forked from shibukawa/git4go
/
tree.go
189 lines (166 loc) · 4.03 KB
/
tree.go
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package git4go
import (
"errors"
"path/filepath"
)
type Filemode uint32
const (
FilemodeTree Filemode = 0040000
FilemodeBlob Filemode = 0100644
FilemodeBlobExecutable Filemode = 0100755
FilemodeLink Filemode = 0120000
FilemodeCommit Filemode = 0160000
)
func (r *Repository) LookupTree(oid *Oid) (*Tree, error) {
obj, err := objectLookupPrefix(r, oid, GitOidHexSize, ObjectTree)
if obj != nil {
return obj.(*Tree), err
}
return nil, err
}
func (r *Repository) LookupPrefixTree(oid *Oid, length int) (*Tree, error) {
obj, err := objectLookupPrefix(r, oid, length, ObjectTree)
if obj != nil {
return obj.(*Tree), err
}
return nil, err
}
type Tree struct {
gitObject
Entries []*TreeEntry
}
func (t *Tree) Type() ObjectType {
return ObjectTree
}
func (t *Tree) Peel(targetType ObjectType) (Object, error) {
return peel(t, targetType)
}
func (t *Tree) EntryByName(filename string) *TreeEntry {
for _, entry := range t.Entries {
if entry.Name == filename {
return entry
}
}
return nil
}
func (t *Tree) EntryByPath(path string) (*TreeEntry, error) {
return nil, nil
}
func (t *Tree) EntryByIndex(index int) *TreeEntry {
if index < len(t.Entries) {
return t.Entries[index]
}
return nil
}
func (t *Tree) EntryCount() uint64 {
return uint64(len(t.Entries))
}
type TreeWalkCallback func(root string, entry *TreeEntry) int
func (t *Tree) Walk(callback TreeWalkCallback) error {
return treeWalk(t, "", true, callback)
}
func (t *Tree) WalkPost(callback TreeWalkCallback) error {
return treeWalk(t, "", false, callback)
}
func newTree(repo *Repository, oid *Oid, contents []byte) (*Tree, error) {
var entries []*TreeEntry
rawOffset := 0
var name string
for rawOffset < len(contents) {
var attr int64
attr, rawOffset = strtol32(contents, rawOffset, len(contents), 8)
if attr == -1 {
return nil, errors.New("Tree parse error: attribute")
}
for offset := rawOffset; offset < len(contents); offset++ {
if contents[offset] == 0 {
name = string(contents[rawOffset:offset])
rawOffset = offset + 1
break
}
}
if name == "" {
return nil, errors.New("Tree parse error: name")
}
oid := NewOidFromBytes(contents[rawOffset:])
rawOffset += GitOidRawSize
entry := &TreeEntry{
Name: name,
Id: oid,
Type: attr2oType(attr),
Filemode: attr2Filemode(attr),
}
entries = append(entries, entry)
}
return &Tree{
gitObject: gitObject{
repo: repo,
oid: oid,
},
Entries: entries,
}, nil
}
type TreeEntry struct {
Name string
Id *Oid
Type ObjectType
Filemode Filemode
}
func attr2oType(attr int64) ObjectType {
if (attr & 0170000 /* file type mask */) == int64(FilemodeCommit) {
return ObjectCommit
}
if (attr & 0170000 /* file type mask */) == int64(FilemodeTree) {
return ObjectTree
}
return ObjectBlob
}
func attr2Filemode(attr int64) Filemode {
if (attr & 0170000 /* file type mask */) == int64(FilemodeTree) {
return FilemodeTree
}
if (attr & 0111) != 0 {
return FilemodeBlobExecutable
}
if (attr & 0170000 /* file type mask */) == int64(FilemodeCommit) {
return FilemodeCommit
}
if (attr & 0170000 /* file type mask */) == int64(FilemodeLink) {
return FilemodeLink
}
return FilemodeBlob
}
func validFilemode(mode Filemode) bool {
return mode == FilemodeTree || mode == FilemodeBlob ||
mode == FilemodeBlobExecutable || mode == FilemodeLink || mode == FilemodeCommit
}
func treeWalk(t *Tree, root string, pre bool, callback TreeWalkCallback) error {
for _, entry := range t.Entries {
if pre {
result := callback(root, entry)
if result < 0 {
return errors.New("Tree.Walk is aborted")
}
if result > 0 {
continue
}
}
if entry.Type == ObjectTree {
childTree, err := t.repo.LookupTree(entry.Id)
if err != nil {
return err
}
err = treeWalk(childTree, filepath.Join(root, entry.Name), pre, callback)
if err != nil {
return err
}
}
if !pre {
result := callback(root, entry)
if result < 0 {
return errors.New("Tree.Walk is aborted")
}
}
}
return nil
}