/
goreturns.go
264 lines (227 loc) · 5.28 KB
/
goreturns.go
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// Copyright 2013 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"
_ "go/importer"
"go/scanner"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"github.com/klauspost/asmfmt"
"golang.org/x/tools/imports"
"sourcegraph.com/sqs/goreturns/returns"
)
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from goreturns'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")
goimports = flag.Bool("i", true, "run goimports on the file prior to processing")
options = &returns.Options{}
exitCode = 0
)
func init() {
flag.BoolVar(&options.PrintErrors, "p", false, "print non-fatal typechecking errors to stderr")
flag.BoolVar(&options.AllErrors, "e", false, "report all errors (not just the first 10 on different lines)")
}
func report(err error) {
scanner.PrintError(os.Stderr, err)
exitCode = 2
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: goreturns [flags] [path ...]\n")
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, "(this version includes asmfmt)\n")
os.Exit(2)
}
func isGoFile(f os.FileInfo) bool {
// ignore non-Go files
name := f.Name()
return !f.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")
}
func isAsmFile(f os.FileInfo) bool {
// ignore non-Asm files
name := f.Name()
return !f.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".s")
}
func processGoFile(pkgDir, filename string, in io.Reader, out io.Writer, stdin bool) error {
opt := options
if stdin {
nopt := *options
nopt.Fragment = true
opt = &nopt
}
if in == nil {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
in = f
}
src, err := ioutil.ReadAll(in)
if err != nil {
return err
}
var res = src // This holds the result of processing so far.
if *goimports {
var err error
res, err = imports.Process(filename, res, &imports.Options{
Fragment: opt.Fragment,
AllErrors: opt.AllErrors,
Comments: true,
TabIndent: true,
TabWidth: 8,
})
if err != nil {
return err
}
}
res, err = returns.Process(pkgDir, filename, res, opt)
if err != nil {
return err
}
if !bytes.Equal(src, res) {
// formatting has changed
if *list {
fmt.Fprintln(out, filename)
}
if *write {
err = ioutil.WriteFile(filename, res, 0)
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 gofmt/%s\n", filename, filename)
out.Write(data)
}
}
if !*list && !*write && !*doDiff {
_, err = out.Write(res)
}
return err
}
// If in == nil, the source is the contents of the file with the given filename.
func processAsmFile(filename string, in io.Reader, out io.Writer, stdin bool) error {
if in == nil {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
in = f
}
src, err := ioutil.ReadAll(in)
if err != nil {
return err
}
res, err := asmfmt.Format(bytes.NewBuffer(src))
if err != nil {
return err
}
if !bytes.Equal(src, res) {
// formatting has 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 asmfmt/%s\n", filename, filename)
out.Write(data)
}
}
if !*list && !*write && !*doDiff {
_, err = out.Write(res)
}
return err
}
func visitFile(path string, f os.FileInfo, err error) error {
if err == nil && isGoFile(f) {
err = processGoFile(filepath.Dir(path), path, nil, os.Stdout, false)
} else if err == nil && isAsmFile(f) {
err = processAsmFile(path, nil, os.Stdout, false)
}
if err != nil {
report(err)
}
return nil
}
func walkDir(path string) {
filepath.Walk(path, visitFile)
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
// call gofmtMain in a separate function
// so that it can use defer and have them
// run before the exit.
gofmtMain()
os.Exit(exitCode)
}
func gofmtMain() {
flag.Usage = usage
flag.Parse()
if flag.NArg() == 0 {
if err := processGoFile("", "<standard input>", os.Stdin, os.Stdout, true); 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 := visitFile(path, dir, nil); err != nil {
report(err)
}
}
}
}
func diff(b1, b2 []byte) (data []byte, err error) {
f1, err := ioutil.TempFile("", "gofmt")
if err != nil {
return
}
defer os.Remove(f1.Name())
defer f1.Close()
f2, err := ioutil.TempFile("", "gofmt")
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
}