adding gres package for resource feature

os/gres/gres.go

@@ -0,0 +1,68 @@
+// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gres
+
+import (
+	"archive/zip"
+	"bytes"
+	"fmt"
+	"github.com/gogf/gf/container/gtree"
+	"github.com/gogf/gf/encoding/gcompress"
+	"github.com/gogf/gf/internal/utilbytes"
+	"github.com/gogf/gf/os/gfile"
+	"strings"
+)
+
+type Resource struct {
+	Name string
+}
+
+var (
+	resTree = gtree.NewBTree(10, func(v1, v2 interface{}) int {
+		return strings.Compare(v1.(string), v2.(string))
+	})
+)
+
+func Add(content []byte) error {
+	reader, err := zip.NewReader(bytes.NewReader(content), int64(len(content)))
+	if err != nil {
+		return err
+	}
+	for _, file := range reader.File {
+		resTree.Set(file.Name, file)
+	}
+	return nil
+}
+
+func Dump() {
+	resTree.Iterator(func(key, value interface{}) bool {
+		fmt.Printf("%7s %s\n", gfile.FormatSize(value.(*zip.File).FileInfo().Size()), key)
+		return true
+	})
+}
+
+func Export(srcPath, goFilePath, pkgName string, keyPrefix ...string) error {
+	buffer := bytes.NewBuffer(nil)
+	err := gcompress.ZipPathWriter(srcPath, buffer, keyPrefix...)
+	if err != nil {
+		return err
+	}
+	return gfile.PutContents(
+		goFilePath,
+		fmt.Sprintf(
+			`package %s
+
+import "github.com/gogf/gf/os/gres"
+
+func init() {
+	if err := gres.Add(%s); err != nil {
+		panic(err)
+	}
+}
+`, pkgName, utilbytes.Export(buffer.Bytes())),
+	)
+}