package git

import (

"fmt"

"strconv"

"strings"

"github.com/github/git-sizer/counts"

)

type BatchHeader struct {

OID OID

ObjectType ObjectType

ObjectSize counts.Count32

}

var missingHeader = BatchHeader{

ObjectType: "missing",

}

// Parse a `cat-file --batch[-check]` output header line (including

// the trailing LF). `spec`, if not "", is used in error messages.

func ParseBatchHeader(spec string, header string) (BatchHeader, error) {

header = header[:len(header)-1]

words := strings.Split(header, " ")

if words[len(words)-1] == "missing" {

if spec == "" {

spec = words[0]

}

return missingHeader, fmt.Errorf("missing object %s", spec)

}

oid, err := NewOID(words[0])

if err != nil {

return missingHeader, err

}

size, err := strconv.ParseUint(words[2], 10, 0)

if err != nil {

return missingHeader, err

}

return BatchHeader{

OID: oid,

ObjectType: ObjectType(words[1]),

ObjectSize: counts.NewCount32(size),

}, nil

}