github.com/westcoastroms/westcoastroms-build@v0.0.0-20190928114312-2350e5a73030/build/soong/cmd/extract_jar_packages/extract_jar_packages.go (about)

     1  // Copyright 2018 Google Inc. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"archive/zip"
    19  	"flag"
    20  	"fmt"
    21  	"io/ioutil"
    22  	"log"
    23  	"os"
    24  	"path/filepath"
    25  	"sort"
    26  	"strings"
    27  )
    28  
    29  var (
    30  	outputFile = flag.String("o", "", "output file")
    31  	prefix     = flag.String("prefix", "", "prefix for each entry in the output file")
    32  	inputFile  = flag.String("i", "", "input jar or srcjar")
    33  )
    34  
    35  func must(err error) {
    36  	if err != nil {
    37  		log.Fatal(err)
    38  	}
    39  }
    40  
    41  func fileToPackage(file string) string {
    42  	dir := filepath.Dir(file)
    43  	return strings.Replace(dir, "/", ".", -1)
    44  }
    45  
    46  func main() {
    47  	flag.Usage = func() {
    48  		fmt.Fprintln(os.Stderr, "usage: extract_jar_packages -i <input file> -o <output -file> [-prefix <prefix>]")
    49  		flag.PrintDefaults()
    50  	}
    51  
    52  	flag.Parse()
    53  
    54  	if *outputFile == "" || *inputFile == "" {
    55  		flag.Usage()
    56  		os.Exit(1)
    57  	}
    58  
    59  	pkgSet := make(map[string]bool)
    60  
    61  	reader, err := zip.OpenReader(*inputFile)
    62  	if err != nil {
    63  		log.Fatal(err)
    64  	}
    65  	defer reader.Close()
    66  
    67  	for _, f := range reader.File {
    68  		ext := filepath.Ext(f.Name)
    69  		if ext == ".java" || ext == ".class" {
    70  			pkgSet[fileToPackage(f.Name)] = true
    71  		}
    72  	}
    73  
    74  	var pkgs []string
    75  	for k := range pkgSet {
    76  		pkgs = append(pkgs, k)
    77  	}
    78  	sort.Strings(pkgs)
    79  
    80  	var data []byte
    81  	for _, pkg := range pkgs {
    82  		data = append(data, *prefix...)
    83  		data = append(data, pkg...)
    84  		data = append(data, "\n"...)
    85  	}
    86  
    87  	must(ioutil.WriteFile(*outputFile, data, 0666))
    88  }