generate: Emit stub for message decoding function

generate/generate.go

@@ -167,6 +167,15 @@ func (this *Generator) generateMessage(method uint16, message Message) (n int, e
 	nn, err = this.println()
 	n += nn; if err != nil { return n, err }
 
+	// Method method
+	nn, err = this.iprintf("\n// Method returns the message's method number.\n")
+	n += nn; if err != nil { return n, err }
+	nn, err = this.iprintf(
+		"func(this *%s) Method() uint16 { return 0x%04X }\n",
+		this.resolveMessageName(message.Name),
+		method)
+	n += nn; if err != nil { return n, err }
+
 	// Encode method
 	nn, err = this.iprintf("\n// Encode encodes this message's tag and value.\n")
 	n += nn; if err != nil { return n, err }
@@ -201,7 +210,9 @@ func (this *Generator) generateMessage(method uint16, message Message) (n int, e
 		this.resolveMessageName(message.Name))
 	n += nn; if err != nil { return n, err }
 	this.push()
-		// TODO
+		// TODO this is a stub
+		nn, err = this.iprintf("return n, nil\n")
+		n += nn; if err != nil { return n, err }
 	this.pop()
 	nn, err = this.iprintf("}\n")
 	n += nn; if err != nil { return n, err }