Add api command

cmd/sing-box/cmd_api_mode.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+var commandAPIMode = &cobra.Command{
+	Use:   "mode",
+	Short: "Print the current clash mode",
+	Args:  cobra.NoArgs,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return runAPIMode()
+	},
+}
+
+func init() {
+	commandAPIRoot.AddCommand(commandAPIMode)
+}
+
+func runAPIMode() error {
+	clientConn, client, err := createAPIClient()
+	if err != nil {
+		return err
+	}
+	defer clientConn.Close()
+	modeStatus, err := client.GetClashModeStatus(globalCtx, &emptypb.Empty{})
+	if err != nil {
+		return err
+	}
+	currentMode := modeStatus.GetCurrentMode()
+	if currentMode == "" {
+		currentMode = "-"
+	}
+	os.Stdout.WriteString(currentMode + "\n")
+	return nil
+}