[gnome-games/wip/aplazas/781334-refactor-game-sources: 1/5] libretro: Add LibretroUriIterator

[Adrien Plazas <aplazas src gnome org>]

commit 2956b2c815460136b687e457ca0f14518283518f
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun May 7 12:14:09 2017 +0200

    libretro: Add LibretroUriIterator
    
    This will be used to iterate through the available Libretro games.

 plugins/libretro/src/Makefile.am                |    1 +
 plugins/libretro/src/libretro-uri-iterator.vala |   40 +++++++++++++++++++++++
 2 files changed, 41 insertions(+), 0 deletions(-)
---
diff --git a/plugins/libretro/src/Makefile.am b/plugins/libretro/src/Makefile.am
index a5dbff0..89e8611 100644
--- a/plugins/libretro/src/Makefile.am
+++ b/plugins/libretro/src/Makefile.am
@@ -11,6 +11,7 @@ libgames_libretro_plugin_la_SOURCES = \
        libretro-plugin.vala \
        libretro-title.vala \
        libretro-uid.vala \
+       libretro-uri-iterator.vala \
        $(NULL)
 
 libgames_libretro_plugin_la_VALAFLAGS = \
diff --git a/plugins/libretro/src/libretro-uri-iterator.vala b/plugins/libretro/src/libretro-uri-iterator.vala
new file mode 100644
index 0000000..d3fd113
--- /dev/null
+++ b/plugins/libretro/src/libretro-uri-iterator.vala
@@ -0,0 +1,40 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+public class Games.LibretroUriIterator : Object, UriIterator {
+       private Retro.ModuleIterator iterator;
+       private Uri? uri;
+
+       construct {
+               var modules = new Retro.ModuleQuery (true);
+               iterator = modules.iterator ();
+               uri = null;
+       }
+
+       public new Uri? get () {
+               return uri;
+       }
+
+       public bool next () {
+               while (iterator.next ()) {
+                       var core_descriptor = iterator.get ();
+                       try {
+                               if (!core_descriptor.get_is_game ())
+                                       continue;
+                       }
+                       catch (Error e) {
+                               debug (e.message);
+
+                               continue;
+                       }
+
+                       var string_uri = core_descriptor.get_uri ();
+                       uri = new Uri (@"libretro+$string_uri");
+
+                       return true;
+               }
+
+               uri = null;
+
+               return false;
+       }
+}