[recipes] Add API to get all contributors

[Matthias Clasen <matthiasc src gnome org>]

commit 8e2346224b048b2901876cba56dbac7f91e3619c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 5 11:07:52 2017 -0500

    Add API to get all contributors
    
    This returns an array with the names of all chefs which
    have contributed recipes in the database.

 src/gr-recipe-store.c |   23 +++++++++++++++++++++++
 src/gr-recipe-store.h |    2 ++
 2 files changed, 25 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-recipe-store.c b/src/gr-recipe-store.c
index 724562e..0d955f1 100644
--- a/src/gr-recipe-store.c
+++ b/src/gr-recipe-store.c
@@ -1239,6 +1239,29 @@ gr_recipe_store_get_chef_keys (GrRecipeStore *self,
         return (char **)g_hash_table_get_keys_as_array (self->chefs, length);
 }
 
+char **
+gr_recipe_store_get_contributors (GrRecipeStore *self,
+                                  guint         *length)
+{
+        GHashTableIter iter;
+        GrRecipe *recipe;
+        g_autoptr(GHashTable) chefs = NULL;
+
+        chefs = g_hash_table_new (g_str_hash, g_str_equal);
+
+        g_hash_table_iter_init (&iter, self->recipes);
+        while (g_hash_table_iter_next (&iter, NULL, (gpointer *)&recipe)) {
+                if (gr_recipe_is_contributed (recipe)) {
+                        GrChef *chef;
+
+                        chef = g_hash_table_lookup (self->chefs, gr_recipe_get_author (recipe));
+                        g_hash_table_add (chefs, (gpointer)gr_chef_get_fullname (chef));
+                }
+        }
+
+        return (char **)g_hash_table_get_keys_as_array (chefs, length);
+}
+
 const char *
 gr_recipe_store_get_user_key (GrRecipeStore *self)
 {
diff --git a/src/gr-recipe-store.h b/src/gr-recipe-store.h
index f74851e..997de3a 100644
--- a/src/gr-recipe-store.h
+++ b/src/gr-recipe-store.h
@@ -91,6 +91,8 @@ gboolean        gr_recipe_store_has_chef            (GrRecipeStore  *self,
                                                      GrChef         *chef);
 gboolean        gr_recipe_store_has_cuisine         (GrRecipeStore  *self,
                                                      const char     *cuisine);
+char **         gr_recipe_store_get_contributors    (GrRecipeStore *self,
+                                                     guint         *length);
 
 #define GR_TYPE_RECIPE_SEARCH (gr_recipe_search_get_type())