Add api command

cmd/sing-box/cmd_api_group_list.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"github.com/spf13/cobra"
+)
+
+var commandAPIGroupList = &cobra.Command{
+	Use:   "list",
+	Short: "List outbound groups",
+	Args:  cobra.NoArgs,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return runAPIGroupList()
+	},
+}
+
+func init() {
+	commandAPIGroup.AddCommand(commandAPIGroupList)
+}
+
+func runAPIGroupList() error {
+	clientConn, client, err := createAPIClient()
+	if err != nil {
+		return err
+	}
+	defer clientConn.Close()
+	groups, err := fetchGroups(client)
+	if err != nil {
+		return err
+	}
+	table := tableWriter{
+		header:       []string{"TAG", "TYPE", "SELECTED"},
+		emptyMessage: "no groups",
+	}
+	for _, group := range groups {
+		table.addRow(group.GetTag(), group.GetType(), group.GetSelected())
+	}
+	table.flush()
+	return nil
+}