关于“杀戮环保存”的建议 [英] Advice for "kill-ring-save"

问题描述

我想评估某些条件，然后再允许用户复制文本。据我所知，我需要一个有关 kill-ring-save 的建议。如果不满足条件，我需要忽略用户复制该文本的请求，如果满足，则允许它。我怎样才能做到这一点？

I want to evaluate certain conditions before allowing a user to copy a text. As far as I know, I need an advice for "kill-ring-save". I need to ignore the user request to Copy that text if conditions are not met and allow it if are satisfied. How can I do this?

（更新）
-有关约束的更多信息：仅在Emacs的特定模式（例如NXML模式）下，才应应用此建议，并且仅当一个/多个时才应使用

(UPDATE) -- MORE ABOUT CONSTRAINTS: only in specific mode of Emacs (e.g. NXML mode) this advice should be applied and only when one/more specific conditions are met.

推荐答案

快速概念验证；

(defvar moo nil)

(defadvice kill-ring-save (around kill-ring-check-constraints activate compile)
  "If in `nxml-mode', don't save to kill ring if `moo' is `nil'."
  (if (and (eq major-mode 'nxml-mode) (null moo))
    (message "Not copied.")
   ad-do-it) )

为响应以下评论，添加了其他主要模式约束。如果您希望在每种模式下都这样做，只需进行模式检查即可。

The additional major-mode constraint was added in response to comments below. If you want this in every mode, just take out the mode check.

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