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;; https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
;; Clear the screen better:
;; https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-The-Alternate-Screen-Buffer
(define csi-lead "\x1b[")
(define (str-csi . args)
(apply string-append csi-lead args))
(define (csi-command! . args)
(write-string (apply str-csi args))
(flush-output-port))
; These are xterm things, but they are widely adopted
(define (enable-alternate-buffer!)
(csi-command! "?1049h"))
(define (disable-alternate-buffer!)
(csi-command! "?1049l"))
(define (erase-screen!) (csi-command! "2J"))
(define (move-cursor! x y)
"Also valid with CSI<L>;<C>f being <L> and <C> line number and column
number respectively"
(csi-command! (number->string y) ";" (number->string x) "H"))
(define (echo-char)
(define table (make-piece-table "hola"))
(display "HELO")
(enable-alternate-buffer!)
(let loop ((char (read-char)))
(cond
((char=? #\q char) #f)
(else (piece-table-insert! table 4 "hola" 'normal)
(move-cursor! 0 0)
(erase-screen!)
(write-string (piece-table->string table))
(loop (read-char)))))
(disable-alternate-buffer!))
(define (start arguments)
(with-raw-io (current-input-port) echo-char))
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