go.mod: vendor golangci-lint

10 files changed, 1566 insertions, 0 deletions

diff --git a/vendor/github.com/golangci/gofmt/gofmt/LICENSE b/vendor/github.com/golangci/gofmt/gofmt/LICENSE
new file mode 100644
index 000000000..6a66aea5e
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/golangci/gofmt/gofmt/doc.go b/vendor/github.com/golangci/gofmt/gofmt/doc.go
new file mode 100644
index 000000000..da0c8581d
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/doc.go
@@ -0,0 +1,104 @@
+// 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.
+
+/*
+Gofmt formats Go programs.
+It uses tabs for indentation and blanks for alignment.
+Alignment assumes that an editor is using a fixed-width font.
+
+Without an explicit path, it processes the standard input.  Given a file,
+it operates on that file; given a directory, it operates on all .go files in
+that directory, recursively.  (Files starting with a period are ignored.)
+By default, gofmt prints the reformatted sources to standard output.
+
+Usage:
+	gofmt [flags] [path ...]
+
+The flags are:
+	-d
+		Do not print reformatted sources to standard output.
+		If a file's formatting is different than gofmt's, print diffs
+		to standard output.
+	-e
+		Print all (including spurious) errors.
+	-l
+		Do not print reformatted sources to standard output.
+		If a file's formatting is different from gofmt's, print its name
+		to standard output.
+	-r rule
+		Apply the rewrite rule to the source before reformatting.
+	-s
+		Try to simplify code (after applying the rewrite rule, if any).
+	-w
+		Do not print reformatted sources to standard output.
+		If a file's formatting is different from gofmt's, overwrite it
+		with gofmt's version. If an error occurred during overwriting,
+		the original file is restored from an automatic backup.
+
+Debugging support:
+	-cpuprofile filename
+		Write cpu profile to the specified file.
+
+
+The rewrite rule specified with the -r flag must be a string of the form:
+
+	pattern -> replacement
+
+Both pattern and replacement must be valid Go expressions.
+In the pattern, single-character lowercase identifiers serve as
+wildcards matching arbitrary sub-expressions; those expressions
+will be substituted for the same identifiers in the replacement.
+
+When gofmt reads from standard input, it accepts either a full Go program
+or a program fragment.  A program fragment must be a syntactically
+valid declaration list, statement list, or expression.  When formatting
+such a fragment, gofmt preserves leading indentation as well as leading
+and trailing spaces, so that individual sections of a Go program can be
+formatted by piping them through gofmt.
+
+Examples
+
+To check files for unnecessary parentheses:
+
+	gofmt -r '(a) -> a' -l *.go
+
+To remove the parentheses:
+
+	gofmt -r '(a) -> a' -w *.go
+
+To convert the package tree from explicit slice upper bounds to implicit ones:
+
+	gofmt -r 'α[β:len(α)] -> α[β:]' -w $GOROOT/src
+
+The simplify command
+
+When invoked with -s gofmt will make the following source transformations where possible.
+
+	An array, slice, or map composite literal of the form:
+		[]T{T{}, T{}}
+	will be simplified to:
+		[]T{{}, {}}
+
+	A slice expression of the form:
+		s[a:len(s)]
+	will be simplified to:
+		s[a:]
+
+	A range of the form:
+		for x, _ = range v {...}
+	will be simplified to:
+		for x = range v {...}
+
+	A range of the form:
+		for _ = range v {...}
+	will be simplified to:
+		for range v {...}
+
+This may result in changes that are incompatible with earlier versions of Go.
+*/
+package gofmt
+
+// BUG(rsc): The implementation of -r is a bit slow.
+// BUG(gri): If -w fails, the restored original file may not have some of the
+// original file attributes.
