[gnome-games] retro: Make media data persistent

[Adrien Plazas <aplazas src gnome org>]

commit 7f2d89065d19b9eff4f26d599f31d7d4eea2bb3b
Author: Ricard Gascons <gascons1995 gmail com>
Date:   Thu Aug 18 17:26:23 2016 +0200

    retro: Make media data persistent
    
    This commit makes the data of the media used by multi-source games
    persistent across sessions.
    
    This is part of a series of commits to add multi-source support.

 src/retro/retro-runner.vala |   44 +++++++++++++++++++++++++++++++++++++++++++
 src/ui/application.vala     |    6 +++++
 2 files changed, 50 insertions(+), 0 deletions(-)
---
diff --git a/src/retro/retro-runner.vala b/src/retro/retro-runner.vala
index 4f8457e..cbe8765 100644
--- a/src/retro/retro-runner.vala
+++ b/src/retro/retro-runner.vala
@@ -126,6 +126,7 @@ public class Games.RetroRunner : Object, Runner {
        }
 
        public void check_is_valid () throws Error {
+               load_media_data ();
                init ();
        }
 
@@ -134,6 +135,8 @@ public class Games.RetroRunner : Object, Runner {
        }
 
        public void start () throws Error {
+               load_media_data ();
+
                if (!is_initialized)
                        init();
 
@@ -360,6 +363,13 @@ public class Games.RetroRunner : Object, Runner {
                var uri = media.uri;
 
                try_load_game (core, uri);
+
+               try {
+                       save_media_data ();
+               }
+               catch (Error e) {
+                       warning (e.message);
+               }
        }
 
        private void save () throws Error {
@@ -368,6 +378,9 @@ public class Games.RetroRunner : Object, Runner {
 
                save_ram ();
 
+               if (media_set.get_size () > 1)
+                       save_media_data ();
+
                if (!core_supports_snapshotting)
                        return;
 
@@ -468,6 +481,37 @@ public class Games.RetroRunner : Object, Runner {
                        throw new RetroError.COULDNT_LOAD_SNAPSHOT ("Could not load snapshot");
        }
 
+       private void save_media_data () throws Error {
+               var dir = Application.get_medias_dir ();
+               try_make_dir (dir);
+
+               var medias_path = get_medias_path ();
+
+               string contents = media_set.selected_media_number.to_string();
+
+               FileUtils.set_contents (medias_path, contents, contents.length);
+       }
+
+       private void load_media_data () throws Error {
+               var medias_path = get_medias_path ();
+
+               if (!FileUtils.test (medias_path, FileTest.EXISTS))
+                       return;
+
+               string contents;
+               FileUtils.get_contents (medias_path, out contents);
+
+               int disc_num = int.parse(contents);
+               media_set.selected_media_number = disc_num;
+       }
+
+       private string get_medias_path () throws Error {
+               var dir = Application.get_medias_dir ();
+               var uid = uid.get_uid ();
+
+               return @"$dir/$uid.media";
+       }
+
        private string get_screenshot_path () throws Error {
                if (screenshot_path != null)
                        return screenshot_path;
diff --git a/src/ui/application.vala b/src/ui/application.vala
index 712057b..0d752d7 100644
--- a/src/ui/application.vala
+++ b/src/ui/application.vala
@@ -87,6 +87,12 @@ public class Games.Application : Gtk.Application {
                }
        }
 
+       public static string get_medias_dir () {
+               var data_dir = get_data_dir ();
+
+               return @"$data_dir/medias";
+       }
+
        protected override void activate () {
                Gtk.Settings.get_default ().gtk_application_prefer_dark_theme = true;