view hgext/fsmonitor/pywatchman/capabilities.py @ 47859:155a2ec8a9dc

merge with stable

# Copyright 2015 Facebook, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#  * Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#
#  * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
#  * Neither the name Facebook nor the names of its contributors may be used to
#    endorse or promote products derived from this software without specific
#    prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# no unicode literals
from __future__ import absolute_import, division, print_function


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