feat(goctl): Support gateway sample generation (#3049)

tools/goctl/gateway/template.go

@@ -0,0 +1,62 @@
+package gateway
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/zeromicro/go-zero/tools/goctl/util/pathx"
+)
+
+const (
+	category                          = "gateway"
+	etcTemplateFileFile               = "etc.tpl"
+	mainTemplateFile                  = "main.tpl"
+)
+
+//go:embed conf.yml
+var etcTemplate string
+
+//go:embed gateway.tpl
+var mainTemplate string
+
+
+var templates = map[string]string{
+	etcTemplateFileFile:       etcTemplate,
+	mainTemplateFile:          mainTemplate,
+}
+
+// GenTemplates is the entry for command goctl template,
+// it will create the specified category
+func GenTemplates() error {
+	return pathx.InitTemplates(category, templates)
+}
+
+// RevertTemplate restores the deleted template files
+func RevertTemplate(name string) error {
+	content, ok := templates[name]
+	if !ok {
+		return fmt.Errorf("%s: no such file name", name)
+	}
+	return pathx.CreateTemplate(category, name, content)
+}
+
+// Clean deletes all template files
+func Clean() error {
+	return pathx.Clean(category)
+}
+
+// Update is used to update the template files, it will delete the existing old templates at first,
+// and then create the latest template files
+func Update() error {
+	err := Clean()
+	if err != nil {
+		return err
+	}
+
+	return pathx.InitTemplates(category, templates)
+}
+
+// Category returns a const string value for rpc template category
+func Category() string {
+	return category
+}