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In my init.el, I have the following line

(setq custom-file (expand-file-name "custom.el" user-emacs-directory))

which is supposed to set the file custom.el into .emacs.d config folder for getting all customization tidy. Over the years, emacs populated this file with various things.

I ran customization with M-x customize-variable and made some change and saved them. Afterwards, I discovered that emacs added the new custom into custom.el, overwriting the previous version of the file.

What's the mistake? Should I put (load custom-file) after the line above? Can this be the problem?

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  • Please add that info to your question. Comments can be deleted at any time. Thx.
    – Drew
    Apr 28, 2021 at 20:23
  • I'm not sure I understand the question, but you should carefully read all of C-h v custom-file if you haven't done that already.
    – phils
    Apr 28, 2021 at 22:36

1 Answer 1

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You used M-x customize-variable, edited the option value, and then saved it. When you save your changes they're written to your custom-file (or your init file, if you have no custom-file defined). So yes, it's normal that custom-file was overwritten.

Yes, in your init file, somewhere after you define the value of option custom-file, you need to load that file, if you want Emacs to recognize its customizations.

And it's generally better to use customize-save-variable or customize-set-variable than just setq, to change the value of a user option. It's not critical here, but it's a good habit to have.

For example, in your init file:

;; Possibly some stuff...

(customize-save-variable 'custom-file  (expand-file-name "custom.el" user-emacs-directory))

;; Possibly some other stuff...

(load-file custom-file)

;; Possibly some other stuff...

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