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+\ Copyright (c) 2003 Scott Long <scottl@FreeBSD.org>
+\ Copyright (c) 2015 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-screen.4th
+
+\ emit Esc-[
+: escc ( -- ) 27 emit [char] [ emit ;
+
+\ Home cursor ( Esc-[H )
+: ho ( -- ) escc [char] H emit ;
+
+\ Clear from current position to end of display ( Esc-[J )
+: cld ( -- ) escc [char] J emit ;
+
+\ clear screen
+: clear ( -- ) ho cld ;
+
+\ move cursor to x rows, y cols (1-based coords) ( Esc-[%d;%dH )
+: at-xy ( x y -- ) escc .# [char] ; emit .# [char] H emit ;
+
+\ Set foreground color ( Esc-[3%dm )
+: fg ( x -- ) escc 3 .# .# [char] m emit ;
+
+\ Set background color ( Esc-[4%dm )
+: bg ( x -- ) escc 4 .# .# [char] m emit ;
+
+\ Mode end (clear attributes)
+: me ( -- ) escc [char] m emit ;
+
+\ Enable bold mode ( Esc-[1m )
+: b ( -- ) escc 1 .# [char] m emit ;
+
+\ Disable bold mode ( Esc-[22m )
+: -b ( -- ) escc 22 .# [char] m emit ;
+
+\ Enable inverse foreground/background mode ( Esc-[7m )
+: inv ( -- ) escc 7 .# [char] m emit ;
+
+\ Disable inverse foreground/background mode ( Esc-[27m )
+: -inv ( -- ) escc 27 .# [char] m emit ;
+
+\ Convert all occurrences of given character (c) in string (c-addr/u) to Esc
+: escc! ( c-addr/u c -- c-addr/u )
+ 2 pick 2 pick
+ begin dup 0> while
+ over c@ 3 pick = if over 27 swap c! then
+ 1- swap 1+ swap
+ repeat
+ 2drop drop
+;