init.el

;; the package manager
(require 'package)
(setq
 use-package-always-ensure t
 package-archives '(("gnu" . "http://elpa.gnu.org/packages/")
                    ("org" . "http://orgmode.org/elpa/")
                    ("melpa" . "http://melpa.org/packages/")))

(package-initialize)
(when (not package-archive-contents)
  (package-refresh-contents)
  (package-install 'use-package))
(require 'use-package)

(use-package flx-ido
  :demand
  :init
  (setq
   ido-enable-flex-matching t
   ;; C-d to open directories
   ;; C-f to revert to find-file
   ido-show-dot-for-dired nil
   ido-use-faces nil
   ido-enable-dot-prefix t)
  :config
  (ido-mode 1)
  (ido-everywhere 1)
  (flx-ido-mode 1))

;; ensime
(use-package ensime
  :commands ensime ensime-mode)

(add-hook 'scala-mode-hook 'ensime-mode)