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// Copyright 2017 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.
// This file provides a bpfix command-line library
// TODO(jeffrygaston) should this file be consolidated with bpfmt.go?
package cmd_lib
import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"github.com/google/blueprint/parser"
"android/soong/bpfix/bpfix"
)
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from bpfmt's")
write = flag.Bool("w", false, "write result to (source) file instead of stdout")
doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
)
var (
exitCode = 0
)
func report(err error) {
fmt.Fprintln(os.Stderr, err)
exitCode = 2
}
func openAndProcess(filename string, out io.Writer, fixRequest bpfix.FixRequest) error {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
return processFile(filename, f, out, fixRequest)
}
// If in == nil, the source is the contents of the file with the given filename.
func processFile(filename string, in io.Reader, out io.Writer, fixRequest bpfix.FixRequest) error {
// load the input file
src, err := ioutil.ReadAll(in)
if err != nil {
return err
}
r := bytes.NewBuffer(append([]byte(nil), src...))
file, errs := parser.Parse(filename, r, parser.NewScope(nil))
if len(errs) > 0 {
for _, err := range errs {
fmt.Fprintln(os.Stderr, err)
}
return fmt.Errorf("%d parsing errors", len(errs))
}
// compute and apply any requested fixes
fixer := bpfix.NewFixer(file)
file, err = fixer.Fix(fixRequest)
if err != nil {
return err
}
// output the results
res, err := parser.Print(file)
if err != nil {
return err
}
if !bytes.Equal(src, res) {
// contents have changed
if *list {
fmt.Fprintln(out, filename)
}
if *write {
err = ioutil.WriteFile(filename, res, 0644)
if err != nil {
return err
}
}
if *doDiff {
data, err := diff(src, res)
if err != nil {
return fmt.Errorf("computing diff: %s", err)
}
fmt.Printf("diff %s bpfix/%s\n", filename, filename)
out.Write(data)
}
}
if !*list && !*write && !*doDiff {
_, err = out.Write(res)
}
return err
}
func makeFileVisitor(fixRequest bpfix.FixRequest) func(string, os.FileInfo, error) error {
return func(path string, f os.FileInfo, err error) error {
if err == nil && (f.Name() == "Blueprints" || f.Name() == "Android.bp") {
err = openAndProcess(path, os.Stdout, fixRequest)
}
if err != nil {
report(err)
}
return nil
}
}
func walkDir(path string, fixRequest bpfix.FixRequest) {
filepath.Walk(path, makeFileVisitor(fixRequest))
}
func Run() {
flag.Parse()
fixRequest := bpfix.NewFixRequest().AddAll()
if flag.NArg() == 0 {
if *write {
fmt.Fprintln(os.Stderr, "error: cannot use -w with standard input")
exitCode = 2
return
}
if err := processFile("<standard input>", os.Stdin, os.Stdout, fixRequest); err != nil {
report(err)
}
return
}
for i := 0; i < flag.NArg(); i++ {
path := flag.Arg(i)
switch dir, err := os.Stat(path); {
case err != nil:
report(err)
case dir.IsDir():
walkDir(path, fixRequest)
default:
if err := openAndProcess(path, os.Stdout, fixRequest); err != nil {
report(err)
}
}
}
}
func diff(b1, b2 []byte) (data []byte, err error) {
f1, err := ioutil.TempFile("", "bpfix")
if err != nil {
return
}
defer os.Remove(f1.Name())
defer f1.Close()
f2, err := ioutil.TempFile("", "bpfix")
if err != nil {
return
}
defer os.Remove(f2.Name())
defer f2.Close()
f1.Write(b1)
f2.Write(b2)
data, err = exec.Command("diff", "-u", f1.Name(), f2.Name()).CombinedOutput()
if len(data) > 0 {
// diff exits with a non-zero status when the files don't match.
// Ignore that failure as long as we get output.
err = nil
}
return
}
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