Created
February 11, 2016 16:41
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Find the full import chain from one go package to another
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#!/usr/bin/env python3 | |
''' | |
Find the full import chain from one go package to another. | |
Usage: | |
import-finder.py source_package target_package | |
This is useful in large codebases to figure out why, for example, the testing package is | |
included in a resulting binary. | |
''' | |
import collections | |
import subprocess | |
import sys | |
import functools | |
@functools.lru_cache(maxsize=10000) | |
def list_imports(package): | |
if package == 'C': | |
return () | |
out = subprocess.check_output(['go', 'list', '-f', '{{range .Imports}}{{.}} {{end}}', package]) | |
imports = out.decode('utf-8').split() | |
return tuple(filter(lambda x: x != '', imports)) | |
nomatch = {} | |
def find_import_chain(start, end): | |
if start in nomatch: | |
return None | |
print("Searching for %s → %s..." % (start, end), file=sys.stderr) | |
if start == end: | |
return collections.deque([start]) | |
imports = list_imports(start) | |
for x in imports: | |
chain = find_import_chain(x, end) | |
if chain is not None: | |
chain.appendleft(start) | |
return chain | |
else: | |
nomatch[start] = True | |
def main(): | |
chain = find_import_chain(sys.argv[1], sys.argv[2]) | |
if chain is not None: | |
print(' → '.join(chain)) | |
if __name__ == "__main__": | |
main() |
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