forked from bradfitz/goimports
/
replaceimports.go
218 lines (176 loc) · 4.19 KB
/
replaceimports.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 (
"./internal/utils"
"bytes"
"flag"
"fmt"
"go/parser"
"go/scanner"
"go/token"
"io"
"io/ioutil"
"os"
"runtime"
"strconv"
"strings"
"golang.org/x/tools/go/ast/astutil"
)
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from replaceimports'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")
importPath1 = flag.String("f", "", "import path to find")
importPath2 = flag.String("r", "", "import path to replace with")
exitCode = 0
)
func init() {
}
func report(err error) {
scanner.PrintError(os.Stderr, err)
exitCode = 2
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: replaceimports [flags] [path ...]\n")
flag.PrintDefaults()
os.Exit(2)
}
func processFile(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 := processFindAndReplace(filename, 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, 0)
if err != nil {
return err
}
}
if *doDiff {
data, e := utils.Diff(src, res)
if e != nil {
return fmt.Errorf("computing diff: %s", e)
}
fmt.Printf("diff %s gofmt/%s\n", filename, filename)
out.Write(data)
}
}
if !*list && !*write && !*doDiff {
_, err = out.Write(res)
}
return err
}
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 := processFile("<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 := processFile(path, nil, os.Stdout, false); err != nil {
report(err)
}
}
}
}
func walkDir(path string) {
utils.ForEachGoFilesInDir(path, func(filePath string, err error) {
if err == nil {
err = processFile(filePath, nil, os.Stdout, false)
}
if err != nil {
report(err)
}
})
}
func processFindAndReplace(filename string, src []byte) ([]byte, error) {
return processFileImpl(filename, src, func(path1 string) string {
if path1 == *importPath1 {
return *importPath2
} else if strings.HasPrefix(path1, *importPath1+"/") {
return *importPath2 + path1[len(*importPath1):]
}
return ""
})
}
func processFileImpl(filename string, src []byte, f func(string) string) ([]byte, error) {
//fmt.Printf("Process %v %v bytes \n", filename, len(src))
fileSet := token.NewFileSet()
parserMode := parser.Mode(0)
parserMode |= parser.ParseComments
file, err := parser.ParseFile(fileSet, filename, src, parserMode)
if err != nil {
return nil, err
}
imps := astutil.Imports(fileSet, file)
type Found struct {
offset1, offset2 int
path2 []byte
}
founds := make([]Found, 0, 16)
for _, impSection := range imps {
for _, importSpec := range impSection {
path, _ := strconv.Unquote(importSpec.Path.Value)
path2 := f(path)
if path2 == "" {
continue
}
p1 := fileSet.Position(importSpec.Path.Pos())
p2 := fileSet.Position(importSpec.Path.End())
f := Found{offset1: p1.Offset, offset2: p2.Offset, path2: ([]byte)(fmt.Sprintf("\"%v\"", path2))}
founds = append(founds, f)
}
}
if len(founds) > 0 {
buf := &bytes.Buffer{}
index := 0
for _, f := range founds {
if index < f.offset1 {
buf.Write(src[index:f.offset1])
}
buf.Write(f.path2)
index = f.offset2
}
buf.Write(src[index:])
return buf.Bytes(), nil
}
return src, nil
}