def find(output_path):
"""
Search for filters that would output the given file.
If one is found, search for one the filter's possible input paths for
the given output path. If there's a match return a tuple of the found
absolute path and the found filter. Otherwise return tuple of (None, None).
Args:
output_path: An absolute path to search for.
Returns
A tuple containing the absolute path to the input file and the filter
instance that would filter it.
>>> find('/path/to/filtered.file')
('/path/to/filterable.file', <SomeFilter instance>)
>>> find('/path/to/unfiltered.file')
(None, None)
"""
filter = filters.find_by_output_path(output_path)
if filter:
for input_path in filter.derive_input_paths(output_path):
full_input_path = finders.find(input_path)
if full_input_path:
return full_input_path, filter
return None, None
def test_find_by_output_path(self):
assert_is_instance(filters.find_by_output_path('main.out'), Filter1)
assert_is_instance(filters.find_by_output_path('main.out2'), Filter2)
assert_equal(None, filters.find_by_output_path('main.in'))