diff --git a/vendor/github.com/golangci/gofmt/gofmt/gofmt.go b/vendor/github.com/golangci/gofmt/gofmt/gofmt.go
new file mode 100644
index 000000000..fb9c8cb37
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/gofmt.go
@@ -0,0 +1,327 @@
+// 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 gofmt
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/printer"
+	"go/scanner"
+	"go/token"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"strings"
+	"sync"
+)
+
+var (
+	// main operation modes
+	list        = flag.Bool("gofmt.l", false, "list files whose formatting differs from gofmt's")
+	write       = flag.Bool("gofmt.w", false, "write result to (source) file instead of stdout")
+	rewriteRule = flag.String("gofmt.r", "", "rewrite rule (e.g., 'a[b:len(a)] -> a[b:]')")
+	simplifyAST = flag.Bool("gofmt.s", false, "simplify code")
+	doDiff      = flag.Bool("gofmt.d", false, "display diffs instead of rewriting files")
+	allErrors   = flag.Bool("gofmt.e", false, "report all errors (not just the first 10 on different lines)")
+
+	// debugging
+	cpuprofile = flag.String("gofmt.cpuprofile", "", "write cpu profile to this file")
+)
+
+const (
+	tabWidth    = 8
+	printerMode = printer.UseSpaces | printer.TabIndent
+)
+
+var (
+	fileSet            = token.NewFileSet() // per process FileSet
+	exitCode           = 0
+	rewrite            func(*ast.File) *ast.File
+	parserMode         parser.Mode
+	parserModeInitOnce sync.Once
+)
+
+func report(err error) {
+	scanner.PrintError(os.Stderr, err)
+	exitCode = 2
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: gofmt [flags] [path ...]\n")
+	flag.PrintDefaults()
+}
+
+func initParserMode() {
+	parserModeInitOnce.Do(func() {
+		parserMode = parser.ParseComments
+		if *allErrors {
+			parserMode |= parser.AllErrors
+		}
+	})
+}
+
+func isGoFile(f os.FileInfo) bool {
+	// ignore non-Go files
+	name := f.Name()
+	return !f.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")
+}
+
+// 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, stdin bool) error {
+	var perm os.FileMode = 0644
+	if in == nil {
+		f, err := os.Open(filename)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		fi, err := f.Stat()
+		if err != nil {
+			return err
+		}
+		in = f
+		perm = fi.Mode().Perm()
+	}
+
+	src, err := ioutil.ReadAll(in)
+	if err != nil {
+		return err
+	}
+
+	file, sourceAdj, indentAdj, err := parse(fileSet, filename, src, stdin)
+	if err != nil {
+		return err
+	}
+
+	if rewrite != nil {
+		if sourceAdj == nil {
+			file = rewrite(file)
+		} else {
+			fmt.Fprintf(os.Stderr, "warning: rewrite ignored for incomplete programs\n")
+		}
+	}
+
+	ast.SortImports(fileSet, file)
+
+	if *simplifyAST {
+		simplify(file)
+	}
+
+	res, err := format(fileSet, file, sourceAdj, indentAdj, src, printer.Config{Mode: printerMode, Tabwidth: tabWidth})
+	if err != nil {
+		return err
+	}
+
+	if !bytes.Equal(src, res) {
+		// formatting has changed
+		if *list {
+			fmt.Fprintln(out, filename)
+		}
+		if *write {
+			// make a temporary backup before overwriting original
+			bakname, err := backupFile(filename+".", src, perm)
+			if err != nil {
+				return err
+			}
+			err = ioutil.WriteFile(filename, res, perm)
+			if err != nil {
+				os.Rename(bakname, filename)
+				return err
+			}
+			err = os.Remove(bakname)
+			if err != nil {
+				return err
+			}
+		}
+		if *doDiff {
+			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, false)
+	}
+	// Don't complain if a file was deleted in the meantime (i.e.
+	// the directory changed concurrently while running gofmt).
+	if err != nil && !os.IsNotExist(err) {
+		report(err)
+	}
+	return nil
+}
+
+func walkDir(path string) {
+	filepath.Walk(path, visitFile)
+}
+
+func gofmtMain() {
+	flag.Usage = usage
+	flag.Parse()
+
+	if *cpuprofile != "" {
+		f, err := os.Create(*cpuprofile)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "creating cpu profile: %s\n", err)
+			exitCode = 2
+			return
+		}
+		defer f.Close()
+		pprof.StartCPUProfile(f)
+		defer pprof.StopCPUProfile()
+	}
+
+	initParserMode()
+	initRewrite()
+
+	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, 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 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
+}
+
+const chmodSupported = runtime.GOOS != "windows"
+
+// backupFile writes data to a new file named filename<number> with permissions perm,
+// with <number randomly chosen such that the file name is unique. backupFile returns
+// the chosen file name.
