wallpaper: handle initial load better, add dms randr command for quick physical scale retrieval

core/cmd/dms/commands_randr.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
+	"github.com/spf13/cobra"
+)
+
+var randrCmd = &cobra.Command{
+	Use:   "randr",
+	Short: "Query output display information",
+	Long:  "Query Wayland compositor for output names, scales, resolutions and refresh rates via zwlr-output-management",
+	Run:   runRandr,
+}
+
+func init() {
+	randrCmd.Flags().Bool("json", false, "Output in JSON format")
+}
+
+type randrJSON struct {
+	Outputs []randrOutput `json:"outputs"`
+}
+
+func runRandr(cmd *cobra.Command, args []string) {
+	outputs, err := queryRandr()
+	if err != nil {
+		log.Fatalf("%v", err)
+	}
+
+	jsonFlag, _ := cmd.Flags().GetBool("json")
+
+	if jsonFlag {
+		data, err := json.Marshal(randrJSON{Outputs: outputs})
+		if err != nil {
+			log.Fatalf("failed to marshal JSON: %v", err)
+		}
+		fmt.Println(string(data))
+		return
+	}
+
+	for i, out := range outputs {
+		if i > 0 {
+			fmt.Println()
+		}
+		status := "enabled"
+		if !out.Enabled {
+			status = "disabled"
+		}
+		fmt.Printf("%s (%s)\n", out.Name, status)
+		fmt.Printf("  Scale:      %.4g\n", out.Scale)
+		fmt.Printf("  Resolution: %dx%d\n", out.Width, out.Height)
+		if out.Refresh > 0 {
+			fmt.Printf("  Refresh:    %.2f Hz\n", float64(out.Refresh)/1000.0)
+		}
+	}
+}