Spacemacs Evil Bindings

The introduction of polymode support breaks the existing spacemacs/evil bindings for ein (ala the ipython-notebook. The solution is suprisingly simple - instead of declaring bindings with spacemacs/set-leader-keys-for-major-mode instead use spacemacs/set-leader-keys-for-minor-mode. See the example code below:

(spacemacs/set-leader-keys-for-minor-mode 'ein:notebook
      "y" 'ein:worksheet-copy-cell
      "p" 'ein:worksheet-yank-cell
      "d" 'ein:worksheet-kill-cell
      "h" 'ein:notebook-worksheet-open-prev-or-last
      "i" 'ein:worksheet-insert-cell-below
      "I" 'ein:worksheet-insert-cell-above
      "j" 'ein:worksheet-goto-next-input
      "k" 'ein:worksheet-goto-prev-input
      "l" 'ein:notebook-worksheet-open-next-or-first
      "H" 'ein:notebook-worksheet-move-prev
      "J" 'ein:worksheet-move-cell-down
      "K" 'ein:worksheet-move-cell-up
      "L" 'ein:notebook-worksheet-move-next
      "t" 'ein:worksheet-toggle-output
      "R" 'ein:worksheet-rename-sheet
      "RET" 'ein:worksheet-execute-cell-and-goto-next
      ;; Output
      "C-l" 'ein:worksheet-clear-output
      "C-S-l" 'ein:worksheet-clear-all-output
      ;;Console
      "C-o" 'ein:console-open
      ;; Merge cells
      "C-k" 'ein:worksheet-merge-cell
      "C-j" 'spacemacs/ein:worksheet-merge-cell-next
      "s" 'ein:worksheet-split-cell-at-point
      ;; Notebook
      "C-s" 'ein:notebook-save-notebook-command
      "C-r" 'ein:notebook-rename-command
      "1" 'ein:notebook-worksheet-open-1th
      "2" 'ein:notebook-worksheet-open-2th
      "3" 'ein:notebook-worksheet-open-3th
      "4" 'ein:notebook-worksheet-open-4th
      "5" 'ein:notebook-worksheet-open-5th
      "6" 'ein:notebook-worksheet-open-6th
      "7" 'ein:notebook-worksheet-open-7th
      "8" 'ein:notebook-worksheet-open-8th
      "9" 'ein:notebook-worksheet-open-last
      "+" 'ein:notebook-worksheet-insert-next
      "-" 'ein:notebook-worksheet-delete
      "x" 'ein:notebook-close
      "u" 'ein:worksheet-change-cell-type
      "fs" 'ein:notebook-save-notebook-command)

To get the transient commands working it appears the solution is to work off the ein:notebook minor mode:

(spacemacs|define-transient-state ein-evil
      :title "iPython Notebook Transient State"
      :doc "
 Operations on Cells^^^^^^            On Worksheets^^^^              Other
 ----------------------------^^^^^^   ------------------------^^^^   ----------------------------------^^^^
 [_k_/_j_]^^     select prev/next     [_h_/_l_]   select prev/next   [_t_]^^         toggle output
 [_K_/_J_]^^     move up/down         [_H_/_L_]   move left/right    [_C-l_/_C-S-l_] clear/clear all output
 [_C-k_/_C-j_]^^ merge above/below    [_1_.._9_]  open [1st..last]   [_C-o_]^^       open console
 [_O_/_o_]^^     insert above/below   [_+_/_-_]   create/delete      [_C-s_/_C-r_]   save/rename notebook
 [_y_/_p_/_d_]   copy/paste           ^^^^                           [_x_]^^         close notebook
 [_u_]^^^^       change type          ^^^^                           [_q_]^^         quit transient-state
 [_RET_]^^^^     execute"
      :evil-leader-for-mode (ein:notebook . ".")
      :bindings
      ("q" nil :exit t)
      ("?" spacemacs//ein-devel-ms-toggle-doc)
      ("h" ein:notebook-worksheet-open-prev-or-last)
      ("j" ein:worksheet-goto-next-input)
      ("k" ein:worksheet-goto-prev-input)
      ("l" ein:notebook-worksheet-open-next-or-first)
      ("H" ein:notebook-worksheet-move-prev)
      ("J" ein:worksheet-move-cell-down)
      ("K" ein:worksheet-move-cell-up)
      ("L" ein:notebook-worksheet-move-next)
      ("t" ein:worksheet-toggle-output)
      ("d" ein:worksheet-kill-cell)
      ("R" ein:worksheet-rename-sheet)
      ("y" ein:worksheet-copy-cell)
      ("p" ein:worksheet-yank-cell)
      ("o" ein:worksheet-insert-cell-below)
      ("O" ein:worksheet-insert-cell-above)
      ("u" ein:worksheet-change-cell-type)
      ("RET" ein:worksheet-execute-cell-and-goto-next)
      ;; Output
      ("C-l" ein:worksheet-clear-output)
      ("C-S-l" ein:worksheet-clear-all-output)
      ;;Console
      ("C-o" ein:console-open)
      ;; Merge and split cells
      ("C-k" ein:worksheet-merge-cell)
      ("C-j" spacemacs/ein:worksheet-merge-cell-next)
      ("s" ein:worksheet-split-cell-at-point)
      ;; Notebook
      ("C-s" ein:notebook-save-notebook-command)
      ("C-r" ein:notebook-rename-command)
      ("1" ein:notebook-worksheet-open-1th)
      ("2" ein:notebook-worksheet-open-2th)
      ("3" ein:notebook-worksheet-open-3th)
      ("4" ein:notebook-worksheet-open-4th)
      ("5" ein:notebook-worksheet-open-5th)
      ("6" ein:notebook-worksheet-open-6th)
      ("7" ein:notebook-worksheet-open-7th)
      ("8" ein:notebook-worksheet-open-8th)
      ("9" ein:notebook-worksheet-open-last)
      ("+" ein:notebook-worksheet-insert-next)
      ("-" ein:notebook-worksheet-delete)
      ("x" ein:notebook-close))
    (spacemacs/set-leader-keys "ein" 'spacemacs/ein-devel-transient-state/body)))