#+TITLE: Spell Checking layer

* Table of Contents                                         :TOC_4_gh:noexport:
 - [[#description][Description]]
 - [[#install][Install]]
   - [[#layer][Layer]]
   - [[#spell-checker-configuration][Spell Checker Configuration]]
   - [[#disabling-by-default][Disabling by default]]
   - [[#enabling-auto-dictionary-mode][Enabling auto-dictionary-mode]]
   - [[#enable-auto-completion-popup][Enable auto-completion popup]]
 - [[#key-bindings][Key Bindings]]

* Description
This layer provides spell checking using [[http://www-sop.inria.fr/members/Manuel.Serrano/flyspell/flyspell.html][Flyspell]] and [[https://github.com/nschum/auto-dictionary-mode][auto-dictionary-mode]].

* Install
** Layer
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =spell-checking= to the existing =dotspacemacs-configuration-layers= list in this
file.

** Spell Checker Configuration
The built-in Emacs variable that controls which external spell-checking program
is used is =ispell-program-name=, which can be set in your
=dotspacemacs/user-init= function if you do not like the default. It will give
priority to =aspell= if it is installed on your system. Another important
variable to be aware of is =ispell-dictionary= which will control the default
dictionary used by =ispell-program-name= (instead of using this variable you can
also use the key binding ~SPC S d~).

** Disabling by default
By default, =spell-checking= is enabled in all available major modes and may be
toggled off with ~SPC t S~. You can default this to off by setting the variable
=spell-checking-enable-by-default= to =nil=:

#+BEGIN_SRC emacs-lisp
(setq-default dotspacemacs-configuration-layers
  '((spell-checking :variables spell-checking-enable-by-default nil)))
#+END_SRC

** Enabling auto-dictionary-mode
=auto-dictionary-mode= tries to detect the current language from the buffer
content, and activate the corresponding dictionary. You can enable it by setting
the variable =spell-checking-enable-auto-dictionary= to something other than
=nil=:

#+BEGIN_SRC emacs-lisp
(setq-default dotspacemacs-configuration-layers
  '((spell-checking :variables spell-checking-enable-auto-dictionary t)))
#+END_SRC

Some people encountered bugs with =auto-dictionary-mode=, especially in *daemon
mode* where new =emacsclient= open directly freezed. If so, no other workaround
have been found yet than disabling =auto-dictionary-mode= completely.

Not all languages are supported by =auto-dictionary-list=. The supported
languages are listed in the =adict-language-list= variable, that can be checked
with =spacemacs/describe-variable=. For convenience, here is the list of
currently supported language:

| Language          |
|-------------------|
| catalan           |
| classical greek   |
| danish            |
| english           |
| esperanto         |
| french            |
| german            |
| hindi             |
| hungarian         |
| modern greek      |
| norwegian bokmål  |
| norwegian nynorsk |
| portuguese        |
| romanian          |
| slovak            |
| slovene           |
| spanish           |
| swedish           |

** Enable auto-completion popup
To enable auto-completion popup when the point is idle on a misspelled word
set the layer variable =enable-flyspell-auto-completion= to t:

#+BEGIN_SRC emacs-lisp
(setq-default dotspacemacs-configuration-layers
  '((spell-checking :variables =enable-flyspell-auto-completion= t)))
#+END_SRC

* Key Bindings

| Key Binding | Description              |
|-------------+--------------------------|
| ~SPC S b~   | flyspell whole buffer    |
| ~SPC S c~   | flyspell correct         |
| ~SPC S d~   | change dictionary        |
| ~SPC S n~   | flyspell goto next error |
| ~SPC t S~   | toggle flyspell          |
