cmd/evm: accept --input for disasm command (#20548)

cmd/evm/disasm.go

@@ -34,17 +34,22 @@ var disasmCommand = cli.Command{
 }
 
 func disasmCmd(ctx *cli.Context) error {
-	if len(ctx.Args().First()) == 0 {
-		return errors.New("filename required")
-	}
-
+	var in string
+	switch {
+	case len(ctx.Args().First()) > 0:
 		fn := ctx.Args().First()
-	in, err := ioutil.ReadFile(fn)
+		input, err := ioutil.ReadFile(fn)
 		if err != nil {
 			return err
 		}
+		in = string(input)
+	case ctx.GlobalIsSet(InputFlag.Name):
+		in = ctx.GlobalString(InputFlag.Name)
+	default:
+		return errors.New("Missing filename or --input value")
+	}
 
-	code := strings.TrimSpace(string(in))
+	code := strings.TrimSpace(in)
 	fmt.Printf("%v\n", code)
 	return asm.PrintDisassembled(code)
 }