lib/config: add config values iterator

This is intended to avoid duplicating the string splitting and
traversal code for all clients of the config API.

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/config.cc b/lib/config.cc
index a6b75913..0fe9a268 100644
--- a/lib/config.cc
+++ b/lib/config.cc
@@ -31,6 +31,11 @@ struct _notmuch_config_list {
     char *current_val;
 };
 
+struct _notmuch_config_values {
+    const char *iterator;
+    size_t tok_len;
+};
+
 static const char * _notmuch_config_key_to_string (notmuch_config_key_t key);
 
 static int
@@ -248,6 +253,53 @@ _notmuch_config_load_from_database (notmuch_database_t *notmuch)
     return status;
 }
 
+notmuch_config_values_t *
+notmuch_config_get_values (notmuch_database_t *notmuch, notmuch_config_key_t key)
+{
+    notmuch_config_values_t *values;
+
+    const char *str;
+    const char *key_str = _notmuch_config_key_to_string (key);
+
+    if (! key_str)
+	return NULL;
+
+    str  = _notmuch_string_map_get (notmuch->config, key_str);
+    if (! str)
+	return NULL;
+
+    values = talloc (notmuch, notmuch_config_values_t);
+    if (unlikely(! values))
+	return NULL;
+
+    values->iterator = strsplit_len (str, ';', &(values->tok_len));
+    return values;
+}
+
+notmuch_bool_t
+notmuch_config_values_valid (notmuch_config_values_t *values) {
+    if (! values)
+	return false;
+
+    return (values->iterator != NULL);
+}
+
+const char *
+notmuch_config_values_get (notmuch_config_values_t *values) {
+    return talloc_strndup (values, values->iterator, values->tok_len);
+}
+
+void
+notmuch_config_values_move_to_next (notmuch_config_values_t *values) {
+    values->iterator += values->tok_len;
+    values->iterator = strsplit_len (values->iterator, ';', &(values->tok_len));
+}
+
+void
+notmuch_config_values_destroy (notmuch_config_values_t *values) {
+    talloc_free (values);
+}
+
 notmuch_status_t
 _notmuch_config_load_from_file (notmuch_database_t *notmuch,
 				GKeyFile *file)