+func backupFile(filename string, data []byte, perm os.FileMode) (string, error) {
+	// create backup file
+	f, err := ioutil.TempFile(filepath.Dir(filename), filepath.Base(filename))
+	if err != nil {
+		return "", err
+	}
+	bakname := f.Name()
+	if chmodSupported {
+		err = f.Chmod(perm)
+		if err != nil {
+			f.Close()
+			os.Remove(bakname)
+			return bakname, err
+		}
+	}
+
+	// write data to backup file
+	n, err := f.Write(data)
+	if err == nil && n < len(data) {
+		err = io.ErrShortWrite
+	}
+	if err1 := f.Close(); err == nil {
+		err = err1
+	}
+
+	return bakname, err
+}
diff --git a/vendor/github.com/golangci/gofmt/gofmt/golangci.go b/vendor/github.com/golangci/gofmt/gofmt/golangci.go
new file mode 100644
index 000000000..0f5a0d408
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/golangci.go
@@ -0,0 +1,46 @@
+package gofmt
+
+import (
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/printer"
+	"io/ioutil"
+)
+
+func Run(filename string, needSimplify bool) ([]byte, error) {
+	src, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	initParserMode()
+
+	file, sourceAdj, indentAdj, err := parse(fileSet, filename, src, false)
+	if err != nil {
+		return nil, err
+	}
+
+	ast.SortImports(fileSet, file)
+
+	if needSimplify {
+		simplify(file)
+	}
+
+	res, err := format(fileSet, file, sourceAdj, indentAdj, src, printer.Config{Mode: printerMode, Tabwidth: tabWidth})
+	if err != nil {
+		return nil, err
+	}
+
+	if bytes.Equal(src, res) {
+		return nil, nil
+	}
+
+	// formatting has changed
+	data, err := diff(src, res, filename)
+	if err != nil {
+		return nil, fmt.Errorf("error computing diff: %s", err)
+	}
+
+	return data, nil
+}
diff --git a/vendor/github.com/golangci/gofmt/gofmt/internal.go b/vendor/github.com/golangci/gofmt/gofmt/internal.go
new file mode 100644
index 000000000..8b76d39d5
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/internal.go
@@ -0,0 +1,176 @@
+// Copyright 2015 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.
+
+// TODO(gri): This file and the file src/go/format/internal.go are
+// the same (but for this comment and the package name). Do not modify
+// one without the other. Determine if we can factor out functionality
+// in a public API. See also #11844 for context.
+
+package gofmt
+
+import (
+	"bytes"
+	"go/ast"
+	"go/parser"
+	"go/printer"
+	"go/token"
+	"strings"
+)
+
+// parse parses src, which was read from the named file,
+// as a Go source file, declaration, or statement list.
+func parse(fset *token.FileSet, filename string, src []byte, fragmentOk bool) (
+	file *ast.File,
+	sourceAdj func(src []byte, indent int) []byte,
+	indentAdj int,
+	err error,
+) {
+	// Try as whole source file.
+	file, err = parser.ParseFile(fset, filename, src, parserMode)
+	// If there's no error, return. If the error is that the source file didn't begin with a
+	// package line and source fragments are ok, fall through to
+	// try as a source fragment. Stop and return on any other error.
+	if err == nil || !fragmentOk || !strings.Contains(err.Error(), "expected 'package'") {
+		return
+	}
+
+	// If this is a declaration list, make it a source file
+	// by inserting a package clause.
+	// Insert using a ;, not a newline, so that the line numbers
+	// in psrc match the ones in src.
+	psrc := append([]byte("package p;"), src...)
+	file, err = parser.ParseFile(fset, filename, psrc, parserMode)
+	if err == nil {
+		sourceAdj = func(src []byte, indent int) []byte {
+			// Remove the package clause.
+			// Gofmt has turned the ; into a \n.
+			src = src[indent+len("package p\n"):]
+			return bytes.TrimSpace(src)
+		}
+		return
+	}
+	// If the error is that the source file didn't begin with a
+	// declaration, fall through to try as a statement list.
+	// Stop and return on any other error.
+	if !strings.Contains(err.Error(), "expected declaration") {
+		return
+	}
+
+	// If this is a statement list, make it a source file
+	// by inserting a package clause and turning the list
+	// into a function body. This handles expressions too.
+	// Insert using a ;, not a newline, so that the line numbers
+	// in fsrc match the ones in src. Add an extra '\n' before the '}'
+	// to make sure comments are flushed before the '}'.
+	fsrc := append(append([]byte("package p; func _() {"), src...), '\n', '\n', '}')
+	file, err = parser.ParseFile(fset, filename, fsrc, parserMode)
+	if err == nil {
+		sourceAdj = func(src []byte, indent int) []byte {
+			// Cap adjusted indent to zero.
