+static void parse_cmd_start(struct ref_transaction *transaction,
+ const char *next, const char *end)
+{
+ if (*next != line_termination)
+ die("start: extra input: %s", next);
+ puts("start: ok");
+}
+
+static void parse_cmd_prepare(struct ref_transaction *transaction,
+ const char *next, const char *end)
+{
+ struct strbuf error = STRBUF_INIT;
+ if (*next != line_termination)
+ die("prepare: extra input: %s", next);
+ if (ref_transaction_prepare(transaction, &error))
+ die("prepare: %s", error.buf);
+ puts("prepare: ok");
+}
+
+static void parse_cmd_abort(struct ref_transaction *transaction,
+ const char *next, const char *end)
+{
+ struct strbuf error = STRBUF_INIT;
+ if (*next != line_termination)
+ die("abort: extra input: %s", next);
+ if (ref_transaction_abort(transaction, &error))
+ die("abort: %s", error.buf);
+ puts("abort: ok");
+}
+
+static void parse_cmd_commit(struct ref_transaction *transaction,
+ const char *next, const char *end)
+{
+ struct strbuf error = STRBUF_INIT;
+ if (*next != line_termination)
+ die("commit: extra input: %s", next);
+ if (ref_transaction_commit(transaction, &error))
+ die("commit: %s", error.buf);
+ puts("commit: ok");
+ ref_transaction_free(transaction);
+}
+
+enum update_refs_state {
+ /* Non-transactional state open for updates. */
+ UPDATE_REFS_OPEN,
+ /* A transaction has been started. */
+ UPDATE_REFS_STARTED,
+ /* References are locked and ready for commit */
+ UPDATE_REFS_PREPARED,
+ /* Transaction has been committed or closed. */
+ UPDATE_REFS_CLOSED,
+};
+
+static const struct parse_cmd {
+ const char *prefix;
+ void (*fn)(struct ref_transaction *, const char *, const char *);
+ unsigned args;
+ enum update_refs_state state;
+} command[] = {
+ { "update", parse_cmd_update, 3, UPDATE_REFS_OPEN },
+ { "create", parse_cmd_create, 2, UPDATE_REFS_OPEN },
+ { "delete", parse_cmd_delete, 2, UPDATE_REFS_OPEN },
+ { "verify", parse_cmd_verify, 2, UPDATE_REFS_OPEN },
+ { "option", parse_cmd_option, 1, UPDATE_REFS_OPEN },
+ { "start", parse_cmd_start, 0, UPDATE_REFS_STARTED },
+ { "prepare", parse_cmd_prepare, 0, UPDATE_REFS_PREPARED },
+ { "abort", parse_cmd_abort, 0, UPDATE_REFS_CLOSED },
+ { "commit", parse_cmd_commit, 0, UPDATE_REFS_CLOSED },
+};
+