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Aurora

go.dev reference Unlicense Build Status Coverage Status GoReportCard

Ultimate ANSI colors for Golang. The package supports Printf/Sprintf etc.

aurora logo

TOC

Installation

Version 1.x

Using gopkg.in.

go get -u gopkg.in/logrusorgru/aurora.v1
Version 2.x
go get -u github.com/logrusorgru/aurora
Go modules support, version v3+

Get

go get -u github.com/logrusorgru/aurora/v3

The v3 was introduced to support go.mod and leave previous import paths as is. Currently, there is no changes between them (excluding the importpath's /v3 tail).

The latest version
go get -u github.com/logrusorgru/aurora/v4

With hyperlinks.

Test

go test -cover -race github.com/logrusorgru/aurora/v4

Replace the import path with your, if it's different.

Usage

Simple

package main

import (
	"fmt"

	"github.com/logrusorgru/aurora/v4"
)

func main() {
	fmt.Println("Hello,", aurora.Magenta("Aurora"))
	fmt.Println(aurora.Bold(aurora.Cyan("Cya!")))
}

simple png

Printf

package main

import (
	"fmt"

	"github.com/logrusorgru/aurora/v4"
)

func main() {
	fmt.Printf("Got it %d times\n", aurora.Green(1240))
	fmt.Printf("PI is %+1.2e\n", aurora.Cyan(3.14))
}

printf png

aurora.Sprintf

package main

import (
	"fmt"

	"github.com/logrusorgru/aurora/v4"
)

func main() {
	fmt.Println(aurora.Sprintf(aurora.Magenta("Got it %d times"), aurora.Green(1240)))
}

sprintf png

Enable/Disable colors

package main

import (
	"fmt"
	"flag"

	"github.com/logrusorgru/aurora/v4"
)

// colorizer
var au *aurora.Aurora

var colors = flag.Bool("colors", false, "enable or disable colors")

func init() {
	flag.Parse()
	au = aurora.New(WithColors(*colors))
}

func main() {
	// use colorizer
	fmt.Println(au.Green("Hello"))
}

Without flags: disable png

With -colors flag: enable png

Hyperlinks, default colorizer, and configurations

Hyperlinks feature description.

Add a red hyperlinks with text "Example" that is referencing to http://example.com.

package main

import (
	"flag"
	"fmt"

	"github.com/logrusorgru/aurora/v4"
)

func main() {
	var conf = aurora.NewConfig()
	conf.AddFlags(flag.CommandLine, "prefix.")
	flag.Parse()

	aurora.DefaultColorizer = aurora.New(conf.Options()...) // set global

	fmt.Println(aurora.Red("Example").Hyperlink("http://example.com/"))
}

Depending flags: depending flags png depending flags gif

Chains

The following samples are equal

x := aurora.BgMagenta(aurora.Bold(aurora.Red("x")))
x := aurora.Red("x").Bold().BgMagenta()

The second is more readable

Colorize

There is Colorize function that allows to choose some colors and format from a side

func getColors() Color {
	// some stuff that returns appropriate colors and format
}

// [...]

func main() {
	fmt.Println(aurora.Colorize("Greeting", getColors()))
}

Less complicated example

x := aurora.Colorize("Greeting", GreenFg|GrayBg|BoldFm)

Unlike other color functions and methods (such as Red/BgBlue etc) a Colorize clears previous colors

x := aurora.Red("x").Colorize(BgGreen) // will be with green background only

Grayscale

fmt.Println("  ",
	aurora.Gray(1-1, " 00-23 ").BgGray(24-1),
	aurora.Gray(4-1, " 03-19 ").BgGray(20-1),
	aurora.Gray(8-1, " 07-15 ").BgGray(16-1),
	aurora.Gray(12-1, " 11-11 ").BgGray(12-1),
	aurora.Gray(16-1, " 15-07 ").BgGray(8-1),
	aurora.Gray(20-1, " 19-03 ").BgGray(4-1),
	aurora.Gray(24-1, " 23-00 ").BgGray(1-1),
)

grayscale png

8-bit colors

Methods Index and BgIndex implements 8-bit colors.

Index/BgIndex Meaning Foreground Background
0- 7 standard colors 30- 37 40- 47
8- 15 bright colors 90- 97 100-107
16-231 216 colors 38;5;n 48;5;n
232-255 24 grayscale 38;5;n 48;5;n

Example

package main

import (
	"fmt"
	"github.com/logrusorgru/aurora"
)

func main() {
	for i := uint8(16); i <= 231; i++ {
		fmt.Println(i, aurora.Index(i, "pew-pew"), aurora.BgIndex(i, "pew-pew"))
	}
}

Supported colors & formats

  • formats
    • bold (1)
    • faint (2)
    • doubly-underline (21)
    • fraktur (20)
    • italic (3)
    • underline (4)
    • slow blink (5)
    • rapid blink (6)
    • reverse video (7)
    • conceal (8)
    • crossed out (9)
    • framed (51)
    • encircled (52)
    • overlined (53)
  • background and foreground colors, including bright
    • black
    • red
    • green
    • yellow (brown)
    • blue
    • magenta
    • cyan
    • white
    • 24 grayscale colors
    • 216 8-bit colors

All colors

linux png
white png

Standard and bright colors

linux black standard png linux white standard png

Formats are likely supported

formats supported gif

Formats are likely unsupported

formats rarely supported png

Limitations

There is no way to represent %T and %p with colors using a standard approach

package main

import (
	"fmt"

	"github.com/logrusorgru/aurora"
)

func main() {
	var (
		r = aurora.Red("red")
		i int
	)
	fmt.Printf("%T %p\n", r, aurora.Green(&i))
}

Output will be without colors

aurora.value %!p(aurora.value={0xc42000a310 768 0})

The obvious workaround is Red(fmt.Sprintf("%T", some))

Windows

The Aurora provides ANSI colors only, so there is no support for Windows. That said, there are workarounds available. Check out these comments to learn more:

TTY

The Aurora has no internal TTY detectors by design. Take a look this comment if you want turn on colors for a terminal only, and turn them off for a file.

Licensing

Copyright © 2016-2022 The Aurora Authors. This work is free. It comes without any warranty, to the extent permitted by applicable law. You can redistribute it and/or modify it under the terms of the the Unlicense. See the LICENSE file for more details.

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Golang ultimate ANSI-colors that supports Printf/Sprintf methods

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