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|
// Mostly copied from Go's src/cmd/gofmt:
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"github.com/google/blueprint/parser"
)
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from bpfmt's")
overwriteSourceFile = flag.Bool("w", false, "write result to (source) file")
writeToStout = flag.Bool("o", false, "write result to stdout")
doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
sortLists = flag.Bool("s", false, "sort arrays")
)
var (
exitCode = 0
)
func report(err error) {
fmt.Fprintln(os.Stderr, err)
exitCode = 2
}
func usage() {
usageViolation("")
}
func usageViolation(violation string) {
fmt.Fprintln(os.Stderr, violation)
fmt.Fprintln(os.Stderr, "usage: bpfmt [flags] [path ...]")
flag.PrintDefaults()
os.Exit(2)
}
func processFile(filename string, out io.Writer) error {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
return processReader(filename, f, out)
}
func processReader(filename string, in io.Reader, out io.Writer) error {
src, err := ioutil.ReadAll(in)
if err != nil {
return err
}
r := bytes.NewBuffer(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))
}
if *sortLists {
parser.SortLists(file)
}
res, err := parser.Print(file)
if err != nil {
return err
}
if !bytes.Equal(src, res) {
// formatting has changed
if *list {
fmt.Fprintln(out, filename)
}
if *overwriteSourceFile {
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 bpfmt/%s\n", filename, filename)
out.Write(data)
}
}
if !*list && !*overwriteSourceFile && !*doDiff {
_, err = out.Write(res)
}
return err
}
func walkDir(path string) {
visitFile := func(path string, f os.FileInfo, err error) error {
if err == nil && f.Name() == "Blueprints" {
err = processFile(path, os.Stdout)
}
if err != nil {
report(err)
}
return nil
}
filepath.Walk(path, visitFile)
}
func main() {
flag.Parse()
if !*writeToStout && !*overwriteSourceFile && !*doDiff && !*list {
usageViolation("one of -d, -l, -o, or -w is required")
}
if flag.NArg() == 0 {
// file to parse is stdin
if *overwriteSourceFile {
fmt.Fprintln(os.Stderr, "error: cannot use -w with standard input")
exitCode = 2
return
}
if err := processReader("<standard input>", os.Stdin, os.Stdout); 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)
default:
if err := processFile(path, os.Stdout); err != nil {
report(err)
}
}
}
}
func diff(b1, b2 []byte) (data []byte, err error) {
f1, err := ioutil.TempFile("", "bpfmt")
if err != nil {
return
}
defer os.Remove(f1.Name())
defer f1.Close()
f2, err := ioutil.TempFile("", "bpfmt")
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
}
|
