Simplify config: flags for settings, dots-only for addresses

- Move listen_port and broadcast_addr from TOML to CLI flags
- Remove colon format support for universe addresses (dots only)
- Config file now contains only mappings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config.example.toml

@@ -1,14 +1,9 @@
 # artmap configuration
+# Run with: go run . -config config.toml [-port 6454] [-broadcast 2.255.255.255]
 
-[settings]
+# Universe address formats:
-listen_port = 6454              # ArtNet port (default: 6454)
-broadcast_addr = "2.255.255.255" # ArtNet broadcast address
-
-# Universe address formats supported:
 #   "0.0.1"  - Net.Subnet.Universe
-#   "0:0:1"  - Net:Subnet:Universe
 #   1        - Universe number only (net=0, subnet=0)
-#   "1"      - Universe number as string
 
 # Example: Remap entire universe
 # Maps all 512 channels from universe 0 to universe 5

config/config.go

@@ -11,16 +11,9 @@ import (
 
 // Config represents the application configuration
 type Config struct {
-	Settings Settings  `toml:"settings"`
 	Mappings []Mapping `toml:"mapping"`
 }
 
-// Settings contains global configuration options
-type Settings struct {
-	ListenPort    int    `toml:"listen_port"`
-	BroadcastAddr string `toml:"broadcast_addr"`
-}
-
 // Mapping represents a single channel mapping rule
 type Mapping struct {
 	// Source
@@ -72,9 +65,8 @@ func (u *UniverseAddr) UnmarshalTOML(data interface{}) error {
 	}
 }
 
-// ParseUniverseAddr parses various universe address formats:
+// ParseUniverseAddr parses universe address formats:
-// - "0.0.1" or "0.0.1" - Net.Subnet.Universe
+// - "0.0.1" - Net.Subnet.Universe
-// - "0:0:1" - Net:Subnet:Universe
 // - "1" - Universe number only
 func ParseUniverseAddr(s string) (artnet.Universe, error) {
 	s = strings.TrimSpace(s)
@@ -82,7 +74,9 @@ func ParseUniverseAddr(s string) (artnet.Universe, error) {
 	// Try Net.Subnet.Universe format
 	if strings.Contains(s, ".") {
 		parts := strings.Split(s, ".")
-		if len(parts) == 3 {
+		if len(parts) != 3 {
+			return 0, fmt.Errorf("invalid universe address format: %s (expected net.subnet.universe)", s)
+		}
 		net, err := strconv.Atoi(parts[0])
 		if err != nil {
 			return 0, fmt.Errorf("invalid net: %w", err)
@@ -97,29 +91,8 @@ func ParseUniverseAddr(s string) (artnet.Universe, error) {
 		}
 		return artnet.NewUniverse(uint8(net), uint8(subnet), uint8(universe)), nil
 	}
-	}
 
-	// Try Net:Subnet:Universe format
+	// Plain universe number
-	if strings.Contains(s, ":") {
-		parts := strings.Split(s, ":")
-		if len(parts) == 3 {
-			net, err := strconv.Atoi(parts[0])
-			if err != nil {
-				return 0, fmt.Errorf("invalid net: %w", err)
-			}
-			subnet, err := strconv.Atoi(parts[1])
-			if err != nil {
-				return 0, fmt.Errorf("invalid subnet: %w", err)
-			}
-			universe, err := strconv.Atoi(parts[2])
-			if err != nil {
-				return 0, fmt.Errorf("invalid universe: %w", err)
-			}
-			return artnet.NewUniverse(uint8(net), uint8(subnet), uint8(universe)), nil
-		}
-	}
-
-	// Try plain universe number
 	u, err := strconv.Atoi(s)
 	if err != nil {
 		return 0, fmt.Errorf("invalid universe address format: %s", s)
@@ -131,10 +104,6 @@ func ParseUniverseAddr(s string) (artnet.Universe, error) {
 func Load(path string) (*Config, error) {
 	var cfg Config
 
-	// Set defaults
-	cfg.Settings.ListenPort = artnet.Port
-	cfg.Settings.BroadcastAddr = "2.255.255.255"
-
 	if _, err := toml.DecodeFile(path, &cfg); err != nil {
 		return nil, fmt.Errorf("failed to load config: %w", err)
 	}

main.go

@@ -24,6 +24,8 @@ type App struct {
 
 func main() {
 	configPath := flag.String("config", "config.toml", "path to config file")
+	listenPort := flag.Int("port", artnet.Port, "ArtNet listen port")
+	broadcastAddr := flag.String("broadcast", "2.255.255.255", "ArtNet broadcast address")
 	flag.Parse()
 
 	// Load config
@@ -49,7 +51,7 @@ func main() {
 	}
 
 	// Create sender
-	sender, err := artnet.NewSender(cfg.Settings.BroadcastAddr)
+	sender, err := artnet.NewSender(*broadcastAddr)
 	if err != nil {
 		log.Fatalf("failed to create sender: %v", err)
 	}
@@ -68,7 +70,7 @@ func main() {
 	}
 
 	// Create receiver
-	receiver, err := artnet.NewReceiver(cfg.Settings.ListenPort, app)
+	receiver, err := artnet.NewReceiver(*listenPort, app)
 	if err != nil {
 		log.Fatalf("failed to create receiver: %v", err)
 	}
@@ -78,8 +80,8 @@ func main() {
 	receiver.Start()
 	discovery.Start()
 
-	log.Printf("listening on port %d", cfg.Settings.ListenPort)
+	log.Printf("listening on port %d", *listenPort)
-	log.Printf("broadcasting to %s", cfg.Settings.BroadcastAddr)
+	log.Printf("broadcasting to %s", *broadcastAddr)
 
 	// Wait for interrupt
 	sigChan := make(chan os.Signal, 1)