Start with dark and light themes

src/config/config.go

@@ -3,16 +3,21 @@ package config
 import (
 	"encoding/json"
 	"os"
+
+	"github.com/gizak/termui"
 )
 
 // Config is the definition of a Config struct
 type Config struct {
 	SlackToken string `json:"slack_token"`
+	Theme      string `json:"theme"`
 }
 
 // NewConfig loads the config file and returns a Config struct
 func NewConfig(filepath string) (*Config, error) {
-	var cfg Config
+	cfg := Config{
+		Theme: "dark",
+	}
 
 	file, err := os.Open(filepath)
 	if err != nil {
@@ -23,5 +28,16 @@ func NewConfig(filepath string) (*Config, error) {
 		return &cfg, err
 	}
 
+	if cfg.Theme == "light" {
+		termui.ColorMap = map[string]termui.Attribute{
+			"fg":           termui.ColorBlack,
+			"bg":           termui.ColorDefault,
+			"border.fg":    termui.ColorBlack,
+			"label.fg":     termui.ColorGreen,
+			"par.fg":       termui.ColorYellow,
+			"par.label.bg": termui.ColorWhite,
+		}
+	}
+
 	return &cfg, nil
 }