Go program to test ANSI terminal color capability.

atctest.go

// ANSI terminal color test.
// Just run it on your terminal to see the available colors.
// CITATION: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
//
// $ go build atctest.go
// $ ./atctest
//
// Copyright (c) 2017 Joe Linoff
// License: MIT Open Source
package main

import (
	"fmt"
)

func main() {
	// Map when to use reverse video.
	m := map[int]bool{
		0:true, 1:true, 2:true, 3:true, 4:true, 5:true, 6:true,
		8:true, 12:true,
		16:true, 17:true, 18:true, 19:true, 20:true, 21:true,
		52:true, 53:true, 54:true, 55:true, 56:true, 57:true,
		232:true, 233:true, 234:true, 235:true,
		236:true, 237:true, 238:true, 239:true,
		240:true, 241:true, 242:true, 243:true }

	// ================================================================
	// 8 color mode - background
	// ================================================================
	fmt.Print("\n")
	fmt.Println("8 Color Mode - Background (ESC[40m .. ESC[47m)")
	fmt.Print("   ")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 40, "Black")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 41, "Red")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 42, "Green")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 43, "Yellow")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 44, "Blue")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 45, "Magenta")
	fmt.Printf("\x1b[%d;37;1m %-7s \x1b[0m", 46, "Cyan")
	fmt.Printf("\x1b[%d;30;1m %-7s \x1b[0m", 47, "White")
	fmt.Print("\n")
	
	// ================================================================
	// 8 color mode - foreground
	// ================================================================
	fmt.Print("\n")
	fmt.Println("8 Color Mode - Foreground (ESC[30m .. ESC[37m)")
	fmt.Print("   ")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 30, "Black")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 31, "Red")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 32, "Green")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 33, "Yellow")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 34, "Blue")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 35, "Magenta")
	fmt.Printf("\x1b[%d;47;1m %-7s \x1b[0m", 36, "Cyan")
	fmt.Printf("\x1b[%d;40;1m %-7s \x1b[0m", 37, "White")
	fmt.Print("\n")
	
	// ================================================================
	// 256 color mode - background
	// ================================================================
	fmt.Print("\n")
	fmt.Print("256 Color Mode - Background (ESC[48;5;Nm)")
	for i := 0 ; i < 256; i++ {
		if (i % 16) == 0 {
			fmt.Printf("\n   ")
		}
		v, ok := m[i]
		if ok && v {
			fmt.Print("\x1b[37m")
		} else {
			fmt.Print("\x1b[30m")
		}
		fmt.Printf("\x1b[48;5;%dm %3d \x1b[0m", i, i)
	}
	fmt.Print("\n")
	
	// ================================================================
	// 256 color mode - foreground
	// ================================================================
	fmt.Print("\n")
	fmt.Print("256 Color Mode - Foreground (ESC[38;5;Nm)")
	for i := 0 ; i < 256; i++ {
		if (i % 16) == 0 {
			fmt.Printf("\n   ")
		}
		v, ok := m[i]
		if ok && v {
			fmt.Print("\x1b[47;1m")
		} else {
			fmt.Print("\x1b[40;1m")
		}
		fmt.Printf("\x1b[38;5;%dm %3d \x1b[0m", i, i)
	}
	fmt.Print("\n")
	fmt.Print("\n")
}