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color.go
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color.go
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package iostreams
import (
"fmt"
"os"
"strings"
"github.com/mgutz/ansi"
)
var (
magenta = ansi.ColorFunc("magenta")
cyan = ansi.ColorFunc("cyan")
red = ansi.ColorFunc("red")
yellow = ansi.ColorFunc("yellow")
blue = ansi.ColorFunc("blue")
green = ansi.ColorFunc("green")
gray = ansi.ColorFunc("black+h")
bold = ansi.ColorFunc("default+b")
cyanBold = ansi.ColorFunc("cyan+b")
gray256 = func(t string) string {
return fmt.Sprintf("\x1b[%d;5;%dm%s\x1b[m", 38, 242, t)
}
)
func EnvColorDisabled() bool {
return os.Getenv("NO_COLOR") != "" || os.Getenv("CLICOLOR") == "0"
}
func EnvColorForced() bool {
return os.Getenv("CLICOLOR_FORCE") != "" && os.Getenv("CLICOLOR_FORCE") != "0"
}
func Is256ColorSupported() bool {
term := os.Getenv("TERM")
colorterm := os.Getenv("COLORTERM")
return strings.Contains(term, "256") ||
strings.Contains(term, "24bit") ||
strings.Contains(term, "truecolor") ||
strings.Contains(colorterm, "256") ||
strings.Contains(colorterm, "24bit") ||
strings.Contains(colorterm, "truecolor")
}
func NewColorScheme(enabled, is256enabled bool) *ColorScheme {
return &ColorScheme{
enabled: enabled,
is256enabled: is256enabled,
}
}
type ColorScheme struct {
enabled bool
is256enabled bool
}
func (c *ColorScheme) Bold(t string) string {
if !c.enabled {
return t
}
return bold(t)
}
func (c *ColorScheme) Red(t string) string {
if !c.enabled {
return t
}
return red(t)
}
func (c *ColorScheme) Yellow(t string) string {
if !c.enabled {
return t
}
return yellow(t)
}
func (c *ColorScheme) Green(t string) string {
if !c.enabled {
return t
}
return green(t)
}
func (c *ColorScheme) Gray(t string) string {
if !c.enabled {
return t
}
if c.is256enabled {
return gray256(t)
}
return gray(t)
}
func (c *ColorScheme) Magenta(t string) string {
if !c.enabled {
return t
}
return magenta(t)
}
func (c *ColorScheme) Cyan(t string) string {
if !c.enabled {
return t
}
return cyan(t)
}
func (c *ColorScheme) CyanBold(t string) string {
if !c.enabled {
return t
}
return cyanBold(t)
}
func (c *ColorScheme) Blue(t string) string {
if !c.enabled {
return t
}
return blue(t)
}
func (c *ColorScheme) SuccessIcon() string {
return c.SuccessIconWithColor(c.Green)
}
func (c *ColorScheme) SuccessIconWithColor(colo func(string) string) string {
return colo("✓")
}
func (c *ColorScheme) WarningIcon() string {
return c.Yellow("!")
}
func (c *ColorScheme) FailureIcon() string {
return c.Red("X")
}
func (c *ColorScheme) ColorFromString(s string) func(string) string {
s = strings.ToLower(s)
var fn func(string) string
switch s {
case "bold":
fn = c.Bold
case "red":
fn = c.Red
case "yellow":
fn = c.Yellow
case "green":
fn = c.Green
case "gray":
fn = c.Gray
case "magenta":
fn = c.Magenta
case "cyan":
fn = c.Cyan
case "blue":
fn = c.Blue
default:
fn = func(s string) string {
return s
}
}
return fn
}