import (
    "github.com/a8m/tree"
)

func main() {
    opts := &tree.Options{
        // Fs, and OutFile are required fields.
        // fs should implement the tree file-system interface(see: tree.Fs),
        // and OutFile should be type io.Writer
        Fs: fs,
        OutFile: os.Stdout,
        // ...
    }
    inf.New("root-dir")
    // Visit all nodes recursively
    inf.Visit(opts)
    // Print nodes 
    inf.Print(opts)
}