Go TermColors

The package was designed around pulling in the ANSI codes the being able to colorize the terminal with minimal effort. The package tests that it runs in both interactive and non interactive environments.

ANSI Codes:

Black = "\033[30m"
Red = "\033[31m"
Green = "\033[32m"
Yellow = "\033[33m"
Blue = "\033[34m"
Magenta = "\033[35m"
Cyan = "\033[36m"
White = "\033[37m"
Reset = "\033[0m"
Clear = "\033[H\033[2J"
CurOn = "\033[?25h"
CurOff = "\033[?25l"

termcolor.go:

package termcolors

import (
	"fmt"
	"math/rand"
	"os"

	"golang.org/x/term"
)

var (
	forcedColorOn = false
	Black         = ""
	K             = ""
	Red           = ""
	R             = ""
	Green         = ""
	G             = ""
	Yellow        = ""
	Y             = ""
	Blue          = ""
	B             = ""
	Magenta       = ""
	M             = ""
	Cyan          = ""
	C             = ""
	White         = ""
	W             = ""
	Reset         = ""
	X             = ""
	Clear         = ""
	CurOn         = ""
	CurOff        = ""
)

func init() {
	checkingInteractive(SetColor)
}

// Sets the terminal color variables if the stdout is missing. Telling us that
// the terminal is likely non-interactive.
func SetColor() {
	Black = "\033[30m"
	K = Black
	Red = "\033[31m"
	R = Red
	Green = "\033[32m"
	G = Green
	Yellow = "\033[33m"
	Y = Yellow
	Blue = "\033[34m"
	B = Blue
	Magenta = "\033[35m"
	M = Magenta
	Cyan = "\033[36m"
	C = Cyan
	White = "\033[37m"
	W = White
	Reset = "\033[0m"
	X = Reset
	Clear = "\033[H\033[2J"
	CurOn = "\033[?25h"
	CurOff = "\033[?25l"
}

// Checking if interactive terminal and running the function taken in from
// input if the terminal is interactive
func checkingInteractive(fn func()) {
	if term.IsTerminal(int(os.Stdout.Fd())) && term.IsTerminal(int(os.Stdin.Fd())) {
		forcedColorOn = true
		fn()
	}
}

// Rand returns a random color ANSI escape between Black (30) and White (37)
func RandomColor(forceColorOns ...bool) string {
	if len(forceColorOns) > 0 {
		forcedColorOn = forceColorOns[0]
	}

	if forcedColorOn {
		var b [1]byte
		rand.Read(b[:])
		colorCode := int(b[0]) % 8
		color := fmt.Sprintf("\033[3%dm", colorCode)
		return color
	}
	return ""
}

If you would like to see examples you can checkout and run the tests.

One thing I want to mention. If you turn the color on. You also have to clear the color afterwards. Or the terminal will maintain the color.