package utils import ( "fmt" "github.com/pkg/errors" "io" "io/fs" "os" "path/filepath" ) func FileExists(name string) (bool, error) { f, err := os.Stat(name) if err == nil { if !f.IsDir() { return true, nil } return false, fmt.Errorf("%s is a directory", name) } if errors.Is(err, os.ErrNotExist) { return false, nil } return false, err } func DirExists(name string) (bool, error) { f, err := os.Stat(name) if err == nil { if f.IsDir() { return true, nil } return false, fmt.Errorf("%s is a file", name) } if errors.Is(err, os.ErrNotExist) { return false, nil } return false, err } func CopyFile(sourceFilename string, destFilename string) error { exists, err := FileExists(sourceFilename) if err != nil { return err } if !exists { return fmt.Errorf("%s does not exist", sourceFilename) } source, err := os.Open(sourceFilename) if err != nil { return err } defer source.Close() destDir := filepath.Dir(destFilename) if err := os.MkdirAll(destDir, os.ModePerm); err != nil { return errors.Wrapf(err, "unable to create directory %s", destDir) } destination, err := os.Create(destFilename) if err != nil { return err } defer destination.Close() _, err = io.Copy(destination, source) return err } // patterns passed are an OR - any can be satisified and the file will be listed func ListFilesInDirectory(directory string, patterns []string) ([]string, []error) { var files []string exists, err := DirExists(directory) if err != nil { return files, []error{err} } if !exists { return files, []error{fmt.Errorf("directory %s does not exist", directory)} } var pathErrors []error _ = filepath.Walk(directory, func(path string, info fs.FileInfo, err error) error { if err != nil { pathErrors = append(pathErrors, err) } else if !info.IsDir() { for _, pattern := range patterns { if matched, err := filepath.Match(pattern, filepath.Base(path)); err != nil { pathErrors = append(pathErrors, err) } else if matched { files = append(files, path) } } } return nil }) return files, pathErrors }