How to detect if in a project, then configure another keybinding for Projectile?

Question

I have a keybinding that's bounded to helm-for-files.

(define-key evil-normal-state-map (kbd "<f9>") 'helm-for-files)

But when I enter a directory which is a project (to being recognized with .projectile file), then I would like to change the keybinding to the following:

(define-key evil-normal-state-map (kbd "<f9>") 'helm-projectile).

But when I enter another directory without any project files, then revert back to the default helm-for-files keybinding.

I looked if there a hook for Projectile exists, but athere isn't any hook available. Any other suggestions, to detect if I'm currently in a Projectile directory?

Answer 1

You can do it like this:

(defun contextual-f9 ()
  (if (projectile-project-p) ;; detect if current buffer is in a project
      (define-key evil-normal-state-map (kbd "<f9>") 'helm-projectile)
    (define-key evil-normal-state-map (kbd "<f9>") 'helm-for-files)))

(add-hook 'find-file-hook #'contextual-f9)
(add-hook 'dired-mode-hook #'contextual-f9)
(add-hook 'window-configuration-change-hook #'contextual-f9)

With window-configuration-change-hook, it is possible to update the keymap if you change window configuration, since it is always the case if you use Helm to switch buffer.

Another simpler solution is that you can just use helm-for-files, but add Helm Projectile sources to helm-for-files-preferred-list:

(add-to-list 'helm-for-files-preferred-list helm-source-projectile-projects)
(add-to-list 'helm-for-files-preferred-list helm-source-projectile-files-list)
(add-to-list 'helm-for-files-preferred-list helm-source-projectile-directories-list)

When not in a project, you will get a normal helm-find-files and when in a project, you get candidates from Helm Projectile.

Answer 2

Actually you can do it by using a wrapper of those two functions:

(defun smart-for-files ()
  "Call `helm-projectile' if `projectile-project-p', otherwise
fallback to `helm-for-files'."
  (interactive)
  (if (projectile-project-p)
      (helm-projectile)
    (helm-for-files)))

then set the keybinding as you want:

(define-key evil-normal-state-map (kbd "<f9>") 'smart-for-files)