Terminal control/Inverse video
You are encouraged to solve this task according to the task description, using any language you may know.
The task is to display a word in inverse video (or reverse video) followed by a word in normal video.
AutoHotkey
Call SetConsoleTextAttribute() to change foreground and background colors. <lang AHK>DllCall( "AllocConsole" ) ; create a console if not launched from one hConsole := DllCall( "GetStdHandle", int, STDOUT := -11 )
SetConsoleTextAttribute(hConsole, 0x70) ; gray background, black foreground FileAppend, Reversed`n, CONOUT$ ; print to stdout
SetConsoleTextAttribute(hConsole, 0x07) ; black background, gray foreground FileAppend, Normal, CONOUT$
MsgBox
SetConsoleTextAttribute(hConsole, Attributes){ return DllCall( "SetConsoleTextAttribute", UPtr, hConsole, UShort, Attributes) }</lang>
AWK
<lang awk>BEGIN { system ("tput rev") print "foo" system ("tput sgr0") print "bar" }</lang>
BASIC
Locomotive Basic
The firmware routine at &bb9c (TXT INVERSE) swaps the current Locomotive BASIC PEN and PAPER colors:
<lang locobasic>10 CALL &bb9c:PRINT "inverse"; 20 CALL &bb9c:PRINT "normal"</lang>
ZX Spectrum Basic
<lang basic>10 INVERSE 1 20 PRINT "FOO"; 30 INVERSE 0 40 PRINT "BAR"</lang>
BBC BASIC
<lang bbcbasic> COLOUR 128 : REM Black background
COLOUR 15 : REM White foreground PRINT "Inverse"; COLOUR 128+15 : REM White background COLOUR 0 : REM Black foreground PRINT " video"</lang>
Alternative method using 'VDU code' strings: <lang bbcbasic> inverse$ = CHR$(17)+CHR$(128)+CHR$(17)+CHR$(15)
normal$ = CHR$(17)+CHR$(128+15)+CHR$(17)+CHR$(0) PRINT inverse$ + "Inverse" + normal$ + " video"</lang>
C
<lang C>#include <stdio.h>
int main() { printf("\033[7mReversed\033[m Normal\n");
return 0; }</lang>
J
Use the definitions given in Terminal_control/Coloured_text#J <lang J>
;:';:,#.*."3,(C.A.)/\/&.:;:' NB. some output beforehand attributes REVERSEVIDEO NB. does as it says 2 o.^:a:0 NB. solve the fixed point equation cos(x) == x attributes OFF NB. no more blinky flashy parseFrench=:;:,#.*."3,(C.A.)/\/&.:;: NB. just kidding! More output.
</lang>
Mathematica
<lang Mathematica>Run["tput mr"] Run["echo foo"] (* is displayed in reverse mode *) Run["tput me"] Run["echo bar"]</lang>
OCaml
Using the library ANSITerminal in the interactive loop:
<lang ocaml>$ ocaml unix.cma -I +ANSITerminal ANSITerminal.cma
- open ANSITerminal ;;
- print_string [Inverse] "Hello\n" ;;
Hello - : unit = ()</lang>
PicoLisp
<lang PicoLisp>(prin "abc") (call "tput" "rev") (prin "def") # These three chars are displayed in reverse video (call "tput" "sgr0") (prinl "ghi")</lang>
PureBasic
<lang PureBasic>If OpenConsole()
ConsoleColor(0, 15) ;use the colors black (background) and white (forground) PrintN("Inverse Video") ConsoleColor(15, 0) ;use the colors white (background) and black (forground) PrintN("Normal Video") Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input() CloseConsole()
EndIf</lang>
Python
<lang Python>#!/usr/bin/env python
print "\033[7mReversed\033[m Normal"</lang>
REXX
This version only works with PC/REXX. <lang rexx>/*REXX program to demonstrate reverse video. */ @day = 'day' @night = 'night' call scrwrite , 1, @day, , , 7 /*white on black.*/ call scrwrite , 1+length(@day), @night, , , 112 /*black on white.*/
/*stick a fork in it, we're done.*/</lang>
Run BASIC
<lang runbasic>' ---------- foo is reverse -------------- x$ = shell$("tput mr echo 'foo'")
' ---------- bar is normal -------------- x$ = shell$("tput me echo 'bar'") wait</lang>
Tcl
This only works on Unix terminals. <lang tcl># Get how the terminal wants to do things... set videoSeq(reverse) [exec tput rev] set videoSeq(normal) [exec tput rmso] proc reverseVideo str {
global videoSeq return "$videoSeq(reverse)${str}$videoSeq(normal)"
}
- The things to print
set inReverse "foo" set inNormal "bar"
- Print those words
puts "[reverseVideo $inReverse] $inNormal"</lang>
TPP
<lang tpp>--revon This is inverse --revoff This is normal</lang>
UNIX Shell
Use the tput(1) utility to write the escape sequences that enable or disable reverse video.
<lang bash>#!/bin/sh tput mr # foo is reversed echo 'foo' tput me # bar is normal video echo 'bar'</lang>
If the system supports terminfo, then tput rev
and tput sgr0
also work. (All recent systems have terminfo, except NetBSD, but NetBSD 6 will have terminfo.) The shorter names mr
and me
are the backward-compatible names from termcap.
If the terminal cannot do reverse video, then tput will fail with a message to standard error.
<lang bash>$ TERM=dumb tput mr tput: Unknown terminfo capability `mr'</lang>
Some programs use the standout mode, which might look exactly like reverse video. (The escape sequences might be identical!)
<lang bash>tput so # enter standout mode echo 'foo' tput se # exit standout mode echo 'bar'</lang>
If the system supports terminfo, then tput smso
and tput rmso
also work.
C Shell
<lang csh>tput mr echo 'foo' tput me echo 'bar'</lang>
XPL0
Output device 6 is similar to the normal console screen (device 0), but it provides many combinations of foreground and background colors.
<lang XPL0>include c:\cxpl\codes; [Attrib($70); Text(6, "Inverse"); Attrib($07); Text(6, " Video"); CrLf(6); ]</lang>