fixup! TB 41803: Add some developer tools for working on tor-browser.

    or "head") that starts with the given 'name_start'.

    """

    if ref_type == "tag":

        # Instead of returning tag hash, return the commit hash it points to.

        fstring = "%(*objectname)"

        ref_start = "refs/tags/"

    elif ref_type == "remote":

        fstring = "%(objectname)"

        ref_start = "refs/remotes/"

    elif ref_type == "head":

        fstring = "%(objectname)"

        ref_start = "refs/heads/"

    else:

        raise TypeError(f"Unknown type {ref_type}")

    fstring = f"{fstring},%(refname)"

    fstring = "%(*objectname),%(objectname),%(refname)"

    pattern = f"{ref_start}{name_start}**"

    def line_to_ref(line):

        [commit, ref_name] = line.split(",", 1)

        return Reference(ref_name.replace(ref_start, "", 1), commit)

        [objectname_reference, objectname, ref_name] = line.split(",", 2)

        # For annotated tags, the objectname_reference is non-empty and points

        # to an actual commit.

        # For remotes, heads and lightweight tags, the objectname_reference will

        # be empty and objectname will point directly to the commit.

        return Reference(

            ref_name.replace(ref_start, "", 1), objectname_reference or objectname

        )

    return [

        line_to_ref(line)

    Return whether the file is a utf-8 text file containing the regular

    expression given by 'regex'.

    """

    with open(filename, "r", encoding="utf-8") as file:

    with open(filename, encoding="utf-8") as file:

        try:

            for line in file:

                if regex.search(line):