Highlight a line with signs in Vim

highlight_cells.vim

hi cellDelimiterHi ctermbg=8 ctermfg=0
sign define cellLine linehl=cellDelimiterHi

function! HighlightCellDelimiter()
  execute "sign unplace * group=cellsDelimiter file=".expand("%")

  for l:lnum in range(line("w0"), line("w$"))
    if getline(l:lnum) =~ "^#%%$"
      execute "sign place ".l:lnum." line=".l:lnum." name=cellLine group=cellsDelimiter file=".expand("%")
    endif
  endfor
endfunction

" uncomment to call to update signs when cursor moves in python files
" autocmd! CursorMoved *.py call HighlightCellDelimiter()

" uncomment to remove sign column
" set signcolumn=no