finders.py

from compressor.filters import CompilerFilter

class CoffeeCompilerFinder(staticfiles.finders.AppDirectoriesFinder):
    """
    A quick hacked up staticfiles-finder that will automatically recompile .coffee files to .js and serve the .js file
    It will respond to a request for /foo/bar/baz.js and if the coffee-file with the same name in that same dir is newer then
    then js-file requested then the js-file will be recompiled.
    I did this to not have to manually recompile my scripts or use the watcher and still be compatible with require.js
    without have to change the code once i deploy with compiled js-files. it depends on django-compressor at the moment
    but if you dont use that its just a small class to lift out from it.

    usage:

    STATICFILES_FINDERS = (
        'myapp.finders.CoffeeCompilerFinder',
        'django.contrib.staticfiles.finders.FileSystemFinder',
        'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    )

    include this finder *before* the default one else it will serve already compiled js!
    """

    def find(self, path, all=False):

        if not settings.DEBUG:
            return []

        matches = []
        fname, orig_ext = os.path.splitext(path)
        precompile_name = "%s.coffee" % (fname)
        for app in self.apps:
            match = self.find_in_app(app, precompile_name)
            if match:
                f_out, temp_ext = os.path.splitext(match)
                match_outfile = "%s%s" % (f_out, orig_ext)
                try:
                    if not os.path.exists(match_outfile) or os.path.getmtime(match) > os.path.getmtime(match_outfile):
                        CompilerFilter(content="", command='coffee --compile {infile}', filename=match).input()
                    return match_outfile
                except Exception as e:
                    return []
        return matches