Terminal control/Coloured text

From Rosetta Code
< Terminal control
Revision as of 13:02, 31 July 2012 by rosettacode>Gerard Schildberger (→‎{{header|REXX}}: corrected thumbnail filetype. -- ~~~~)
Terminal control/Coloured text is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

The task is to display a word in various colours on the terminal. The system palette, or colours such as Red, Green, Blue, Magenta, Cyan, and Yellow can be used.

Optionally demonstrate:

  • How the system should determine if the terminal supports colour
  • Setting of the background colour
  • How to cause blinking or flashing (if supported by the terminal)

AutoHotkey

AutoHotkey is not written for the command line, so we need to use the WinAPI directly. For simplicity, this example demonstrates only the foreground colours. <lang AHK>DllCall( "AllocConsole" ) ; create a console if not launched from one hConsole := DllCall( "GetStdHandle", int, STDOUT := -11 ) Loop 15 SetConsoleTextAttribute(hConsole, A_Index) ,WriteConsole(hConsole, "AutoHotkey`n")

MsgBox

SetConsoleTextAttribute(hConsole, Attributes){ return DllCall( "SetConsoleTextAttribute", UPtr, hConsole, UShort, Attributes) } WriteConsole(hConsole, text){ VarSetCapacity(out, 16) If DllCall( "WriteConsole", UPtr, hConsole, Str, text, UInt, StrLen(text) , UPtrP, out, uint, 0 ) return out return 0 }</lang>

BASIC

Works with: QBasic

<lang qbasic>FOR n = 1 TO 15 

   COLOR n
   PRINT "Rosetta Code"

NEXT</lang>

C

On a terminal that understands ANSI escape sequences, such as color xterm, this shows you some annoyingly huge, annoyingly colorful tables. <lang c>#include <stdio.h>

void table(char *title, char *mode) { int f, b; printf("\n\033[1m%s\033[m\n bg\t fg\n", title); for (b = 40; b <= 107; b++) { if (b == 48) b = 100; printf("%3d\t\033[%s%dm", b, mode, b); for (f = 30; f <= 97; f++) { if (f == 38) f = 90; printf("\033[%dm%3d ", f, f); } puts("\033[m"); } }

int main(void) { int fg, bg, blink, inverse;

table("normal ( ESC[22m or ESC[m )", "22;"); table("bold ( ESC[1m )", "1;"); table("faint ( ESC[2m ), not well supported", "2;"); table("italic ( ESC[3m ), not well supported", "3;"); table("underline ( ESC[4m ), support varies", "4;"); table("blink ( ESC[5m )", "5;"); table("inverted ( ESC[7m )", "7;"); return 0; }</lang>

Mathematica

Delegating to tput on terminal enabled OS(Mac Os, Linux) <lang Mathematica>Run["tput setaf 1"]; Print["Coloured Text"]; Run["tput setaf 2"]; Print["Coloured Text"]; Run["tput setaf 3"]; Print["Coloured Text"]</lang>

OCaml

Using the library ANSITerminal in the interactive loop:

<lang ocaml>$ ocaml unix.cma -I +ANSITerminal ANSITerminal.cma

  1. open ANSITerminal ;;
  2. print_string [cyan; on_blue] "Hello\n" ;;

Hello - : unit = ()</lang>

PicoLisp

Translation of: UNIX Shell

<lang PicoLisp>(unless (member (sys "TERM") '("linux" "xterm" "xterm-color" "rxvt")) 

  (quit "This application requires a colour terminal") )
  1. Coloured text

(for X '((1 . "Red") (4 . "Blue") (3 . "Yellow")) 

  (call 'tput "setaf" (car X))
  (prinl (cdr X)) )
  1. Blinking

(out '(tput "-S") 

  (prinl "setab 1^Jsetaf 3^Jblink") )

(prin "Flashing text")

(call 'tput 'sgr0) # reset (prinl)</lang>

PureBasic

<lang purebasic>If OpenConsole() 

 PrintN("Background color#     00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15")
 PrintN("                      -----------------------------------------------")
 Define Foreground, Background
 For Foreground = 0 To 15
   ConsoleColor(7, 0) ;grey foreground, black background
   Print("Foreground color# " + RSet(Str(Foreground), 2, "0") + "  ")
   For Background = 0 To 15
     ConsoleColor(Foreground, Background)
     Print(RSet(Str(Foreground), 2, "0"))
     ConsoleColor(7, 0) ;grey foreground, black background
     Print(" ")
   Next
   PrintN("")
 Next
 
 ConsoleColor(7, 0) ;grey foreground, black background
 Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input()
 CloseConsole()

EndIf</lang>

REXX

PC/REXX or Personnal REXX

This REXX program only works under PC/REXX (also called Personnal REXX).
PC/REXX can execute under MSDOS (or a Windows DOS window), or OS/2.

The prologue code (at the bottom of the program) is a collection of some general-purpose subroutines which determine:

  • which environment (operating system) the REXX interpreter is running under
  • if Windows/NT/XP/Vista/7/8 (the NT family) is running
  • which REXX is being executed
  • what literal to use to obtain the environmental variables (for the value bif)
  • what the fileName, fileType/fileExt, fileMode/path is of the REXX program
  • which command to use to clear the terminal screen
  • invokes $H to show general documentation (1st and only arg = ?)
  • invokes $H to show a flow diagram (1st and only arg = ?FLOW)
  • invokes $H to show sample uses (1st and only arg = ?SAMPLE)
  • invokes $H to show the author & contact info (1st and only arg = ?AUTHOR)

All the prologue was left intact to give a general feel of the scope of the boilerplate code.
The prologue code is in many REXX programs and it's easier to keep them on one line for copying purposes and sorting.