+			if indent < 0 {
+				indent = 0
+			}
+			// Remove the wrapping.
+			// Gofmt has turned the ; into a \n\n.
+			// There will be two non-blank lines with indent, hence 2*indent.
+			src = src[2*indent+len("package p\n\nfunc _() {"):]
+			// Remove only the "}\n" suffix: remaining whitespaces will be trimmed anyway
+			src = src[:len(src)-len("}\n")]
+			return bytes.TrimSpace(src)
+		}
+		// Gofmt has also indented the function body one level.
+		// Adjust that with indentAdj.
+		indentAdj = -1
+	}
+
+	// Succeeded, or out of options.
+	return
+}
+
+// format formats the given package file originally obtained from src
+// and adjusts the result based on the original source via sourceAdj
+// and indentAdj.
+func format(
+	fset *token.FileSet,
+	file *ast.File,
+	sourceAdj func(src []byte, indent int) []byte,
+	indentAdj int,
+	src []byte,
+	cfg printer.Config,
+) ([]byte, error) {
+	if sourceAdj == nil {
+		// Complete source file.
+		var buf bytes.Buffer
+		err := cfg.Fprint(&buf, fset, file)
+		if err != nil {
+			return nil, err
+		}
+		return buf.Bytes(), nil
+	}
+
+	// Partial source file.
+	// Determine and prepend leading space.
+	i, j := 0, 0
+	for j < len(src) && isSpace(src[j]) {
+		if src[j] == '\n' {
+			i = j + 1 // byte offset of last line in leading space
+		}
+		j++
+	}
+	var res []byte
+	res = append(res, src[:i]...)
+
+	// Determine and prepend indentation of first code line.
+	// Spaces are ignored unless there are no tabs,
+	// in which case spaces count as one tab.
+	indent := 0
+	hasSpace := false
+	for _, b := range src[i:j] {
+		switch b {
+		case ' ':
+			hasSpace = true
+		case '\t':
+			indent++
+		}
+	}
+	if indent == 0 && hasSpace {
+		indent = 1
+	}
+	for i := 0; i < indent; i++ {
+		res = append(res, '\t')
+	}
+
+	// Format the source.
+	// Write it without any leading and trailing space.
+	cfg.Indent = indent + indentAdj
+	var buf bytes.Buffer
+	err := cfg.Fprint(&buf, fset, file)
+	if err != nil {
+		return nil, err
+	}
+	out := sourceAdj(buf.Bytes(), cfg.Indent)
+
+	// If the adjusted output is empty, the source
+	// was empty but (possibly) for white space.
+	// The result is the incoming source.
+	if len(out) == 0 {
+		return src, nil
+	}
+
+	// Otherwise, append output to leading space.
+	res = append(res, out...)
+
+	// Determine and append trailing space.
+	i = len(src)
+	for i > 0 && isSpace(src[i-1]) {
+		i--
+	}
+	return append(res, src[i:]...), nil
+}
+
+// isSpace reports whether the byte is a space character.
+// isSpace defines a space as being among the following bytes: ' ', '\t', '\n' and '\r'.
+func isSpace(b byte) bool {
+	return b == ' ' || b == '\t' || b == '\n' || b == '\r'
+}
diff --git a/vendor/github.com/golangci/gofmt/gofmt/rewrite.go b/vendor/github.com/golangci/gofmt/gofmt/rewrite.go
new file mode 100644
index 000000000..73741e0a9
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/rewrite.go
@@ -0,0 +1,303 @@
+// 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 gofmt
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"reflect"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+func initRewrite() {
+	if *rewriteRule == "" {
+		rewrite = nil // disable any previous rewrite
+		return
+	}
+	f := strings.Split(*rewriteRule, "->")
+	if len(f) != 2 {
+		fmt.Fprintf(os.Stderr, "rewrite rule must be of the form 'pattern -> replacement'\n")
+		os.Exit(2)
+	}
+	pattern := parseExpr(f[0], "pattern")
+	replace := parseExpr(f[1], "replacement")
+	rewrite = func(p *ast.File) *ast.File { return rewriteFile(pattern, replace, p) }
+}
+
+// parseExpr parses s as an expression.
+// It might make sense to expand this to allow statement patterns,
+// but there are problems with preserving formatting and also
+// with what a wildcard for a statement looks like.
