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fs.go
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fs.go
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package fs
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"io/fs"
"os"
"path/filepath"
"runtime"
"strings"
"unsafe"
"github.com/leaanthony/slicer"
)
// RelativeToCwd returns an absolute path based on the cwd
// and the given relative path
func RelativeToCwd(relativePath string) (string, error) {
cwd, err := os.Getwd()
if err != nil {
return "", err
}
return filepath.Join(cwd, relativePath), nil
}
// Mkdir will create the given directory
func Mkdir(dirname string) error {
return os.Mkdir(dirname, 0o755)
}
// MkDirs creates the given nested directories.
// Returns error on failure
func MkDirs(fullPath string, mode ...os.FileMode) error {
var perms os.FileMode
perms = 0o755
if len(mode) == 1 {
perms = mode[0]
}
return os.MkdirAll(fullPath, perms)
}
// MoveFile attempts to move the source file to the target
// Target is a fully qualified path to a file *name*, not a
// directory
func MoveFile(source string, target string) error {
return os.Rename(source, target)
}
// DeleteFile will delete the given file
func DeleteFile(filename string) error {
return os.Remove(filename)
}
// CopyFile from source to target
func CopyFile(source string, target string) error {
s, err := os.Open(source)
if err != nil {
return err
}
defer s.Close()
d, err := os.Create(target)
if err != nil {
return err
}
if _, err := io.Copy(d, s); err != nil {
d.Close()
return err
}
return d.Close()
}
// DirExists - Returns true if the given path resolves to a directory on the filesystem
func DirExists(path string) bool {
fi, err := os.Lstat(path)
if err != nil {
return false
}
return fi.Mode().IsDir()
}
// FileExists returns a boolean value indicating whether
// the given file exists
func FileExists(path string) bool {
fi, err := os.Lstat(path)
if err != nil {
return false
}
return fi.Mode().IsRegular()
}
// Exists returns a boolean value indicating whether
// the given file exists
func Exists(path string) bool {
fi, err := os.Lstat(path)
if err != nil {
return false
}
mode := fi.Mode()
return mode.IsRegular() || mode.IsDir()
}
// RelativePath returns a qualified path created by joining the
// directory of the calling file and the given relative path.
//
// Example: RelativePath("..") in *this* file would give you '/path/to/wails2/v2/internal`
func RelativePath(relativepath string, optionalpaths ...string) string {
_, thisFile, _, _ := runtime.Caller(1)
localDir := filepath.Dir(thisFile)
// If we have optional paths, join them to the relativepath
if len(optionalpaths) > 0 {
paths := []string{relativepath}
paths = append(paths, optionalpaths...)
relativepath = filepath.Join(paths...)
}
result, err := filepath.Abs(filepath.Join(localDir, relativepath))
if err != nil {
// I'm allowing this for 1 reason only: It's fatal if the path
// supplied is wrong as it's only used internally in Wails. If we get
// that path wrong, we should know about it immediately. The other reason is
// that it cuts down a ton of unnecessary error handling.
panic(err)
}
return result
}
// MustLoadString attempts to load a string and will abort with a fatal message if
// something goes wrong
func MustLoadString(filename string) string {
data, err := os.ReadFile(filename)
if err != nil {
fmt.Printf("FATAL: Unable to load file '%s': %s\n", filename, err.Error())
os.Exit(1)
}
return *(*string)(unsafe.Pointer(&data))
}
// MD5File returns the md5sum of the given file
func MD5File(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", err
}
defer f.Close()
h := md5.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
}
// MustMD5File will call MD5File and abort the program on error
func MustMD5File(filename string) string {
result, err := MD5File(filename)
if err != nil {
println("FATAL: Unable to MD5Sum file:", err.Error())
os.Exit(1)
}
return result
}
// MustWriteString will attempt to write the given data to the given filename
// It will abort the program in the event of a failure
func MustWriteString(filename string, data string) {
err := os.WriteFile(filename, []byte(data), 0o755)
if err != nil {
fatal("Unable to write file", filename, ":", err.Error())
os.Exit(1)
}
}
// fatal will print the optional messages and die
func fatal(message ...string) {
if len(message) > 0 {
print("FATAL:")
for text := range message {
print(text)
}
}
os.Exit(1)
}
// GetSubdirectories returns a list of subdirectories for the given root directory
func GetSubdirectories(rootDir string) (*slicer.StringSlicer, error) {
var result slicer.StringSlicer
// Iterate root dir
err := filepath.Walk(rootDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
// If we have a directory, save it
if info.IsDir() {
result.Add(path)
}
return nil
})
return &result, err
}
func DirIsEmpty(dir string) (bool, error) {
// CREDIT: https://stackoverflow.com/a/30708914/8325411
f, err := os.Open(dir)
if err != nil {
return false, err
}
defer f.Close()
_, err = f.Readdirnames(1) // Or f.Readdir(1)
if err == io.EOF {
return true, nil
}
return false, err // Either not empty or error, suits both cases
}
// CopyDir recursively copies a directory tree, attempting to preserve permissions.
