Hi all!
I am pleased to announce that I just released the first working version of pd-fileutils (https://github.com/sebpiq/pd-fileutils) which is a node.js package and a command-line tool for fiddling with pd files.
Right now, the command-line tool only allows you to render .pd files to SVG, but expect more functionalities in the future (I am open to suggestions).
If you know JavaScript and node.js, you can also use the API for scripting operations with your pd files. Right now, it can only parse .pd files to a standard JavaScript object, which you can then manipulate easily with JavaScript.
This library is a by-product of the WebPd project ( https://github.com/sebpiq/WebPd), which aims at running Pure Data patches on the browser.
It is also a proposal for an alternative file format for Pure Data, based on JSON. There was a discussion about that on pd-dev : http://lists.puredata.info/pipermail/pd-dev/2012-06/018436.html and I would like to start it again ;)
Cheers!
Sébastien Piquemal
PS : there will definitely be bugs, so don't "hesitate" to report them :)