Terminal control/Preserve screen: Difference between revisions

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<~~lang~~ 11l>print("\033[?1049h\033[H")

<syntaxhighlight lang="11l">print("\033[?1049h\033[H")

print(‘Alternate buffer!’)

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sleep(1)

print("\033[?1049l")</~~lang~~>

print("\033[?1049l")</syntaxhighlight>

=={{header|Action!}}==

<~~lang~~ ~~Action~~!>PROC Wait(BYTE frames)

<syntaxhighlight lang="action!">PROC Wait(BYTE frames)

BYTE RTCLOK=$14

frames==+RTCLOK

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Wait(200)

MoveBlock(ptr,buffer,size) ;restore screen content

RETURN</~~lang~~>

RETURN</syntaxhighlight>

[https://gitlab.com/amarok8bit/action-rosetta-code/-/raw/master/images/Preserve_screen.png Screenshot from Atari 8-bit computer]

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=={{header|Applesoft BASIC}}==

Restores 40 x 24 TEXT screen, cursor position, display mode, and speed. Adjusts HIMEM to make room to store 1024 bytes aligned to the 256 byte page boundary. POKEs a machine language "copy 4 pages of memory" routine into page 3.

<~~lang~~ ~~ApplesoftBasic~~> 10 LET FF = 255:FE = FF - 1

<syntaxhighlight lang="applesoftbasic"> 10 LET FF = 255:FE = FF - 1

11 LET FD = 253:FC = FD - 1

12 POKE FC, 0 : POKE FE, 0

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61 CALL R : POKE 241, S

62 VTAB V + 1 : HTAB C + 1

63 POKE 50, M : POKE 243, F</~~lang~~>

63 POKE 50, M : POKE 243, F</syntaxhighlight>

=={{header|BBC BASIC}}==

The screen is saved as a bitmap:

<~~lang~~ bbcbasic> PRINT "This is the original screen"

<syntaxhighlight lang="bbcbasic"> PRINT "This is the original screen"

OSCLI "GSAVE """ + @tmp$ + "bbcsave"""

WAIT 200

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PRINT "This is the new screen, following a CLS"

WAIT 200

OSCLI "DISPLAY """ + @tmp$ + "bbcsave"""</~~lang~~>

OSCLI "DISPLAY """ + @tmp$ + "bbcsave"""</syntaxhighlight>

=={{header|Befunge}}==

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Assuming a terminal with support for Xterm's [http://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-The-Alternate-Screen-Buffer ''alternate screen buffer''] escape sequences (which I believe is fairly standard these days), this example will switch to the alternate screen buffer, output "Press <Enter> to restore..." in the top left corner, and then restore the original screen.

<~~lang~~ befunge>"h9401?["39*>:#,_"...erotser ot >retnE< sserPH["39*>:#,_~$"l9401?["39*>:#,_@</~~lang~~>

<syntaxhighlight lang="befunge">"h9401?["39*>:#,_"...erotser ot >retnE< sserPH["39*>:#,_~$"l9401?["39*>:#,_@</syntaxhighlight>

=={{header|C}}==

For Xterm. "Allow alternate screen buffer" must be enabled by the popup menu.<~~lang~~ C>#include <stdio.h>

For Xterm. "Allow alternate screen buffer" must be enabled by the popup menu.<syntaxhighlight lang="c">#include <stdio.h>

#include <unistd.h>

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return 0;

}</~~lang~~>

}</syntaxhighlight>

=={{header|Common Lisp}}==

<~~lang~~ lisp>

(format t "~C[?1049h~C[H" (code-char #O33) (code-char #O33))

(format t "Alternate screen buffer~%")

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))

(format t "~C[?1049l" (code-char #O33))

</syntaxhighlight>

</lang>

==={{header|ncurses}}===

When the ncurses terminal library is used, characters are displayed on an alternate screen of the terminal. Leaving ncurses returns to the original screen buffer with the previous content preserved. To interface ncurses from Lisp, the ''croatoan'' library is used.

<~~lang~~ lisp>(defun clear-test ()

<syntaxhighlight lang="lisp">(defun clear-test ()

;; starting a ncurses screen enters the alternate screen buffer of the terminal

(with-screen (scr :input-echoing nil :input-blocking t)

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(refresh scr)

(get-char scr)))

;; leaving ncurses returns the terminal to the main screen buffer</~~lang~~>

;; leaving ncurses returns the terminal to the main screen buffer</syntaxhighlight>

=={{header|Emacs Lisp}}==

<~~lang~~ lisp>#!/usr/local/bin/emacs --script

<syntaxhighlight lang="lisp">#!/usr/local/bin/emacs --script

;; -*- lexical-binding: t; -*-

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;; "ESC [ ? 1049 l" - Disable alternative screen buffer

