add reading from config file

change-wallpaper.go

@@ -20,7 +20,11 @@ const (
 	wallpaperDir = "Pictures/wallpapers/wallhaven"
 )
 
-var topics = []string{
+type Config struct {
+	Topics []string `json:"topics"`
+}
+
+var defaultTopics = []string{
 	"132262 - Mobuseka",
 	"konosuba",
 	"bunny girl senpai",
@@ -30,6 +34,24 @@ var topics = []string{
 	"eminence in shadow",
 }
 
+func loadConfig() []string {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return defaultTopics
+	}
+	configPath := filepath.Join(homeDir, ".config", "change-wallpaper", "config.json")
+	file, err := os.Open(configPath)
+	if err != nil {
+		return defaultTopics
+	}
+	defer file.Close()
+	var cfg Config
+	if err := json.NewDecoder(file).Decode(&cfg); err != nil || len(cfg.Topics) == 0 {
+		return defaultTopics
+	}
+	return cfg.Topics
+}
+
 type WallhavenResponse struct {
 	Data []struct {
 		Path string `json:"path"`
@@ -40,6 +62,9 @@ func main() {
 	// Initialize random source
 	r := rand.New(rand.NewSource(time.Now().UnixNano()))
 
+	// Load topics from config or use defaults
+	topics := loadConfig()
+
 	// Check if a file path was provided as argument
 	if len(os.Args) > 1 {
 		imgPath := os.Args[1]
@@ -63,7 +88,7 @@ func main() {
 	}
 
 	// Download and set new wallpaper
-	newWallpaper, topic := downloadRandomWallpaper(wallpaperPath, r)
+	newWallpaper, topic := downloadRandomWallpaper(wallpaperPath, r, topics)
 	if newWallpaper != "" {
 		changeWallpaper(newWallpaper, topic)
 	} else {
@@ -72,7 +97,7 @@ func main() {
 	}
 }
 
-func downloadRandomWallpaper(wallpaperPath string, r *rand.Rand) (string, string) {
+func downloadRandomWallpaper(wallpaperPath string, r *rand.Rand, topics []string) (string, string) {
 	// Select random topic
 	topic := topics[r.Intn(len(topics))]
 	var query string