+func parseExpr(s, what string) ast.Expr {
+	x, err := parser.ParseExpr(s)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "parsing %s %s at %s\n", what, s, err)
+		os.Exit(2)
+	}
+	return x
+}
+
+// Keep this function for debugging.
+/*
+func dump(msg string, val reflect.Value) {
+	fmt.Printf("%s:\n", msg)
+	ast.Print(fileSet, val.Interface())
+	fmt.Println()
+}
+*/
+
+// rewriteFile applies the rewrite rule 'pattern -> replace' to an entire file.
+func rewriteFile(pattern, replace ast.Expr, p *ast.File) *ast.File {
+	cmap := ast.NewCommentMap(fileSet, p, p.Comments)
+	m := make(map[string]reflect.Value)
+	pat := reflect.ValueOf(pattern)
+	repl := reflect.ValueOf(replace)
+
+	var rewriteVal func(val reflect.Value) reflect.Value
+	rewriteVal = func(val reflect.Value) reflect.Value {
+		// don't bother if val is invalid to start with
+		if !val.IsValid() {
+			return reflect.Value{}
+		}
+		val = apply(rewriteVal, val)
+		for k := range m {
+			delete(m, k)
+		}
+		if match(m, pat, val) {
+			val = subst(m, repl, reflect.ValueOf(val.Interface().(ast.Node).Pos()))
+		}
+		return val
+	}
+
+	r := apply(rewriteVal, reflect.ValueOf(p)).Interface().(*ast.File)
+	r.Comments = cmap.Filter(r).Comments() // recreate comments list
+	return r
+}
+
+// set is a wrapper for x.Set(y); it protects the caller from panics if x cannot be changed to y.
+func set(x, y reflect.Value) {
+	// don't bother if x cannot be set or y is invalid
+	if !x.CanSet() || !y.IsValid() {
+		return
+	}
+	defer func() {
+		if x := recover(); x != nil {
+			if s, ok := x.(string); ok &&
+				(strings.Contains(s, "type mismatch") || strings.Contains(s, "not assignable")) {
+				// x cannot be set to y - ignore this rewrite
+				return
+			}
+			panic(x)
+		}
+	}()
+	x.Set(y)
+}
+
+// Values/types for special cases.
+var (
+	objectPtrNil = reflect.ValueOf((*ast.Object)(nil))
+	scopePtrNil  = reflect.ValueOf((*ast.Scope)(nil))
+
+	identType     = reflect.TypeOf((*ast.Ident)(nil))
+	objectPtrType = reflect.TypeOf((*ast.Object)(nil))
+	positionType  = reflect.TypeOf(token.NoPos)
+	callExprType  = reflect.TypeOf((*ast.CallExpr)(nil))
+	scopePtrType  = reflect.TypeOf((*ast.Scope)(nil))
+)
+
+// apply replaces each AST field x in val with f(x), returning val.
+// To avoid extra conversions, f operates on the reflect.Value form.
+func apply(f func(reflect.Value) reflect.Value, val reflect.Value) reflect.Value {
+	if !val.IsValid() {
+		return reflect.Value{}
+	}
+
+	// *ast.Objects introduce cycles and are likely incorrect after
+	// rewrite; don't follow them but replace with nil instead
+	if val.Type() == objectPtrType {
+		return objectPtrNil
+	}
+
+	// similarly for scopes: they are likely incorrect after a rewrite;
+	// replace them with nil
+	if val.Type() == scopePtrType {
+		return scopePtrNil
+	}
+
+	switch v := reflect.Indirect(val); v.Kind() {
+	case reflect.Slice:
+		for i := 0; i < v.Len(); i++ {
+			e := v.Index(i)
+			set(e, f(e))
+		}
+	case reflect.Struct:
+		for i := 0; i < v.NumField(); i++ {
+			e := v.Field(i)
+			set(e, f(e))
+		}
+	case reflect.Interface:
+		e := v.Elem()
+		set(v, f(e))
+	}
+	return val
+}
+
+func isWildcard(s string) bool {
+	rune, size := utf8.DecodeRuneInString(s)
+	return size == len(s) && unicode.IsLower(rune)
+}
+
+// match reports whether pattern matches val,
+// recording wildcard submatches in m.
+// If m == nil, match checks whether pattern == val.
+func match(m map[string]reflect.Value, pattern, val reflect.Value) bool {
+	// Wildcard matches any expression. If it appears multiple
+	// times in the pattern, it must match the same expression
+	// each time.
