reflog: libify delete reflog function and helpers

Currently stash shells out to reflog in order to delete refs. In an
effort to reduce how much we shell out to a subprocess, libify the
functionality that stash needs into reflog.c.

Add a reflog_delete function that is pretty much the logic in the while
loop in builtin/reflog.c cmd_reflog_delete(). This is a function that
builtin/reflog.c and builtin/stash.c can both call.

Also move functions needed by reflog_delete and export them.

Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/reflog.h b/reflog.h
new file mode 100644
index 0000000..d2906fb
--- /dev/null
+++ b/reflog.h
@@ -0,0 +1,43 @@
+#ifndef REFLOG_H
+#define REFLOG_H
+#include "refs.h"
+
+struct cmd_reflog_expire_cb {
+	int stalefix;
+	int explicit_expiry;
+	timestamp_t expire_total;
+	timestamp_t expire_unreachable;
+	int recno;
+};
+
+struct expire_reflog_policy_cb {
+	enum {
+		UE_NORMAL,
+		UE_ALWAYS,
+		UE_HEAD
+	} unreachable_expire_kind;
+	struct commit_list *mark_list;
+	unsigned long mark_limit;
+	struct cmd_reflog_expire_cb cmd;
+	struct commit *tip_commit;
+	struct commit_list *tips;
+	unsigned int dry_run:1;
+};
+
+int reflog_delete(const char *rev, enum expire_reflog_flags flags,
+		  int verbose);
+void reflog_expiry_cleanup(void *cb_data);
+void reflog_expiry_prepare(const char *refname, const struct object_id *oid,
+			   void *cb_data);
+int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
+			     const char *email, timestamp_t timestamp, int tz,
+			     const char *message, void *cb_data);
+int count_reflog_ent(struct object_id *ooid, struct object_id *noid,
+		     const char *email, timestamp_t timestamp, int tz,
+		     const char *message, void *cb_data);
+int should_expire_reflog_ent_verbose(struct object_id *ooid,
+				     struct object_id *noid,
+				     const char *email,
+				     timestamp_t timestamp, int tz,
+				     const char *message, void *cb_data);
+#endif /* REFLOG_H */