statusline_example.vim

    function! TestReturnHighlight()
        if &spell
            return '%#PreProc#%l%0'
        else
            return 'Not spelling and no colors'
        endif
    endfunction

    function! SetStatuslineSnippet()
        let l:str_stl = ''

        let l:str_stl .= TestReturnHighlight()

        return l:str_stl
    endfunction

    " Set the statusline for non airline times
    set statusline=%!SetStatuslineSnippet()