qmk-rgb/cmd/wobkey/rgb/brightness.go

package rgb

import (
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"github.com/wobkey/rgb/internal/rgb"
	"github.com/wobkey/rgb/internal/via"
)

func NewBrightnessCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "brightness <val>",
		Short: "Set RGB brightness",
		Long:  "Set the RGB brightness value (0-255).",
		Args:  cobra.ExactArgs(1),
		Run: func(cmd *cobra.Command, args []string) {
			val, err := ParseUint8(args[0])
			if err != nil {
				fmt.Fprintf(os.Stderr, "Error: %v\n", err)
				os.Exit(1)
			}

			proto, _, err := OpenDevice()
			if err != nil {
				fmt.Fprintf(os.Stderr, "Error: %v\n", err)
				os.Exit(1)
			}
			defer proto.Close()

			if err := proto.EnableHandshake(); err != nil {
				fmt.Fprintf(os.Stderr, "Handshake failed: %v\n", err)
				os.Exit(1)
			}

			if err := proto.SetValue(via.RGBLight, uint8(rgb.Brightness), val); err != nil {
				fmt.Fprintf(os.Stderr, "Error setting brightness: %v\n", err)
				os.Exit(1)
			}

			fmt.Printf("Brightness set to %d\n", val)
		},
	}
}