ASCII Library for Creating “Pretty” Directory Trees?

Question

Is there some *nix tool or perl/php library that will let you easily create directory tree visualizations that look like the following?

www
|-- private
|             


        

Answer 1

exa with --tree does an excellent job:

exa --tree ~/tmp/public/


├── aboutme
│  └── index.html
├── atrecurse
│  └── index.html
├── base.css
├── html5
│  ├── cat-and-mouse
│  └── frantic
│     ├── css
│     │  └── main.css