Copy support copy file to file or dir to dir.

FileFilterOption construct file filter `CopyOption`.

GetIOStreams returns IOStreams stored in the context if any if not found will return nil *IOStreams.

IsDir check if the given path is a dir.

IsExist check if the given path is existed.

IsFile check if the given path is a file.

MustGetIOStreams gets the IOStream from context or initiates a default using os.Stdin, os.Stout, os.Sterr.

WithIOStreams adds IOStreams into the context.

WriteFile write the content to the desired file.

Config configuration for copy operation.

CopyOption function for setting CopyConfig.