gistfile1.txt

function! ScreenMovement(movement)
  if exists("b:physical_line_mode") && b:physical_line_mode && &wrap
    return "g" . a:movement
  else
    return a:movement
  endif
endfunction

function! InsertModeScreenMovement(movement)
  if &filetype != "fuf"
    "return "\u0F".ScreenMovement(a:movement)
    return "<C-O>".ScreenMovement(a:movement)
  else
    return a:movement
  endif
endfunction


inoremap <silent> <expr> <Up> InsertModeScreenMovement('<Up>')
inoremap <silent> <expr> <Down> InsertModeScreenMovement('<Down>')