[gtksourceview] completion: add gtk_source_completion_context_list_providers()

[Christian Hergert <chergert src gnome org>]

commit 71b0891595052a92545499391d9f832db4cc5fed
Author: Christian Hergert <chergert redhat com>
Date:   Fri Sep 2 23:29:01 2022 -0700

    completion: add gtk_source_completion_context_list_providers()
    
    This API can be used to retrieve the list of providers that are found
    within a completion context. You might use this to make a filtered list
    of models and prioritize some items into a high-priority model.

 gtksourceview/gtksourcecompletioncontext.c | 29 +++++++++++++++++++++++++++++
 gtksourceview/gtksourcecompletioncontext.h |  2 ++
 2 files changed, 31 insertions(+)
---
diff --git a/gtksourceview/gtksourcecompletioncontext.c b/gtksourceview/gtksourcecompletioncontext.c
index 1cfa0414..d051ba99 100644
--- a/gtksourceview/gtksourcecompletioncontext.c
+++ b/gtksourceview/gtksourcecompletioncontext.c
@@ -1106,3 +1106,32 @@ gtk_source_completion_context_get_language (GtkSourceCompletionContext *self)
 
        return NULL;
 }
+
+/**
+ * gtk_source_completion_context_list_providers:
+ * @self: a #GtkSourceCompletionContext
+ *
+ * Gets the providers that are associated with the context.
+ *
+ * Returns: (transfer full): a #GListModel of #GtkSourceCompletionProvider
+ *
+ * Since: 5.6
+ */
+GListModel *
+gtk_source_completion_context_list_providers (GtkSourceCompletionContext *self)
+{
+       GListStore *store;
+
+       g_return_val_if_fail (GTK_SOURCE_IS_COMPLETION_CONTEXT (self), NULL);
+
+       store = g_list_store_new (GTK_SOURCE_TYPE_COMPLETION_PROVIDER);
+
+       for (guint i = 0; i < self->providers->len; i++)
+       {
+               const ProviderInfo *info = &g_array_index (self->providers, ProviderInfo, i);
+
+               g_list_store_append (store, info->provider);
+       }
+
+       return G_LIST_MODEL (store);
+}
diff --git a/gtksourceview/gtksourcecompletioncontext.h b/gtksourceview/gtksourcecompletioncontext.h
index 7f3fe8c2..acafa2de 100644
--- a/gtksourceview/gtksourcecompletioncontext.h
+++ b/gtksourceview/gtksourcecompletioncontext.h
@@ -66,5 +66,7 @@ void                           gtk_source_completion_context_set_proposals_for_p
 GTK_SOURCE_AVAILABLE_IN_5_6
 GListModel                    *gtk_source_completion_context_get_proposals_for_provider 
(GtkSourceCompletionContext  *self,
                                                                                          
GtkSourceCompletionProvider *provider);
+GTK_SOURCE_AVAILABLE_IN_5_6
+GListModel                    *gtk_source_completion_context_list_providers             
(GtkSourceCompletionContext  *self);
 
 G_END_DECLS