[TIP] Django template coverage measurement

[Ned Batchelder]

Hi,

I've added support to coverage.py for plugins to support non-Python 
files, and I've written a plugin to measure Django templates.  I'm 
looking for people interested in trying it out in its current alpha-state.

If you'd like to try it, the plugin itself is pip installable: pip 
install django_coverage_plugin . To run it, add these settings to your 
.coveragerc:

    [run]
    # won't be needed eventually
    timid = True

    plugins =
         django_coverage_plugin

Then run your tests under coverage as you normally would.  It requires 
coverage.py>=4.0a2, so it may not work with other coverage-related tools 
if you have them, such as coveralls.io.  You will see your templates 
listed in your coverage report alongside your Python modules (they have 
a .html extension but no directory, that's still to be fixed).

The technique used to measure the coverage is the same that Dmitry 
Trofimov used in dtcov, but integrated into coverage.py, and made more 
performant.  I'd love to see how well it works in a real production 
project.  If you want to help me with, feel free to reply offlist if 
it's more appropriate.

BTW, the coverage.py plugin mechanism is designed to be generally useful 
for hooking into the collection and reporting phases of coverage.py, 
specifically to support non-Python files.  I've also got a plugin for 
Mako templates, but it needs some fixes from Mako. If you have 
non-Python files you'd like to add coverage support for, let's talk.

Thanks,

--Ned.
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