True colour testing for terminal and tmux

bin/testing/color-24bit.sh

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+#!/bin/bash
+# This file was originally taken from iterm2 https://github.com/gnachman/iTerm2/blob/master/tests/24-bit-color.sh
+#
+#   This file echoes a bunch of 24-bit color codes
+#   to the terminal to demonstrate its functionality.
+#   The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
+#   The background escape sequence is ^[48;2;<r>;<g>;<b>m
+#   <r> <g> <b> range from 0 to 255 inclusive.
+#   The escape sequence ^[0m returns output to default
+
+setBackgroundColor()
+{
+    #printf '\x1bPtmux;\x1b\x1b[48;2;%s;%s;%sm' $1 $2 $3
+    printf '\x1b[48;2;%s;%s;%sm' $1 $2 $3
+}
+
+resetOutput()
+{
+    echo -en "\x1b[0m\n"
+}
+
+# Gives a color $1/255 % along HSV
+# Who knows what happens when $1 is outside 0-255
+# Echoes "$red $green $blue" where
+# $red $green and $blue are integers
+# ranging between 0 and 255 inclusive
+rainbowColor()
+{ 
+    let h=$1/43
+    let f=$1-43*$h
+    let t=$f*255/43
+    let q=255-t
+
+    if [ $h -eq 0 ]
+    then
+        echo "255 $t 0"
+    elif [ $h -eq 1 ]
+    then
+        echo "$q 255 0"
+    elif [ $h -eq 2 ]
+    then
+        echo "0 255 $t"
+    elif [ $h -eq 3 ]
+    then
+        echo "0 $q 255"
+    elif [ $h -eq 4 ]
+    then
+        echo "$t 0 255"
+    elif [ $h -eq 5 ]
+    then
+        echo "255 0 $q"
+    else
+        # execution should never reach here
+        echo "0 0 0"
+    fi
+}
+
+for i in `seq 0 127`; do
+    setBackgroundColor $i 0 0
+    echo -en " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor $i 0 0
+    echo -en " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor 0 $i 0
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor 0 $i 0
+    echo -n " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor 0 0 $i
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor 0 0 $i
+    echo -n " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor `rainbowColor $i`
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor `rainbowColor $i`
+    echo -n " "
+done
+resetOutput

bin/testing/color-spaces.pl

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+#!/usr/bin/perl
+# Author: Todd Larason <jtl@molehill.org>
+# $XFree86: xc/programs/xterm/vttests/256colors2.pl,v 1.1 1999/07/11 08:49:54 dawes Exp $
+
+print "256 color mode\n\n";
+
+# display back ground colors
+
+for ($fgbg = 38; $fgbg <= 48; $fgbg +=10) {
+
+# first the system ones:
+print "System colors:\n";
+for ($color = 0; $color < 8; $color++) {
+    print "\x1b[${fgbg};5;${color}m::";
+}
+print "\x1b[0m\n";
+for ($color = 8; $color < 16; $color++) {
+    print "\x1b[${fgbg};5;${color}m::";
+}
+print "\x1b[0m\n\n";
+
+# now the color cube
+print "Color cube, 6x6x6:\n";
+for ($green = 0; $green < 6; $green++) {
+    for ($red = 0; $red < 6; $red++) {
+	for ($blue = 0; $blue < 6; $blue++) {
+	    $color = 16 + ($red * 36) + ($green * 6) + $blue;
+	    print "\x1b[${fgbg};5;${color}m::";
+	}
+	print "\x1b[0m ";
+    }
+    print "\n";
+}
+
+# now the grayscale ramp
+print "Grayscale ramp:\n";
+for ($color = 232; $color < 256; $color++) {
+    print "\x1b[${fgbg};5;${color}m::";
+}
+print "\x1b[0m\n\n";
+
+}
+
+print "Examples for the 3-byte color mode\n\n";
+
+for ($fgbg = 38; $fgbg <= 48; $fgbg +=10) {
+
+# now the color cube
+print "Color cube\n";
+for ($green = 0; $green < 256; $green+=51) {
+    for ($red = 0; $red < 256; $red+=51) {
+	for ($blue = 0; $blue < 256; $blue+=51) {
+            print "\x1b[${fgbg};2;${red};${green};${blue}m::";
+	}
+	print "\x1b[0m ";
+    }
+    print "\n";
+}
+
+# now the grayscale ramp
+print "Grayscale ramp:\n";
+for ($gray = 8; $gray < 256; $gray+=10) {
+    print "\x1b[${fgbg};2;${gray};${gray};${gray}m::";
+}
+print "\x1b[0m\n\n";
+
+}

bin/testing/color-zigzag.sh

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+#!/bin/bash
+awk 'BEGIN{
+    s="/\\/\\/\\/\\/\\"; s=s s s s s s s s s s s s s s s s s s s s s s s;
+    for (colnum = 0; colnum<256; colnum++) {
+        r = 255-(colnum*255/255);
+        g = (colnum*510/255);
+        b = (colnum*255/255);
+        if (g>255) g = 510-g;
+        printf "\033[48;2;%d;%d;%dm", r,g,b;
+        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
+        printf "%s\033[0m", substr(s,colnum+1,1);
+    }
+    printf "\n";
+}'