vendor/github.com/spf13/afero/util.go - gddo - Git at Google

 // Copyright ©2015 Steve Francia <spf@spf13.com>
 // Portions Copyright ©2015 The Hugo Authors
 // Portions Copyright 2016-present Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package afero

 import (
 	"bytes"
 	"fmt"
 	"io"
 	"log"
 	"os"
 	"path/filepath"
 	"strings"
 	"unicode"

 	"golang.org/x/text/transform"
 	"golang.org/x/text/unicode/norm"
 )

 // Filepath separator defined by os.Separator.
 const FilePathSeparator = string(filepath.Separator)

 // Takes a reader and a path and writes the content
 func (a Afero) WriteReader(path string, r io.Reader) (err error) {
 	return WriteReader(a.Fs, path, r)
 }

 func WriteReader(fs Fs, path string, r io.Reader) (err error) {
 	dir, _ := filepath.Split(path)
 	ospath := filepath.FromSlash(dir)

 	if ospath != "" {
 		err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
 		if err != nil {
 			if err != os.ErrExist {
 				log.Panicln(err)
 			}
 		}
 	}

 	file, err := fs.Create(path)
 	if err != nil {
 		return
 	}
 	defer file.Close()

 	_, err = io.Copy(file, r)
 	return
 }

 // Same as WriteReader but checks to see if file/directory already exists.
 func (a Afero) SafeWriteReader(path string, r io.Reader) (err error) {
 	return SafeWriteReader(a.Fs, path, r)
 }

 func SafeWriteReader(fs Fs, path string, r io.Reader) (err error) {
 	dir, _ := filepath.Split(path)
 	ospath := filepath.FromSlash(dir)

 	if ospath != "" {
 		err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
 		if err != nil {
 			return
 		}
 	}

 	exists, err := Exists(fs, path)
 	if err != nil {
 		return
 	}
 	if exists {
 		return fmt.Errorf("%v already exists", path)
 	}

 	file, err := fs.Create(path)
 	if err != nil {
 		return
 	}
 	defer file.Close()

 	_, err = io.Copy(file, r)
 	return
 }

 func (a Afero) GetTempDir(subPath string) string {
 	return GetTempDir(a.Fs, subPath)
 }

 // GetTempDir returns the default temp directory with trailing slash
 // if subPath is not empty then it will be created recursively with mode 777 rwx rwx rwx
 func GetTempDir(fs Fs, subPath string) string {
 	addSlash := func(p string) string {
 		if FilePathSeparator != p[len(p)-1:] {
 			p = p + FilePathSeparator
 		}
 		return p
 	}
 	dir := addSlash(os.TempDir())

 	if subPath != "" {
 		// preserve windows backslash :-(
 		if FilePathSeparator == "\\" {
 			subPath = strings.Replace(subPath, "\\", "____", -1)
 		}
 		dir = dir + UnicodeSanitize((subPath))
 		if FilePathSeparator == "\\" {
 			dir = strings.Replace(dir, "____", "\\", -1)
 		}

 		if exists, _ := Exists(fs, dir); exists {
 			return addSlash(dir)
 		}

 		err := fs.MkdirAll(dir, 0777)
 		if err != nil {
 			panic(err)
 		}
 		dir = addSlash(dir)
 	}
 	return dir
 }

 // Rewrite string to remove non-standard path characters
 func UnicodeSanitize(s string) string {
 	source := []rune(s)
 	target := make([]rune, 0, len(source))

 	for _, r := range source {
 		if unicode.IsLetter(r) ||
 			unicode.IsDigit(r) ||
 			unicode.IsMark(r) ||
 			r == '.' ||
 			r == '/' ||
 			r == '\\' ||
 			r == '_' ||
 			r == '-' ||
 			r == '%' ||
 			r == ' ' ||
 			r == '#' {
 			target = append(target, r)
 		}
 	}

 	return string(target)
 }

 // Transform characters with accents into plan forms
 func NeuterAccents(s string) string {
 	t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC)
 	result, _, _ := transform.String(t, string(s))

 	return result
 }

 func isMn(r rune) bool {
 	return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks
 }

 func (a Afero) FileContainsBytes(filename string, subslice []byte) (bool, error) {
 	return FileContainsBytes(a.Fs, filename, subslice)
 }

