#!/usr/bin/env python

"""Test the running system for features availability. Exit with zero

if all features are there, non-zero otherwise. If a feature name is

prefixed with "no-", the absence of feature is tested.

"""

import optparse

import os, sys

import hghave

checks = hghave.checks

def list_features():

    for name, feature in sorted(checks.iteritems()):

        desc = feature[1]

def test_features():

    failed = 0

    for name, feature in checks.iteritems():

        check, _ = feature

        try:

            check()

        except Exception as e:

            failed += 1

    return failed

parser = optparse.OptionParser("%prog [options] [features]")

parser.add_option("--test-features", action="store_true",

                  help="test available features")

parser.add_option("--list-features", action="store_true",

                  help="list available features")

def _loadaddon():

    if 'TESTDIR' in os.environ:

        # loading from '.' isn't needed, because `hghave` should be

        # running at TESTTMP in this case

        path = os.environ['TESTDIR']

    else:

        path = '.'

    if not os.path.exists(os.path.join(path, 'hghaveaddon.py')):

        return

    sys.path.insert(0, path)

    try:

        import hghaveaddon

    except BaseException as inst:

        sys.stderr.write('failed to import hghaveaddon.py from %r: %s\n'

                         % (path, inst))

        sys.exit(2)

    sys.path.pop(0)

if __name__ == '__main__':

    options, args = parser.parse_args()

    _loadaddon()

    if options.list_features:

        list_features()

        sys.exit(0)

    if options.test_features:

        sys.exit(test_features())

    hghave.require(args)