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color.go
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package utils
import (
"fmt"
"io"
"os"
"github.com/cli/cli/pkg/iostreams"
"github.com/mattn/go-colorable"
"github.com/mgutz/ansi"
)
var (
// Outputs ANSI color if stdout is a tty
Magenta = makeColorFunc("magenta")
Cyan = makeColorFunc("cyan")
Red = makeColorFunc("red")
Yellow = makeColorFunc("yellow")
Blue = makeColorFunc("blue")
Green = makeColorFunc("green")
Gray = makeColorFunc("black+h")
Bold = makeColorFunc("default+b")
)
// NewColorable returns an output stream that handles ANSI color sequences on Windows
func NewColorable(w io.Writer) io.Writer {
if f, isFile := w.(*os.File); isFile {
return colorable.NewColorable(f)
}
return w
}
func makeColorFunc(color string) func(string) string {
cf := ansi.ColorFunc(color)
return func(arg string) string {
if isColorEnabled() {
if color == "black+h" && iostreams.Is256ColorSupported() {
return fmt.Sprintf("\x1b[%d;5;%dm%s\x1b[m", 38, 242, arg)
}
return cf(arg)
}
return arg
}
}
func isColorEnabled() bool {
if iostreams.EnvColorForced() {
return true
}
if iostreams.EnvColorDisabled() {
return false
}
// TODO ignores cmd.OutOrStdout
return IsTerminal(os.Stdout)
}