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def parse_version(vstr):

    res = 0

    for n in vstr.split("."):

        res = res * 1000

        res = res + int(n)

    return res

cap_versions = {

    "cmd-watch-del-all": "3.1.1",

    "cmd-watch-project": "3.1",

    "relative_root": "3.3",

    "term-dirname": "3.1",

    "term-idirname": "3.1",

    "wildmatch": "3.7",

}

def check(version, name):

    if name in cap_versions:

        return version >= parse_version(cap_versions[name])

    return False

def synthesize(vers, opts):

    """Synthesize a capability enabled version response

    This is a very limited emulation for relatively recent feature sets

    """

    parsed_version = parse_version(vers["version"])

    vers["capabilities"] = {}

    for name in opts["optional"]:

        vers["capabilities"][name] = check(parsed_version, name)

    for name in opts["required"]:

        have = check(parsed_version, name)

        vers["capabilities"][name] = have

        if not have:

            vers["error"] = (

                "client required capability `"

                + name

                + "` is not supported by this server"

            )

    return vers