Add Batch API for building and executing batched nftables commands.

contract/batch.go

@@ -0,0 +1,31 @@
+package contract
+
+import (
+	"git.kor-elf.net/kor-elf-shield/go-nftables-client/contract/batch"
+)
+
+// BatchBuilder is an API for building a batch of commands.
+type BatchBuilder interface {
+	// Clear clears all rules.
+	//
+	// This command is equivalent to:
+	//    nft flush ruleset
+	Clear() error
+
+	// Table returns an API for working with tables.
+	Table() batch.Table
+
+	// Chain returns an API for working with chains.
+	Chain() batch.Chain
+
+	// Rule returns an API for working with rules.
+	Rule() batch.Rule
+
+	// Build returns a batch of commands.
+	Build() Batch
+}
+
+type Batch interface {
+	// Args returns the arguments of the batch.
+	Args() []string
+}