RotateBuffer

gistfile1.vim

function! RotateBuffer()
  let rb=[]
  for x in range(max(map(getline(1, '$'), 'len(v:val)')))
    call add(rb, [])
    for y in range(line('$'))
      call add(rb[x], ' ')
    endfor
  endfor
  let y = 0
  for line in getline(1,'$')
    let x = 0
    for c in split(line, '\zs')
      let rb[x][y] = c
      let x += 1
    endfor
    let y += 1
  endfor
  %d
  for l in rb
    call append(1, join(l, ''))
  endfor
  0d
endfunction