feat: add optional output_path, change default to monitors.conf

internal/backend/hyprland.go

@@ -19,23 +19,30 @@ import (
 // hyprlandBackend implements Backend for the Hyprland compositor.
 //
 // Monitor queries: hyprctl -j monitors all
-// Layout application: write ~/.config/hypr/monitor-lets-go-monitors.conf + hyprctl reload
+// Layout application: write ~/.config/hypr/monitors.conf + hyprctl reload
 // Hotplug events: socket2 unix socket ($XDG_RUNTIME_DIR/hypr/$HIS/.socket2.sock)
 //
 // The user must add the following line to their hyprland.lua:
 //
-//	source = os.getenv("HOME") .. "/.config/hypr/monitor-lets-go-monitors.conf"
+//	source = os.getenv("HOME") .. "/.config/hypr/monitors.conf"
 type hyprlandBackend struct {
 	logger *slog.Logger
 
+	// outputPath overrides the generated monitor config file path.
+	// Empty means the default: ~/.config/hypr/monitors.conf.
+	outputPath string
+
 	// conn is the current socket2 connection; guarded by mu.
-	conn   net.Conn
-	mu     sync.Mutex
+	conn net.Conn
+	mu   sync.Mutex
 }
 
 // NewHyprland creates a Hyprland backend. The backend auto-detects the
 // Hyprland instance signature from the environment.
-func NewHyprland(logger *slog.Logger) (Backend, error) {
+//
+// outputPath overrides the generated monitor config file location.
+// When empty, defaults to ~/.config/hypr/monitors.conf.
+func NewHyprland(logger *slog.Logger, outputPath string) (Backend, error) {
 	sig := os.Getenv("HYPRLAND_INSTANCE_SIGNATURE")
 	if sig == "" {
 		return nil, errors.New("HYPRLAND_INSTANCE_SIGNATURE is not set; is Hyprland running?")
@@ -50,7 +57,7 @@ func NewHyprland(logger *slog.Logger) (Backend, error) {
 		return nil, fmt.Errorf("socket2 not found at %s: %w", socketPath, err)
 	}
 
-	return &hyprlandBackend{logger: logger}, nil
+	return &hyprlandBackend{logger: logger, outputPath: outputPath}, nil
 }
 
 func (h *hyprlandBackend) Name() string { return "hyprland" }
@@ -77,11 +84,10 @@ func (h *hyprlandBackend) GetMonitors(ctx context.Context) ([]MonitorInfo, error
 func (h *hyprlandBackend) ApplyLayout(ctx context.Context, monitors []MonitorConfig) error {
 	content := h.generateConf(monitors)
 
-	configDir, err := h.hyprConfigDir()
+	destPath, err := h.resolveOutputPath()
 	if err != nil {
-		return fmt.Errorf("hypr config dir: %w", err)
+		return fmt.Errorf("resolve output path: %w", err)
 	}
-	destPath := filepath.Join(configDir, "monitor-lets-go-monitors.conf")
 
 	// Atomic write: temp file, write, fsync, rename.
 	if err := atomicWrite(destPath, []byte(content)); err != nil {
@@ -285,6 +291,32 @@ func (h *hyprlandBackend) hyprConfigDir() (string, error) {
 	return dir, nil
 }
 
+// resolveOutputPath returns the path for the generated monitor config file.
+// When outputPath is set (via constructor), it is used after ~ expansion.
+// Otherwise the default ~/.config/hypr/monitors.conf is returned.
+func (h *hyprlandBackend) resolveOutputPath() (string, error) {
+	if h.outputPath != "" {
+		p := h.outputPath
+		if strings.HasPrefix(p, "~") {
+			home, err := os.UserHomeDir()
+			if err != nil {
+				return "", fmt.Errorf("resolve home directory: %w", err)
+			}
+			p = filepath.Join(home, p[1:])
+		}
+		if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
+			return "", fmt.Errorf("create output directory: %w", err)
+		}
+		return p, nil
+	}
+
+	configDir, err := h.hyprConfigDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(configDir, "monitors.conf"), nil
+}
+
 func (h *hyprlandBackend) Close() error {
 	h.mu.Lock()
 	defer h.mu.Unlock()

internal/config/config.go

@@ -50,6 +50,11 @@ type Config struct {
 	// Uses *bool so we can distinguish "not set" from explicit false.
 	RestoreOnExit *bool `yaml:"restore_on_exit"`
 
+	// OutputPath overrides the generated monitor config file path.
+	// Supports ~ for home directory expansion.
+	// Empty means the default: ~/.config/hypr/monitors.conf.
+	OutputPath string `yaml:"output_path"`
+
 	// External lists monitor identifiers that trigger docked mode.
 	// Each entry is a name (DP-1) or a desc: prefix (desc:Dell U2723QE).
 	External []string `yaml:"external"`