1 files changed, 49 insertions, 0 deletions
diff --git a/worktree.go b/worktree.go
new file mode 100644
index 0000000..2aefa76
--- /dev/null
+++ b/worktree.go
@@ -0,0 +1,49 @@
+package git
+
+import (
+	"io"
+	"os"
+
+	"gopkg.in/src-d/go-git.v4/plumbing"
+	"gopkg.in/src-d/go-git.v4/plumbing/object"
+
+	"srcd.works/go-billy.v1"
+)
+
+type Worktree struct {
+	r  *Repository
+	fs billy.Filesystem
+}
+
+func (w *Worktree) Checkout(commit plumbing.Hash) error {
+	c, err := w.r.Commit(commit)
+	if err != nil {
+		return err
+	}
+
+	files, err := c.Files()
+	if err != nil {
+		return err
+	}
+
+	return files.ForEach(w.checkoutFile)
+}
+
+func (w *Worktree) checkoutFile(f *object.File) error {
+	from, err := f.Reader()
+	if err != nil {
+		return err
+	}
+
+	defer from.Close()
+	to, err := w.fs.OpenFile(f.Name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode)
+	if err != nil {
+		return err
+	}
+
+	if _, err := io.Copy(to, from); err != nil {
+		return err
+	}
+
+	return to.Close()
+}