Chord.rb

Chord.rb is an open-source chord rendering library written in Ruby and RMagick. Originally written for Ukulele/Tom, it should become a general-purpose library for chord rendering.

The original source for Chord.rb is GD-Tab-Ukulele, a Perl module which interacts with GD. I wrote Ukulele/Tom in Ruby with Sinatra, and don't enjoy working with GD, so I wrote an alternative which works with an ImageMagick backend.

On Ukulele/Tom, the code operates as such:

1. An image tag <img src='/chord/A' />
2. The controller at /chord/A redirects (with HTTP 200) to the chord image file (served by Nginx if it exists
3. Otherwise, generate the file, and then redirect to the finished image.