Automatically switch to English keyboard when leaving insert/replace mode in Evil of Spacemacs. And when you enter insert/replace mode again, switch to whatever input method you used last time. Especially useful when you are using other language (non-english) to write content.

.spacemacs

(defun dotspacemacs/user-config ()
  (setq shell-file-name "/bin/bash")

  ; set default var lang_source for ibus arg
  (setq lang_source "xkb:us::eng")

  ; what we do when enter insert mode
  (add-hook 'evil-insert-state-entry-hook
     (lambda ()
       (shell-command (concat "ibus engine " lang_source))))

  ; what we do when enter normal mode from insert mode: always change to US keyboard
  (add-hook 'evil-insert-state-exit-hook
          (lambda ()
               (setq lang_source (shell-command-to-string "ibus engine"))
               (shell-command "ibus engine xkb:us::eng")))

  ; what we do when enter replace mode
  (add-hook 'evil-replace-state-entry-hook
            (lambda ()
              (shell-command (concat "ibus engine " lang_source))))

  ; what we do when enter normal mode from replace mode: always change to US keyboard
  (add-hook 'evil-insert-state-exit-hook
            (lambda ()
              (setq lang_source (shell-command-to-string "ibus engine"))
              (shell-command "ibus engine xkb:us::eng")
              )
            )
)

Adjust the code to your input method, see the manual of ibus command to see what's the id of you input method (in this example is rime and xkb:us::eng). Only support the ibus-based input methods.