1# Copyright 2013 Google Inc.
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met:
7#
8# * Redistributions of source code must retain the above copyright
9#   notice, this list of conditions and the following disclaimer.
10# * Redistributions in binary form must reproduce the above copyright
11#   notice, this list of conditions and the following disclaimer in the
12#   documentation and/or other materials provided with the distribution.
13# * Neither the name of Google Inc. nor the names of its contributors
14#   may be used to endorse or promote products derived from this software
15#   without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29shtk_import cli
30
31
32shtk_bool_check() {
33    local value="${1}"; shift
34
35    case "${value}" in
36        [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1)
37            return 0
38            ;;
39        [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|0)
40            return 1
41            ;;
42        *)
43            [ "${#}" -ne 0 ] || set -- "Invalid boolean value '${value}'"
44            shtk_cli_error "${@}"
45            ;;
46    esac
47}
48