 // Check if a file contains a specified byte slice.
 func FileContainsBytes(fs Fs, filename string, subslice []byte) (bool, error) {
 	f, err := fs.Open(filename)
 	if err != nil {
 		return false, err
 	}
 	defer f.Close()

 	return readerContainsAny(f, subslice), nil
 }

 func (a Afero) FileContainsAnyBytes(filename string, subslices [][]byte) (bool, error) {
 	return FileContainsAnyBytes(a.Fs, filename, subslices)
 }

 // Check if a file contains any of the specified byte slices.
 func FileContainsAnyBytes(fs Fs, filename string, subslices [][]byte) (bool, error) {
 	f, err := fs.Open(filename)
 	if err != nil {
 		return false, err
 	}
 	defer f.Close()

 	return readerContainsAny(f, subslices...), nil
 }

 // readerContains reports whether any of the subslices is within r.
 func readerContainsAny(r io.Reader, subslices ...[]byte) bool {

 	if r == nil || len(subslices) == 0 {
 		return false
 	}

 	largestSlice := 0

 	for _, sl := range subslices {
 		if len(sl) > largestSlice {
 			largestSlice = len(sl)
 		}
 	}

 	if largestSlice == 0 {
 		return false
 	}

 	bufflen := largestSlice * 4
 	halflen := bufflen / 2
 	buff := make([]byte, bufflen)
 	var err error
 	var n, i int

 	for {
 		i++
 		if i == 1 {
 			n, err = io.ReadAtLeast(r, buff[:halflen], halflen)
 		} else {
 			if i != 2 {
 				// shift left to catch overlapping matches
 				copy(buff[:], buff[halflen:])
 			}
 			n, err = io.ReadAtLeast(r, buff[halflen:], halflen)
 		}

 		if n > 0 {
 			for _, sl := range subslices {
 				if bytes.Contains(buff, sl) {
 					return true
 				}
 			}
 		}

 		if err != nil {
 			break
 		}
 	}
 	return false
 }

 func (a Afero) DirExists(path string) (bool, error) {
 	return DirExists(a.Fs, path)
 }

 // DirExists checks if a path exists and is a directory.
 func DirExists(fs Fs, path string) (bool, error) {
 	fi, err := fs.Stat(path)
 	if err == nil && fi.IsDir() {
 		return true, nil
 	}
 	if os.IsNotExist(err) {
 		return false, nil
 	}
 	return false, err
 }

 func (a Afero) IsDir(path string) (bool, error) {
 	return IsDir(a.Fs, path)
 }

 // IsDir checks if a given path is a directory.
 func IsDir(fs Fs, path string) (bool, error) {
 	fi, err := fs.Stat(path)
 	if err != nil {
 		return false, err
 	}
 	return fi.IsDir(), nil
 }

 func (a Afero) IsEmpty(path string) (bool, error) {
 	return IsEmpty(a.Fs, path)
 }

 // IsEmpty checks if a given file or directory is empty.
 func IsEmpty(fs Fs, path string) (bool, error) {
 	if b, _ := Exists(fs, path); !b {
 		return false, fmt.Errorf("%q path does not exist", path)
 	}
 	fi, err := fs.Stat(path)
 	if err != nil {
 		return false, err
 	}
 	if fi.IsDir() {
 		f, err := fs.Open(path)
 		if err != nil {
 			return false, err
 		}
 		defer f.Close()
 		list, err := f.Readdir(-1)
 		return len(list) == 0, nil
 	}
 	return fi.Size() == 0, nil
 }

 func (a Afero) Exists(path string) (bool, error) {
 	return Exists(a.Fs, path)
 }

