1 files changed, 64 insertions, 0 deletions
diff --git a/modules/git/tree.go b/modules/git/tree.go
new file mode 100644
index 00000000..1da4a9fa
--- /dev/null
+++ b/modules/git/tree.go
@@ -0,0 +1,64 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"bytes"
+	"strings"
+)
+
+// NewTree create a new tree according the repository and tree id
+func NewTree(repo *Repository, id ObjectID) *Tree {
+	return &Tree{
+		ID:   id,
+		repo: repo,
+	}
+}
+
+// SubTree get a sub tree by the sub dir path
+func (t *Tree) SubTree(rpath string) (*Tree, error) {
+	if len(rpath) == 0 {
+		return t, nil
+	}
+
+	paths := strings.Split(rpath, "/")
+	var (
+		err error
+		g   = t
+		p   = t
+		te  *TreeEntry
+	)
+	for _, name := range paths {
+		te, err = p.GetTreeEntryByPath(name)
+		if err != nil {
+			return nil, err
+		}
+
+		g, err = t.repo.getTree(te.ID)
+		if err != nil {
+			return nil, err
+		}
+		g.ptree = p
+		p = g
+	}
+	return g, nil
+}
+
+// LsTree checks if the given filenames are in the tree
+func (repo *Repository) LsTree(ref string, filenames ...string) ([]string, error) {
+	cmd := NewCommand(repo.Ctx, "ls-tree", "-z", "--name-only").
+		AddDashesAndList(append([]string{ref}, filenames...)...)
+
+	res, _, err := cmd.RunStdBytes(&RunOpts{Dir: repo.Path})
+	if err != nil {
+		return nil, err
+	}
+	filelist := make([]string, 0, len(filenames))
+	for _, line := range bytes.Split(res, []byte{'\000'}) {
+		filelist = append(filelist, string(line))
+	}
+
+	return filelist, err
+}