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|
package color
import (
"fmt"
"strings"
)
const Reset = "\033[0m"
var ansiFg = map[string]int{
"black": 30,
"red": 31,
"green": 32,
"yellow": 33,
"blue": 34,
"magenta": 35,
"cyan": 36,
"white": 37,
}
var ansiBg = map[string]int{
"black": 40,
"red": 41,
"green": 42,
"yellow": 43,
"blue": 44,
"magenta": 45,
"cyan": 46,
"white": 47,
}
var ansiBrightFg = map[string]int{
"bright_black": 90,
"bright_red": 91,
"bright_green": 92,
"bright_yellow": 93,
"bright_blue": 94,
"bright_magenta": 95,
"bright_cyan": 96,
"bright_white": 97,
}
var ansiBrightBg = map[string]int{
"bright_black": 100,
"bright_red": 101,
"bright_green": 102,
"bright_yellow": 103,
"bright_blue": 104,
"bright_magenta": 105,
"bright_cyan": 106,
"bright_white": 107,
}
var xtermFg = map[string]int{
"black": 0,
"red": 1,
"green": 2,
"yellow": 3,
"blue": 4,
"magenta": 5,
"cyan": 6,
"white": 7,
"bright_black": 8,
"bright_red": 9,
"bright_green": 10,
"bright_yellow": 11,
"bright_blue": 12,
"bright_magenta": 13,
"bright_cyan": 14,
"bright_white": 15,
}
var ansiStyles = map[string]string{
"bold": "\033[1m",
"dim": "\033[2m",
"italic": "\033[3m",
"underline": "\033[4m",
}
func Fg(mode, name string) string {
if mode == "none" || mode == "" {
return ""
}
if mode == "xterm256" {
if c, ok := xtermFg[name]; ok {
return fmt.Sprintf("\033[38;5;%dm", c)
}
return ""
}
if c, ok := ansiFg[name]; ok {
return fmt.Sprintf("\033[%dm", c)
}
if c, ok := ansiBrightFg[name]; ok {
return fmt.Sprintf("\033[%dm", c)
}
return ""
}
func Bg(mode, name string) string {
if mode == "none" || mode == "" {
return ""
}
if mode == "xterm256" {
if c, ok := xtermFg[name]; ok {
return fmt.Sprintf("\033[48;5;%dm", c)
}
return ""
}
if c, ok := ansiBg[name]; ok {
return fmt.Sprintf("\033[%dm", c)
}
if c, ok := ansiBrightBg[name]; ok {
return fmt.Sprintf("\033[%dm", c)
}
return ""
}
func Style(name string) string {
if s, ok := ansiStyles[name]; ok {
return s
}
return ""
}
type ColorSpec struct {
Fg string
Bg string
Bold bool
Dim bool
Italic bool
Underline bool
}
func Parse(input string) ColorSpec {
var spec ColorSpec
for _, token := range strings.Fields(input) {
switch {
case token == "bold":
spec.Bold = true
case token == "dim":
spec.Dim = true
case token == "italic":
spec.Italic = true
case token == "underline":
spec.Underline = true
case strings.HasPrefix(token, "fg="):
spec.Fg = strings.TrimPrefix(token, "fg=")
case strings.HasPrefix(token, "bg="):
spec.Bg = strings.TrimPrefix(token, "bg=")
}
}
return spec
}
func (s ColorSpec) Empty() bool {
return s.Fg == "" && s.Bg == "" && !s.Bold && !s.Dim && !s.Italic && !s.Underline
}
func Render(mode string, spec ColorSpec, text string) string {
if mode == "none" || mode == "" || spec.Empty() {
return text
}
var codes []string
if spec.Bold {
codes = append(codes, Style("bold"))
}
if spec.Dim {
codes = append(codes, Style("dim"))
}
if spec.Italic {
codes = append(codes, Style("italic"))
}
if spec.Underline {
codes = append(codes, Style("underline"))
}
if spec.Fg != "" {
codes = append(codes, Fg(mode, spec.Fg))
}
if spec.Bg != "" {
codes = append(codes, Bg(mode, spec.Bg))
}
if len(codes) == 0 {
return text
}
return strings.Join(codes, "") + text + Reset
}
|
