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fileutil.go
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fileutil.go
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package fileutil
import (
"embed"
"fmt"
"io"
"os"
"os/user"
"path/filepath"
"strings"
)
// FullExt returns all of path's extensions. For example, for "foo.csv.zip"
// it returns ".csv.zip", not just ".zip" as filepath.Ext from the standard
// library does.
func FullExt(path string) string {
fullExt := filepath.Ext(path)
fullName := strings.TrimSuffix(path, fullExt)
for {
ext := filepath.Ext(fullName)
if ext == "" {
break
}
fullExt = ext + fullExt
fullName = strings.TrimSuffix(path, fullExt)
}
return fullExt
}
// Stem returns the file name after removing directory and all extensions.
// Uses FullExt to strip extensions.
func Stem(path string) string {
return strings.TrimSuffix(filepath.Base(path), FullExt(path))
}
// CopyToTempFile pipes a reader to a temporary file. The caller must delete
// the temporary file when it's no longer needed.
func CopyToTempFile(r io.Reader, name, ext string) (string, int64, error) {
// The * in the pattern will be replaced by a random string
f, err := os.CreateTemp("", fmt.Sprintf("%s*%s", name, ext))
if err != nil {
return "", 0, fmt.Errorf("os.Create: %w", err)
}
written, err := io.Copy(f, r)
if err != nil {
f.Close()
os.Remove(f.Name())
return "", 0, err
}
f.Close()
return f.Name(), written, err
}
// CopyEmbedDir copies an embedded directory to the local file system.
func CopyEmbedDir(fs embed.FS, src, dst string) error {
// Get items in src
entries, err := fs.ReadDir(src)
if err != nil {
return err
}
// Create dst dir if not exists
err = os.MkdirAll(dst, os.ModePerm)
if err != nil {
return err
}
// Check dst is a directory
stat, err := os.Stat(dst)
if err != nil {
return err
}
if !stat.IsDir() {
return fmt.Errorf("destination '%s' is not a directory", dst)
}
// Copy items recursively
for _, entry := range entries {
entrySrc := filepath.Join(src, entry.Name())
entryDst := filepath.Join(dst, entry.Name())
// If it's a directory, recurse
if entry.IsDir() {
err := CopyEmbedDir(fs, entrySrc, entryDst)
if err != nil {
return err
}
continue
}
// It's a file, copy it
data, err := fs.ReadFile(entrySrc)
if err != nil {
return err
}
if err := os.WriteFile(entryDst, data, os.ModePerm); err != nil {
return err
}
}
return nil
}
// IsGlob reports whether path contains any of the magic characters
// recognized by path.Match.
func IsGlob(path string) bool {
for i := 0; i < len(path); i++ {
switch path[i] {
case '*', '?', '[', '\\', '{':
return true
}
}
return false
}
// ForceRemoveFiles deletes multiple files
// ignores path errors if any
func ForceRemoveFiles(paths []string) {
for _, path := range paths {
_ = os.Remove(path)
}
}
func ExpandHome(path string) (string, error) {
if path == "" || path[0] != '~' {
return path, nil
}
if len(path) > 1 && path[1] != '/' {
return path, nil
}
usr, err := user.Current()
if err != nil {
return "", err
}
if usr.HomeDir == "" {
return "", fmt.Errorf("cannot expand '~' in path %q because the current user doesn't have a home directory", path)
}
return filepath.Join(usr.HomeDir, path[1:]), nil
}
// OpenTempFileInDir opens a temp file in given dir
// If dir doesn't exist it creates full dir path (recursively if required)
func OpenTempFileInDir(dir, filePath string) (*os.File, error) {
// recursively create all directories
if err := os.MkdirAll(dir, 0o750); err != nil {
return nil, err
}
return os.CreateTemp(dir, fmt.Sprintf("%s*%s", Stem(filePath), FullExt(filePath)))
}