mqtt/vendor/github.com/logrusorgru/aurora

Aurora

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

TOC

• Installation
• Usage
  • Simple
  • Printf
  • aurora.Sprintf
  • Enable/Disable colors
• Chains
• Colorize
• Grayscale
• 8-bit colors
• Supported Colors & Formats
  • All colors
  • Standard and bright colors
  • Formats are likely supported
  • Formats are likely unsupported
• Limitations
  • Windows
  • TTY
• Licensing

Installation

Get

go get -u github.com/logrusorgru/aurora

Test

go test -cover github.com/logrusorgru/aurora

Usage

Simple

package main

import (
	"fmt"

	. "github.com/logrusorgru/aurora"
)

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

Printf

package main

import (
	"fmt"

	. "github.com/logrusorgru/aurora"
)

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

aurora.Sprintf

package main

import (
	"fmt"

	. "github.com/logrusorgru/aurora"
)

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

Enable/Disable colors

package main

import (
	"fmt"
	"flag"

	"github.com/logrusorgru/aurora"
)

// colorizer
var au aurora.Aurora

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

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

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

Without flags:

With -colors flag:

Chains

The following samples are equal

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

x := 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(Colorize("Greeting", getColors()))
}

Less complicated example

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

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

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

Grayscale

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

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

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

Standard and bright colors

Formats are likely supported

Formats are likely unsupported

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() {
	r := Red("red")
	var i int
	fmt.Printf("%T %p\n", r, 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:

• Using go-colorable.
• Using registry for Windows 10.

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 © 2016-2020 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.