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import re

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)

    failed = False

    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