#!/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 sys

import hghave

checks = hghave.checks

def list_features():

    for name, feature in checks.iteritems():

        desc = feature[1]

        print name + ':', desc

def test_features():

    failed = 0

    for name, feature in checks.iteritems():

        check, _ = feature

        try:

            check()

        except Exception, e:

            print "feature %s failed:  %s" % (name, 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")

parser.add_option("-q", "--quiet", action="store_true",

                  help="check features silently")

if __name__ == '__main__':

    options, args = parser.parse_args()

    if options.list_features:

        list_features()

        sys.exit(0)

    if options.test_features:

        sys.exit(test_features())

    quiet = options.quiet

    failures = 0

    def error(msg):

        global failures

        if not quiet:

            sys.stderr.write(msg + '\n')

        failures += 1

    for feature in args:

        negate = feature.startswith('no-')

        if negate:

            feature = feature[3:]

        if feature not in checks:

            error('skipped: unknown feature: ' + feature)

            sys.exit(2)

        check, desc = checks[feature]

        try:

            available = check()

        except Exception, e:

            error('hghave check failed: ' + feature)

            continue

        if not negate and not available:

            error('skipped: missing feature: ' + desc)

        elif negate and available:

            error('skipped: system supports %s' % desc)

    if failures != 0:

        sys.exit(1)