Allow multiple sources for files to check in autoreload

[groves]

I've got a set of data files that I read when my Django app starts, after which I cache them for the rest of the run. I'd like for a change to one of those files to cause the autoreloader to do its thing. To accomplish this, I added a list of source functions to autoreload that are called in turn whenever the autoreloader runs. The functions are expected to return a sequence of files for mtime checking. The initial sources list just contains a function that does the current listing of all files in sys.modules.

This could probably use some documentation, but I don't think anything in autoreload.py itself makes sense. It seems like it'd be more appropriate somewhere user visible on the site, but I'm not sure where that would be exactly. If someone would point me to the right file, I'll happily add some documentation to the patch.

[Jeff Anderson]

sorry, it was me who changed the triage stage. I forgot to log in.

[Alex Gaynor]

Discussion with Carl: this is a pretty uncommon problem, and this (and likely any other solution in Django) will be pretty ugly, adding more global state. Carl notes that you can fix this by putting a fake module in sys.modules, which while heinously ugly, puts it in you *your* project, and not Django.