#!/usr/bin/env python3

# pylint: disable=missing-function-docstring
# pylint: disable=missing-module-docstring

import json
import re
import sys


def main(unused_argv=None):
    # https://github.com/aoldershaw/git-branches-resource
    # see branches.json
    # JSON array of objects containing the field 'name'
    input_obj = json.load(sys.stdin)

    all_branches  = [b.get("name") for b in input_obj]

    topic_branches = [name for name in all_branches
                      if name not in ("main", "master", "plumbing")]

    output_obj = [{"name": name, "tag": tag_from_branch(name)}
                  for name in topic_branches]

    json.dump(output_obj, sys.stdout)


PAT_UNSAFE_TAG       = re.compile(r"[^0-9a-zA-Z.-]", flags=re.ASCII)
PAT_HYPHEN_MINUS_RUN = re.compile(r"--+")

def tag_from_branch(branch):
    return patsubsts(branch, ((PAT_UNSAFE_TAG, "-"),
                              (PAT_HYPHEN_MINUS_RUN, "-")))


def patsubsts(s, patsubs):
    for pat, sub in patsubs:
        s = pat.sub(sub, s)
    return s


if __name__ == "__main__":
    sys.exit(main(sys.argv))