bisect: add enum to represent bisect returning codes

Since we want to get rid of git-bisect.sh, it would be necessary to
convert those exit() calls to return statements so that errors can be
reported.

Create an enum called `bisect_error` with the bisecting return codes
to use in `bisect.c` libification process.

Change bisect_next_all() to make it return this enum.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Miriam Rubio <mirucam@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/bisect.h b/bisect.h
index 4e69a11ea8..c921ead02c 100644
--- a/bisect.h
+++ b/bisect.h
@@ -31,7 +31,19 @@ struct rev_list_info {
 	const char *header_prefix;
 };
 
-int bisect_next_all(struct repository *r,
+/*
+ * enum bisect_error represents the following return codes:
+ * BISECT_OK: success code. Internally, it means that next
+ * commit has been found (and possibly checked out) and it
+ * should be tested.
+ * BISECT_FAILED error code: default error code.
+ */
+enum bisect_error {
+	BISECT_OK = 0,
+	BISECT_FAILED = -1
+};
+
+enum bisect_error bisect_next_all(struct repository *r,
 		    const char *prefix,
 		    int no_checkout);