macで `tree` ツールをインストール

brew install tree
sudo port install tree
fink install tree

インストール終わったら、Directoryにtree実行する

$ tree .

.
├── Dockerfile
├── README.md
├── asset_handler.go
├── default.etcd
│   └── member
│       ├── snap
│       │   ├── 0000000000000002-0000000000004e22.snap
│       │   ├── 0000000000000002-0000000000007533.snap
│       │   ├── 0000000000000002-0000000000009c44.snap
│       │   ├── 0000000000000002-000000000000c355.snap
│       │   └── 0000000000000002-000000000000ea66.snap
│       └── wal
│           ├── 0000000000000002-0000000000004e23.wal
│           ├── 0000000000000003-0000000000007534.wal
│           ├── 0000000000000004-0000000000009c45.wal
│           ├── 0000000000000005-000000000000c356.wal
│           └── 0000000000000006-000000000000ea67.wal
├── main.go
├── modules
│   ├── config
│   │   └── etcd_conf.go
│   ├── database
│   │   ├── aerospikedb.go
│   │   ├── mongodb.go