go: GChalk

https://github.com/jwalton/gchalk is a library heavily inspired by chalk, the popular Node.js terminal color library, and using go ports of supports-color and ansi-styles.

Features

• Expressive API
• Highly performant
• Ability to nest styles
• 256/Truecolor color support with automatic conversion if not supported
• Auto-detects color support
• Painless Windows 10 support

Feature Comparison

Feature	gchalk	aurora	fatih/color	mgutz/ansi
TTY Detection	✅	❌	✅ (1)	❌
Color Detection	✅	❌	❌	❌
Windows 10	✅	❌	✅ (2)	❌
Nested Styles	✅	✅ (3)	❌	❌
256 Color Support	✅	✅ (4)	❌	✅ (4)
16.7m Color Support	✅	❌	❌	❌
Speed	70ns	196ns	420ns	40ns

1. fatih/color supports automatic TTY detection, but assumes that if stdout is not a TTY, then stderr is also not a TTY, which may not be true.
2. fatih/color supports Windows 10, but you need to write to a special stream.
3. aurora supports nested styles via its custom Sprintf(), but you can’t convert things to a string first – need to keep everything as aurora Values.
4. aurora and mgutz/ansi both support 256 color output, but they don’t detect whether the terminal supports it or not, and won’t automatically convert 256 color output to 16 color output if it doesn’t.

Ussage

package main

import (
    "fmt"
    "github.com/jwalton/gchalk"
)

func main() {
    fmt.Println(gchalk.Blue("This line is blue"))
    fmt.Println(gchalk.Blue("Hello") + " World" + gchalk.Red("!"))
    fmt.Println(gchalk.WithBlue().WithBgRed().Bold("Hello world!"))
    fmt.Println(gchalk.WithRGB(123, 45, 67).Underline("Underlined reddish color"))
    fmt.Println(gchalk.WihHex("#DEADED").Bold("Bold gray!"))
    fmt.Println(gchalk.StyleMust("blue")("Hello World!"))

    os.Stderr.WriteString(gchalk.Stderr.Red("Ohs noes!\n"))

    var error = gchalk.WithBold().Red
    var warning = gchalk.Yellow
    fmt.Println(error("Error!"))
    fmt.Println(warning("Warning!"))
}