Spacemacs on Ubuntu 16.04 - automatically switch between English and Russian layouts on entering and exiting insert state

.spacemacs

;; Spacemacs on Ubuntu 16.04 - automatically switch between English and Russian layouts on entering and exiting insert state
;; "r" command will use English though
;; Idea from https://github.com/syl20bnr/spacemacs/issues/3225
;; exit hook below assumes your langunage #0 (first in Input Sources list) is English
;; if it's not, change 0 to index of English

(defun dotspacemacs/user-config ()
    (setq prev_lang (substring (shell-command-to-string
      "gsettings get org.gnome.desktop.input-sources current")
      7 -1))
    (add-hook 'evil-insert-state-entry-hook
              (lambda ()
                (shell-command (concat
                  "/usr/bin/gsettings set org.gnome.desktop.input-sources current " prev_lang)
                )
              )
    )

    (add-hook 'evil-insert-state-exit-hook
              (lambda ()
                (setq prev_lang (substring (shell-command-to-string
                  "gsettings get org.gnome.desktop.input-sources current")
                  7 -1))
                (shell-command (concat
                  "/usr/bin/gsettings set org.gnome.desktop.input-sources current 0")
                )
              )
    )
)