Add api command

cmd/sing-box/cmd_api_group_show.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/spf13/cobra"
+)
+
+var commandAPIGroupShow = &cobra.Command{
+	Use:   "show <group>",
+	Short: "Show an outbound group",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return runAPIGroupShow(args[0])
+	},
+}
+
+func init() {
+	commandAPIGroup.AddCommand(commandAPIGroupShow)
+}
+
+func runAPIGroupShow(groupTag string) error {
+	clientConn, client, err := createAPIClient()
+	if err != nil {
+		return err
+	}
+	defer clientConn.Close()
+	groups, err := fetchGroups(client)
+	if err != nil {
+		return err
+	}
+	for _, group := range groups {
+		if group.GetTag() != groupTag {
+			continue
+		}
+		block := blockWriter{}
+		block.addLine("Tag", group.GetTag())
+		block.addLine("Type", group.GetType())
+		block.addLine("Selected", group.GetSelected())
+		block.flush()
+		table := tableWriter{
+			header: []string{"TAG", "TYPE", "DELAY"},
+		}
+		for _, item := range group.GetItems() {
+			table.addRow(item.GetTag(), item.GetType(), formatDelay(item.GetUrlTestDelay()))
+		}
+		table.flush()
+		return nil
+	}
+	return E.New("group not found: ", groupTag)
+}