(princ "\033[?1049l")</~~lang~~>

(princ "\033[?1049l")</syntaxhighlight>

=={{header|Forth}}==

<~~lang~~ forth>.\" \033[?1049h\033[H" \ preserve screen

<syntaxhighlight lang="forth">.\" \033[?1049h\033[H" \ preserve screen

." Press any key to return" ekey drop

.\" \033[?1049l" \ restore screen</~~lang~~>

.\" \033[?1049l" \ restore screen</syntaxhighlight>

=={{header|FreeBASIC}}==

<~~lang~~ freebasic>'' 640x480x8, with 3 pages

<syntaxhighlight lang="freebasic">'' 640x480x8, with 3 pages

Screen 12,,3

Windowtitle "Terminal control/Preserve screen"

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Next i

Screencopy 1, 0

Sleep</~~lang~~>

Sleep</syntaxhighlight>

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<~~lang~~ go>package main

<syntaxhighlight lang="go">package main

import (

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}

fmt.Print("\033[?1049l")

}</~~lang~~>

}</syntaxhighlight>

=={{header|Java}}==

<~~lang~~ java>public class PreserveScreen

<syntaxhighlight lang="java">public class PreserveScreen

{

public static void main(String[] args) throws InterruptedException {

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System.out.print("\033[?1049l");

}

}</~~lang~~>

}</syntaxhighlight>

=={{header|JavaScript}}==

<~~lang~~ javascript>(function() {

<syntaxhighlight lang="javascript">(function() {

var orig= document.body.innerHTML

document.body.innerHTML= '';

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}, 1000);

})();</~~lang~~>

})();</syntaxhighlight>

This implementation assumes that Javascript is running in the browser.

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=={{header|Julia}}==

<~~lang~~ julia>const ESC = "\u001B" # escape code

<syntaxhighlight lang="julia">const ESC = "\u001B" # escape code

print("$ESC[?1049h$ESC[H")

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print("$ESC[?1049l\n\n\n")

</syntaxhighlight>

</lang>

=={{header|Kotlin}}==

<~~lang~~ scala>// version 1.1.2

<syntaxhighlight lang="scala">// version 1.1.2

const val ESC = "\u001B"

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}

print("$ESC[?1049l")

}</~~lang~~>

}</syntaxhighlight>

=={{header|M2000 Interpreter}}==

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If we change Mode (size of font), or Window size (console witdh/height), or use a Form statement to set character resolution (number characters in a row by row number) which automatic calculate size and line spacing, then saved consoled bitmap erased. To preserve screen from this situation we have to preserve last form's arguments, or window's arguments or mode's argument.

Module PreserveScreen {

Bold 1

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PreserveScreen

</syntaxhighlight>

</lang>

=={{header|Mathematica}}/{{header|Wolfram Language}}==

<~~lang~~ ~~Mathematica~~>Run["tput smcup"] (* Save the display *)

<syntaxhighlight lang="mathematica">Run["tput smcup"] (* Save the display *)

Run["echo Hello"]

Pause[5] (* Wait five seconds *)

Run["tput rmcup"] </~~lang~~>

Run["tput rmcup"] </syntaxhighlight>

=={{header|Nim}}==

<~~lang~~ nim>import os

<syntaxhighlight lang="nim">import os

echo "\e[?1049h\e[H"

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sleep 1000

echo "\e[?1049l"</~~lang~~>

echo "\e[?1049l"</syntaxhighlight>

=={{header|Perl}}==

<~~lang~~ perl>print "\033[?1049h\033[H";

<syntaxhighlight lang="perl">print "\033[?1049h\033[H";

print "Alternate screen buffer\n";

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}

print "\033[?1049l";</~~lang~~>

print "\033[?1049l";</syntaxhighlight>

=={{header|Phix}}==

without js -- (save_text_image, sleep, display_text_image)

sequence s = save_text_image({1,1}, {25,80})

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display_text_image({1,1}, s)

sleep(3)

The following also works fine on linux (but not windows, or under p2js)

without js -- (escape sequences, sleep)

puts(1,"\e[?1049h\e[H")

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end for

puts(1,"\e[?1049l")

=={{header|PicoLisp}}==

<~~lang~~ ~~PicoLisp~~>#!/usr/bin/picolisp /usr/lib/picolisp/lib.l

<syntaxhighlight lang="picolisp">#!/usr/bin/picolisp /usr/lib/picolisp/lib.l

(call 'tput "smcup")

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(call 'tput "rmcup")

(bye)</~~lang~~>

(bye)</syntaxhighlight>

=={{header|Python}}==

Similar to the C example above:

<~~lang~~ ~~Python~~>#!/usr/bin/env python

<syntaxhighlight lang="python">#!/usr/bin/env python

import time

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time.sleep(1)

print "\033[?1049l"</~~lang~~>

print "\033[?1049l"</syntaxhighlight>

=={{header|R}}==

<~~lang~~ R>cat("\033[?1049h\033[H")

<syntaxhighlight lang="r">cat("\033[?1049h\033[H")

cat("Alternate screen buffer\n")

for (i in 5:1) {

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cat("\33[2J")

}

cat("\033[?1049l")</~~lang~~>

cat("\033[?1049l")</syntaxhighlight>

=={{header|Racket}}==

#lang racket

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(flash "Hello world.")

