mirror of
https://github.com/charmbracelet/lipgloss.git
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140 lines
3.6 KiB
Go
140 lines
3.6 KiB
Go
package lipgloss
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import (
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"sync"
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"github.com/lucasb-eyer/go-colorful"
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"github.com/muesli/termenv"
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)
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var (
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colorProfile termenv.Profile
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getColorProfile sync.Once
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// Because it's a potentially long operation (relatively speaking), we
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// check the background color on initialization rather than at the last
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// possible second.
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hasDarkBackground = termenv.HasDarkBackground()
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)
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// ColorProfile returns the detected termenv color profile. It will perform the
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// actual check only once.
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func ColorProfile() termenv.Profile {
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getColorProfile.Do(func() {
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colorProfile = termenv.ColorProfile()
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})
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return colorProfile
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}
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// HadDarkBackground returns whether or not the terminal has a dark background.
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func HasDarkBackground() bool {
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return hasDarkBackground
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}
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// TerminalColor is a color intended to be rendered in the terminal. It
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// satisfies the Go color.Color interface.
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type TerminalColor interface {
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value() string
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color() termenv.Color
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RGBA() (r, g, b, a uint32)
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}
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// NoColor is used to specify the absence of color styling. When this is active
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// foreground colors will be rendered with the terminal's default text color,
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// and background colors will not be drawn at all.
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//
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// Example usage:
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//
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// var style = someStyle.Copy().Background(lipgloss.NoColor{})
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//
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type NoColor struct{}
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func (n NoColor) value() string {
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return ""
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}
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func (n NoColor) color() termenv.Color {
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return ColorProfile().Color("")
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}
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// RGBA returns the RGBA value of this color. Because we have to return
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// something, despite this color being the absence of color, we're returning
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// the same value that go-colorful returns on error:
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//
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// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF.
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func (n NoColor) RGBA() (r, g, b, a uint32) {
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return 0x0, 0x0, 0x0, 0xFFFF
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}
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var noColor = NoColor{}
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// Color specifies a color by hex or ANSI value. For example:
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//
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// ansiColor := lipgloss.Color("21")
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// hexColor := lipgloss.Color("#0000ff")
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//
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type Color string
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func (c Color) value() string {
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return string(c)
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}
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func (c Color) color() termenv.Color {
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return ColorProfile().Color(string(c))
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}
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// RGBA returns the RGBA value of this color. This satisfies the Go Color
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// interface. Note that on error we return black with 100% opacity, or:
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//
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// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF
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//
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// This is inline with go-colorful's default behavior.
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func (c Color) RGBA() (r, g, b, a uint32) {
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cf, err := colorful.Hex(c.value())
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if err != nil {
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// If we ignore the return behavior and simply return what go-colorful
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// give us for the color value we'd be returning exactly this, however
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// we're being explicit here for the sake of clarity.
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return colorful.Color{}.RGBA()
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}
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return cf.RGBA()
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}
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// AdaptiveColor provides color options for light and dark backgrounds. The
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// appropriate color with be returned at runtime based on the darkness of the
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// terminal background color.
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//
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// Example usage:
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//
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// color := lipgloss.AdaptiveColor{Light: "#0000ff", Dark: "#000099"}
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//
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type AdaptiveColor struct {
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Light string
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Dark string
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}
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func (ac AdaptiveColor) value() string {
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if HasDarkBackground() {
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return ac.Dark
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}
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return ac.Light
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}
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func (ac AdaptiveColor) color() termenv.Color {
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return ColorProfile().Color(ac.value())
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}
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// RGBA returns the RGBA value of this color. This satisfies the Go Color
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// interface. Note that on error we return black with 100% opacity, or:
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//
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// Red: 0x0, Green: 0x0, Blue: 0x0, Alpha: 0xFFFF
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//
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// This is inline with go-colorful's default behavior.
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func (ac AdaptiveColor) RGBA() (r, g, b, a uint32) {
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cf, err := colorful.Hex(ac.value())
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if err != nil {
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return colorful.Color{}.RGBA()
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}
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return cf.RGBA()
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}
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