+	if m != nil && pattern.IsValid() && pattern.Type() == identType {
+		name := pattern.Interface().(*ast.Ident).Name
+		if isWildcard(name) && val.IsValid() {
+			// wildcards only match valid (non-nil) expressions.
+			if _, ok := val.Interface().(ast.Expr); ok && !val.IsNil() {
+				if old, ok := m[name]; ok {
+					return match(nil, old, val)
+				}
+				m[name] = val
+				return true
+			}
+		}
+	}
+
+	// Otherwise, pattern and val must match recursively.
+	if !pattern.IsValid() || !val.IsValid() {
+		return !pattern.IsValid() && !val.IsValid()
+	}
+	if pattern.Type() != val.Type() {
+		return false
+	}
+
+	// Special cases.
+	switch pattern.Type() {
+	case identType:
+		// For identifiers, only the names need to match
+		// (and none of the other *ast.Object information).
+		// This is a common case, handle it all here instead
+		// of recursing down any further via reflection.
+		p := pattern.Interface().(*ast.Ident)
+		v := val.Interface().(*ast.Ident)
+		return p == nil && v == nil || p != nil && v != nil && p.Name == v.Name
+	case objectPtrType, positionType:
+		// object pointers and token positions always match
+		return true
+	case callExprType:
+		// For calls, the Ellipsis fields (token.Position) must
+		// match since that is how f(x) and f(x...) are different.
+		// Check them here but fall through for the remaining fields.
+		p := pattern.Interface().(*ast.CallExpr)
+		v := val.Interface().(*ast.CallExpr)
+		if p.Ellipsis.IsValid() != v.Ellipsis.IsValid() {
+			return false
+		}
+	}
+
+	p := reflect.Indirect(pattern)
+	v := reflect.Indirect(val)
+	if !p.IsValid() || !v.IsValid() {
+		return !p.IsValid() && !v.IsValid()
+	}
+
+	switch p.Kind() {
+	case reflect.Slice:
+		if p.Len() != v.Len() {
+			return false
+		}
+		for i := 0; i < p.Len(); i++ {
+			if !match(m, p.Index(i), v.Index(i)) {
+				return false
+			}
+		}
+		return true
+
+	case reflect.Struct:
+		for i := 0; i < p.NumField(); i++ {
+			if !match(m, p.Field(i), v.Field(i)) {
+				return false
+			}
+		}
+		return true
+
+	case reflect.Interface:
+		return match(m, p.Elem(), v.Elem())
+	}
+
+	// Handle token integers, etc.
+	return p.Interface() == v.Interface()
+}
+
+// subst returns a copy of pattern with values from m substituted in place
+// of wildcards and pos used as the position of tokens from the pattern.
+// if m == nil, subst returns a copy of pattern and doesn't change the line
+// number information.
+func subst(m map[string]reflect.Value, pattern reflect.Value, pos reflect.Value) reflect.Value {
+	if !pattern.IsValid() {
+		return reflect.Value{}
+	}
+
+	// Wildcard gets replaced with map value.
+	if m != nil && pattern.Type() == identType {
+		name := pattern.Interface().(*ast.Ident).Name
+		if isWildcard(name) {
+			if old, ok := m[name]; ok {
+				return subst(nil, old, reflect.Value{})
+			}
+		}
+	}
+
+	if pos.IsValid() && pattern.Type() == positionType {
+		// use new position only if old position was valid in the first place
+		if old := pattern.Interface().(token.Pos); !old.IsValid() {
+			return pattern
+		}
+		return pos
+	}
+
+	// Otherwise copy.
