ref: 9d020348810e440ee82926789f8b95cd6e7458cd
dir: /helpers/path.go/
// Copyright 2019 The Hugo Authors. All rights reserved.
//
// 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 helpers
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"unicode"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/common/hugio"
_errors "github.com/pkg/errors"
"github.com/spf13/afero"
"golang.org/x/text/runes"
"golang.org/x/text/transform"
"golang.org/x/text/unicode/norm"
)
var (
// ErrThemeUndefined is returned when a theme has not be defined by the user.
ErrThemeUndefined = errors.New("no theme set")
)
// filepathPathBridge is a bridge for common functionality in filepath vs path
type filepathPathBridge interface {
Base(in string) string
Clean(in string) string
Dir(in string) string
Ext(in string) string
Join(elem ...string) string
Separator() string
}
type filepathBridge struct {
}
func (filepathBridge) Base(in string) string {
return filepath.Base(in)
}
func (filepathBridge) Clean(in string) string {
return filepath.Clean(in)
}
func (filepathBridge) Dir(in string) string {
return filepath.Dir(in)
}
func (filepathBridge) Ext(in string) string {
return filepath.Ext(in)
}
func (filepathBridge) Join(elem ...string) string {
return filepath.Join(elem...)
}
func (filepathBridge) Separator() string {
return FilePathSeparator
}
var fpb filepathBridge
// MakePath takes a string with any characters and replace it
// so the string could be used in a path.
// It does so by creating a Unicode-sanitized string, with the spaces replaced,
// whilst preserving the original casing of the string.
// E.g. Social Media -> Social-Media
func (p *PathSpec) MakePath(s string) string {
return p.UnicodeSanitize(s)
}
// MakePathsSanitized applies MakePathSanitized on every item in the slice
func (p *PathSpec) MakePathsSanitized(paths []string) {
for i, path := range paths {
paths[i] = p.MakePathSanitized(path)
}
}
// MakePathSanitized creates a Unicode-sanitized string, with the spaces replaced
func (p *PathSpec) MakePathSanitized(s string) string {
if p.DisablePathToLower {
return p.MakePath(s)
}
return strings.ToLower(p.MakePath(s))
}
// ToSlashTrimLeading is just a filepath.ToSlaas with an added / prefix trimmer.
func ToSlashTrimLeading(s string) string {
return strings.TrimPrefix(filepath.ToSlash(s), "/")
}
// MakeTitle converts the path given to a suitable title, trimming whitespace
// and replacing hyphens with whitespace.
func MakeTitle(inpath string) string {
return strings.Replace(strings.TrimSpace(inpath), "-", " ", -1)
}
// From https://golang.org/src/net/url/url.go
func ishex(c rune) bool {
switch {
case '0' <= c && c <= '9':
return true
case 'a' <= c && c <= 'f':
return true
case 'A' <= c && c <= 'F':
return true
}
return false
}
// UnicodeSanitize sanitizes string to be used in Hugo URL's, allowing only
// a predefined set of special Unicode characters.
// If RemovePathAccents configuration flag is enabled, Uniccode accents
// are also removed.
// Spaces will be replaced with a single hyphen, and sequential hyphens will be reduced to one.
func (p *PathSpec) UnicodeSanitize(s string) string {
source := []rune(s)
target := make([]rune, 0, len(source))
var prependHyphen bool
for i, r := range source {
isAllowed := r == '.' || r == '/' || r == '\\' || r == '_' || r == '#' || r == '+' || r == '~'
isAllowed = isAllowed || unicode.IsLetter(r) || unicode.IsDigit(r) || unicode.IsMark(r)
isAllowed = isAllowed || (r == '%' && i+2 < len(source) && ishex(source[i+1]) && ishex(source[i+2]))
if isAllowed {
if prependHyphen {
target = append(target, '-')
prependHyphen = false
}
target = append(target, r)
} else if len(target) > 0 && (r == '-' || unicode.IsSpace(r)) {
prependHyphen = true
}
}
var result string
if p.RemovePathAccents {
// remove accents - see https://blog.golang.org/normalization
t := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
result, _, _ = transform.String(t, string(target))
} else {
result = string(target)
}
return result
}
// ReplaceExtension takes a path and an extension, strips the old extension
// and returns the path with the new extension.
func ReplaceExtension(path string, newExt string) string {
f, _ := fileAndExt(path, fpb)
return f + "." + newExt
}
// GetFirstThemeDir gets the root directory of the first theme, if there is one.
// If there is no theme, returns the empty string.
func (p *PathSpec) GetFirstThemeDir() string {
if p.ThemeSet() {
return p.AbsPathify(filepath.Join(p.ThemesDir, p.Themes()[0]))
}
return ""
}
// GetThemesDir gets the absolute root theme dir path.
func (p *PathSpec) GetThemesDir() string {
if p.ThemeSet() {
return p.AbsPathify(p.ThemesDir)
}
return ""
}
// GetRelativeThemeDir gets the relative root directory of the current theme, if there is one.
