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I like arbitrary substring matching for buffer completion but I want to disable it when completing file names or directories. The idea is to set ido-enable-prefix to t only when ido-find-file is being used, and nil otherwise.

So something like this looks like it should work but it doesn't.

(setq ido-enable-prefix nil)

(defun ido-init-file-dir ()
  (when (or (eq ido-cur-item 'file) (eq ido-cur-item 'dir))
    (set (make-local-variable 'ido-enable-prefix) t)))

(add-hook 'ido-setup-hook 'ido-init-file-dir)

Any ideas?

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The mistake was using set and make-local-variable instead of just setq. Working version:

(defun ido-setup-file-dir ()
  (when (or (eq ido-cur-item 'file) (eq ido-cur-item 'dir))
    (setq ido-enable-prefix t)))

(add-hook 'ido-setup-hook 'ido-setup-file-dir)

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