Did a lot of work off-repo, basically init

ui/theme.go

@@ -0,0 +1,47 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+// A Theme is a map of string names to styles. Themes can be passed by reference to components
+// to set their styles. Some components will depend upon the basic keys, but most components
+// may use keys specific to their component. If a theme value cannot be found, then the
+// `DefaultTheme` value will be used, instead. An updated list of theme keys can be found on
+// the default theme.
+type Theme map[string]tcell.Style
+
+func (theme *Theme) GetOrDefault(key string) tcell.Style {
+	if theme != nil {
+		if val, ok := (*theme)[key]; ok {
+			return val
+		}
+	}
+	
+	if val, ok := DefaultTheme[key]; ok {
+		return val
+	} else {
+		panic(fmt.Sprintf("key \"%v\" not present in default theme", key))
+	}
+}
+
+// DefaultTheme uses only the first 16 colors present in most colored terminals.
+var DefaultTheme = Theme{
+	"Normal":          tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"Button":          tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorWhite),
+	"InputField":      tcell.Style{}.Foreground(tcell.ColorWhite).Background(tcell.ColorBlack),
+	"MenuBar":         tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorSilver),
+	"MenuBarSelected": tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"Menu":            tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorSilver),
+	"MenuSelected":    tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"QuickChar":       tcell.Style{}.Foreground(tcell.ColorYellow).Background(tcell.ColorBlack),
+	"Tab":             tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"TabContainer":    tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"TabSelected":     tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorSilver),
+	"TextEdit":        tcell.Style{}.Foreground(tcell.ColorSilver).Background(tcell.ColorBlack),
+	"TextEditColumn":  tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorGray),
+	"Window":          tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorSilver),
+	"WindowHeader":    tcell.Style{}.Foreground(tcell.ColorBlack).Background(tcell.ColorWhite),
+}