disable helm mode for find files

Question

IDO had this disable the special mode and fall back to vanilla find-files. It was useful to be able to use environment variables and their expansion in path names for example.

Is there something similar for helm-find-files (a key to hit during helm-mode-find-file which falls back to find-files?

Moreover, my C-x C-f is not bound to helm-find-files, yet I still get helm-mode-find-file when I hit C-x C-f (or when M-x find-file for that matter). Also puzzled by this. Any ideas?

Answer 1

Disabling helm mode for find-file

Adding an action

There doesn't appear to be a built-in way to switch from helm-filnd-files back to the default Emacs' find-files. However, you can add an action to do this:

(defun old-ff (&optional no-op) (interactive)
       (call-interactively 'find-file))
(helm-add-action-to-source "Fallback find-file"
                       'old-ff
                       helm-source-find-files)

Binding a key to the action

With this code, you will get a new option in the "Action Menu" called "Fallback find-file". However, getting there is a bit awkward - you need to invoke the "Action Menu" first (TAB by default), then scroll to the entry. To add a keybinding to access this directly from the mini-buffer, use the following:

(define-key helm-map (kbd "C-q")
  (lambda () (interactive)
    (helm-quit-and-execute-action 'old-ff))

I'm a little confused by this system, and the documentation is not clear. From my experiments you must use a named function in helm-add-function-to-source if you want to later call that function from helm-quit-and-execute-action. However, helm-add-function-to-source requires a function that takes one argument, and helm-quit-and-execute will only call the function without passing an argument. I've worked around this incompatibility by defining old-ff to take an optional argument that doesn't actually get used.

Config

To get this code invoked at the appropriate time, I use use-package as follows:

(use-package helm
  :ensure helm
  :config
  (progn
    (defun old-ff (&optional no-op) (interactive)
           (call-interactively 'find-file))
    (helm-add-action-to-source "Fallback find-file"
                           'old-ff
                           helm-source-find-files)
    (define-key helm-map (kbd "C-q")
      (lambda () (interactive)
        (helm-quit-and-execute-action 'old-ff)))))

Getting rid of helm mode for C-x C-f

Regarding your second question, you probably have set (helm-mode 1) in your init. This will over-ride the normal C-x C-f keybinding to provide the helm interface instead.

Answer 2

There is a built-in way to disable helm taking over a completing-read handler:

(add-to-list 'helm-completing-read-handlers-alist '(find-file))

Execute this after enabling helm-mode. Alternatively, wrap it with eval-after-load:

(eval-after-load 'helm-mode
  '(add-to-list 'helm-completing-read-handlers-alist '(find-file)))

As for the other question, there is nothing built-in to switch back to vanilla file finding. The best you can do is deactivating automatic expansion by hitting C-<Backspace>.