// If there is no theme, returns the empty string.
func (p *PathSpec) GetRelativeThemeDir() string {
if p.ThemeSet() {
return strings.TrimPrefix(filepath.Join(p.ThemesDir, p.Themes()[0]), FilePathSeparator)
}
return ""
}
func makePathRelative(inPath string, possibleDirectories ...string) (string, error) {
for _, currentPath := range possibleDirectories {
if strings.HasPrefix(inPath, currentPath) {
return strings.TrimPrefix(inPath, currentPath), nil
}
}
return inPath, errors.New("can't extract relative path, unknown prefix")
}
// Should be good enough for Hugo.
var isFileRe = regexp.MustCompile(`.*\..{1,6}$`)
// GetDottedRelativePath expects a relative path starting after the content directory.
// It returns a relative path with dots ("..") navigating up the path structure.
func GetDottedRelativePath(inPath string) string {
inPath = filepath.Clean(filepath.FromSlash(inPath))
if inPath == "." {
return "./"
}
if !isFileRe.MatchString(inPath) && !strings.HasSuffix(inPath, FilePathSeparator) {
inPath += FilePathSeparator
}
if !strings.HasPrefix(inPath, FilePathSeparator) {
inPath = FilePathSeparator + inPath
}
dir, _ := filepath.Split(inPath)
sectionCount := strings.Count(dir, FilePathSeparator)
if sectionCount == 0 || dir == FilePathSeparator {
return "./"
}
var dottedPath string
for i := 1; i < sectionCount; i++ {
dottedPath += "../"
}
return dottedPath
}
// ExtNoDelimiter takes a path and returns the extension, excluding the delmiter, i.e. "md".
func ExtNoDelimiter(in string) string {
return strings.TrimPrefix(Ext(in), ".")
}
// Ext takes a path and returns the extension, including the delmiter, i.e. ".md".
func Ext(in string) string {
_, ext := fileAndExt(in, fpb)
return ext
}
// PathAndExt is the same as FileAndExt, but it uses the path package.
func PathAndExt(in string) (string, string) {
return fileAndExt(in, pb)
}
// FileAndExt takes a path and returns the file and extension separated,
// the extension including the delmiter, i.e. ".md".
func FileAndExt(in string) (string, string) {
return fileAndExt(in, fpb)
}
// FileAndExtNoDelimiter takes a path and returns the file and extension separated,
// the extension excluding the delmiter, e.g "md".
func FileAndExtNoDelimiter(in string) (string, string) {
file, ext := fileAndExt(in, fpb)
return file, strings.TrimPrefix(ext, ".")
}
// Filename takes a path, strips out the extension,
// and returns the name of the file.
func Filename(in string) (name string) {
name, _ = fileAndExt(in, fpb)
return
}
// FileAndExt returns the filename and any extension of a file path as
// two separate strings.
//
// If the path, in, contains a directory name ending in a slash,
// then both name and ext will be empty strings.
//
// If the path, in, is either the current directory, the parent
// directory or the root directory, or an empty string,
// then both name and ext will be empty strings.
//
// If the path, in, represents the path of a file without an extension,
// then name will be the name of the file and ext will be an empty string.
//
// If the path, in, represents a filename with an extension,
// then name will be the filename minus any extension - including the dot
// and ext will contain the extension - minus the dot.
func fileAndExt(in string, b filepathPathBridge) (name string, ext string) {
ext = b.Ext(in)
base := b.Base(in)
return extractFilename(in, ext, base, b.Separator()), ext
}
func extractFilename(in, ext, base, pathSeparator string) (name string) {
// No file name cases. These are defined as:
// 1. any "in" path that ends in a pathSeparator
// 2. any "base" consisting of just an pathSeparator
// 3. any "base" consisting of just an empty string
// 4. any "base" consisting of just the current directory i.e. "."
// 5. any "base" consisting of just the parent directory i.e. ".."
if (strings.LastIndex(in, pathSeparator) == len(in)-1) || base == "" || base == "." || base == ".." || base == pathSeparator {
name = "" // there is NO filename
} else if ext != "" { // there was an Extension
// return the filename minus the extension (and the ".")
name = base[:strings.LastIndex(base, ".")]
