php - ASCII Library for Creating "Pretty" Directory Trees? -

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Is there a * nix tool or perl / php library that will easily create directory tree visualization that will look like the following?

www - Private | | - app | | | - php | | | | - square | | | + - Script | | | - Settings | | + - SQL | + - Lib | + - ZendFramework-HEAD + - Public - CSS | - Picture + - Script

From this example: 

  LS-R | Grep ": $" | Sed -e's /: $ // '-e' s / [^ -] [^ \ /] * \ // - / g '-e' s / ^ / / '-e' / - / | / '

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