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package ansi
import (
"fmt"
"image/color"
"strconv"
"strings"
"github.com/lucasb-eyer/go-colorful"
)
// colorToHexString returns a hex string representation of a color.
func colorToHexString(c color.Color) string { //nolint:unused
if c == nil {
return ""
}
shift := func(v uint32) uint32 {
if v > 0xff {
return v >> 8
}
return v
}
r, g, b, _ := c.RGBA()
r, g, b = shift(r), shift(g), shift(b)
return fmt.Sprintf("#%02x%02x%02x", r, g, b)
}
// rgbToHex converts red, green, and blue values to a hexadecimal value.
//
// hex := rgbToHex(0, 0, 255) // 0x0000FF
func rgbToHex(r, g, b uint32) uint32 { //nolint:unused
return r<<16 + g<<8 + b
}
type shiftable interface {
~uint | ~uint16 | ~uint32 | ~uint64
}
func shift[T shiftable](x T) T {
if x > 0xff {
x >>= 8
}
return x
}
// XParseColor is a helper function that parses a string into a color.Color. It
// provides a similar interface to the XParseColor function in Xlib. It
// supports the following formats:
//
// - #RGB
// - #RRGGBB
// - rgb:RRRR/GGGG/BBBB
// - rgba:RRRR/GGGG/BBBB/AAAA
//
// If the string is not a valid color, nil is returned.
//
// See: https://linux.die.net/man/3/xparsecolor
func XParseColor(s string) color.Color {
switch {
case strings.HasPrefix(s, "#"):
c, err := colorful.Hex(s)
if err != nil {
return nil
}
return c
case strings.HasPrefix(s, "rgb:"):
parts := strings.Split(s[4:], "/")
if len(parts) != 3 {
return nil
}
r, _ := strconv.ParseUint(parts[0], 16, 32)
g, _ := strconv.ParseUint(parts[1], 16, 32)
b, _ := strconv.ParseUint(parts[2], 16, 32)
return color.RGBA{uint8(shift(r)), uint8(shift(g)), uint8(shift(b)), 255} //nolint:gosec
case strings.HasPrefix(s, "rgba:"):
parts := strings.Split(s[5:], "/")
if len(parts) != 4 {
return nil
}
r, _ := strconv.ParseUint(parts[0], 16, 32)
g, _ := strconv.ParseUint(parts[1], 16, 32)
b, _ := strconv.ParseUint(parts[2], 16, 32)
a, _ := strconv.ParseUint(parts[3], 16, 32)
return color.RGBA{uint8(shift(r)), uint8(shift(g)), uint8(shift(b)), uint8(shift(a))} //nolint:gosec
}
return nil
}
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