} else {
// no extension case so just return base, which willi
// be the filename
name = base
}
return
}
// GetRelativePath returns the relative path of a given path.
func GetRelativePath(path, base string) (final string, err error) {
if filepath.IsAbs(path) && base == "" {
return "", errors.New("source: missing base directory")
}
name := filepath.Clean(path)
base = filepath.Clean(base)
name, err = filepath.Rel(base, name)
if err != nil {
return "", err
}
if strings.HasSuffix(filepath.FromSlash(path), FilePathSeparator) && !strings.HasSuffix(name, FilePathSeparator) {
name += FilePathSeparator
}
return name, nil
}
// PathPrep prepares the path using the uglify setting to create paths on
// either the form /section/name/index.html or /section/name.html.
func PathPrep(ugly bool, in string) string {
if ugly {
return Uglify(in)
}
return PrettifyPath(in)
}
// PrettifyPath is the same as PrettifyURLPath but for file paths.
// /section/name.html becomes /section/name/index.html
// /section/name/ becomes /section/name/index.html
// /section/name/index.html becomes /section/name/index.html
func PrettifyPath(in string) string {
return prettifyPath(in, fpb)
}
func prettifyPath(in string, b filepathPathBridge) string {
if filepath.Ext(in) == "" {
// /section/name/ -> /section/name/index.html
if len(in) < 2 {
return b.Separator()
}
return b.Join(in, "index.html")
}
name, ext := fileAndExt(in, b)
if name == "index" {
// /section/name/index.html -> /section/name/index.html
return b.Clean(in)
}
// /section/name.html -> /section/name/index.html
return b.Join(b.Dir(in), name, "index"+ext)
}
// ExtractRootPaths extracts the root paths from the supplied list of paths.
// The resulting root path will not contain any file separators, but there
// may be duplicates.
// So "/content/section/" becomes "content"
func ExtractRootPaths(paths []string) []string {
r := make([]string, len(paths))
for i, p := range paths {
root := filepath.ToSlash(p)
sections := strings.Split(root, "/")
for _, section := range sections {
if section != "" {
root = section
break
}
}
r[i] = root
}
return r
}
// FindCWD returns the current working directory from where the Hugo
// executable is run.
func FindCWD() (string, error) {
serverFile, err := filepath.Abs(os.Args[0])
if err != nil {
return "", fmt.Errorf("can't get absolute path for executable: %v", err)
}
path := filepath.Dir(serverFile)
realFile, err := filepath.EvalSymlinks(serverFile)
if err != nil {
if _, err = os.Stat(serverFile + ".exe"); err == nil {
realFile = filepath.Clean(serverFile + ".exe")
}
}
if err == nil && realFile != serverFile {
path = filepath.Dir(realFile)
}
return path, nil
}
// SymbolicWalk is like filepath.Walk, but it supports the root being a
// symbolic link. It will still not follow symbolic links deeper down in
// the file structure.
func SymbolicWalk(fs afero.Fs, root string, walker filepath.WalkFunc) error {
// Sanity check
if root != "" && len(root) < 4 {
return errors.New("path is too short")
}
// Handle the root first
fileInfo, realPath, err := getRealFileInfo(fs, root)
if err != nil {
return walker(root, nil, err)
}
if !fileInfo.IsDir() {
return fmt.Errorf("cannot walk regular file %s", root)
}
if err := walker(realPath, fileInfo, err); err != nil && err != filepath.SkipDir {
return err
}
// Some of Hugo's filesystems represents an ordered root folder, i.e. project first, then theme folders.
// Make sure that order is preserved. afero.Walk will sort the directories down in the file tree,
// but we don't care about that.
rootContent, err := readDir(fs, root, false)
if err != nil {
return walker(root, nil, err)
}
for _, fi := range rootContent {
if err := afero.Walk(fs, filepath.Join(root, fi.Name()), walker); err != nil {
return err
}
}
return nil
}
func readDir(fs afero.Fs, dirname string, doSort bool) ([]os.FileInfo, error) {
f, err := fs.Open(dirname)
if err != nil {
return nil, err
}
list, err := f.Readdir(-1)
f.Close()
if err != nil {
return nil, err
}
if doSort {
sort.Slice(list, func(i, j int) bool { return list[i].Name() < list[j].Name() })
}
return list, nil
}
func getRealFileInfo(fs afero.Fs, path string) (os.FileInfo, string, error) {
fileInfo, err := LstatIfPossible(fs, path)
realPath := path
if err != nil {
return nil, "", err
}
if fileInfo.Mode()&os.ModeSymlink == os.ModeSymlink {
link, err := filepath.EvalSymlinks(path)
if err != nil {
return nil, "", _errors.Wrapf(err, "Cannot read symbolic link %q", path)
}
fileInfo, err = LstatIfPossible(fs, link)
if err != nil {
return nil, "", _errors.Wrapf(err, "Cannot stat %q", link)
}
realPath = link
}
return fileInfo, realPath, nil
}
// GetRealPath returns the real file path for the given path, whether it is a
// symlink or not.
