Fix #22 Use importer callbacks to handle static path prefixes #58
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Instead of import paths, use the importer callback so we can handle static paths prefixes, and possibly also non-filesystem storage. This is more complicated than anticipated, because we have to re-create the fallback mechanisms for handling partials and extensions, and because finders.find ignores prefixes. There is probably room for improvement, especially around the source maps, but this is a start. Note that the test_raw_css_import test had to be changed, because the libsass doesn't seem to use @import when callbacks are used.
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Instead of import paths, use the importer callback so we can handle static paths prefixes, and possibly also non-filesystem storage.
This is more complicated than anticipated, because we have to re-create the fallback mechanisms for handling partials and extensions, and because finders.find ignores prefixes.
There is probably room for improvement, especially around the source maps, but this is a start.
Note that the test_raw_css_import test had to be changed, because the libsass doesn't seem to use @import when callbacks are used.