func()

in internal/filesystem/filesystem.go [74:121]

• 41 lines of code
• 11 McCabe index (conditional complexity)

func (fs *fsystem) ChangeDocument(dh VersionedDocumentHandler, changes DocumentChanges) error {
	if len(changes) == 0 {
		return nil
	}

	isOpen, err := fs.isDocumentOpen(dh)
	if err != nil {
		return err
	}

	if !isOpen {
		return &DocumentNotOpenErr{dh}
	}

	f, err := fs.memFs.OpenFile(dh.FullPath(), os.O_RDWR, 0o700)
	if err != nil {
		return err
	}
	defer f.Close()

	var buf bytes.Buffer
	_, err = buf.ReadFrom(f)
	if err != nil {
		return err
	}

	for _, ch := range changes {
		err := fs.applyDocumentChange(&buf, ch)
		if err != nil {
			return err
		}
	}

	err = f.Truncate(0)
	if err != nil {
		return err
	}
	_, err = f.Seek(0, 0)
	if err != nil {
		return err
	}
	_, err = f.Write(buf.Bytes())
	if err != nil {
		return err
	}

	return fs.updateDocumentMetadataLines(dh, buf.Bytes())
}