+/* Returns TRUE iff name and addr is duplicate. If not, stores the
+ * name/addr pair in order to detect subsequent duplicates. */
+static notmuch_bool_t
+is_duplicate (const search_context_t *ctx, const char *name, const char *addr)
+{
+ notmuch_bool_t duplicate;
+ char *key;
+
+ key = talloc_asprintf (ctx->format, "%s <%s>", name, addr);
+ if (! key)
+ return FALSE;
+
+ duplicate = g_hash_table_lookup_extended (ctx->addresses, key, NULL, NULL);
+
+ if (! duplicate)
+ g_hash_table_insert (ctx->addresses, key, NULL);
+ else
+ talloc_free (key);
+
+ return duplicate;
+}
+