alchemist-mix-format-spacemacs.el

  ;; Support mix format command
  (defun alchemist-mix-format (&optional prefix)
    "Runs mix format in the project"
    (interactive)
    (alchemist-mix-execute (list "format") prefix))

  (defun alchemist-mix-format-buffer (&optional prefix)
    "Runs mix format on the current buffer"
    (interactive)
    (alchemist-mix-execute (list "format" (buffer-file-name)) prefix))

  (eval-after-load "alchemist-mix"
    (spacemacs/set-leader-keys-for-major-mode 'elixir-mode
      "fa" 'alchemist-mix-format
      "fb" 'alchemist-mix-format-buffer))