+	switch p := pattern; p.Kind() {
+	case reflect.Slice:
+		v := reflect.MakeSlice(p.Type(), p.Len(), p.Len())
+		for i := 0; i < p.Len(); i++ {
+			v.Index(i).Set(subst(m, p.Index(i), pos))
+		}
+		return v
+
+	case reflect.Struct:
+		v := reflect.New(p.Type()).Elem()
+		for i := 0; i < p.NumField(); i++ {
+			v.Field(i).Set(subst(m, p.Field(i), pos))
+		}
+		return v
+
+	case reflect.Ptr:
+		v := reflect.New(p.Type()).Elem()
+		if elem := p.Elem(); elem.IsValid() {
+			v.Set(subst(m, elem, pos).Addr())
+		}
+		return v
+
+	case reflect.Interface:
+		v := reflect.New(p.Type()).Elem()
+		if elem := p.Elem(); elem.IsValid() {
+			v.Set(subst(m, elem, pos))
+		}
+		return v
+	}
+
+	return pattern
+}
diff --git a/vendor/github.com/golangci/gofmt/gofmt/simplify.go b/vendor/github.com/golangci/gofmt/gofmt/simplify.go
new file mode 100644
index 000000000..2c75495a6
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/gofmt/simplify.go
@@ -0,0 +1,165 @@
+// Copyright 2010 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 gofmt
+
+import (
+	"go/ast"
+	"go/token"
+	"reflect"
+)
+
+type simplifier struct{}
+
+func (s simplifier) Visit(node ast.Node) ast.Visitor {
+	switch n := node.(type) {
+	case *ast.CompositeLit:
+		// array, slice, and map composite literals may be simplified
+		outer := n
+		var keyType, eltType ast.Expr
+		switch typ := outer.Type.(type) {
+		case *ast.ArrayType:
+			eltType = typ.Elt
+		case *ast.MapType:
+			keyType = typ.Key
+			eltType = typ.Value
+		}
+
+		if eltType != nil {
+			var ktyp reflect.Value
+			if keyType != nil {
+				ktyp = reflect.ValueOf(keyType)
+			}
+			typ := reflect.ValueOf(eltType)
+			for i, x := range outer.Elts {
+				px := &outer.Elts[i]
+				// look at value of indexed/named elements
+				if t, ok := x.(*ast.KeyValueExpr); ok {
+					if keyType != nil {
+						s.simplifyLiteral(ktyp, keyType, t.Key, &t.Key)
+					}
+					x = t.Value
+					px = &t.Value
+				}
+				s.simplifyLiteral(typ, eltType, x, px)
+			}
+			// node was simplified - stop walk (there are no subnodes to simplify)
+			return nil
+		}
+
+	case *ast.SliceExpr:
+		// a slice expression of the form: s[a:len(s)]
+		// can be simplified to: s[a:]
+		// if s is "simple enough" (for now we only accept identifiers)
+		//
+		// Note: This may not be correct because len may have been redeclared in another
+		//       file belonging to the same package. However, this is extremely unlikely
+		//       and so far (April 2016, after years of supporting this rewrite feature)
+		//       has never come up, so let's keep it working as is (see also #15153).
+		if n.Max != nil {
+			// - 3-index slices always require the 2nd and 3rd index
+			break
+		}
+		if s, _ := n.X.(*ast.Ident); s != nil && s.Obj != nil {
+			// the array/slice object is a single, resolved identifier
+			if call, _ := n.High.(*ast.CallExpr); call != nil && len(call.Args) == 1 && !call.Ellipsis.IsValid() {
+				// the high expression is a function call with a single argument
+				if fun, _ := call.Fun.(*ast.Ident); fun != nil && fun.Name == "len" && fun.Obj == nil {
+					// the function called is "len" and it is not locally defined; and
+					// because we don't have dot imports, it must be the predefined len()
+					if arg, _ := call.Args[0].(*ast.Ident); arg != nil && arg.Obj == s.Obj {
+						// the len argument is the array/slice object
+						n.High = nil
+					}
+				}
+			}
+		}
+		// Note: We could also simplify slice expressions of the form s[0:b] to s[:b]
+		//       but we leave them as is since sometimes we want to be very explicit
+		//       about the lower bound.
+		// An example where the 0 helps:
+		//       x, y, z := b[0:2], b[2:4], b[4:6]
+		// An example where it does not:
+		//       x, y := b[:n], b[n:]
+
+	case *ast.RangeStmt:
+		// - a range of the form: for x, _ = range v {...}
+		// can be simplified to: for x = range v {...}
+		// - a range of the form: for _ = range v {...}
+		// can be simplified to: for range v {...}
+		if isBlank(n.Value) {
+			n.Value = nil
+		}
+		if isBlank(n.Key) && n.Value == nil {
+			n.Key = nil
+		}
+	}
+
+	return s
+}
+
+func (s simplifier) simplifyLiteral(typ reflect.Value, astType, x ast.Expr, px *ast.Expr) {
+	ast.Walk(s, x) // simplify x
+
+	// if the element is a composite literal and its literal type
+	// matches the outer literal's element type exactly, the inner
+	// literal type may be omitted
+	if inner, ok := x.(*ast.CompositeLit); ok {
+		if match(nil, typ, reflect.ValueOf(inner.Type)) {
+			inner.Type = nil
+		}
+	}
+	// if the outer literal's element type is a pointer type *T
+	// and the element is & of a composite literal of type T,
+	// the inner &T may be omitted.
