freebsd-dev/stand/forth/color.4th

\ Copyright (c) 2011-2013 Devin Teske <dteske@FreeBSD.org>
\ All rights reserved.
\ 
\ Redistribution and use in source and binary forms, with or without
\ modification, are permitted provided that the following conditions
\ are 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.
\ 
\ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
\ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\ ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
\ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\ SUCH DAMAGE.
\ 
\ $FreeBSD$

marker task-color.4th

\ This function returns FALSE if the `loader_color' environment variable is set
\ to NO, no, or 0. It returns TRUE if `loader_color' is set to any other value.
\ If `loader_color' is unset, TRUE is returned (unless booting serial).
\ 
: loader_color? ( -- t )

	s" loader_color" getenv dup -1 <> if
		\ `loader_color' is set.
		\ Check if it is explicitly disabled.
		2dup s" NO" compare-insensitive 0= if
			2drop
			FALSE exit
		then
		2dup s" 0" compare 0= if
			2drop
			FALSE exit
		then
		drop
		\ It is enabled.
		TRUE
	else
		\ `loader_color' is unset.
		\ Default to using color unless serial boot is active.
		drop
		boot_serial? 0=
	then
;