lots of fixes and additions:

- add color and color config support
- fix epub parsing
- add variable margin (left and right arrow keys)
- add help screen (hit `?`)
- add config file support

cmd/colors.go

@@ -0,0 +1,63 @@
+package cmd
+
+import (
+	"github.com/charmbracelet/lipgloss"
+)
+
+type ColorSetting struct {
+	Title   string `koanf:"title"`
+	Chapter string `koanf:"chapter"`
+	Body    string `koanf:"body"`
+}
+
+type Colors struct {
+	Title   lipgloss.Style
+	Chapter lipgloss.Style
+	Body    lipgloss.Style
+}
+
+func SetColorconfig(defaultdark, defaultlight ColorSetting, conf *Config) Colors {
+	var defaults, user ColorSetting
+
+	switch conf.Darkmode {
+	case true:
+		defaults = defaultdark
+		user = conf.ColorDark
+	default:
+		defaults = defaultlight
+		user = conf.ColorLight
+	}
+
+	var colors Colors
+	var fg string
+
+	border := lipgloss.RoundedBorder()
+	border.Right = "├"
+	styletitle := lipgloss.NewStyle().BorderStyle(border).Padding(0, 1)
+
+	if user.Title != "" {
+		fg = user.Title
+	} else {
+		fg = defaults.Title
+	}
+
+	colors.Title = styletitle.Foreground(lipgloss.Color(fg))
+
+	if user.Chapter != "" {
+		fg = user.Chapter
+	} else {
+		fg = defaults.Chapter
+	}
+
+	colors.Chapter = lipgloss.NewStyle().Foreground(lipgloss.Color(fg))
+
+	if user.Body != "" {
+		fg = user.Body
+	} else {
+		fg = defaults.Body
+	}
+
+	colors.Body = lipgloss.NewStyle().Foreground(lipgloss.Color(fg))
+
+	return colors
+}