</syntaxhighlight>

</lang>

=={{header|Raku}}==

(formerly Perl 6)

<lang ~~perl6~~>print "\e[?1049h\e[H";

<syntaxhighlight lang="raku" line>print "\e[?1049h\e[H";

say "Alternate buffer!";

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}

print "\e[?1049l";</~~lang~~>

print "\e[?1049l";</syntaxhighlight>

=={{header|REXX}}==

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The   '''CLS'''   (DOS) command is used to clear the terminal screen.

<~~lang~~ rexx>/*REXX program saves the screen contents and also the cursor location, then clears the */

<syntaxhighlight lang="rexx">/*REXX program saves the screen contents and also the cursor location, then clears the */

/*──── screen, writes a half screen of ~~~ lines, and then restores the original screen.*/

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end /*restore*/ /* [↑] writes (restores) SD lines. */

/*stick a fork in it, we're all done. */

call cursor curRow, curCol /*restore the original cursor position.*/</~~lang~~>

call cursor curRow, curCol /*restore the original cursor position.*/</syntaxhighlight>

This REXX program makes use of   '''scrsize'''   BIF which is used to determine the screen size of the terminal (console).

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Uses xterm escape codes.

<~~lang~~ rust>use std::io::{stdout, Write};

<syntaxhighlight lang="rust">use std::io::{stdout, Write};

use std::time::Duration;

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print!("\x1b[?1049l");

}</~~lang~~>

}</syntaxhighlight>

The Rust [https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html inclusive range operator] is used as an iterator from 1 to 5 (inclusive). It is then reversed to count down.

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Similar to the C example above:

<~~lang~~ ~~Scala~~>print("\033[?1049h\033[H")

<syntaxhighlight lang="scala">print("\033[?1049h\033[H")

println("Alternate buffer!")

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}

print("\033[?1049l")</~~lang~~>

print("\033[?1049l")</syntaxhighlight>

=={{header|Sidef}}==

<~~lang~~ ruby>print "\e[?1049h\e[H";

<syntaxhighlight lang="ruby">print "\e[?1049h\e[H";

say "Alternate buffer!";

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}

print "\e[?1049l";</~~lang~~>

print "\e[?1049l";</syntaxhighlight>

=={{header|Swift}}==

<~~lang~~ swift>

public let CSI = ESC+"[" // Control Sequence Introducer

func write(_ text: String...) {

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}

write(CSI,"?1049l") // close alternate screen

</syntaxhighlight>

</lang>

=={{header|Tcl}}==

On Unix terminals only, with the help of <tt>tput</tt>:

<~~lang~~ tcl># A helper to make code more readable

<syntaxhighlight lang="tcl"># A helper to make code more readable

proc terminal {args} {

exec /usr/bin/tput {*}$args >/dev/tty

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gets stdin

# Restore the screen with the "exit_ca_mode" capability, a.k.a. 'rmcup'

terminal rmcup</~~lang~~>

terminal rmcup</syntaxhighlight>

=={{header|UNIX Shell}}==

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<~~lang~~ sh>#!/bin/sh

<syntaxhighlight lang="sh">#!/bin/sh

tput smcup # Save the display

echo 'Hello'

sleep 5 # Wait five seconds

tput rmcup # Restore the display</~~lang~~>

tput rmcup # Restore the display</syntaxhighlight>

=={{header|Wren}}==

<~~lang~~ ecmascript>import "io" for Stdout

<syntaxhighlight lang="ecmascript">import "io" for Stdout

import "timer" for Timer

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Timer.sleep(1000)

}

System.write("\e[?1049l")</~~lang~~>

System.write("\e[?1049l")</syntaxhighlight>

=={{header|XPL0}}==

<~~lang~~ ~~XPL0~~>include c:\cxpl\codes; \intrinsic 'code' declarations

<syntaxhighlight lang="xpl0">include c:\cxpl\codes; \intrinsic 'code' declarations

proc SetPage(P); \Select active display page for video screen

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if ChIn(1) then []; \wait for keystroke

SetPage(0); \restore original, default text screen, page 0

]</~~lang~~>

]</syntaxhighlight>

=={{header|Z80 Assembly}}==

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Using the Amstrad CPC firmware:

<~~lang~~ z80> org $3000

<syntaxhighlight lang="z80"> org $3000

txt_output: equ $bb5a

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ret

text: defm "This is some text. Please press a key.\0"</~~lang~~>

text: defm "This is some text. Please press a key.\0"</syntaxhighlight>

=={{header|zkl}}==

Works in a Mint Linux terminal, switching to the alternate screen buffer, printing a count down message and then switching back.

<~~lang~~ zkl>print("\e[?1049h\e[H");

<syntaxhighlight lang="zkl">print("\e[?1049h\e[H");

println("Alternate screen buffer");

foreach i in ([5..1,-1]){

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Atomic.sleep(1);

}

print("\e[?1049l");</~~lang~~>

print("\e[?1049l");</syntaxhighlight>