Bug 398109

Description Mark Macdonald 2013-01-14 12:56:47 EST

The Orionode code currently depends on the Promised-IO library [1]. We should look at removing this dependency. Here's a list of what we're using from it:

1. Deferred(), all()
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Orion has perfectly good implementations of these in Deferred.js. We should use them instead.

2. Promised-based Node filesystem API
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As an experiment, I've written a standalone npm module [1] that reflects Node's built-in "fs" library into a Deferred-based API using Orion's Deferred. We can use this instead of promised-io/fs.

3. Sequential promise generation
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Promised-IO provides "seq()" which allows several promises to be executed in sequence by invoking an array of generator functions. This comes in handy for async tasks that need to run in a particular order (like much of the build). Should investigate writing a replacement for this (ideally based on a Promises/* spec if one exists for higher-level async operations).

[1] https://npmjs.org/package/promised-io
[2] https://npmjs.org/package/deferred-fs