feat(hyprland): generate Lua monitor config instead of hyprlang

Write hl.monitor({...}) calls to ~/.config/hypr/monitors.lua (loaded via
require("monitors") in hyprland.lua) instead of monitor= lines in
monitors.conf. Prepare now strips hl.monitor lines with disabled = true,
and generateConf omits mode/position so Hyprland uses its defaults.
Update README and example config to match.

internal/backend/hyprland.go

@@ -19,17 +19,17 @@ import (
 // hyprlandBackend implements Backend for the Hyprland compositor.
 //
 // Monitor queries: hyprctl -j monitors all
-// Layout application: write ~/.config/hypr/monitors.conf + hyprctl reload
+// Layout application: write ~/.config/hypr/monitors.lua + 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:
+// The daemon writes a Lua config file that hyprland.lua loads via:
 //
-//	source = os.getenv("HOME") .. "/.config/hypr/monitors.conf"
+//	require("monitors")
 type hyprlandBackend struct {
 	logger *slog.Logger
 
 	// outputPath overrides the generated monitor config file path.
-	// Empty means the default: ~/.config/hypr/monitors.conf.
+	// Empty means the default: ~/.config/hypr/monitors.lua.
 	// Read from backend_config.output_path at construction time.
 	outputPath string
 
@@ -45,7 +45,7 @@ type hyprlandBackend struct {
 // backend_config section. Hyprland supports:
 //
 //	output_path — path to the generated monitor config file
-//	              (default: ~/.config/hypr/monitors.conf)
+//	              (default: ~/.config/hypr/monitors.lua)
 func NewHyprland(logger *slog.Logger, opts map[string]any) (Backend, error) {
 	sig := os.Getenv("HYPRLAND_INSTANCE_SIGNATURE")
 	if sig == "" {
@@ -120,7 +120,7 @@ func (h *hyprlandBackend) ApplyLayout(ctx context.Context, monitors []MonitorCon
 
 	// Atomic write: temp file, write, fsync, rename.
 	if err := atomicWrite(destPath, []byte(content)); err != nil {
-		return fmt.Errorf("write monitors.conf: %w", err)
+		return fmt.Errorf("write monitor config: %w", err)
 	}
 
 	// Reload Hyprland config to apply changes atomically.
@@ -171,10 +171,10 @@ func (h *hyprlandBackend) WriteConfig(ctx context.Context, monitors []MonitorCon
 	return nil
 }
 
-// Prepare removes all monitor=...,disabled lines from the monitors.conf
-// file. This prevents the "no active displays" issue when Hyprland starts
-// with a stale config. If the resulting file would be empty (or doesn't
-// exist), a generic built-in entry is written as a fallback.
+// Prepare removes all hl.monitor({...disabled = true...}) lines from the
+// monitor config file. This prevents the "no active displays" issue when
+// Hyprland starts with a stale config. If the resulting file would be empty
+// (or doesn't exist), a generic built-in entry is written as a fallback.
 func (h *hyprlandBackend) Prepare(ctx context.Context) error {
 	destPath, err := h.resolveOutputPath()
 	if err != nil {
@@ -197,7 +197,7 @@ func (h *hyprlandBackend) Prepare(ctx context.Context) error {
 		if trimmed == "" {
 			continue
 		}
-		if strings.HasPrefix(trimmed, "monitor=") && strings.HasSuffix(trimmed, ",disabled") {
+		if strings.Contains(trimmed, "disabled = true") {
 			continue
 		}
 		cleaned = append(cleaned, line)
@@ -205,7 +205,7 @@ func (h *hyprlandBackend) Prepare(ctx context.Context) error {
 
 	content := strings.Join(cleaned, "\n")
 	if strings.TrimSpace(content) == "" {
-		content = "monitor=eDP-1,preferred,auto,1\n"
+		content = "hl.monitor({ output = \"eDP-1\" })\n"
 	}
 
 	if err := atomicWrite(destPath, []byte(content)); err != nil {
@@ -330,12 +330,21 @@ func eventData(line string) string {
 	return line[idx+2:]
 }
 
