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How to set a directory local variable for a directory itself non-recursively? I don't want the variable set in .dir-locals.el affect the sub-directories.


Edited:

My use case is: I'd like to hide dot files under ~ by setting dired-omit-files since there are quite a lot of them in my home directory. But I do not want to hide dot files of any other subdirectory of ~. Though I think I can set it using some dired-mode-hook by comparing buffer-name or buffer-file-name, I guessed there may be simpler solution by using directory local variables.

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    Not quite a duplicate, but cross-referencing with emacs.stackexchange.com/q/54974/454
    – phils
    Dec 6, 2020 at 9:27
  • You could test (string= (expand-file-name dired-directory) (expand-file-name "~/")) to see whether the current dired buffer is visiting your home directory.
    – phils
    Dec 7, 2020 at 3:00

2 Answers 2

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The Directory Variables section of the emacs manual says:

Here’s an example of a ‘.dir-locals.el’ file:

 ((nil . ((indent-tabs-mode . t)
          (fill-column . 80)
          (mode . auto-fill)))
  (c-mode . ((c-file-style . "BSD")
             (subdirs . nil)))
  ("src/imported"
   . ((nil . ((change-log-default-name
               . "ChangeLog.local"))))))

[... snip ...] The special ‘subdirs’ element is not a variable, but a special keyword which indicates that the C mode settings are only to be applied in the current directory, not in any subdirectories.

so that should do the job, e.g.

((nil . ((dired-omit-files . t)
         (subdirs . nil))))

although for some reason when I test, it seems to be applying to all directories, and don't have time to figure out why. Perhaps you'll have better luck!

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  • 1
    That's a bug. My initial take is that dir-locals-collect-variables is permanently deleting the subdirs element, and so it has no effect in any subsequent usage of that (cached) dir-locals spec. Could you M-x report-emacs-bug?
    – phils
    Dec 4, 2021 at 1:26
  • I have no time right now, sorry. Maybe later. Dec 4, 2021 at 16:43
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No, there isn't. You can set the variable in the directory-local variables, and the unset it in the child directory's variables. Or you can use file-local variables.

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  • There so many subdirectories though... Dec 6, 2020 at 9:17
  • 1
    @stackunderflow I suggest you edit the question to explain your use-case in detail. What you're asking for isn't supported, but depending on what you're actually trying to achieve, there might be other convenient options.
    – phils
    Dec 6, 2020 at 9:26
  • Then consider using file-local variables instead. Or you could certainly consider extending Emacs so that it could support non-recursive directory-local variables.
    – db48x
    Dec 6, 2020 at 9:26
  • @phils I've updated the question details. Dec 7, 2020 at 0:26

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