shallow: extract a header file for shallow-related functions

There are many functions in commit.h that are more related to shallow
repositories than they are to any sort of generic commit machinery.
Likely this began when there were only a few shallow-related functions,
and commit.h seemed a reasonable enough place to put them.

But, now there are a good number of shallow-related functions, and
placing them all in 'commit.h' doesn't make sense.

This patch extracts a 'shallow.h', which takes all of the declarations
from 'commit.h' for functions which already exist in 'shallow.c'. We
will bring the remaining shallow-related functions defined in 'commit.c'
in a subsequent patch.

For now, move only the ones that already are implemented in 'shallow.c',
and update the necessary includes.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/shallow.h b/shallow.h
new file mode 100644
index 0000000000..b50a85ed7e
--- /dev/null
+++ b/shallow.h
@@ -0,0 +1,64 @@
+#ifndef SHALLOW_H
+#define SHALLOW_H
+
+#include "lockfile.h"
+#include "object.h"
+#include "repository.h"
+#include "strbuf.h"
+
+void set_alternate_shallow_file(struct repository *r, const char *path, int override);
+int register_shallow(struct repository *r, const struct object_id *oid);
+int unregister_shallow(const struct object_id *oid);
+int is_repository_shallow(struct repository *r);
+int commit_shallow_file(struct repository *r, struct lock_file *lk);
+void rollback_shallow_file(struct repository *r, struct lock_file *lk);
+
+struct commit_list *get_shallow_commits(struct object_array *heads,
+					int depth, int shallow_flag, int not_shallow_flag);
+struct commit_list *get_shallow_commits_by_rev_list(
+		int ac, const char **av, int shallow_flag, int not_shallow_flag);
+int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
+			  const struct oid_array *extra);
+
+void setup_alternate_shallow(struct lock_file *shallow_lock,
+			     const char **alternate_shallow_file,
+			     const struct oid_array *extra);
+
+const char *setup_temporary_shallow(const struct oid_array *extra);
+
+void advertise_shallow_grafts(int);
+
+#define PRUNE_SHOW_ONLY 1
+#define PRUNE_QUICK 2
+void prune_shallow(unsigned options);
+
+/*
+ * Initialize with prepare_shallow_info() or zero-initialize (equivalent to
+ * prepare_shallow_info with a NULL oid_array).
+ */
+struct shallow_info {
+	struct oid_array *shallow;
+	int *ours, nr_ours;
+	int *theirs, nr_theirs;
+	struct oid_array *ref;
+
+	/* for receive-pack */
+	uint32_t **used_shallow;
+	int *need_reachability_test;
+	int *reachable;
+	int *shallow_ref;
+	struct commit **commits;
+	int nr_commits;
+};
+
+void prepare_shallow_info(struct shallow_info *, struct oid_array *);
+void clear_shallow_info(struct shallow_info *);
+void remove_nonexistent_theirs_shallow(struct shallow_info *);
+void assign_shallow_commits_to_refs(struct shallow_info *info,
+				    uint32_t **used,
+				    int *ref_status);
+int delayed_reachability_test(struct shallow_info *si, int c);
+
+extern struct trace_key trace_shallow;
+
+#endif /* SHALLOW_H */