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fsutil.go
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fsutil.go
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package godest
import (
"io"
"io/fs"
)
// Directories
func listDirectories(f fs.FS, filter func(path string) bool) ([]string, error) {
dirs := []string{}
err := fs.WalkDir(f, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if !d.IsDir() {
return nil
}
if filter == nil || filter(path) {
if path == "." {
dirs = append(dirs, "")
} else {
dirs = append(dirs, path)
}
}
return nil
})
if err != nil {
return nil, err
}
return dirs, nil
}
func listFiles(f fs.FS, filter func(path string) bool) ([]string, error) {
files := []string{}
err := fs.WalkDir(f, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
if filter == nil || filter(path) {
files = append(files, path)
}
return nil
})
if err != nil {
return nil, err
}
return files, nil
}
// File Reading
func readFile(filename string, f fs.FS) ([]byte, error) {
file, err := f.Open(filename)
if err != nil {
return nil, err
}
defer func() {
if cerr := file.Close(); cerr != nil && err == nil {
err = cerr
}
}()
data, err := io.ReadAll(file)
if err != nil {
return nil, err
}
return data, err
}
func readConcatenated(filenames []string, f fs.FS) ([]byte, error) {
var concatenated []byte
for _, name := range filenames {
data, err := readFile(name, f)
if err != nil {
return nil, err
}
concatenated = append(concatenated, data...)
}
return concatenated, nil
}