gistfile1.vim

function! s:set_cursor() abort
  let s:oldline = exists('s:newline') ? s:newline : 5
  let s:newline = line('.')
  let headoff   = s:headoff + 2 + s:secoff

  " going down
  if s:newline > s:oldline
    while index(s:section_header_lines, s:newline) != -1
      let s:newline += 1
    endwhile
    if empty(getline(s:newline)) | let s:newline += 1         | endif
    if s:newline > s:lastline    | let s:newline = s:lastline | endif
  " going up
  elseif s:newline < s:oldline
    while index(s:section_header_lines, s:newline) != -1
      let s:newline -= 1
    endwhile
    if empty(getline(s:newline)) | let s:newline -= 1      | endif
    if s:newline < headoff       | let s:newline = headoff | endif
  endif

  call cursor(s:newline, 5)
endfunction