cli/smartcontract: allow to use 0x-prefixed hashes in generate

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>

cli/smartcontract/generate.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"strings"
 
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/binding"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -58,7 +59,7 @@ func contractGenerateWrapper(ctx *cli.Context) error {
 
 	cfg.Manifest = m
 
-	h, err := util.Uint160DecodeStringLE(ctx.String("hash"))
+	h, err := util.Uint160DecodeStringLE(strings.TrimPrefix(ctx.String("hash"), "0x"))
 	if err != nil {
 		return cli.NewExitError(fmt.Errorf("invalid contract hash: %w", err), 1)
 	}

cli/smartcontract/generate_test.go

@@ -256,7 +256,7 @@ func TestGenerateValidPackageName(t *testing.T) {
 	require.NoError(t, app.Run([]string{"", "generate-wrapper",
 		"--manifest", manifestFile,
 		"--out", outFile,
-		"--hash", h.StringLE(),
+		"--hash", "0x" + h.StringLE(),
 	}))
 
 	data, err := ioutil.ReadFile(outFile)