'''
directory_discrepancy
=====================

This program compares two directory and shows which files exist in each
directory that do not exist in the other.

> directory_discrepancy dir1 dir2

flags:
--recurse:
    Also check subdirectories.
'''
import os
import argparse
import sys

from voussoirkit import betterhelp
from voussoirkit import pathclass
from voussoirkit import operatornotify
from voussoirkit import spinal
from voussoirkit import vlogging

log = vlogging.getLogger(__name__, 'directory_discrepancy')

def helper(root, recurse):
    root = pathclass.Path(root)
    walk = spinal.walk(root, recurse=recurse, yield_directories=True, yield_files=True)
    for path in walk:
        relative = path.relative_to(root)
        yield relative

def directory_discrepancy_argparse(args):
    files1 = set(helper(args.dir1, recurse=args.recurse))
    files2 = set(helper(args.dir2, recurse=args.recurse))

    print(f'In "{args.dir1}" but not in "{args.dir2}":')
    print('=============================')
    for discrepancy in sorted(files1.difference(files2)):
        print(discrepancy)

    print()

    print(f'In "{args.dir2}" but not in "{args.dir1}":')
    print('=============================')
    for discrepancy in sorted(files2.difference(files1)):
        print(discrepancy)


def main(argv):
    argv = vlogging.set_level_by_argv(log, argv)

    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('dir1')
    parser.add_argument('dir2')
    parser.add_argument('--recurse', action='store_true')
    parser.set_defaults(func=directory_discrepancy_argparse)

    return betterhelp.single_main(argv, parser, __doc__)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))