/
foreachfile.go
55 lines (47 loc) · 974 Bytes
/
foreachfile.go
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package util
import (
"io"
"os"
"github.com/pkg/errors"
)
// ForEachFile iterates over every file in the specified directory path,
// invoking fn for each identified file.
//
// If path is not a directory, ForEachFile will return an error.
//
// If fn returns an error, iteration will stop and ForEachFile will return
// that error.
func ForEachFile(path string, fn func(os.FileInfo) error) error {
const scanSize = 1024
dir, err := os.Open(path)
if err != nil {
return err
}
defer func() {
_ = dir.Close()
}()
// Assert that path is a directory.
switch st, err := dir.Stat(); {
case err != nil:
return err
case !st.IsDir():
return errors.New("not a directory")
}
eof := false
for !eof {
files, err := dir.Readdir(scanSize)
if err != nil {
if err != io.EOF {
return err
}
eof = true
}
// Invoke callback for each file.
for _, f := range files {
if err := fn(f); err != nil {
return err
}
}
}
return nil
}