hugo/helpers/path.go

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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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"
"github.com/spf13/afero"
"github.com/spf13/viper"
"io"
"os"
"path/filepath"
"regexp"
"strings"
"unicode"
)
var sanitizeRegexp = regexp.MustCompile("[^a-zA-Z0-9./_-]")
// 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 MakePath(s string) string {
return UnicodeSanitize(strings.Replace(strings.TrimSpace(s), " ", "-", -1))
}
// MakePathToLower creates a Unicode-sanitized string, with the spaces replaced,
// and transformed to lower case.
// E.g. Social Media -> social-media
func MakePathToLower(s string) string {
return strings.ToLower(MakePath(s))
}
func MakeTitle(inpath string) string {
return strings.Replace(strings.TrimSpace(inpath), "-", " ", -1)
}
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) || r == '.' || r == '/' || r == '_' || r == '-' {
target = append(target, r)
}
}
return string(target)
}
// 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)
return f + "." + newExt
}
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// DirExists checks if a path exists and is a directory.
func DirExists(path string, fs afero.Fs) (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
}
// IsDir checks if a given path is a directory.
func IsDir(path string, fs afero.Fs) (bool, error) {
fi, err := fs.Stat(path)
if err != nil {
return false, err
}
return fi.IsDir(), nil
}
// IsEmpty checks if a given path is empty.
func IsEmpty(path string, fs afero.Fs) (bool, error) {
if b, _ := Exists(path, fs); !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 := os.Open(path)
// FIX: Resource leak - f.close() should be called here by defer or is missed
// if the err != nil branch is taken.
defer f.Close()
if err != nil {
return false, err
}
list, err := f.Readdir(-1)
// f.Close() - see bug fix above
return len(list) == 0, nil
} else {
return fi.Size() == 0, nil
}
}
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// Check if a file or directory exists.
func Exists(path string, fs afero.Fs) (bool, error) {
_, err := fs.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
func AbsPathify(inPath string) string {
if filepath.IsAbs(inPath) {
return filepath.Clean(inPath)
}
return filepath.Clean(filepath.Join(viper.GetString("WorkingDir"), inPath))
}
func MakeStaticPathRelative(inPath string) (string, error) {
staticDir := AbsPathify(viper.GetString("StaticDir"))
themeStaticDir := AbsPathify("themes/"+viper.GetString("theme")) + "/static/"
return MakePathRelative(inPath, staticDir, themeStaticDir)
}
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")
}
// Filename takes a path, strips out the extension,
// and returns the name of the file.
func Filename(in string) (name string) {
name, _ = FileAndExt(in)
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) (name string, ext string) {
ext = filepath.Ext(in)
base := filepath.Base(in) // path.Base strips any trailing slash!
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return extractFilename(in, ext, base, FilePathSeparator), ext
}
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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
}
return name, nil
}
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// GuessSection returns the section given a source path.
// A section is the part between the root slash and the second slash
// or before the first slash.
func GuessSection(in string) string {
parts := strings.Split(in, FilePathSeparator)
// This will include an empty entry before and after paths with leading and trailing slashes
// eg... /sect/one/ -> ["", "sect", "one", ""]
// Needs to have at least a value and a slash
if len(parts) < 2 {
return ""
}
// If it doesn't have a leading slash and value and file or trailing slash, then return ""
if parts[0] == "" && len(parts) < 3 {
return ""
}
// strip leading slash
if parts[0] == "" {
parts = parts[1:]
}
// if first directory is "content", return second directory
if parts[0] == "content" {
if len(parts) > 2 {
return parts[1]
} else {
return ""
}
}
return parts[0]
}
func PathPrep(ugly bool, in string) string {
if ugly {
return Uglify(in)
} else {
return PrettifyPath(in)
}
}
// 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 {
if filepath.Ext(in) == "" {
// /section/name/ -> /section/name/index.html
if len(in) < 2 {
return FilePathSeparator
}
return filepath.Join(filepath.Clean(in), "index.html")
} else {
name, ext := FileAndExt(in)
if name == "index" {
// /section/name/index.html -> /section/name/index.html
return filepath.Clean(in)
} else {
// /section/name.html -> /section/name/index.html
return filepath.Join(filepath.Dir(in), name, "index"+ext)
}
}
}
// 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
}
// Same as WriteToDisk but checks to see if file/directory already exists.
func SafeWriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error) {
dir, _ := filepath.Split(inpath)
ospath := filepath.FromSlash(dir)
if ospath != "" {
err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
if err != nil {
return
}
}
exists, err := Exists(inpath, fs)
if err != nil {
return
}
if exists {
return fmt.Errorf("%v already exists", inpath)
}
file, err := fs.Create(inpath)
if err != nil {
return
}
defer file.Close()
_, err = io.Copy(file, r)
return
}
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// Writes content to disk.
func WriteToDisk(inpath string, r io.Reader, fs afero.Fs) (err error) {
dir, _ := filepath.Split(inpath)
ospath := filepath.FromSlash(dir)
if ospath != "" {
err = fs.MkdirAll(ospath, 0777) // rwx, rw, r
if err != nil {
if err != os.ErrExist {
panic(err)
}
}
}
file, err := fs.Create(inpath)
if err != nil {
return
}
defer file.Close()
_, err = io.Copy(file, r)
return
}