1 files changed, 380 insertions, 0 deletions
diff --git a/vendor/golang.org/x/tools/cmd/goimports/goimports.go b/vendor/golang.org/x/tools/cmd/goimports/goimports.go
new file mode 100644
index 000000000..b354c9e82
--- /dev/null
+++ b/vendor/golang.org/x/tools/cmd/goimports/goimports.go
@@ -0,0 +1,380 @@
+// 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 (
+	"bufio"
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"go/scanner"
+	exec "golang.org/x/sys/execabs"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"strings"
+
+	"golang.org/x/tools/internal/gocommand"
+	"golang.org/x/tools/internal/imports"
+)
+
+var (
+	// main operation modes
+	list   = flag.Bool("l", false, "list files whose formatting differs from goimport'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")
+	srcdir = flag.String("srcdir", "", "choose imports as if source code is from `dir`. When operating on a single file, dir may instead be the complete file name.")
+
+	verbose bool // verbose logging
+
+	cpuProfile     = flag.String("cpuprofile", "", "CPU profile output")
+	memProfile     = flag.String("memprofile", "", "memory profile output")
+	memProfileRate = flag.Int("memrate", 0, "if > 0, sets runtime.MemProfileRate")
+
+	options = &imports.Options{
+		TabWidth:  8,
+		TabIndent: true,
+		Comments:  true,
+		Fragment:  true,
+		Env: &imports.ProcessEnv{
+			GocmdRunner: &gocommand.Runner{},
+		},
+	}
+	exitCode = 0
+)
+
+func init() {
+	flag.BoolVar(&options.AllErrors, "e", false, "report all errors (not just the first 10 on different lines)")
+	flag.StringVar(&options.LocalPrefix, "local", "", "put imports beginning with this string after 3rd-party packages; comma-separated list")
+	flag.BoolVar(&options.FormatOnly, "format-only", false, "if true, don't fix imports and only format. In this mode, goimports is effectively gofmt, with the addition that imports are grouped into sections.")
+}
+
+func report(err error) {
+	scanner.PrintError(os.Stderr, err)
+	exitCode = 2
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: goimports [flags] [path ...]\n")
+	flag.PrintDefaults()
+	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")
+}
+
+// argumentType is which mode goimports was invoked as.
+type argumentType int
+
+const (
+	// fromStdin means the user is piping their source into goimports.
+	fromStdin argumentType = iota
+
+	// singleArg is the common case from editors, when goimports is run on
+	// a single file.
+	singleArg
+
+	// multipleArg is when the user ran "goimports file1.go file2.go"
+	// or ran goimports on a directory tree.
+	multipleArg
+)
+
+func processFile(filename string, in io.Reader, out io.Writer, argType argumentType) error {
+	opt := options
+	if argType == fromStdin {
+		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
+	}
+
+	target := filename
+	if *srcdir != "" {
+		// Determine whether the provided -srcdirc is a directory or file
+		// and then use it to override the target.
+		//
+		// See https://github.com/dominikh/go-mode.el/issues/146
+		if isFile(*srcdir) {
+			if argType == multipleArg {
+				return errors.New("-srcdir value can't be a file when passing multiple arguments or when walking directories")
+			}
+			target = *srcdir
+		} else if argType == singleArg && strings.HasSuffix(*srcdir, ".go") && !isDir(*srcdir) {
+			// For a file which doesn't exist on disk yet, but might shortly.
+			// e.g. user in editor opens $DIR/newfile.go and newfile.go doesn't yet exist on disk.
+			// The goimports on-save hook writes the buffer to a temp file
+			// first and runs goimports before the actual save to newfile.go.
+			// The editor's buffer is named "newfile.go" so that is passed to goimports as:
+			//      goimports -srcdir=/gopath/src/pkg/newfile.go /tmp/gofmtXXXXXXXX.go
+			// and then the editor reloads the result from the tmp file and writes
+			// it to newfile.go.
+			target = *srcdir
+		} else {
+			// Pretend that file is from *srcdir in order to decide
+			// visible imports correctly.
+			target = filepath.Join(*srcdir, filepath.Base(filename))
+		}
+	}
+
+	res, err := imports.Process(target, src, opt)
+	if err != nil {
+		return err
+	}
+
+	if !bytes.Equal(src, res) {
+		// formatting has changed
+		if *list {
+			fmt.Fprintln(out, filename)
+		}
+		if *write {
+			if argType == fromStdin {
+				// filename is "<standard input>"
+				return errors.New("can't use -w on stdin")
+			}
+			// On Windows, we need to re-set the permissions from the file. See golang/go#38225.
+			var perms os.FileMode
+			if fi, err := os.Stat(filename); err == nil {
+				perms = fi.Mode() & os.ModePerm
+			}
+			err = ioutil.WriteFile(filename, res, perms)
+			if err != nil {
+				return err
+			}
+		}
+		if *doDiff {
+			if argType == fromStdin {
+				filename = "stdin.go" // because <standard input>.orig looks silly
+			}
+			data, err := diff(src, res, filename)
+			if err != nil {
+				return fmt.Errorf("computing diff: %s", err)
+			}
+			fmt.Printf("diff -u %s %s\n", filepath.ToSlash(filename+".orig"), filepath.ToSlash(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 = processFile(path, nil, os.Stdout, multipleArg)
+	}
+	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)
+}
+
+// parseFlags parses command line flags and returns the paths to process.
