[grilo-plugins] lua-factory: use requested-keys as keys for lua api

[Victor Toso de Carvalho <victortoso src gnome org>]

commit 72a4e9d1924de741d66b4b5e4ed45e726db3913a
Author: Victor Toso <me victortoso com>
Date:   Thu Mar 3 01:17:43 2016 +0100

    lua-factory: use requested-keys as keys for lua api
    
    We always provided the requested-keys to the lua source as an array with
    the metadata-keys as values. That's not so interesting as the source
    will need to walk in the array to check which keys were requested.
    
    As from commit 2bfcff90d589d43351 we started introducing the
    requested-keys as an argument, it would be good to use this moment and
    improve it.
    
    A table with the metadata-keys as key could be easily accessed in the
    source
    
    e.g
    if requested_keys.artist then
      media.artist = my_artist
    end
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732879

 src/lua-factory/grl-lua-library.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/src/lua-factory/grl-lua-library.c b/src/lua-factory/grl-lua-library.c
index dbcb4cd..a03a995 100644
--- a/src/lua-factory/grl-lua-library.c
+++ b/src/lua-factory/grl-lua-library.c
@@ -1612,16 +1612,22 @@ push_operation_requested_keys (lua_State *L,
   lua_newtable (L);
   for (it = keys; it != NULL; it = it->next) {
     GrlKeyID key_id;
-    const gchar *key_name;
+    char *key_name, *ptr;
 
     key_id = GRLPOINTER_TO_KEYID (it->data);
     if (key_id == GRL_METADATA_KEY_INVALID)
       continue;
 
-    key_name = grl_registry_lookup_metadata_key_name (registry, key_id);
-    lua_pushinteger (L, i);
+    key_name = g_strdup (grl_registry_lookup_metadata_key_name (registry, key_id));
+    /* Replace '-' to '_': convenient for the developer */
+    while ((ptr = strstr (key_name, "-")) != NULL) {
+      *ptr = '_';
+    }
+
     lua_pushstring (L, key_name);
+    lua_pushboolean (L, 1);
     lua_settable (L, -3);
+    g_free (key_name);
     i++;
   }
 }