// Source directory must exist, destination directory must *not* exist.
// Symlinks are ignored and skipped.
// Credit: https://gist.github.com/r0l1/92462b38df26839a3ca324697c8cba04
func CopyDir(src string, dst string) (err error) {
src = filepath.Clean(src)
dst = filepath.Clean(dst)
si, err := os.Stat(src)
if err != nil {
return err
}
if !si.IsDir() {
return fmt.Errorf("source is not a directory")
}
_, err = os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return
}
if err == nil {
return fmt.Errorf("destination already exists")
}
err = MkDirs(dst)
if err != nil {
return
}
entries, err := os.ReadDir(src)
if err != nil {
return
}
for _, entry := range entries {
srcPath := filepath.Join(src, entry.Name())
dstPath := filepath.Join(dst, entry.Name())
if entry.IsDir() {
err = CopyDir(srcPath, dstPath)
if err != nil {
return
}
} else {
// Skip symlinks.
if entry.Type()&os.ModeSymlink != 0 {
continue
}
err = CopyFile(srcPath, dstPath)
if err != nil {
return
}
}
}
return
}
// SetPermissions recursively sets file permissions on a directory
func SetPermissions(dir string, perm os.FileMode) error {
return filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
return os.Chmod(path, perm)
})
}
// CopyDirExtended recursively copies a directory tree, attempting to preserve permissions.
// Source directory must exist, destination directory must *not* exist. It ignores any files or
// directories that are given through the ignore parameter.
// Symlinks are ignored and skipped.
// Credit: https://gist.github.com/r0l1/92462b38df26839a3ca324697c8cba04
func CopyDirExtended(src string, dst string, ignore []string) (err error) {
ignoreList := slicer.String(ignore)
src = filepath.Clean(src)
dst = filepath.Clean(dst)
si, err := os.Stat(src)
if err != nil {
return err
}
if !si.IsDir() {
return fmt.Errorf("source is not a directory")
}
_, err = os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return
}
if err == nil {
return fmt.Errorf("destination already exists")
}
err = MkDirs(dst)
if err != nil {
return
}
entries, err := os.ReadDir(src)
if err != nil {
return
}
for _, entry := range entries {
if ignoreList.Contains(entry.Name()) {
continue
}
srcPath := filepath.Join(src, entry.Name())
dstPath := filepath.Join(dst, entry.Name())
if entry.IsDir() {
err = CopyDir(srcPath, dstPath)
if err != nil {
return
}
} else {
// Skip symlinks.
if entry.Type()&os.ModeSymlink != 0 {
continue
}
err = CopyFile(srcPath, dstPath)
if err != nil {
return
}
}
}
return
}
func FindPathToFile(fsys fs.FS, file string) (string, error) {
stat, _ := fs.Stat(fsys, file)
if stat != nil {
return ".", nil
}
var indexFiles slicer.StringSlicer
err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if strings.HasSuffix(path, file) {
indexFiles.Add(path)
}
return nil
})
if err != nil {
return "", err
}
if indexFiles.Length() > 1 {
selected := indexFiles.AsSlice()[0]
for _, f := range indexFiles.AsSlice() {
if len(f) < len(selected) {
selected = f
}
}
path, _ := filepath.Split(selected)
return path, nil
}
if indexFiles.Length() > 0 {
path, _ := filepath.Split(indexFiles.AsSlice()[0])
return path, nil
}
return "", fmt.Errorf("%s: %w", file, os.ErrNotExist)
}
// FindFileInParents searches for a file in the current directory and all parent directories.
// Returns the absolute path to the file if found, otherwise an empty string
func FindFileInParents(path string, filename string) string {
// Check for bad paths
if _, err := os.Stat(path); err != nil {
return ""
}
var pathToFile string
for {
pathToFile = filepath.Join(path, filename)
if _, err := os.Stat(pathToFile); err == nil {
break
}
parent := filepath.Dir(path)
if parent == path {
return ""
}
path = parent
}
return pathToFile
}