ipfs object has learned stat

'ipfs object stat' is a plumbing command to print DAG
node statistics. <key> is a base58 encoded multihash.
It outputs to stdout:

  NumLinks        int number of links in link table
  BlockSize       int size of the raw, encoded data
  LinksSize       int size of the links segment
  DataSize        int size of the data segment
  CumulativeSize  int cumulative size of object and references

core/commands/object.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"strings"
@@ -36,6 +37,7 @@ ipfs object get <key>             - Get the DAG node named by <key>
 ipfs object put <data> <encoding> - Stores input, outputs its key
 ipfs object data <key>            - Outputs raw bytes in an object
 ipfs object links <key>           - Outputs links pointed to by object
+ipfs object stat <key>            - Outputs statistics of object
 `,
 	},
 
@@ -44,6 +46,7 @@ ipfs object links <key>           - Outputs links pointed to by object
 		"links": objectLinksCmd,
 		"get":   objectGetCmd,
 		"put":   objectPutCmd,
+		"stat":  objectStatCmd,
 	},
 }
 
@@ -180,6 +183,64 @@ This command outputs data in the following encodings:
 	},
 }
 
+var objectStatCmd = &cmds.Command{
+	Helptext: cmds.HelpText{
+		Tagline: "Get stats for the DAG node named by <key>",
+		ShortDescription: `
+'ipfs object stat' is a plumbing command to print DAG node statistics.
+<key> is a base58 encoded multihash. It outputs to stdout:
+
+	NumLinks        int number of links in link table
+	BlockSize       int size of the raw, encoded data
+	LinksSize       int size of the links segment
+	DataSize        int size of the data segment
+	CumulativeSize  int cumulative size of object and its references
+`,
+	},
+
+	Arguments: []cmds.Argument{
+		cmds.StringArg("key", true, false, "Key of the object to retrieve (in base58-encoded multihash format)"),
+	},
+	Run: func(req cmds.Request) (interface{}, error) {
+		n, err := req.Context().GetNode()
+		if err != nil {
+			return nil, err
+		}
+
+		key := req.Arguments()[0]
+
+		object, err := objectGet(n, key)
+		if err != nil {
+			return nil, err
+		}
+
+		ns, err := object.Stat()
+		if err != nil {
+			return nil, err
+		}
+
+		return ns, nil
+	},
+	Type: dag.NodeStat{},
+	Marshalers: cmds.MarshalerMap{
+		cmds.Text: func(res cmds.Response) (io.Reader, error) {
+			ns := res.Output().(dag.NodeStat)
+
+			var buf bytes.Buffer
+			w := func(s string, n int) {
+				buf.Write([]byte(fmt.Sprintf("%s: %d\n", s, n)))
+			}
+			w("NumLinks", ns.NumLinks)
+			w("BlockSize", ns.BlockSize)
+			w("LinksSize", ns.LinksSize)
+			w("DataSize", ns.DataSize)
+			w("CumulativeSize", ns.CumulativeSize)
+
+			return &buf, nil
+		},
+	},
+}
+
 var objectPutCmd = &cmds.Command{
 	Helptext: cmds.HelpText{
 		Tagline: "Stores input as a DAG object, outputs its key",

merkledag/node.go

@@ -27,10 +27,10 @@ type Node struct {
 // NodeStat is a statistics object for a Node. Mostly sizes.
 type NodeStat struct {
 	NumLinks       int // number of links in link table
-	BlockSize      int // size of the raw data
+	BlockSize      int // size of the raw, encoded data
 	LinksSize      int // size of the links segment
 	DataSize       int // size of the data segment
-	CumulativeSize int // cumulatie size of object + all it references
+	CumulativeSize int // cumulative size of object and its references
 }
 
 func (ns NodeStat) String() string {