casa-mp-base

# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4

#

# Copyright (c) 2012-2015 The MacPorts Project

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# met:

#

# 1. Redistributions of source code must retain the above copyright

#    notice, this list of conditions and the following disclaimer.

# 2. 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.

# 3. Neither the name of The MacPorts Project nor the names of its

#    contributors may be used to endorse or promote products derived from

#    this software without specific prior written permission.

#

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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#

# Usage:

# PortGroup       active_variants 1.1

# if {![catch {set result [active_variants $depspec $required $forbidden]}]} {

#   if {$result} {

#     # code to be executed if $depspec is active with at least all variants in

#     # $required and none from $forbidden

#   } else {

#     # code to be executed if $depspec is active, but either not with all

#     # variants in $required or any variant in $forbidden

#   }

# } else {

#   # code to be executed if $depspec isn't active

# }

#

# where

#  $depspec

#    is the name of the port you're trying to check (required), which can be

#    specified as either just the port, or via "(bin|lib|path):FOO:port"

#    as accepted by the dependency parser.

#  $required

#    is a list of variants that must be enabled for the test to succeed

#    (required; remember this can also be a space-separated string or just

#    a string for a single value. It's interpreted as list, though.)

#  $forbidden

#    is a list of variants that may not be enabled for the test to succeed

#    (default is empty list, see description of $required for values that can be

#    interpreted as list by Tcl)

#

#

# In situations where you know that a version of the port is active (e.g., when

# checking in pre-configure of a port and the checked port is a dependency),

# this can be simplified to: