[latexila/wip/gspell] spell: add a gsetting for the default language

[Sébastien Wilmet <swilmet src gnome org>]

commit 23957d81d6f9795a9d2dda2b3435f3fd1812c359
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Sep 15 14:52:29 2015 +0200

    spell: add a gsetting for the default language
    
    The two gsettings will be added to the preferences dialog in a later
    commit.

 data/org.gnome.latexila.gschema.xml.in |    6 ++++++
 src/document_view.vala                 |    7 ++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.latexila.gschema.xml.in b/data/org.gnome.latexila.gschema.xml.in
index 068e130..cf2c0ff 100644
--- a/data/org.gnome.latexila.gschema.xml.in
+++ b/data/org.gnome.latexila.gschema.xml.in
@@ -82,6 +82,12 @@
     <key name="highlight-misspelled-words" type="b">
       <default>false</default>
       <summary>Highlight Misspelled Words</summary>
+      <description>Whether misspelled words are highlighted by default.</description>
+    </key>
+    <key name="spell-checking-language" type="s">
+      <default>''</default>
+      <summary>Spell Checking Language</summary>
+      <description>The default language used for the spell checking. Set to the empty string to take the 
best language available based on the environment.</description>
     </key>
   </schema>
 
diff --git a/src/document_view.vala b/src/document_view.vala
index 63b6fe9..4785de0 100644
--- a/src/document_view.vala
+++ b/src/document_view.vala
@@ -96,7 +96,12 @@ public class DocumentView : Gtk.SourceView
         }
 
         // spell checking
-        _spell_checker = new Gspell.Checker (null);
+        unowned Gspell.Language? lang = null;
+        string lang_key = _editor_settings.get_string ("spell-checking-language");
+        if (lang_key[0] != '\0')
+            lang = Gspell.Language.from_key (lang_key);
+
+        _spell_checker = new Gspell.Checker (lang);
 
         if (_editor_settings.get_boolean ("highlight-misspelled-words"))
             activate_inline_spell_checker ();