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tree.go
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tree.go
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package go4git
import (
"bytes"
"fmt"
"os"
)
type TreeItem struct {
isBlob bool
mode string
name string
hash []byte
}
type Tree struct {
items []TreeItem
}
func (item TreeItem) String() string {
t := "blob"
if item.isBlob == false {
t = "tree"
}
var data bytes.Buffer
for _, dataByte := range item.hash {
data.WriteString(fmt.Sprintf("%.2x", dataByte))
}
return fmt.Sprintf("{%s %s %s %s}", t, item.mode, item.name, data.String())
}
func (tree Tree) String() string {
var treeAsString bytes.Buffer
treeAsString.WriteString("[\n")
for _, item := range tree.items {
treeAsString.WriteString(fmt.Sprintf("%s\n", item))
}
treeAsString.WriteString("]")
return treeAsString.String()
}
func ParseTree(in *os.File) (Tree, error) {
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(in)
if err != nil {
return Tree{}, err
}
_, _, err = parseHeader(buf)
if err != nil {
return Tree{}, err
}
items := []TreeItem{}
for buf.Len() > 0 {
//Read the mode
mode, err := buf.ReadString(' ')
if err != nil {
return Tree{}, err
}
mode = mode[:len(mode)-1]
isBlob := false
if mode[0] == '1' {
isBlob = true
}
//Read the name
name, err := buf.ReadString(0)
if err != nil {
return Tree{}, err
}
//Read the 20 byte hash
hash := buf.Next(20)
treeItem := TreeItem{isBlob: isBlob, mode: mode, hash: hash, name: name}
items = append(items, treeItem)
}
return Tree{items: items}, nil
}