │ │
  " └────┴─┘
function! g:BoxCharacters()
  :s'r'┌'e
  gv
  :s','┐'e
  gv
  :s'’'┘'e
  gv
  :s/'/┘/e
  gv
  :s'L'└'e

  gv
  :s'|'│'e
  gv
  :s'-'─'e
  gv
  :s'—'─'e
  gv
  :s'+'┼'e

  gv
  :s'\^'┴'e
  gv
  :s'>'├'e
  gv
  :s'v'┬'e
  gv
  :s'T'┬'e
  gv
  :s'<'┤'e
endfunction

vnoremap <silent> <leader>b :call g:BoxCharacters()<cr>