add LogOrder, LogOptions.Order, implement Order=LogOrderCommitterTime and Order=LogOrderBSF

Signed-off-by: Saeed Rasooli <saeed.gnu@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/options.go b/options.go
index a87b497..f0c2fd8 100644
--- a/options.go
+++ b/options.go
@@ -307,12 +307,27 @@ func (o *ResetOptions) Validate(r *Repository) error {
 	return nil
 }
 
+type LogOrder int8
+
+const (
+	LogOrderDefault LogOrder = iota
+	LogOrderDFS
+	LogOrderDFSPost
+	LogOrderBSF
+	LogOrderCommitterTime
+)
+
 // LogOptions describes how a log action should be performed.
 type LogOptions struct {
 	// When the From option is set the log will only contain commits
 	// reachable from it. If this option is not set, HEAD will be used as
 	// the default From.
 	From plumbing.Hash
+
+	// The default traversal algorithm is Depth-first search
+	// set Order=LogOrderCommitterTime for ordering by committer time (more compatible with `git log`)
+	// set Order=LogOrderBSF for Breadth-first search
+	Order LogOrder
 }
 
 var (