语雀内容
    用途：在所有类型文件中，visual 模式下把选中内容进行括号、引号包围。
    用法：visual 模式下选择文本，按快捷键 Ctrl-X （需要配置 <Plug>(coc-convert-snippet) ），再输入 brace 可提示包围方式，上下方向键选择再敲回车即可
    image.png截图_20210320232143.gif

    1. # shell 输入：vim .config/coc/ultisnips/all.snippets 
    2. snippet brace[] "brace the selected with [] in visual mode " i
    3. [${VISUAL}$0]
    4. endsnippet
    6. snippet brace() "brace the selected with () in visual mode " i
    7. (${VISUAL}$0)
    8. endsnippet
    10. snippet brace{} "brace the selected with {} in visual mode " i
    11. {${VISUAL}$0}
    12. endsnippet
    14. snippet brace'' "brace the selected with '' in visual mode " i
    15. '${VISUAL}$0'
    16. endsnippet
    18. snippet brace"" "brace the selected with 双引号 in visual mode " i
    19. "${VISUAL}$0"
    20. endsnippet

    todo 利用 ultisnips+python 实现