#!/usr/bin/env python

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

if all features are there, non-zero otherwise.

"""

import optparse

import os

import sys

def has_symlink():

    return hasattr(os, "symlink")

checks = {

    "symlink": (has_symlink, "symbolic links"),

}

def list_features():

    for name, feature in checks.iteritems():

        desc = feature[1]

        print name + ':', desc

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

    quiet = options.quiet

    failures = 0

    def error(msg):

        global failures

        if not quiet:

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

        failures += 1

    for feature in args:

        if feature not in checks:

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

            continue

        check, desc = checks[feature]       

        if not check():

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

    if failures != 0:

        sys.exit(1)