#!/usr/bin/env python3

# Use sample:
# swh-hashtree --path . --ignore '.svn' --ignore '.git-svn' \
#    --ignore-empty-folders
# 38f8d2c3a951f6b94007896d0981077e48bbd702

import click
import os

from swh.model import from_disk, hashutil


def combine_filters(*filters):
    """Combine several ignore filters"""
    if len(filters) == 0:
        return from_disk.accept_all_directories
    elif len(filters) == 1:
        return filters[0]

    def combined_filter(*args, **kwargs):
        return all(filter(*args, **kwargs) for filter in filters)

    return combined_filter


@click.command()
@click.option("--path", default=".", help="Optional path to hash.")
@click.option(
    "--ignore-empty-folder", is_flag=True, default=False, help="Ignore empty folder."
)
@click.option("--ignore", multiple=True, help="Ignore pattern.")
def main(path, ignore_empty_folder=False, ignore=None):

    filters = []
    if ignore_empty_folder:
        filters.append(from_disk.ignore_empty_directories)
    if ignore:
        filters.append(
            from_disk.ignore_named_directories([os.fsencode(name) for name in ignore])
        )

    try:
        d = from_disk.Directory.from_disk(
            path=os.fsencode(path), dir_filter=combine_filters(*filters)
        )
        hash = d.hash
    except Exception as e:
        print(e)
        return
    else:
        print(hashutil.hash_to_hex(hash))


if __name__ == "__main__":
    main()