move: format/packp -> protocol/packp (#141)

* move: format/packp -> protocol/packp

* format/packp -> protocol/packp
* format/packp/pktline -> format/pktline.

* move: protocol/packp/ulreq/* -> protocol/packp/*

* protocol/packp: rename UlReq types to make them unique.

* * protocol/packp: namespace UlReq encoder.

* protocol/packp: namespace UlReq decoder.

* protocol/packp: fix example names

* move: protocol/packp/advrefs/* -> protocol/packp/*

* further ulreq namespacing

* protocol/packp: namespace AdvRefs types.

1 files changed, 53 insertions, 0 deletions

diff --git a/plumbing/protocol/packp/ulreq.go b/plumbing/protocol/packp/ulreq.go
new file mode 100644
index 0000000..5870001
--- /dev/null
+++ b/plumbing/protocol/packp/ulreq.go
@@ -0,0 +1,53 @@
+package packp
+
+import (
+	"time"
+
+	"gopkg.in/src-d/go-git.v4/plumbing"
+)
+
+// UlReq values represent the information transmitted on a
+// upload-request message.  Values from this type are not zero-value
+// safe, use the New function instead.
+type UlReq struct {
+	Capabilities *Capabilities
+	Wants        []plumbing.Hash
+	Shallows     []plumbing.Hash
+	Depth        Depth
+}
+
+// Depth values stores the desired depth of the requested packfile: see
+// DepthCommit, DepthSince and DepthReference.
+type Depth interface {
+	isDepth()
+}
+
+// DepthCommits values stores the maximum number of requested commits in
+// the packfile.  Zero means infinite.  A negative value will have
+// undefined consecuences.
+type DepthCommits int
+
+func (d DepthCommits) isDepth() {}
+
+// DepthSince values requests only commits newer than the specified time.
+type DepthSince time.Time
+
+func (d DepthSince) isDepth() {}
+
+// DepthReference requests only commits not to found in the specified reference.
+type DepthReference string
+
+func (d DepthReference) isDepth() {}
+
+// NewUlReq returns a pointer to a new UlReq 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.
+func NewUlReq() *UlReq {
+	return &UlReq{
+		Capabilities: NewCapabilities(),
+		Wants:        []plumbing.Hash{},
+		Shallows:     []plumbing.Hash{},
+		Depth:        DepthCommits(0),
+	}
+}