-// generateConf produces the content of a Hyprland-compatible monitor config file.
-// Old-style syntax: monitor=name,mode,pos,scale
-// Disabled monitors: monitor=name,disabled
+// generateConf produces the content of a Hyprland Lua monitor config file.
+// Enabled monitors: hl.monitor({ output = "eDP-1", mode = "1920x1200@60", position = "0x0", scale = 1 })
+// Disabled monitors: hl.monitor({ output = "DP-1", disabled = true })
+//
+// The file is meant to be loaded from hyprland.lua via:
+//
+//	require("monitors")
+//
+// mode and position are omitted when empty so Hyprland uses its defaults
+// ("preferred" and "auto" respectively).
 func (h *hyprlandBackend) generateConf(monitors []MonitorConfig) string {
 	var buf strings.Builder
 
+	buf.WriteString("-- Generated by monitor-lets-go. Do not edit.\n")
+
 	// Ensure disabled monitors appear last so Hyprland migrates
 	// workspaces to enabled ones first.
 	var disabled []MonitorConfig
@@ -346,36 +355,44 @@ func (h *hyprlandBackend) generateConf(monitors []MonitorConfig) string {
 			continue
 		}
 
-		mode := m.Mode
-		if mode == "" {
-			mode = "preferred"
-		}
-		pos := m.Position
-		if pos == "" {
-			pos = "auto"
-		}
-		scale := formatScale(m.Scale)
+		buf.WriteString("hl.monitor({ output = ")
+		buf.WriteString(luaQuote(m.Name))
 
-		buf.WriteString("monitor=")
-		buf.WriteString(m.Name)
-		buf.WriteString(",")
-		buf.WriteString(mode)
-		buf.WriteString(",")
-		buf.WriteString(pos)
-		buf.WriteString(",")
-		buf.WriteString(scale)
-		buf.WriteString("\n")
+		if m.Mode != "" {
+			buf.WriteString(", mode = ")
+			buf.WriteString(luaQuote(m.Mode))
+		}
+		if m.Position != "" {
+			buf.WriteString(", position = ")
+			buf.WriteString(luaQuote(m.Position))
+		}
+		buf.WriteString(", scale = ")
+		buf.WriteString(formatScale(m.Scale))
+
+		buf.WriteString(" })\n")
 	}
 
 	for _, m := range disabled {
-		buf.WriteString("monitor=")
-		buf.WriteString(m.Name)
-		buf.WriteString(",disabled\n")
+		buf.WriteString("hl.monitor({ output = ")
+		buf.WriteString(luaQuote(m.Name))
+		buf.WriteString(", disabled = true })\n")
 	}
 
 	return buf.String()
 }
 
+// luaQuote wraps s in double quotes, escaping characters that would break
+// a Lua string literal.
+func luaQuote(s string) string {
+	replacer := strings.NewReplacer(
+		"\\", "\\\\",
+		"\"", "\\\"",
+		"\n", "\\n",
+		"\r", "\\r",
+	)
+	return "\"" + replacer.Replace(s) + "\""
+}
+
 // ensureCleanLayout adds disabled entries for any physically connected
 // monitor that is not present in the target layout. This prevents
 // monitors from remaining enabled when switching to a mode that only
@@ -431,7 +448,7 @@ func (h *hyprlandBackend) hyprConfigDir() (string, error) {
 
 // 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.
+// Otherwise the default ~/.config/hypr/monitors.lua is returned.
 func (h *hyprlandBackend) resolveOutputPath() (string, error) {
 	if h.outputPath != "" {
 		p := h.outputPath
@@ -452,7 +469,7 @@ func (h *hyprlandBackend) resolveOutputPath() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(configDir, "monitors.conf"), nil
+	return filepath.Join(configDir, "monitors.lua"), nil
 }
 
 func (h *hyprlandBackend) Close() error {

internal/config/config.go

@@ -53,7 +53,7 @@ type Config struct {
 	// OutputPath overrides the generated monitor config file path.
 	// Supports ~ for home directory expansion.
 	// Deprecated: use backend_config.output_path instead.
-	// Empty means the default: ~/.config/hypr/monitors.conf.
+	// Empty means the default: ~/.config/hypr/monitors.lua.
 	OutputPath string `yaml:"output_path"`
 
 	// BackendConfig holds backend-specific configuration options.