Adds spell checking transient state

layers/+checkers/spell-checking/README.org

@@ -11,6 +11,7 @@
   - [[#enabling-multi-dictionary-support-with-hunspell][Enabling multi-dictionary support with hunspell]]
   - [[#enable-auto-completion-popup][Enable auto-completion popup]]
 - [[#key-bindings][Key Bindings]]
+  - [[#spell-checking-transient-state][Spell Checking Transient-state]]
 - [[#known-issues][Known issues]]
 
 * Description
@@ -127,6 +128,18 @@ set the layer variable =enable-flyspell-auto-completion= to t:
 | ~SPC S n~   | flyspell goto next error |
 | ~SPC t S~   | toggle flyspell          |
 
+** Spell Checking Transient-state
+
+| Key Binding | Description                                      |
+|-------------+--------------------------------------------------|
+| ~SPC g . b~ | Rerun spell check for the whole buffer           |
+| ~SPC g . d~ | Change dictionary                                |
+| ~SPC g . n~ | Go to next spelling error                        |
+| ~SPC g . c~ | Correct word under cursor                        |
+| ~SPC g . t~ | Toggle spell check                               |
+| ~SPC g . q~ | Quit transient state                             |
+| ~SPC g . Q~ | Quit transient state and disable =flyspell-mode= |
+
 * Known issues
 Vim-empty-lines layer seems incompatible with spell-checking inside org-mode. If
 you experience "Args out of range" error message when invoking ~SPC S c~ inside

layers/+checkers/spell-checking/packages.el

@@ -44,6 +44,27 @@
     :commands (spell-checking/change-dictionary)
     :init
     (progn
+      (spacemacs|define-transient-state spell-checking
+        :title "Spell Checking Transient State"
+        :doc "
+Spell Commands^^             Other
+--------------^^             -----
+[_b_]  check whole buffer    [_t_]  toggle spell check
+[_d_]  change dictionary     [_q_]  exit
+[_n_]  next spell error      [_Q_]  exit and disable spell check
+[_c_]  correct word
+"
+        :on-enter (flyspell-mode)
+        :bindings
+        ("b" flyspell-buffer)
+        ("d" spell-checking/change-dictionary)
+        ("n" flyspell-goto-next-error)
+        ("c" flyspell-correct-previous-word-generic)
+        ("Q" flyspell-mode :exit t)
+        ("q" nil :exit t)
+        ("t" spacemacs/toggle-spelling-checking))
+
+      (spacemacs/set-leader-keys "S." 'spacemacs/spell-checking-transient-state/body)
       (spell-checking/add-flyspell-hook 'text-mode-hook)
       (when spell-checking-enable-by-default
         (add-hook 'prog-mode-hook 'flyspell-prog-mode))