Refactor table management to use a dedicated API and improve command handling.

internal/table/table.go

@@ -0,0 +1,51 @@
+package table
+
+import (
+	"git.kor-elf.net/kor-elf-shield/go-nftables-client/family"
+	"git.kor-elf.net/kor-elf-shield/go-nftables-client/internal/command"
+)
+
+type API interface {
+	// AddTable adds a new table.
+	//
+	// This command is equivalent to:
+	//     nft add table (ip|ip6|inet|arp|bridge) {table_name}
+	Add(family family.Type, tableName string) error
+
+	// DeleteTable deletes a table.
+	//
+	// This command is equivalent to:
+	//     nft delete table (ip|ip6|inet|arp|bridge) {table_name}
+	Delete(family family.Type, tableName string) error
+
+	// ClearTable clears all rules in a table.
+	//
+	// This command is equivalent to:
+	//     nft flush table (ip|ip6|inet|arp|bridge) {table_name}
+	Clear(family family.Type, tableName string) error
+}
+
+type table struct {
+	command command.NFT
+}
+
+func New(command command.NFT) API {
+	return &table{
+		command: command,
+	}
+}
+
+func (t *table) Add(family family.Type, tableName string) error {
+	args := []string{"add", "table", family.String(), tableName}
+	return t.command.Run(args...)
+}
+
+func (t *table) Delete(family family.Type, tableName string) error {
+	args := []string{"delete", "table", family.String(), tableName}
+	return t.command.Run(args...)
+}
+
+func (t *table) Clear(family family.Type, tableName string) error {
+	args := []string{"flush", "table", family.String(), tableName}
+	return t.command.Run(args...)
+}