The program displays 16 lines, each of a different color with text stating the color of the text. <lang rexx>/*REXX*/parse arg !;if !all(arg()) then exit

if \!dos & \!os2 then exit /*if this isn't DOS, then exit. */ if \!pcrexx then exit /*if this isn't PC/REXX, exit. */ 

               /* The "real" programs issue all errors through another */
               /* program which has more verbage and explanation, and  */
               /* issues the error text in red  (if color is avaiable).*/

color.0 = 'black' color.1 = 'dark blue' color.2 = 'dark green' color.3 = 'dark cyan/turquois' color.4 = 'dark red' color.5 = 'dark pink/magenta' color.6 = 'dark yellow (orange)' color.7 = 'dark white' color.8 = 'brite black (grey/gray)' color.9 = 'bright blue' color.10 = 'bright green' color.11 = 'bright cyan/turquois' color.12 = 'bright red' color.13 = 'bright pink/magenta' color.14 = 'bright yellow' color.15 = 'bright white' 

        do j=0 to 15                  /*show all sixteen color codes.  */
        call scrwrite ,,'color code=['right(j,2)"]" color.j,,,j;   say
        end                           /*the  "SAY"  forces a  NEWLINE. */

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

/*═════════════════════════════general 1-line subs══════════════════════*/ !all:!!=!;!=space(!);upper !;call !fid;!nt=right(!var('OS'),2)=='NT';!cls=word('CLS VMFCLEAR CLRSCREEN',1+!cms+!tso*2);if arg(1)\==1 then return 0;if wordpos(!,'? ?SAMPLES ?AUTHOR ?FLOW')==0 then return 0;!call=']$H';call '$H' !fn !;!call=;return 1 !cal:if symbol('!CALL')\=="VAR" then !call=;return !call !env:!env='ENVIRONMENT';if !sys=='MSDOS'|!brexx|!r4|!roo then !env='SYSTEM';if !os2 then !env='OS2'!env;!ebcdic=1=='f0'x;return !fid:parse upper source !sys !fun !fid . 1 . . !fn !ft !fm .;call !sys;if !dos then do;_=lastpos('\',!fn);!fm=left(!fn,_);!fn=substr(!fn,_+1);parse var !fn !fn '.' !ft;end;return word(0 !fn !ft !fm,1+('0'arg(1))) !rex:parse upper version !ver !vernum !verdate .;!brexx='BY'==!vernum;!kexx='KEXX'==!ver;!pcrexx='REXX/PERSONAL'==!ver|'REXX/PC'==!ver;!r4='REXX-R4'==!ver;!regina='REXX-REGINA'==left(!ver,11);!roo='REXX-ROO'==!ver;call !env;return !sys:!cms=!sys=='CMS';!os2=!sys=='OS2';!tso=!sys=='TSO'|!sys=='MVS';!vse=!sys=='VSE';!dos=pos('DOS',!sys)\==0|pos('WIN',!sys)\==0|!sys=='CMD';call !rex;return !var:call !fid;if !kexx then return space(dosenv(arg(1)));return space(value(arg(1),,!env)) </lang>

Tcl

This only works on Unix terminals as it delegates to the system tput command. <lang tcl># Utility interfaces to the low-level command proc capability cap {expr {![catch {exec tput -S << $cap}]}} proc colorterm {} {expr {[capability setaf] && [capability setab]}} proc tput args {exec tput -S << $args >/dev/tty} array set color {black 0 red 1 green 2 yellow 3 blue 4 magenta 5 cyan 6 white 7} proc foreground x {exec tput -S << "setaf $::color($x)" > /dev/tty} proc background x {exec tput -S << "setab $::color($x)" > /dev/tty} proc reset {} {exec tput sgr0 > /dev/tty}

  1. Demonstration of use

if {[colorterm]} { 

   foreground blue
   background yellow
   puts "Color output"
   reset

} else { 

   puts "Monochrome only"

}

if {[capability blink]} { 

   tput blink
   puts "Blinking output"
   reset

} else { 

   puts "Steady only"

}</lang>

UNIX Shell

<lang sh>#!/bin/sh

  1. Check if the terminal supports colour

case $TERM in 

 linux)
   ;;
 rxvt)
   ;;
 *)
   echo "HW65000 This application requires a colour terminal" >&2
   exit 252    #ERLHW incompatible hardware
   ;;

esac

  1. Coloured text

tput setaf 1 #red echo "Red" tput setaf 4 #blue echo "Blue" tput setaf 3 # yellow echo "Yellow"

  1. Blinking

tput setab 1 # red background tput setaf 3 # yellow foreground

  1. tput blink # enable blinking (but does not work on some terminals)

echo "Flashing text"

tput sgr0 # reset everything before exiting</lang>

ZX Spectrum Basic

The ZX Spectrum will always output colour. However if the television is black and white, these will show as various levels of luminence corresponding to the numerical colour value. <lang zxbasic>10 FOR l=0 TO 7 20 READ c$: REM get our text for display 30 INK l: REM set the text colour 40 PRINT c$ 50 NEXT l 60 PAPER 2: REM red background 70 INK 6: REM yellow forground 80 FLASH 1: REM activate flashing 90 PRINT "Flashing!": REM this will flash red and yellow (alternating inverse) 100 PAPER 7: INK 0: FLASH 0: REM normalize colours before exit 110 STOP

900 DATA "Black","Blue","Red","Magenta","Green","Cyan","Yellow","White"</lang>

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