#| -*-Scheme-*-

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    2017, 2018, 2019, 2020, 2021, 2022 Massachusetts Institute of
    Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

MIT/GNU Scheme is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Hard-coded ANSI terminal type for lack of termcap on DOS/NT

(declare (usual-integrations))

(define (make-ansi-terminal-description columns lines)
  (define (get-numstring base-name)
    (or (get-environment-variable (string-append "EDWIN_" base-name))
	(get-environment-variable base-name)))

  (define (valid-mode? color-string)
    (and (string? color-string)
	 (= (string-length color-string) 2)
	 (member (string-ref color-string 0)
		 '(#\3 #\4))
	 (member (string-ref color-string 1)
		 '(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7))))

  (define (invert-mode color-string)
    (make-mode (string (if (eqv? (string-ref color-string 0) #\3)
			   #\4
			   #\3)
		       (string-ref color-string 1))))

  (define (make-mode color-string)
    (or (and (valid-mode? color-string)
	     (string-append ";" color-string))
	""))

  (let ((foregnd (get-numstring "FOREGROUND"))
	(backgnd (get-numstring "BACKGROUND")))
    (let ((full? (not (eq? 'DOS microcode-id/operating-system)))
	  (normal
	   (string-append "\033[0"
			  (make-mode foregnd)
			  (make-mode backgnd)
			  "m"))
	  (standout
	   (if (or (not (valid-mode? foregnd)) (not (valid-mode? backgnd)))
	       (string-append "\033[7"
			      (make-mode foregnd)
			      (make-mode backgnd)
			      "m")
	       (string-append "\033[0"
			      (invert-mode backgnd)
			      (invert-mode foregnd)
			      "m"))))

      (%make-termcap-description
       "ansi.sys"		        ; terminal-type-name
       false				; delete-is-insert-mode?
       false				; enter/exit-standout-mode-same?
       (and full? "\033[P")		; insert/delete-char-ok?
       (and full? "\033[M")		; insert/delete-line-ok?
       false				; scroll-region-ok?
       #t				; tf-automatic-wrap
       false				; tf-cursor-backwards-wrap
       false				; tf-generic
       false				; tf-hardcopy
       false				; tf-hazeltine
       false				; tf-insert-mode-motion
       false				; tf-lose-wrap
       false				; tf-magic-wrap
       false				; tf-memory-above-screen
       false				; tf-memory-below-screen
       false				; tf-meta-key
       false				; tf-must-write-spaces
       false				; tf-newline-doesnt-scroll
       false				; tf-overstrike
       false				; tf-overstrike-space-erase
       false				; tf-overwrite-preserves-standout
       false				; tf-standout-mode-motion
       false				; tf-teleray
       false				; tf-underscore
       false				; tn-memory-lines
       false				; tn-minimum-padding-speed
       false				; tn-standout-marker-width
       columns				; tn-x-size
       lines				; tn-y-size
       "\a"				; ts-audible-bell
       "\033[K"				; ts-clear-line
       false				; ts-clear-multi-char
       "\033[H\033[J"			; ts-clear-screen
       "\033[J"				; ts-clear-to-bottom
       "\n"				; ts-cursor-down
       false				; ts-cursor-down-multi
       "\b"				; ts-cursor-left
       false				; ts-cursor-left-multi
       "\r"				; ts-cursor-line-start
       false				; ts-cursor-lower-left
       "\033[%i%d;%dH"			; ts-cursor-move
       false				; ts-cursor-move-x
       "\033[C"				; ts-cursor-right
       (and full? "\033[%dC")		; ts-cursor-right-multi
       "\033[A"				; ts-cursor-up
       (and full? "\033[%dA")		; ts-cursor-up-multi
       "\033[H"				; ts-cursor-upper-left
       (and full? "\033[P")		; ts-delete-char
       (and full? "\033[M")		; ts-delete-line
       (and full? "\033[%dP")		; ts-delete-multi-char
       (and full? "\033[%dM")		; ts-delete-multi-line
       false				; ts-enhance-cursor
       false				; ts-enter-delete-mode
       false ;"\033[4h"			; ts-enter-insert-mode
       standout;"\033[7m"		; ts-enter-standout-mode
       (and full? "\033[1p")		; ts-enter-termcap-mode
       false				; ts-exit-delete-mode
       false ;"\033[4l"			; ts-exit-insert-mode
       normal;"\033[0m"			; ts-exit-standout-mode
       (and full? "\033[0p")		; ts-exit-termcap-mode
       "\n"				; ts-forward-scroll
       false				; ts-forward-scroll-multi
       (and full? "\033[@")		; ts-insert-char
       (and full? "\033[L")		; ts-insert-line
       (and full? "\033[%d@")		; ts-insert-multi-char
       (and full? "\033[%dL")		; ts-insert-multi-line
       false				; ts-invisible-cursor
       false				; ts-normal-cursor
       false				; ts-pad-char
       false				; ts-pad-inserted-char
       false				; ts-reverse-scroll
       false				; ts-reverse-scroll-multi
       false				; ts-set-scroll-region
       false				; ts-set-scroll-region-1
       false				; ts-set-window
       false				; ts-visible-bell
       '()                              ; termcap-description-keys
       ))))