+	if ptr, ok := astType.(*ast.StarExpr); ok {
+		if addr, ok := x.(*ast.UnaryExpr); ok && addr.Op == token.AND {
+			if inner, ok := addr.X.(*ast.CompositeLit); ok {
+				if match(nil, reflect.ValueOf(ptr.X), reflect.ValueOf(inner.Type)) {
+					inner.Type = nil // drop T
+					*px = inner      // drop &
+				}
+			}
+		}
+	}
+}
+
+func isBlank(x ast.Expr) bool {
+	ident, ok := x.(*ast.Ident)
+	return ok && ident.Name == "_"
+}
+
+func simplify(f *ast.File) {
+	// remove empty declarations such as "const ()", etc
+	removeEmptyDeclGroups(f)
+
+	var s simplifier
+	ast.Walk(s, f)
+}
+
+func removeEmptyDeclGroups(f *ast.File) {
+	i := 0
+	for _, d := range f.Decls {
+		if g, ok := d.(*ast.GenDecl); !ok || !isEmpty(f, g) {
+			f.Decls[i] = d
+			i++
+		}
+	}
+	f.Decls = f.Decls[:i]
+}
+
+func isEmpty(f *ast.File, g *ast.GenDecl) bool {
+	if g.Doc != nil || g.Specs != nil {
+		return false
+	}
+
+	for _, c := range f.Comments {
+		// if there is a comment in the declaration, it is not considered empty
+		if g.Pos() <= c.Pos() && c.End() <= g.End() {
+			return false
+		}
+	}
+
+	return true
+}
diff --git a/vendor/github.com/golangci/gofmt/goimports/LICENSE b/vendor/github.com/golangci/gofmt/goimports/LICENSE
new file mode 100644
index 000000000..6a66aea5e
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/goimports/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/golangci/gofmt/goimports/goimports.go b/vendor/github.com/golangci/gofmt/goimports/goimports.go
new file mode 100644
index 000000000..8878b700d
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/goimports/goimports.go
@@ -0,0 +1,358 @@
+// 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 goimports
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"go/scanner"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"strings"
+
+	"golang.org/x/tools/imports"
+)
+
+var (
+	// main operation modes
+	list    = flag.Bool("goimports.l", false, "list files whose formatting differs from goimport's")
+	write   = flag.Bool("goimports.w", false, "write result to (source) file instead of stdout")
+	doDiff  = flag.Bool("goimports.d", false, "display diffs instead of rewriting files")
+	srcdir  = flag.String("goimports.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("goimports.cpuprofile", "", "CPU profile output")
+	memProfile     = flag.String("goimports.memprofile", "", "memory profile output")
+	memProfileRate = flag.Int("goimports.memrate", 0, "if > 0, sets runtime.MemProfileRate")
+
+	options = &imports.Options{
+		TabWidth:  8,
+		TabIndent: true,
+		Comments:  true,
+		Fragment:  true,
+	}
+	exitCode = 0
+)
+
+func init() {
+	flag.BoolVar(&options.AllErrors, "goimports.e", false, "report all errors (not just the first 10 on different lines)")
+	flag.StringVar(&imports.LocalPrefix, "goimports.local", "", "put imports beginning with this string after 3rd-party packages; comma-separated list")
+}
+
+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")
+			}
+			err = ioutil.WriteFile(filename, res, 0)
+			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)
+}
+
+// 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.
+	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)
+		imports.Debug = true
+	}
+	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()
+}
diff --git a/vendor/github.com/golangci/gofmt/goimports/golangci.go b/vendor/github.com/golangci/gofmt/goimports/golangci.go
new file mode 100644
index 000000000..e9d013d58
--- /dev/null
+++ b/vendor/github.com/golangci/gofmt/goimports/golangci.go
@@ -0,0 +1,33 @@
+package goimports
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+
+	"golang.org/x/tools/imports"
+)
+
+func Run(filename string) ([]byte, error) {
+	src, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := imports.Process(filename, src, options)
+	if err != nil {
+		return nil, err
+	}
+
+	if bytes.Equal(src, res) {
+		return nil, nil
+	}
+
+	// formatting has changed
+	data, err := diff(src, res, filename)
+	if err != nil {
+		return nil, fmt.Errorf("error computing diff: %s", err)
+	}
+
+	return data, nil
+}