feat(theme): add catppuccin themes with transparency and 256-color support

Add a theme package providing all four catppuccin flavors (mocha,
frappe, macchiato, latte) mapped to the xterm-256 palette. Themes are
selected with -theme or the CTOP_THEME environment variable; -i inverts
the flavor. Background slots use the terminal's native color for
transparency (opt out with -solid / CTOP_SOLID), and termbox is switched
to Output256 so colors render correctly. Replace hardcoded colors in the
compact and single views with ctheme portrait slots.

colors.go

@@ -1,61 +1,24 @@
 package main
 
 import (
-	"regexp"
+	"github.com/bcicen/ctop/theme"
 
 	ui "github.com/gizak/termui"
 )
 
-/*
-Valid colors:
-	ui.ColorDefault
-	ui.ColorBlack
-	ui.ColorRed
-	ui.ColorGreen
-	ui.ColorYellow
-	ui.ColorBlue
-	ui.ColorMagenta
-	ui.ColorCyan
-	ui.ColorWhite
-*/
+var ColorMap map[string]ui.Attribute
 
-var ColorMap = map[string]ui.Attribute{
-	"fg":                 ui.ColorWhite,
-	"bg":                 ui.ColorDefault,
-	"block.bg":           ui.ColorDefault,
-	"border.bg":          ui.ColorDefault,
-	"border.fg":          ui.ColorWhite,
-	"label.bg":           ui.ColorDefault,
-	"label.fg":           ui.ColorGreen,
-	"menu.text.fg":       ui.ColorWhite,
-	"menu.text.bg":       ui.ColorDefault,
-	"menu.border.fg":     ui.ColorCyan,
-	"menu.label.fg":      ui.ColorGreen,
-	"header.fg":          ui.ColorBlack,
-	"header.bg":          ui.ColorWhite,
-	"gauge.bar.bg":       ui.ColorGreen,
-	"gauge.percent.fg":   ui.ColorWhite,
-	"linechart.axes.fg":  ui.ColorDefault,
-	"linechart.line.fg":  ui.ColorGreen,
-	"mbarchart.bar.bg":   ui.ColorGreen,
-	"mbarchart.num.fg":   ui.ColorWhite,
-	"mbarchart.text.fg":  ui.ColorWhite,
-	"par.text.fg":        ui.ColorWhite,
-	"par.text.bg":        ui.ColorDefault,
-	"par.text.hi":        ui.ColorBlack,
-	"sparkline.line.fg":  ui.ColorGreen,
-	"sparkline.title.fg": ui.ColorWhite,
-	"status.ok":          ui.ColorGreen,
-	"status.warn":        ui.ColorYellow,
-	"status.danger":      ui.ColorRed,
+// SetColorMap installs the color scheme for the currently selected theme
+func SetColorMap() {
+	ColorMap = theme.BuildColorMap()
 }
 
+// InvertColorMap switches to the inverse (light/dark) flavor
 func InvertColorMap() {
-	re := regexp.MustCompile(".*.fg")
-	for k := range ColorMap {
-		if re.FindAllString(k, 1) != nil {
-			ColorMap[k] = ui.ColorBlack
-		}
+	if theme.Current() == theme.Latte {
+		theme.Set(theme.Mocha)
+	} else {
+		theme.Set(theme.Latte)
 	}
-	ColorMap["par.text.hi"] = ui.ColorWhite
-}
+	SetColorMap()
+}