// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"archive/zip"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"sort"
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"strings"
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)
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var (
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outputFile = flag.String("o", "", "output file")
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prefix = flag.String("prefix", "", "prefix for each entry in the output file")
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inputFile = flag.String("i", "", "input jar or srcjar")
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)
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func must(err error) {
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if err != nil {
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log.Fatal(err)
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}
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}
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func fileToPackage(file string) string {
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dir := filepath.Dir(file)
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return strings.Replace(dir, "/", ".", -1)
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}
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func main() {
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flag.Usage = func() {
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fmt.Fprintln(os.Stderr, "usage: extract_jar_packages -i <input file> -o <output -file> [-prefix <prefix>]")
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flag.PrintDefaults()
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}
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flag.Parse()
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if *outputFile == "" || *inputFile == "" {
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flag.Usage()
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os.Exit(1)
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}
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pkgSet := make(map[string]bool)
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reader, err := zip.OpenReader(*inputFile)
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if err != nil {
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log.Fatal(err)
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}
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defer reader.Close()
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for _, f := range reader.File {
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ext := filepath.Ext(f.Name)
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if ext == ".java" || ext == ".class" {
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pkgSet[fileToPackage(f.Name)] = true
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}
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}
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var pkgs []string
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for k := range pkgSet {
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pkgs = append(pkgs, k)
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}
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sort.Strings(pkgs)
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var data []byte
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for _, pkg := range pkgs {
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data = append(data, *prefix...)
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data = append(data, pkg...)
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data = append(data, "\n"...)
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}
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must(ioutil.WriteFile(*outputFile, data, 0666))
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}
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