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In Emacs (23.4.1), how do I enable a minor mode (e.g. auto-fill-mode) for all files in a major mode (e.g. text-mode) under a directory (recursively)?

It doesn't look like directory-local variables can do ths, but I might be wrong.

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You should use a text-mode hook. In your .emacs file:

(defun turn-on-auto-fill-hook ()
  (cond ((string-match "^/home/foo/bar/blat/" buffer-file-name)
         (auto-fill-mode 1))))

(add-hook 'text-mode-hook 'turn-on-auto-fill-hook)

Replace /home/foo/bar/blat with the path to the directory whose files you want to have auto-fill-mode enabled in when visited. Don't remove the caret.

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