/r2/r2/config/rewrites.py

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import re

rewrites = (#these first two rules prevent the .embed rewrite from
            #breaking other js that should work
            ("\A/_(.*)", "/_$1"),
            ("\A/static/(.*\.js)", "/static/$1"),
            #This next rewrite makes it so that all the embed stuff works.
            ("\A(.*)(?<!button)(?<!buttonlite)(\.js)\Z", "$1.embed"))

rewrites = tuple((re.compile(r[0]), r[1]) for r in rewrites)