在C模式下Emacs的评论区 [英] Emacs comment-region in C mode

问题描述

在GNU Emacs的，有没有从

In GNU Emacs, is there a good way to change the comment-region command in C mode from

/* This is a comment which extends  */
/* over more than one line in C. */

到

/* This is a comment which extends
   over more than one line in C. */

？我曾尝试

(setq comment-multi-line t)

但这并没有帮助。有一个<一href=\"http://www.gnu.org/software/emacs/manual/html%5Fmono/emacs.html#Multi%5F002dLine-Comments\">section多行注释在Emacs手册，但它并没有提到任何东西。

but this does not help. There is a section on multi-line comments in the Emacs manual, but it does not mention anything.

推荐答案

由于Emacs的21，还有的是一个名为模块<一个href=\"http://cvs.savannah.gnu.org/viewvc/%2Acheckout%2A/emacs/lisp/newcomment.el?root=emacs\"><$c$c>'newcomment,它有不同的注释风格（见变量注释的风格此设置得接近你想要什么：

Since Emacs 21, there's been a module named 'newcomment, which has different comment styles (see the variable 'comment-styles. This setting gets close to what you want:

(setq comment-style 'multi-line)

（注意：你可能应该在该设置'C型钩）。

然而，没有任何的设置，使意见看起来像你想要的东西。

However, none of the settings make the comments look like what you want.

我看到了得到你想要的最简单的方法是添加这个技巧：

The easiest way I saw to get what you want is to add this hack:

(defadvice comment-region-internal (before comment-region-internal-hack-ccs activate)
  "override 4th argument to be just spaces"
  (when (eq major-mode 'c-mode)  ; some condition here
    (let ((arg (ad-get-arg 4)))
      (when arg
        (ad-set-arg 4 (make-string (length arg) ?\ ))))))

为注释风格的当前设置总是preFIX注释行用*（如果不是全部的/ *）。

The current settings for comment-style always prefix the comment lines with " * " (if not the whole " /* ").

如果你没有的Emacs 21，我想你可以简单地下载<一个href=\"http://cvs.savannah.gnu.org/viewvc/%2Acheckout%2A/emacs/lisp/newcomment.el?root=emacs\"><$c$c>newcomment.el从资源库中。我不知道，如果它的工作原理，是在早期版本的Emacs，但它可能是值得一试，虽然升级Emacs的将是一个更好的解决方案。

If you don't have Emacs 21, I suppose you could simply download newcomment.el from the repository. I don't know if it works as-is in earlier versions of Emacs, but it might be worth a shot, though upgrading Emacs would be a better solution.

我的黑客打破了取消注释区域。一个适当的解决将是改变注释的padright 。这将需要多一点研究，以免破坏其他的东西。以上只是黑客行为的变化在'C模式（调整状态，以自己的喜好）。

My hack breaks the 'uncomment-region. A proper fix would be to change 'comment-padright. That would take a little more research so as not to break other things. The above hack only changes behavior in 'c-mode (adjust the condition to your liking).

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