Add api command

cmd/sing-box/cmd_api_mode_set.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"github.com/sagernet/sing-box/daemon"
+
+	"github.com/spf13/cobra"
+)
+
+var commandAPIModeSet = &cobra.Command{
+	Use:   "set <mode>",
+	Short: "Set the clash mode",
+	Long:  "Set the clash mode.\n\nThe value is not validated against the mode list: setting an unknown mode reports success.",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return runAPIModeSet(args[0])
+	},
+}
+
+func init() {
+	commandAPIMode.AddCommand(commandAPIModeSet)
+}
+
+func runAPIModeSet(mode string) error {
+	clientConn, client, err := createAPIClient()
+	if err != nil {
+		return err
+	}
+	defer clientConn.Close()
+	_, err = client.SetClashMode(globalCtx, &daemon.ClashMode{Mode: mode})
+	return err
+}