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package git
import (
"bufio"
"errors"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"gopkg.in/src-d/go-git.v2/core"
)
// Tree is basically like a directory - it references a bunch of other trees
// and/or blobs (i.e. files and sub-directories)
type Tree struct {
Entries map[string]TreeEntry
Hash core.Hash
r *Repository
}
// TreeEntry represents a file
type TreeEntry struct {
Name string
Mode os.FileMode
Hash core.Hash
}
// New errors defined by this package.
var ErrFileNotFound = errors.New("file not found")
// File returns the hash of the file identified by the `path` argument.
// The path is interpreted as relative to the tree receiver.
func (t *Tree) File(path string) (*File, error) {
hash, err := t.findHash(path)
if err != nil {
return nil, ErrFileNotFound
}
obj, err := t.r.Storage.Get(*hash)
if err != nil {
if err == core.ObjectNotFoundErr {
return nil, ErrFileNotFound // a git submodule
}
return nil, err
}
if obj.Type() != core.BlobObject {
return nil, ErrFileNotFound // a directory
}
blob := &Blob{}
blob.Decode(obj)
return &File{Name: path, Reader: blob.Reader(), Hash: *hash}, nil
}
func (t *Tree) findHash(path string) (*core.Hash, error) {
pathParts := strings.Split(path, "/")
var tree *Tree
var err error
for tree = t; len(pathParts) > 1; pathParts = pathParts[1:] {
if tree, err = tree.dir(pathParts[0]); err != nil {
return nil, err
}
}
entry, err := tree.entry(pathParts[0])
if err != nil {
return nil, err
}
return &entry.Hash, nil
}
var errDirNotFound = errors.New("directory not found")
func (t *Tree) dir(baseName string) (*Tree, error) {
entry, err := t.entry(baseName)
if err != nil {
return nil, errDirNotFound
}
obj, err := t.r.Storage.Get(entry.Hash)
if err != nil {
if err == core.ObjectNotFoundErr { // git submodule
return nil, errDirNotFound
}
return nil, err
}
if obj.Type() != core.TreeObject {
return nil, errDirNotFound // a file
}
tree := &Tree{r: t.r}
tree.Decode(obj)
return tree, nil
}
var errEntryNotFound = errors.New("entry not found")
func (t *Tree) entry(baseName string) (*TreeEntry, error) {
entry, ok := t.Entries[baseName]
if !ok {
return nil, errEntryNotFound
}
return &entry, nil
}
func (t *Tree) Files() chan *File {
ch := make(chan *File, 1)
go func() {
defer func() { close(ch) }()
t.walkEntries("", ch)
}()
return ch
}
func (t *Tree) walkEntries(base string, ch chan *File) {
for _, entry := range t.Entries {
obj, err := t.r.Storage.Get(entry.Hash)
if err != nil {
if err == core.ObjectNotFoundErr {
continue // ignore entries without hash (= submodule dirs)
}
//FIXME: Refactor this function to return an error. Ideally this would be
// moved into a FileIter type.
}
if obj.Type() == core.TreeObject {
tree := &Tree{r: t.r}
tree.Decode(obj)
tree.walkEntries(filepath.Join(base, entry.Name), ch)
continue
}
blob := &Blob{}
blob.Decode(obj)
ch <- &File{Name: filepath.Join(base, entry.Name), Reader: blob.Reader(), Hash: entry.Hash}
}
}
// Decode transform an core.Object into a Tree struct
func (t *Tree) Decode(o core.Object) error {
t.Hash = o.Hash()
if o.Size() == 0 {
return nil
}
t.Entries = make(map[string]TreeEntry)
r := bufio.NewReader(o.Reader())
for {
mode, err := r.ReadString(' ')
if err != nil {
if err == io.EOF {
break
}
return err
}
fm, err := strconv.ParseInt(mode[:len(mode)-1], 8, 32)
if err != nil && err != io.EOF {
return err
}
name, err := r.ReadString(0)
if err != nil && err != io.EOF {
return err
}
var hash core.Hash
_, err = r.Read(hash[:])
if err != nil && err != io.EOF {
return err
}
baseName := name[:len(name)-1]
t.Entries[baseName] = TreeEntry{
Hash: hash,
Mode: os.FileMode(fm),
Name: baseName,
}
}
return nil
}
type TreeIter struct {
core.ObjectIter
r *Repository
}
func NewTreeIter(r *Repository, iter core.ObjectIter) *TreeIter {
return &TreeIter{iter, r}
}
func (iter *TreeIter) Next() (*Tree, error) {
obj, err := iter.ObjectIter.Next()
if err != nil {
return nil, err
}
tree := &Tree{r: iter.r}
return tree, tree.Decode(obj)
}
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