[latexila/wip/gspell] spell: store document spell settings in file metadata

[Sébastien Wilmet <swilmet src gnome org>]

commit 7da9a9ff1ea7ab7d0a990621fe54ff54ce430597
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Sep 25 17:23:48 2015 +0200

    spell: store document spell settings in file metadata

 src/document.vala      |   23 +++++++++++++++++++++++
 src/document_view.vala |   14 +++++++++++++-
 2 files changed, 36 insertions(+), 1 deletions(-)
---
diff --git a/src/document.vala b/src/document.vala
index 23e8062..4d83039 100644
--- a/src/document.vala
+++ b/src/document.vala
@@ -599,4 +599,27 @@ public class Document : Gtk.SourceBuffer
 
         return true;
     }
+
+    public void set_metadata (string key, string? val)
+    {
+        FileInfo info = new FileInfo ();
+
+        if (val != null)
+            info.set_attribute_string (key, val);
+        else
+            // Unset the key
+            info.set_attribute (key, FileAttributeType.INVALID, null);
+
+        if (this.location != null)
+        {
+            try
+            {
+                this.location.set_attributes_from_info (info, FileQueryInfoFlags.NONE);
+            }
+            catch (Error error)
+            {
+                warning ("Set document metadata failed: %s", error.message);
+            }
+        }
+    }
 }
diff --git a/src/document_view.vala b/src/document_view.vala
index cb08d3c..786013c 100644
--- a/src/document_view.vala
+++ b/src/document_view.vala
@@ -23,6 +23,11 @@ public class DocumentView : Gtk.SourceView
 {
     public const double SCROLL_MARGIN = 0.02;
 
+    private static const string METADATA_ATTRIBUTE_SPELL_LANGUAGE =
+        "metadata::latexila-spell-language";
+    private static const string METADATA_ATTRIBUTE_INLINE_SPELL =
+        "metadata::latexila-inline-spell";
+
     private GLib.Settings _editor_settings;
     private Pango.FontDescription _font_desc;
     private Gspell.Checker? _spell_checker = null;
@@ -219,7 +224,14 @@ public class DocumentView : Gtk.SourceView
 
         dialog.run ();
 
-        _spell_checker.set_language (dialog.get_language ());
+        unowned Gspell.Language? lang = dialog.get_language ();
+        _spell_checker.set_language (lang);
+
+        Document doc = get_buffer () as Document;
+        if (lang != null)
+            doc.set_metadata (METADATA_ATTRIBUTE_SPELL_LANGUAGE, lang.to_key ());
+        else
+            doc.set_metadata (METADATA_ATTRIBUTE_SPELL_LANGUAGE, null);
 
         dialog.destroy ();
     }