 // Check if a file or directory exists.
 func Exists(fs Fs, path string) (bool, error) {
 	_, err := fs.Stat(path)
 	if err == nil {
 		return true, nil
 	}
 	if os.IsNotExist(err) {
 		return false, nil
 	}
 	return false, err
 }

 func FullBaseFsPath(basePathFs *BasePathFs, relativePath string) string {
 	combinedPath := filepath.Join(basePathFs.path, relativePath)
 	if parent, ok := basePathFs.source.(*BasePathFs); ok {
 		return FullBaseFsPath(parent, combinedPath)
 	}

 	return combinedPath
 }
	// Copyright ©2015 Steve Francia <spf@spf13.com>
	// Portions Copyright ©2015 The Hugo Authors
	// Portions Copyright 2016-present Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package afero

	import (
	"bytes"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"unicode"

	"golang.org/x/text/transform"
	"golang.org/x/text/unicode/norm"
	)

	// Filepath separator defined by os.Separator.
	const FilePathSeparator = string(filepath.Separator)

	// Takes a reader and a path and writes the content
	func (a Afero) WriteReader(path string, r io.Reader) (err error) {
	return WriteReader(a.Fs, path, r)
	}

	func WriteReader(fs Fs, path string, r io.Reader) (err error) {
	dir, _ := filepath.Split(path)
	ospath := filepath.FromSlash(dir)

	if ospath != "" {
	err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
	if err != nil {
	if err != os.ErrExist {
	log.Panicln(err)
	}
	}
	}

	file, err := fs.Create(path)
	if err != nil {
	return
	}
	defer file.Close()

	_, err = io.Copy(file, r)
	return
	}

	// Same as WriteReader but checks to see if file/directory already exists.
	func (a Afero) SafeWriteReader(path string, r io.Reader) (err error) {
	return SafeWriteReader(a.Fs, path, r)
	}

	func SafeWriteReader(fs Fs, path string, r io.Reader) (err error) {
	dir, _ := filepath.Split(path)
	ospath := filepath.FromSlash(dir)

	if ospath != "" {
	err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
	if err != nil {
	return
	}
	}

	exists, err := Exists(fs, path)
	if err != nil {
	return
	}
	if exists {
	return fmt.Errorf("%v already exists", path)
	}

	file, err := fs.Create(path)
	if err != nil {
	return
	}
	defer file.Close()

	_, err = io.Copy(file, r)
	return
	}

	func (a Afero) GetTempDir(subPath string) string {
	return GetTempDir(a.Fs, subPath)
	}

	// GetTempDir returns the default temp directory with trailing slash
	// if subPath is not empty then it will be created recursively with mode 777 rwx rwx rwx
	func GetTempDir(fs Fs, subPath string) string {
	addSlash := func(p string) string {
	if FilePathSeparator != p[len(p)-1:] {
	p = p + FilePathSeparator
	}
	return p
	}
	dir := addSlash(os.TempDir())

	if subPath != "" {
	// preserve windows backslash :-(
	if FilePathSeparator == "\\" {
	subPath = strings.Replace(subPath, "\\", "____", -1)
	}
	dir = dir + UnicodeSanitize((subPath))
	if FilePathSeparator == "\\" {
	dir = strings.Replace(dir, "____", "\\", -1)
	}

	if exists, _ := Exists(fs, dir); exists {
	return addSlash(dir)
	}

	err := fs.MkdirAll(dir, 0777)
	if err != nil {
	panic(err)
	}
	dir = addSlash(dir)
	}
	return dir
	}

	// Rewrite string to remove non-standard path characters
	func UnicodeSanitize(s string) string {
	source := []rune(s)
	target := make([]rune, 0, len(source))

	for _, r := range source {
	if unicode.IsLetter(r) \|\|
	unicode.IsDigit(r) \|\|
	unicode.IsMark(r) \|\|
	r == '.' \|\|
	r == '/' \|\|
	r == '\\' \|\|
	r == '_' \|\|
	r == '-' \|\|
	r == '%' \|\|
	r == ' ' \|\|
	r == '#' {
	target = append(target, r)
	}
	}

	return string(target)
	}

	// Transform characters with accents into plan forms
	func NeuterAccents(s string) string {
	t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC)
	result, _, _ := transform.String(t, string(s))

	return result
	}

	func isMn(r rune) bool {
	return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks
	}

	func (a Afero) FileContainsBytes(filename string, subslice []byte) (bool, error) {
	return FileContainsBytes(a.Fs, filename, subslice)
	}

