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package ansi
import (
"fmt"
"image/color"
)
// Colorizer is a [color.Color] interface that can be formatted as a string.
type Colorizer interface {
color.Color
fmt.Stringer
}
// HexColorizer is a [color.Color] that can be formatted as a hex string.
type HexColorizer struct{ color.Color }
var _ Colorizer = HexColorizer{}
// String returns the color as a hex string. If the color is nil, an empty
// string is returned.
func (h HexColorizer) String() string {
if h.Color == nil {
return ""
}
r, g, b, _ := h.RGBA()
// Get the lower 8 bits
r &= 0xff
g &= 0xff
b &= 0xff
return fmt.Sprintf("#%02x%02x%02x", uint8(r), uint8(g), uint8(b)) //nolint:gosec
}
// XRGBColorizer is a [color.Color] that can be formatted as an XParseColor
// rgb: string.
//
// See: https://linux.die.net/man/3/xparsecolor
type XRGBColorizer struct{ color.Color }
var _ Colorizer = XRGBColorizer{}
// String returns the color as an XParseColor rgb: string. If the color is nil,
// an empty string is returned.
func (x XRGBColorizer) String() string {
if x.Color == nil {
return ""
}
r, g, b, _ := x.RGBA()
// Get the lower 8 bits
return fmt.Sprintf("rgb:%04x/%04x/%04x", r, g, b)
}
// XRGBAColorizer is a [color.Color] that can be formatted as an XParseColor
// rgba: string.
//
// See: https://linux.die.net/man/3/xparsecolor
type XRGBAColorizer struct{ color.Color }
var _ Colorizer = XRGBAColorizer{}
// String returns the color as an XParseColor rgba: string. If the color is nil,
// an empty string is returned.
func (x XRGBAColorizer) String() string {
if x.Color == nil {
return ""
}
r, g, b, a := x.RGBA()
// Get the lower 8 bits
return fmt.Sprintf("rgba:%04x/%04x/%04x/%04x", r, g, b, a)
}
// SetForegroundColor returns a sequence that sets the default terminal
// foreground color.
//
// OSC 10 ; color ST
// OSC 10 ; color BEL
//
// Where color is the encoded color number.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
func SetForegroundColor(c color.Color) string {
var s string
switch c := c.(type) {
case Colorizer:
s = c.String()
case fmt.Stringer:
s = c.String()
default:
s = HexColorizer{c}.String()
}
return "\x1b]10;" + s + "\x07"
}
// RequestForegroundColor is a sequence that requests the current default
// terminal foreground color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const RequestForegroundColor = "\x1b]10;?\x07"
// ResetForegroundColor is a sequence that resets the default terminal
// foreground color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const ResetForegroundColor = "\x1b]110\x07"
// SetBackgroundColor returns a sequence that sets the default terminal
// background color.
//
// OSC 11 ; color ST
// OSC 11 ; color BEL
//
// Where color is the encoded color number.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
func SetBackgroundColor(c color.Color) string {
var s string
switch c := c.(type) {
case Colorizer:
s = c.String()
case fmt.Stringer:
s = c.String()
default:
s = HexColorizer{c}.String()
}
return "\x1b]11;" + s + "\x07"
}
// RequestBackgroundColor is a sequence that requests the current default
// terminal background color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const RequestBackgroundColor = "\x1b]11;?\x07"
// ResetBackgroundColor is a sequence that resets the default terminal
// background color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const ResetBackgroundColor = "\x1b]111\x07"
// SetCursorColor returns a sequence that sets the terminal cursor color.
//
// OSC 12 ; color ST
// OSC 12 ; color BEL
//
// Where color is the encoded color number.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
func SetCursorColor(c color.Color) string {
var s string
switch c := c.(type) {
case Colorizer:
s = c.String()
case fmt.Stringer:
s = c.String()
default:
s = HexColorizer{c}.String()
}
return "\x1b]12;" + s + "\x07"
}
// RequestCursorColor is a sequence that requests the current terminal cursor
// color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const RequestCursorColor = "\x1b]12;?\x07"
// ResetCursorColor is a sequence that resets the terminal cursor color.
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
const ResetCursorColor = "\x1b]112\x07"
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