feat: Add migrate (#1419)

* Add migrate

* Remove unused module

* refactor filename

* rename refactor to migrate

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/migrate/proxy.go

@@ -0,0 +1,42 @@
+package migrate
+
+import (
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/tal-tech/go-zero/core/stringx"
+	"github.com/tal-tech/go-zero/tools/goctl/rpc/execx"
+)
+
+var defaultProxy = "https://goproxy.cn"
+var defaultProxies = []string{defaultProxy}
+
+func goProxy() []string {
+	wd, err := os.Getwd()
+	if err != nil {
+		return defaultProxies
+	}
+
+	proxy, err := execx.Run("go env GOPROXY", wd)
+	if err != nil {
+		return defaultProxies
+	}
+	list := strings.FieldsFunc(proxy, func(r rune) bool {
+		return r == '|' || r == ','
+	})
+	var ret []string
+	for _, item := range list {
+		if len(item) == 0 {
+			continue
+		}
+		_, err = url.Parse(item)
+		if err == nil && !stringx.Contains(ret, item) {
+			ret = append(ret, item)
+		}
+	}
+	if !stringx.Contains(ret, defaultProxy) {
+		ret = append(ret, defaultProxy)
+	}
+	return ret
+}