feat: introduce theme management and performance improvements (#7)

internal/theme/gruvbox.go

@@ -0,0 +1,45 @@
+package theme
+
+// gruvbox dark
+// https://github.com/morhetz/gruvbox
+var paletteGruvboxDark = Palette{
+	Name: "gruvbox-dark",
+
+	Fg:       "#ebdbb2", // fg
+	FgMuted:  "#d5c4a1", // fg2
+	FgSubtle: "#a89984", // fg4
+	Bg:       "#282828", // bg
+	BgMuted:  "#3c3836", // bg1
+	Border:   "#504945", // bg2
+
+	Red:     "#fb4934",
+	Green:   "#b8bb26",
+	Yellow:  "#fabd2f",
+	Blue:    "#83a598",
+	Magenta: "#d3869b", // purple
+	Cyan:    "#8ec07c", // aqua
+	Orange:  "#fe8019",
+	Gray:    "#928374",
+}
+
+// gruvbox light
+var paletteGruvboxLight = Palette{
+	Name: "gruvbox-light",
+
+	Fg:       "#3c3836", // fg
+	FgMuted:  "#504945", // fg2
+	FgSubtle: "#7c6f64", // fg4
+	Bg:       "#fbf1c7", // bg
+	BgMuted:  "#ebdbb2", // bg1
+	Border:   "#d5c4a1", // bg2
+
+	Red:     "#cc241d",
+	Green:   "#98971a",
+	Yellow:  "#d79921",
+	Blue:    "#458588",
+	Magenta: "#b16286", // purple
+	Cyan:    "#689d6a", // aqua
+	Orange:  "#d65d0e",
+	Gray:    "#928374",
+}
+