Add spell-checking using Gspell

cmake/FindGspell.cmake

@@ -0,0 +1,14 @@
+include(PkgConfigWithFallback)
+find_pkg_config_with_fallback(Gspell
+    PKG_CONFIG_NAME gspell-1
+    LIB_NAMES gspell-1
+    INCLUDE_NAMES gspell.h
+    INCLUDE_DIR_SUFFIXES gspell-1 gspell-1/gspell
+    DEPENDS Gtk
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Gspell
+    REQUIRED_VARS Gspell_LIBRARY
+    VERSION_VAR Gspell_VERSION)
+

main/CMakeLists.txt

@@ -10,6 +10,7 @@ find_packages(MAIN_PACKAGES REQUIRED
     GObject
     GTK3
     ICU
+    Gspell
 )
 
 set(RESOURCE_LIST
@@ -129,6 +130,7 @@ SOURCES
     src/ui/chat_input/encryption_button.vala
     src/ui/chat_input/occupants_tab_completer.vala
     src/ui/chat_input/smiley_converter.vala
+    src/ui/chat_input/spell_checker.vala
     src/ui/chat_input/view.vala
 
     src/ui/contact_details/blocking_provider.vala

main/src/ui/chat_input/chat_text_view.vala

@@ -39,6 +39,7 @@ public class ChatTextView : ScrolledWindow {
     private int vscrollbar_min_height;
     private SmileyConverter smiley_converter;
     public EditHistory edit_history;
+    private SpellChecker spell_checker;
 
     construct {
         max_content_height = 300;
@@ -47,6 +48,7 @@ public class ChatTextView : ScrolledWindow {
 
         smiley_converter = new SmileyConverter(text_view);
         edit_history = new EditHistory(text_view);
+        spell_checker = new SpellChecker(text_view);
 
         this.get_vscrollbar().get_preferred_height(out vscrollbar_min_height, null);
         this.vadjustment.notify["upper"].connect_after(on_upper_notify);
@@ -57,6 +59,7 @@ public class ChatTextView : ScrolledWindow {
 
     public void initialize_for_conversation(Conversation conversation) {
         edit_history.initialize_for_conversation(conversation);
+        spell_checker.initialize_for_conversation(conversation);
     }
 
     public override void get_preferred_height(out int min_height, out int nat_height) {

main/src/ui/chat_input/spell_checker.vala

@@ -0,0 +1,35 @@
+using Gdk;
+using Gee;
+using Gspell;
+
+using Dino.Entities;
+
+namespace Dino.Ui {
+
+public class SpellChecker {
+
+    private Conversation? conversation;
+    private TextView gspell_view;
+    private HashMap<Conversation, Language> language_cache = new HashMap<Conversation, Language>(Conversation.hash_func, Conversation.equals_func);
+
+    public SpellChecker(Gtk.TextView text_input) {
+        this.gspell_view = TextView.get_from_gtk_text_view(text_input);
+        gspell_view.basic_setup();
+    }
+
+    public void initialize_for_conversation(Conversation conversation) {
+        Checker spell_checker = TextBuffer.get_from_gtk_text_buffer(gspell_view.view.buffer).spell_checker;
+
+        if (this.conversation != null) language_cache[this.conversation] = spell_checker.language;
+
+        this.conversation = conversation;
+
+        if (language_cache.has_key(this.conversation)) {
+            spell_checker.language = language_cache[conversation];
+        } else {
+            spell_checker.language = null;
+        }
+    }
+}
+
+}