[gnote] Remember spell-check language per note

[Aurimas Černius <aurimasc src gnome org>]

commit 646ef1e098bd96e5dd7e510e8e8e520d95ec0198
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Oct 20 17:37:34 2013 +0300

    Remember spell-check language per note
    
    Fixes Bug 586350.

 src/watchers.cpp |   43 +++++++++++++++++++++++++++++++++++++++++++
 src/watchers.hpp |    4 ++++
 2 files changed, 47 insertions(+), 0 deletions(-)
---
diff --git a/src/watchers.cpp b/src/watchers.cpp
index 69b209f..198abfe 100644
--- a/src/watchers.cpp
+++ b/src/watchers.cpp
@@ -282,6 +282,8 @@ namespace gnote {
 
 
 #if FIXED_GTKSPELL
+  const char *NoteSpellChecker::LANG_PREFIX = "spellchecklang:";
+
   void NoteSpellChecker::shutdown ()
   {
     detach();
@@ -314,6 +316,11 @@ namespace gnote {
 
     if (!m_obj_ptr) {
       m_obj_ptr = gtk_spell_checker_new();
+      Tag::Ptr tag = get_language_tag();
+      if(tag) {
+        gtk_spell_checker_set_language(m_obj_ptr, sharp::string_replace_first(tag->name(), LANG_PREFIX, 
"").c_str(), NULL);
+      }
+      g_signal_connect(G_OBJECT(m_obj_ptr), "language-changed", G_CALLBACK(language_changed), this);
       gtk_spell_checker_attach(m_obj_ptr, get_window()->editor()->gobj());
     }
   }
@@ -377,6 +384,42 @@ namespace gnote {
                                start_char, end_char);
     }
   }
+
+  void NoteSpellChecker::language_changed(GtkSpellChecker*, gchar *lang, NoteSpellChecker *checker)
+  {
+    try {
+      checker->on_language_changed(lang);
+    }
+    catch(...) {
+    }
+  }
+
+  void NoteSpellChecker::on_language_changed(const gchar *lang)
+  {
+    std::string tag_name = LANG_PREFIX;
+    tag_name += lang;
+    Tag::Ptr tag = get_language_tag();
+    if(tag && tag->name() != tag_name) {
+      get_note()->remove_tag(tag);
+    }
+    tag = ITagManager::obj().get_or_create_tag(tag_name);
+    get_note()->add_tag(tag);
+    DBG_OUT("Added language tag %s", tag_name.c_str());
+  }
+
+  Tag::Ptr NoteSpellChecker::get_language_tag()
+  {
+    Tag::Ptr lang_tag;
+    std::list<Tag::Ptr> tags;
+    get_note()->get_tags(tags);
+    FOREACH(Tag::Ptr tag, tags) {
+      if(sharp::string_index_of(tag->name(), LANG_PREFIX) == 0) {
+        lang_tag = tag;
+        break;
+      }
+    }
+    return lang_tag;
+  }
 #endif
   
   ////////////////////////////////////////////////////////////////////////
diff --git a/src/watchers.hpp b/src/watchers.hpp
index 09b153a..a60eae0 100644
--- a/src/watchers.hpp
+++ b/src/watchers.hpp
@@ -101,11 +101,15 @@ namespace gnote {
       : m_obj_ptr(NULL)
       {}
   private:
+    static const char *LANG_PREFIX;
+    static void language_changed(GtkSpellChecker*, gchar *lang, NoteSpellChecker *checker);
     void attach();
     void detach();
     void on_enable_spellcheck_changed(const Glib::ustring & key);
     void tag_applied(const Glib::RefPtr<const Gtk::TextTag> &,
                      const Gtk::TextIter &, const Gtk::TextIter &);
+    void on_language_changed(const gchar *lang);
+    Tag::Ptr get_language_tag();
 
     GtkSpellChecker *m_obj_ptr;
     sigc::connection  m_tag_applied_cid;