+// It's a var so that custom implementations can replace it in other files.
+var parseFlags = func() []string {
+	flag.BoolVar(&verbose, "v", false, "verbose logging")
+
+	flag.Parse()
+	return flag.Args()
+}
+
+func bufferedFileWriter(dest string) (w io.Writer, close func()) {
+	f, err := os.Create(dest)
+	if err != nil {
+		log.Fatal(err)
+	}
+	bw := bufio.NewWriter(f)
+	return bw, func() {
+		if err := bw.Flush(); err != nil {
+			log.Fatalf("error flushing %v: %v", dest, err)
+		}
+		if err := f.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}
+}
+
+func gofmtMain() {
+	flag.Usage = usage
+	paths := parseFlags()
+
+	if *cpuProfile != "" {
+		bw, flush := bufferedFileWriter(*cpuProfile)
+		pprof.StartCPUProfile(bw)
+		defer flush()
+		defer pprof.StopCPUProfile()
+	}
+	// doTrace is a conditionally compiled wrapper around runtime/trace. It is
+	// used to allow goimports to compile under gccgo, which does not support
+	// runtime/trace. See https://golang.org/issue/15544.
+	defer doTrace()()
+	if *memProfileRate > 0 {
+		runtime.MemProfileRate = *memProfileRate
+		bw, flush := bufferedFileWriter(*memProfile)
+		defer func() {
+			runtime.GC() // materialize all statistics
+			if err := pprof.WriteHeapProfile(bw); err != nil {
+				log.Fatal(err)
+			}
+			flush()
+		}()
+	}
+
+	if verbose {
+		log.SetFlags(log.LstdFlags | log.Lmicroseconds)
+		options.Env.Logf = log.Printf
+	}
+	if options.TabWidth < 0 {
+		fmt.Fprintf(os.Stderr, "negative tabwidth %d\n", options.TabWidth)
+		exitCode = 2
+		return
+	}
+
+	if len(paths) == 0 {
+		if err := processFile("<standard input>", os.Stdin, os.Stdout, fromStdin); err != nil {
+			report(err)
+		}
+		return
+	}
+
+	argType := singleArg
+	if len(paths) > 1 {
+		argType = multipleArg
+	}
+
+	for _, path := range paths {
+		switch dir, err := os.Stat(path); {
+		case err != nil:
+			report(err)
+		case dir.IsDir():
+			walkDir(path)
+		default:
+			if err := processFile(path, nil, os.Stdout, argType); err != nil {
+				report(err)
+			}
+		}
+	}
+}
+
+func writeTempFile(dir, prefix string, data []byte) (string, error) {
+	file, err := ioutil.TempFile(dir, prefix)
+	if err != nil {
+		return "", err
+	}
+	_, err = file.Write(data)
+	if err1 := file.Close(); err == nil {
+		err = err1
+	}
+	if err != nil {
+		os.Remove(file.Name())
+		return "", err
+	}
+	return file.Name(), nil
+}
+
+func diff(b1, b2 []byte, filename string) (data []byte, err error) {
+	f1, err := writeTempFile("", "gofmt", b1)
+	if err != nil {
+		return
+	}
+	defer os.Remove(f1)
+
+	f2, err := writeTempFile("", "gofmt", b2)
+	if err != nil {
+		return
+	}
+	defer os.Remove(f2)
+
+	cmd := "diff"
+	if runtime.GOOS == "plan9" {
+		cmd = "/bin/ape/diff"
+	}
+
+	data, err = exec.Command(cmd, "-u", f1, f2).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.
+		return replaceTempFilename(data, filename)
+	}
+	return
+}
+
+// replaceTempFilename replaces temporary filenames in diff with actual one.
+//
+// --- /tmp/gofmt316145376	2017-02-03 19:13:00.280468375 -0500
+// +++ /tmp/gofmt617882815	2017-02-03 19:13:00.280468375 -0500
+// ...
+// ->
+// --- path/to/file.go.orig	2017-02-03 19:13:00.280468375 -0500
+// +++ path/to/file.go	2017-02-03 19:13:00.280468375 -0500
+// ...
+func replaceTempFilename(diff []byte, filename string) ([]byte, error) {
+	bs := bytes.SplitN(diff, []byte{'\n'}, 3)
+	if len(bs) < 3 {
+		return nil, fmt.Errorf("got unexpected diff for %s", filename)
+	}
+	// Preserve timestamps.
+	var t0, t1 []byte
+	if i := bytes.LastIndexByte(bs[0], '\t'); i != -1 {
+		t0 = bs[0][i:]
+	}
+	if i := bytes.LastIndexByte(bs[1], '\t'); i != -1 {
+		t1 = bs[1][i:]
+	}
+	// Always print filepath with slash separator.
+	f := filepath.ToSlash(filename)
+	bs[0] = []byte(fmt.Sprintf("--- %s%s", f+".orig", t0))
+	bs[1] = []byte(fmt.Sprintf("+++ %s%s", f, t1))
+	return bytes.Join(bs, []byte{'\n'}), nil
+}
+
+// isFile reports whether name is a file.
+func isFile(name string) bool {
+	fi, err := os.Stat(name)
+	return err == nil && fi.Mode().IsRegular()
+}
+
+// isDir reports whether name is a directory.
+func isDir(name string) bool {
+	fi, err := os.Stat(name)
+	return err == nil && fi.IsDir()
+}