protocol/packp: UploadPackResponse implementation (#161)

* plumbing/protocol: paktp avoid duplication of haves, wants and shallow

* protocol/pakp: UploadPackResponse implementation

* changes

* changes

* changes

* debug

* changes

1 files changed, 13 insertions, 0 deletions

diff --git a/plumbing/protocol/packp/ulreq.go b/plumbing/protocol/packp/ulreq.go
index 254e85e..d57c3fc 100644
--- a/plumbing/protocol/packp/ulreq.go
+++ b/plumbing/protocol/packp/ulreq.go
@@ -25,6 +25,7 @@ type UploadRequest struct {
 // DepthCommit, DepthSince and DepthReference.
 type Depth interface {
 	isDepth()
+	IsZero() bool
 }
 
 // DepthCommits values stores the maximum number of requested commits in
@@ -34,16 +35,28 @@ type DepthCommits int
 
 func (d DepthCommits) isDepth() {}
 
+func (d DepthCommits) IsZero() bool {
+	return d == 0
+}
+
 // DepthSince values requests only commits newer than the specified time.
 type DepthSince time.Time
 
 func (d DepthSince) isDepth() {}
 
+func (d DepthSince) IsZero() bool {
+	return time.Time(d).IsZero()
+}
+
 // DepthReference requests only commits not to found in the specified reference.
 type DepthReference string
 
 func (d DepthReference) isDepth() {}
 
+func (d DepthReference) IsZero() bool {
+	return string(d) == ""
+}
+
 // NewUploadRequest returns a pointer to a new UploadRequest value, ready to be
 // used. It has no capabilities, wants or shallows and an infinite depth. Please
 // note that to encode an upload-request it has to have at least one wanted hash.