rename luna, refactor material

vim/luna/luna.go

@@ -0,0 +1,32 @@
+package luna
+
+import (
+	"sort"
+	"sync"
+
+	"github.com/taigrr/go-colorpalettes/simplecolor"
+)
+
+var once sync.Once
+var colors = simplecolor.SimplePalette{0x002b2b,
+	0x003f3f,
+	0x005e5e,
+	0x2aa198,
+	0x2e8b57,
+	0x4e4e4e,
+	0x450000,
+	0x789f00,
+	0x780000,
+	0x973d45,
+	0xe20000,
+	0xff8036,
+	0xffff9a,
+	0xffffff,
+}
+
+func GetPalette() (sp simplecolor.SimplePalette) {
+	once.Do(func() {
+		sort.Sort(colors)
+	})
+	return colors
+}