Tool to remove unused deps by brute force on bazel. Stolen shamelessly from Andrew Buss

dep_clean.py

#!/usr/bin/env python
import sys
# on osx you want brew install gnu-sed to get gsed
from sh import cp, rm, gsed, bazel, ErrorReturnCode

test_fn = lambda: bazel('build', sys.argv[1])
filename = sys.argv[2]

print "Checking that tests pass before starting"
print test_fn()

cp(filename, filename + '.good')

lines = lambda: open(filename).read().split('\n')
line_num = 0

while line_num < len(lines()):
    line = lines()[line_num].strip()
    # Heuristic to only touch lines that look like dependencies
    if line and line[0] == '"' and line[1] in '@-/':
        print "Trying to remove", line_num, line
        gsed('-i', '%dd'%(line_num+1), filename)
        try:
            print test_fn()
            success = True
        except ErrorReturnCode as e:
            print e
            success = False
        if success:
            print "successful, saving"
            cp(filename, filename + '.good')
        else:
            print "unsuccessful, skipping"
            cp(filename + '.good', filename)
            line_num += 1
    else:
        line_num += 1

rm(filename + '.good')

Thanks, this is great. Simple and straightforward. I made a few tweaks for our purposes.

hmm, I'd like to use this, but it looks like the sh library (installed via pip install sh) doesn't include anything called gsed:

Traceback (most recent call last):
  File "../dep_clean.py", line 4, in <module>
    from sh import cp, rm, gsed, bazel, ErrorReturnCode
ImportError: cannot import name 'gsed' from 'sh' (/home/michael/work/techlabs/ve/lib/python3.8/site-packages/sh.py)

did you see: # on osx you want brew install gnu-sed to get gsed?

you could possible change the script to use sed on linux.

yup, gave that a try, but the sh python library doesn't have a sed method either unfortunately.