stepping towards api solidification

simplecolor/simplecolors.go

@@ -0,0 +1,77 @@
+package simplecolor
+
+import (
+	"image/color"
+	"sort"
+)
+
+type SimpleColor int
+type NamedPalette map[string]SimpleColor
+type SimplePalette []SimpleColor
+type conversionPalette []color.Color
+
+func (s SimplePalette) ToPalette() color.Palette {
+	var x color.Palette
+	for _, c := range s {
+		x = append(x, SimpleColor(c))
+	}
+	return color.Palette(x)
+}
+
+func (s SimpleColor) RGBA() (r, g, b, a uint32) {
+	return uint32(s) >> 16 & 0xFF, uint32(s) >> 8 & 0xFF, uint32(s) & 0xFF, 0xFF
+}
+
+func (input SimpleColor) ToAnsi16() SimpleColor {
+	color := ansi[0:16].ToPalette().Convert(input)
+	r, g, b, _ := color.RGBA()
+	return SimpleColor(uint32(r)<<16 + uint32(g)<<8 + b)
+
+}
+func (input SimpleColor) ToExtendedAnsi() SimpleColor {
+	color := ansi.ToPalette().Convert(input)
+	r, g, b, _ := color.RGBA()
+	return SimpleColor(uint32(r)<<16 + uint32(g)<<8 + b)
+}
+
+func (p SimplePalette) ToExtendedAnsi() (sp SimplePalette) {
+	used := make(map[SimpleColor]bool)
+	for _, x := range p {
+		clampedColor := x.ToExtendedAnsi()
+		if _, found := used[clampedColor]; found {
+			continue
+		}
+		used[clampedColor] = true
+		sp = append(sp, x.ToExtendedAnsi())
+	}
+	sort.Sort(sp)
+
+	return
+}
+
+func (e SimplePalette) Len() int {
+	return len(e)
+}
+
+func (e SimplePalette) Less(i, j int) bool {
+	return int(e[i]) < int(e[j])
+}
+
+func (e SimplePalette) Swap(i, j int) {
+	e[i], e[j] = e[j], e[i]
+}
+
+func (p SimplePalette) ToAnsi16() (sp SimplePalette) {
+	used := make(map[SimpleColor]bool)
+	for _, x := range p {
+		clampedColor := x.ToAnsi16()
+		if _, found := used[clampedColor]; found {
+			continue
+		}
+		used[clampedColor] = true
+		sp = append(sp, x.ToExtendedAnsi())
+	}
+	sort.Sort(sp)
+
+	return
+}