	// Check if a file contains a specified byte slice.
	func FileContainsBytes(fs Fs, filename string, subslice []byte) (bool, error) {
	f, err := fs.Open(filename)
	if err != nil {
	return false, err
	}
	defer f.Close()

	return readerContainsAny(f, subslice), nil
	}

	func (a Afero) FileContainsAnyBytes(filename string, subslices [][]byte) (bool, error) {
	return FileContainsAnyBytes(a.Fs, filename, subslices)
	}

	// Check if a file contains any of the specified byte slices.
	func FileContainsAnyBytes(fs Fs, filename string, subslices [][]byte) (bool, error) {
	f, err := fs.Open(filename)
	if err != nil {
	return false, err
	}
	defer f.Close()

	return readerContainsAny(f, subslices...), nil
	}

	// readerContains reports whether any of the subslices is within r.
	func readerContainsAny(r io.Reader, subslices ...[]byte) bool {

	if r == nil \|\| len(subslices) == 0 {
	return false
	}

	largestSlice := 0

	for _, sl := range subslices {
	if len(sl) > largestSlice {
	largestSlice = len(sl)
	}
	}

	if largestSlice == 0 {
	return false
	}

	bufflen := largestSlice * 4
	halflen := bufflen / 2
	buff := make([]byte, bufflen)
	var err error
	var n, i int

	for {
	i++
	if i == 1 {
	n, err = io.ReadAtLeast(r, buff[:halflen], halflen)
	} else {
	if i != 2 {
	// shift left to catch overlapping matches
	copy(buff[:], buff[halflen:])
	}
	n, err = io.ReadAtLeast(r, buff[halflen:], halflen)
	}

	if n > 0 {
	for _, sl := range subslices {
	if bytes.Contains(buff, sl) {
	return true
	}
	}
	}

	if err != nil {
	break
	}
	}
	return false
	}

	func (a Afero) DirExists(path string) (bool, error) {
	return DirExists(a.Fs, path)
	}

	// DirExists checks if a path exists and is a directory.
	func DirExists(fs Fs, path string) (bool, error) {
	fi, err := fs.Stat(path)
	if err == nil && fi.IsDir() {
	return true, nil
	}
	if os.IsNotExist(err) {
	return false, nil
	}
	return false, err
	}

	func (a Afero) IsDir(path string) (bool, error) {
	return IsDir(a.Fs, path)
	}

	// IsDir checks if a given path is a directory.
	func IsDir(fs Fs, path string) (bool, error) {
	fi, err := fs.Stat(path)
	if err != nil {
	return false, err
	}
	return fi.IsDir(), nil
	}

	func (a Afero) IsEmpty(path string) (bool, error) {
	return IsEmpty(a.Fs, path)
	}

	// IsEmpty checks if a given file or directory is empty.
	func IsEmpty(fs Fs, path string) (bool, error) {
	if b, _ := Exists(fs, path); !b {
	return false, fmt.Errorf("%q path does not exist", path)
	}
	fi, err := fs.Stat(path)
	if err != nil {
	return false, err
	}
	if fi.IsDir() {
	f, err := fs.Open(path)
	if err != nil {
	return false, err
	}
	defer f.Close()
	list, err := f.Readdir(-1)
	return len(list) == 0, nil
	}
	return fi.Size() == 0, nil
	}

	func (a Afero) Exists(path string) (bool, error) {
	return Exists(a.Fs, path)
	}

	// Check if a file or directory exists.
	func Exists(fs Fs, path string) (bool, error) {
	_, err := fs.Stat(path)
	if err == nil {
	return true, nil
	}
	if os.IsNotExist(err) {
	return false, nil
	}
	return false, err
	}

	func FullBaseFsPath(basePathFs *BasePathFs, relativePath string) string {
	combinedPath := filepath.Join(basePathFs.path, relativePath)
	if parent, ok := basePathFs.source.(*BasePathFs); ok {
	return FullBaseFsPath(parent, combinedPath)
	}

	return combinedPath
	}