blob: 68b3cfc192736d974d1d92c50c7d0e5900e44f7a [file] [log] [blame]
package ansi
import (
"bytes"
"fmt"
"strconv"
"strings"
)
const (
black = iota
red
green
yellow
blue
magenta
cyan
white
defaultt = 9
normalIntensityFG = 30
highIntensityFG = 90
normalIntensityBG = 40
highIntensityBG = 100
start = "\033["
normal = "0;"
bold = "1;"
blink = "5;"
underline = "4;"
inverse = "7;"
strikethrough = "9;"
// Reset is the ANSI reset escape sequence
Reset = "\033[0m"
// DefaultBG is the default background
DefaultBG = "\033[49m"
// DefaultFG is the default foreground
DefaultFG = "\033[39m"
)
// Black FG
var Black string
// Red FG
var Red string
// Green FG
var Green string
// Yellow FG
var Yellow string
// Blue FG
var Blue string
// Magenta FG
var Magenta string
// Cyan FG
var Cyan string
// White FG
var White string
// LightBlack FG
var LightBlack string
// LightRed FG
var LightRed string
// LightGreen FG
var LightGreen string
// LightYellow FG
var LightYellow string
// LightBlue FG
var LightBlue string
// LightMagenta FG
var LightMagenta string
// LightCyan FG
var LightCyan string
// LightWhite FG
var LightWhite string
var (
plain = false
// Colors maps common color names to their ANSI color code.
Colors = map[string]int{
"black": black,
"red": red,
"green": green,
"yellow": yellow,
"blue": blue,
"magenta": magenta,
"cyan": cyan,
"white": white,
"default": defaultt,
}
)
func init() {
for i := 0; i < 256; i++ {
Colors[strconv.Itoa(i)] = i
}
Black = ColorCode("black")
Red = ColorCode("red")
Green = ColorCode("green")
Yellow = ColorCode("yellow")
Blue = ColorCode("blue")
Magenta = ColorCode("magenta")
Cyan = ColorCode("cyan")
White = ColorCode("white")
LightBlack = ColorCode("black+h")
LightRed = ColorCode("red+h")
LightGreen = ColorCode("green+h")
LightYellow = ColorCode("yellow+h")
LightBlue = ColorCode("blue+h")
LightMagenta = ColorCode("magenta+h")
LightCyan = ColorCode("cyan+h")
LightWhite = ColorCode("white+h")
}
// ColorCode returns the ANSI color color code for style.
func ColorCode(style string) string {
return colorCode(style).String()
}
// Gets the ANSI color code for a style.
func colorCode(style string) *bytes.Buffer {
buf := bytes.NewBufferString("")
if plain || style == "" {
return buf
}
if style == "reset" {
buf.WriteString(Reset)
return buf
} else if style == "off" {
return buf
}
foregroundBackground := strings.Split(style, ":")
foreground := strings.Split(foregroundBackground[0], "+")
fgKey := foreground[0]
fg := Colors[fgKey]
fgStyle := ""
if len(foreground) > 1 {
fgStyle = foreground[1]
}
bg, bgStyle := "", ""
if len(foregroundBackground) > 1 {
background := strings.Split(foregroundBackground[1], "+")
bg = background[0]
if len(background) > 1 {
bgStyle = background[1]
}
}
buf.WriteString(start)
base := normalIntensityFG
buf.WriteString(normal) // reset any previous style
if len(fgStyle) > 0 {
if strings.Contains(fgStyle, "b") {
buf.WriteString(bold)
}
if strings.Contains(fgStyle, "B") {
buf.WriteString(blink)
}
if strings.Contains(fgStyle, "u") {
buf.WriteString(underline)
}
if strings.Contains(fgStyle, "i") {
buf.WriteString(inverse)
}
if strings.Contains(fgStyle, "s") {
buf.WriteString(strikethrough)
}
if strings.Contains(fgStyle, "h") {
base = highIntensityFG
}
}
// if 256-color
n, err := strconv.Atoi(fgKey)
if err == nil {
fmt.Fprintf(buf, "38;5;%d;", n)
} else {
fmt.Fprintf(buf, "%d;", base+fg)
}
base = normalIntensityBG
if len(bg) > 0 {
if strings.Contains(bgStyle, "h") {
base = highIntensityBG
}
// if 256-color
n, err := strconv.Atoi(bg)
if err == nil {
fmt.Fprintf(buf, "48;5;%d;", n)
} else {
fmt.Fprintf(buf, "%d;", base+Colors[bg])
}
}
// remove last ";"
buf.Truncate(buf.Len() - 1)
buf.WriteRune('m')
return buf
}
// Color colors a string based on the ANSI color code for style.
func Color(s, style string) string {
if plain || len(style) < 1 {
return s
}
buf := colorCode(style)
buf.WriteString(s)
buf.WriteString(Reset)
return buf.String()
}
// ColorFunc creates a closure to avoid computation ANSI color code.
func ColorFunc(style string) func(string) string {
if style == "" {
return func(s string) string {
return s
}
}
color := ColorCode(style)
return func(s string) string {
if plain || s == "" {
return s
}
buf := bytes.NewBufferString(color)
buf.WriteString(s)
buf.WriteString(Reset)
result := buf.String()
return result
}
}
// DisableColors disables ANSI color codes. The default is false (colors are on).
func DisableColors(disable bool) {
plain = disable
if plain {
Black = ""
Red = ""
Green = ""
Yellow = ""
Blue = ""
Magenta = ""
Cyan = ""
White = ""
LightBlack = ""
LightRed = ""
LightGreen = ""
LightYellow = ""
LightBlue = ""
LightMagenta = ""
LightCyan = ""
LightWhite = ""
} else {
Black = ColorCode("black")
Red = ColorCode("red")
Green = ColorCode("green")
Yellow = ColorCode("yellow")
Blue = ColorCode("blue")
Magenta = ColorCode("magenta")
Cyan = ColorCode("cyan")
White = ColorCode("white")
LightBlack = ColorCode("black+h")
LightRed = ColorCode("red+h")
LightGreen = ColorCode("green+h")
LightYellow = ColorCode("yellow+h")
LightBlue = ColorCode("blue+h")
LightMagenta = ColorCode("magenta+h")
LightCyan = ColorCode("cyan+h")
LightWhite = ColorCode("white+h")
}
}