印象中，我（原作者）记得一下代码是来自 tpope's 的配置文件：
command! Bigger :let &guifont = substitute(&guifont, '\d\+$', '\=submatch(0)+1', '')
command! Smaller :let &guifont = substitute(&guifont, '\d\+$', '\=submatch(0)-1', '')
印象中，我（原作者）记得一下代码是来自 tpope's 的配置文件：
command! Bigger :let &guifont = substitute(&guifont, '\d\+$', '\=submatch(0)+1', '')
command! Smaller :let &guifont = substitute(&guifont, '\d\+$', '\=submatch(0)-1', '')