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