:
# $Id: mkopt.sh,v 1.11 2017/03/18 21:36:42 sjg Exp $
#
#	@(#) Copyright (c) 2014, Simon J. Gerraty
#
#	This file is provided in the hope that it will
#	be of use.  There is absolutely NO WARRANTY.
#	Permission to copy, redistribute or otherwise
#	use this file is hereby granted provided that 
#	the above copyright notice and this notice are
#	left intact. 
#      
#	Please send copies of changes and bug-fixes to:
#	sjg@crufty.net
#

# handle WITH[OUT]_* options in a manner compatible with
# options.mk and bsd.mkopt.mk in recent FreeBSD

# no need to be included more than once
setglobal _MKOPT_SH = ':'
setglobal _MKOPT_PREFIX = $(_MKOPT_PREFIX:-MK_)

#
# _mk_opt default OPT
#
# Set MK_$OPT
#
# The semantics are simple, if MK_$OPT has no value
# WITHOUT_$OPT results in MK_$OPT=no
# otherwise WITH_$OPT results in MK_$OPT=yes.
# Note WITHOUT_$OPT overrides WITH_$OPT.
#
# For backwards compatability reasons we treat WITH_$OPT=no
# the same as WITHOUT_$OPT.
#
proc _mk_opt {
    setglobal _d = $1
    setglobal _mo = "$(_MKOPT_PREFIX)$2", _wo = "WITHOUT_$2", _wi = "WITH_$2"
    eval "_mov=\$$_mo _wov=\$$_wo _wiv=\$$_wi"

    match $_wiv {
    with [Nn][Oo] setglobal _wov = 'no'
    }
    setglobal _v = $(_mov:-${_wov:+no})
    setglobal _v = $(_v:-${_wiv:+yes})
    setglobal _v = $(_v:-$_d)
    setglobal _opt_list = ""$_opt_list $_mo""
    match $_v {
    with yes|no 			# sane
    with 0|[NnFf]* setglobal _v = 'no'		# they mean no
    with 1|[YyTt]* setglobal _v = 'yes'		# they mean yes
    with * setglobal _v = $_d			# ignore bogus value
    }
    eval "$_mo=$_v"
}

#
# _mk_opts default opt ... [default [opt] ...]
#
# see _mk_opts_defaults for example
#
proc _mk_opts {
    setglobal _d = 'no'
    for _o in [@Argv]
    {
	match $_o {
	with */* # option is dirname default comes from basename
	    eval "_d=\$$(_MKOPT_PREFIX)$(_o#*/)"
	    setglobal _o = $(_o%/*)
	    
	with yes|no setglobal _d = $_o; continue
	}
	_mk_opt $_d $_o
    }
}

# handle either options.mk style OPTIONS_DEFAULT_*
# or FreeBSD's new bsd.mkopt.mk style __DEFAULT_*_OPTIONS
proc _mk_opts_defaults {
    _mk_opts no $OPTIONS_DEFAULT_NO $__DEFAULT_NO_OPTIONS \
	yes $OPTIONS_DEFAULT_YES $__DEFAULT_YES_OPTIONS \
	$OPTIONS_DEFAULT_DEPENDENT $__DEFAULT_DEPENDENT_OPTIONS
}

match "/$0" {
with */mkopt*
    setglobal _list = 'no'
    while :
    {
	match $1 {
	with *=* eval $1; shift
	with --no|no setglobal _list = ""$_list no""; shift
	with --yes|yes setglobal _list = ""$_list yes""; shift
	with -DWITH* eval "$(1#-D)=1"; shift
	with [A-Z]* setglobal _list = ""$_list $1""; shift
	with * break
	}
    }
    _mk_opts $_list
    
}