如何让emacs自动写入只读文件？ [英] How do I get emacs to write to read-only files automatically?

问题描述

我发现自己编辑了很多只读的文件。我通常碰到 C-x C-q 来调用 toggle-read-only 。然后我点击 Cx Cs 保存并获取，

I am finding myself editing a lot of files that are read-only. I usually hit C-x C-q to call toggle-read-only. Then I hit C-x C-s to save and get,

File foo.txt is write-protected; try to save anyway? (y or n)

击中 y ，该文件被保存，并且文件的权限保持为只读。

After hitting y, the file is saved and the permissions on the file remain read-only.

有没有办法缩短此过程，使其简单地保存文件与Cx铯没有提示呢？应该在 before-save-hook 和 after-save-hook之后插入 chmod 还是有更好的方法？

Is there a way to shorten this process and make it so that simply saving a file with C-x C-s does the whole thing without prompting? Should I look into inserting chmod in before-save-hook and after-save-hook or is there a better way?

推荐答案

添加调用 chmod 在 before-save-hook 将是干净的方式来完成这一点。没有任何设置可以更改，以避免权限检查。

Adding a call to chmod in before-save-hook would be clean way to accomplish this. There isn't any setting you can change to avoid the permissions check.

根据后续问题，这听起来像您想要更改文件由你自动写入。这个代码的作法是：

Based on the follow-up question, it sounds like you'd like the files to be changed to writable by you automatically upon opening. This code does the trick:

(defun change-file-permissions-to-writable ()
  "to be run from find-file-hook, change write permissions"
  (when (not (file-writable-p buffer-file-name))
    (chmod buffer-file-name (file-modes-symbolic-to-number "u+w" (nth 8 (file-attributes buffer-file-name))))
    (if (not (file-writable-p buffer-file-name))
        (message "Unable to make file writable."))))

(add-hook 'find-file-hook 'change-file-permissions-to-writable)

注意：当我在Windows机器上测试时，文件权限没有显示，直到我尝试保存缓冲区，但是它按预期工作。我个人对这种定制感到不安，但这是您的Emacs。 ：）

Note: When I tested it on my Windows machine, the file permissions didn't show up until I tried to save the buffer, but it worked as expected. I personally feel uneasy about this customization, but it's your Emacs. :)

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