1 files changed, 24 insertions, 0 deletions
diff --git a/matrix-roommembers.c b/matrix-roommembers.c
index a437796..cfe36a0 100644
--- a/matrix-roommembers.c
+++ b/matrix-roommembers.c
@@ -314,3 +314,27 @@ GList *matrix_roommembers_get_active_members(
     }
     return members;
 }
+
+
+/**
+ * Get the userid of a member of a room, given their displayname
+ *
+ * @returns a string, which will be freed by the caller, or null if not known
+ */
+gchar *matrix_roommembers_displayname_to_userid(
+        MatrixRoomMemberTable *table, const gchar *who)
+{
+    /* TODO: make this more efficient */
+    GHashTableIter iter;
+    gpointer key, value;
+    g_hash_table_iter_init (&iter, table->hash_table);
+    while (g_hash_table_iter_next (&iter, &key, &value)) {
+        const gchar *user_id = key;
+        MatrixRoomMember *member = value;
+        if(member->current_displayname != NULL
+                && strcmp(who, member->current_displayname) == 0) {
+            return g_strdup(user_id);
+        }
+    }
+    return NULL;
+}