func GetRealPath(fs afero.Fs, path string) (string, error) {
_, realPath, err := getRealFileInfo(fs, path)
if err != nil {
return "", err
}
return realPath, nil
}
// LstatIfPossible can be used to call Lstat if possible, else Stat.
func LstatIfPossible(fs afero.Fs, path string) (os.FileInfo, error) {
if lstater, ok := fs.(afero.Lstater); ok {
fi, _, err := lstater.LstatIfPossible(path)
return fi, err
}
return fs.Stat(path)
}
// SafeWriteToDisk is the same as WriteToDisk
// but it also checks to see if file/directory already exists.
func SafeWriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error) {
return afero.SafeWriteReader(fs, inpath, r)
}
// WriteToDisk writes content to disk.
func WriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error) {
return afero.WriteReader(fs, inpath, r)
}
// OpenFilesForWriting opens all the given filenames for writing.
func OpenFilesForWriting(fs afero.Fs, filenames ...string) (io.WriteCloser, error) {
var writeClosers []io.WriteCloser
for _, filename := range filenames {
f, err := OpenFileForWriting(fs, filename)
if err != nil {
for _, wc := range writeClosers {
wc.Close()
}
return nil, err
}
writeClosers = append(writeClosers, f)
}
return hugio.NewMultiWriteCloser(writeClosers...), nil
}
// OpenFileForWriting opens or creates the given file. If the target directory
// does not exist, it gets created.
func OpenFileForWriting(fs afero.Fs, filename string) (afero.File, error) {
filename = filepath.Clean(filename)
// Create will truncate if file already exists.
// os.Create will create any new files with mode 0666 (before umask).
f, err := fs.Create(filename)
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
if err = fs.MkdirAll(filepath.Dir(filename), 0777); err != nil { // before umask
return nil, err
}
f, err = fs.Create(filename)
}
return f, err
}
// GetCacheDir returns a cache dir from the given filesystem and config.
// The dir will be created if it does not exist.
func GetCacheDir(fs afero.Fs, cfg config.Provider) (string, error) {
cacheDir := getCacheDir(cfg)
if cacheDir != "" {
exists, err := DirExists(cacheDir, fs)
if err != nil {
return "", err
}
if !exists {
err := fs.MkdirAll(cacheDir, 0777) // Before umask
if err != nil {
return "", _errors.Wrap(err, "failed to create cache dir")
}
}
return cacheDir, nil
}
// Fall back to a cache in /tmp.
return GetTempDir("hugo_cache", fs), nil
}
func getCacheDir(cfg config.Provider) string {
// Always use the cacheDir config if set.
cacheDir := cfg.GetString("cacheDir")
if len(cacheDir) > 1 {
return addTrailingFileSeparator(cacheDir)
}
// Both of these are fairly distinctive OS env keys used by Netlify.
if os.Getenv("DEPLOY_PRIME_URL") != "" && os.Getenv("PULL_REQUEST") != "" {
// Netlify's cache behaviour is not documented, the currently best example
// is this project:
// https://github.com/philhawksworth/content-shards/blob/master/gulpfile.js
return "/opt/build/cache/hugo_cache/"
}
// This will fall back to an hugo_cache folder in the tmp dir, which should work fine for most CI
// providers. See this for a working CircleCI setup:
// https://github.com/bep/hugo-sass-test/blob/6c3960a8f4b90e8938228688bc49bdcdd6b2d99e/.circleci/config.yml
// If not, they can set the HUGO_CACHEDIR environment variable or cacheDir config key.
return ""
}
func addTrailingFileSeparator(s string) string {
if !strings.HasSuffix(s, FilePathSeparator) {
s = s + FilePathSeparator
}
return s
}
// GetTempDir returns a temporary directory with the given sub path.
func GetTempDir(subPath string, fs afero.Fs) string {
return afero.GetTempDir(fs, subPath)
}
// DirExists checks if a path exists and is a directory.
func DirExists(path string, fs afero.Fs) (bool, error) {
return afero.DirExists(fs, path)
}
// IsDir checks if a given path is a directory.
func IsDir(path string, fs afero.Fs) (bool, error) {
return afero.IsDir(fs, path)
}
// IsEmpty checks if a given path is empty.
func IsEmpty(path string, fs afero.Fs) (bool, error) {
return afero.IsEmpty(fs, path)
}
// FileContains checks if a file contains a specified string.
func FileContains(filename string, subslice []byte, fs afero.Fs) (bool, error) {
return afero.FileContainsBytes(fs, filename, subslice)
}
// FileContainsAny checks if a file contains any of the specified strings.
func FileContainsAny(filename string, subslices [][]byte, fs afero.Fs) (bool, error) {
return afero.FileContainsAnyBytes(fs, filename, subslices)
}
// Exists checks if a file or directory exists.
func Exists(path string, fs afero.Fs) (bool, error) {
return afero.Exists(fs, path)
}